Develop Reference

Hotkey with MouseKeyHook not catching event in C#

I'm building a word lookup application that runs in system tray and when you scan a block of a few words and then press a hotkey combination like Shift + C + V for example.
However, the problem is that when I test it on my personal machine, it works fine. But when through Tester's machine, it is not possible to catch the hotkey press event.
I'm using MouseKeyHook's library.
May everyone help you
Here is my code
enum KeyModifier
{
None = 0,
Alt = 1,
Control = 2,
Shift = 4
}
public Main()
{
System.Diagnostics.Process myProcess = System.Diagnostics.Process.GetCurrentProcess();
myProcess.PriorityClass = System.Diagnostics.ProcessPriorityClass.High;
InitializeComponent();
this.WindowState = FormWindowState.Minimized;
this.ShowInTaskbar = false;
notify.Visible = true;
this.FormBorderStyle = FormBorderStyle.None;
this.Padding = new Padding(borderSize);
this.panel1.BackColor = borderColor;
this.BackColor = borderColor;
if (File.Exists("hotkey.txt") == false)
{
string noidung = "Shift+F";
File.WriteAllText("hotkey.txt", noidung);
}
manage = new ManageDictionary();
conn = ConnectDB.Connect();
ctrl = new ControlData(m_Events, data, txtSearch);
ctrl.SubscribeGlobal();
resetHotKey();
}
public void resetConnection()
{
conn = ConnectDB.Connect();
}
public void resetHotKey()
{
string[] hot;
string key;
this.hotkey_Events = Hook.GlobalEvents();
if (File.Exists("hotkey.txt"))
{
hot = File.ReadAllLines("hotkey.txt");
key = hot[0];
}
else
{
key = "Shift+F";
}
var subhotkey = Combination.FromString(key);
Action action = () => {
string keyword = Clipboard.GetText().Trim();
if (keyword.Equals(""))
return;
try
{
conn.Open();
ArrayList re;
re = manage.findWord(conn, keyword);
if (re.Count == 0)
{
Dictionary a = new Dictionary(0, "Không tìm thấy kết quả", "", "", "", "");
re.Add(a);
Notification noti = new Notification(re, keyword);
Thread.Sleep(1000);
noti.Show();
}
else
{
Notification noti = new Notification(re, keyword);
Thread.Sleep(1000);
noti.Show();
}
}
catch (Exception)
{
MessageBox.Show("Kết nối thất bại");
}
conn.Close();
};
var assignment = new Dictionary<Combination, Action>
{
{subhotkey, action}
};
this.hotkey_Events.OnCombination(assignment);
}

Why has my code become recursive within form1?

I've been working on a bit of software in c# and it was going nicely but as of yesterday evening I noticed that it was throwing a memory exception error at the point when it loads an image.
I tried to decrease the image size but then realised that 'declaring rats' was being printed repeatedly to the console, where it should only occur once.
Digging a little deeper with some break points I found that it enters the drawing constructor at allRats = new Drawing(HousePicBox, DekuPicBox, BakuPicBox); //THIS HAS BECOME RECURSIVE, WTF
yet it doesn't seem to run the code within the constructor, but jumps back to the start of form1().
I have included all of the code within the files which the Program Counter touches.
//---------------------------------------------------FORM1.CS-------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
// This is the code for your desktop app.
// Press Ctrl+F5 (or go to Debug > Start Without Debugging) to run your app.
namespace XMLRats5
{
public partial class Form1 : Form
{
// These are here as they are referred to by various functions for different reasons
string MazakSourceURL = "http://mtconnect.mazakcorp.com:5609"; // Gives us a human friendly reference to the HTML
string NISTSourceURL = "https://smstestbed.nist.gov/vds/current"; // Gives us a human friendly reference to the HTML
public PollTimer statusPoller;
public static Drawing allRats;
ImageRat Deku;
ImageRat Bakugo;
NISTDataSet CurrentNIST;
MazakDataSet CurrentMazak;
public Form1()
{
Console.WriteLine("Declaring Rats..."); // Is being called recursively :( ?????????????
ImageRat.Deku = new Rat(false, 0, 0, true, 0); // Declares Deku
ImageRat.Bakugo = new Rat(false, 800, 0, true, 0); // Declares Bakugo
Console.WriteLine("Initialising");
InitializeComponent(); // Constructs the graphics which make up the 'state 0'
Console.WriteLine("Declaring image");
allRats = new Drawing(HousePicBox, DekuPicBox, BakuPicBox); //THIS HAS BECOME RECURSIVE, WTF
Console.WriteLine("Clearing Image");
allRats.ClearRats();
Console.WriteLine("Displaying House");
HousePicBox.Show();
//allRats.DrawRats(ImageRat.deku.Awake, ImageRat.bakugo.Awake);
Console.WriteLine("Form 1 Initiated, please proceed.");
}
private void NISTDataLinkLabel_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
// This link takes you to the 'current' NIST testbed data feed page
System.Diagnostics.Process.Start(NISTSourceURL);
}
private void MAZAKDataLinkLabel_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
// This link takes you to the raw XML published by Mazaks HCN6800 labelled 5609
System.Diagnostics.Process.Start(MazakSourceURL);
}
public void StatusCheckButton_Click(object sender, EventArgs e) // Here we should check that the machine tools are feeding live data
{
// Clear the rat picture boxes as they 'stick' when already shown
DekuPicBox.Hide();
BakuPicBox.Hide();
string MazakStatus = "Unchecked";
string NISTStatus = "Unchecked";
try
{
CurrentMazak = MTFunctions.PollMazak();
MazakStatus = CurrentMazak.Status;
if (MazakStatus == "AVAILABLE") { ImageRat.Deku.Awake = true; }
}
catch (Exception MazakLookupFailed)
{
Console.WriteLine("Could not retrieve Mazak Data", MazakLookupFailed);
MazakStatus = "Lookup Failed"; // This will later refer to the xml path for running status
}
try
{
CurrentNIST = MTFunctions.PollNIST();
NISTStatus = CurrentNIST.Status;
if (NISTStatus == "AVAILABLE") { ImageRat.Bakugo.Awake = true; }
}
catch (Exception NISTLookupFailed)
{
Console.WriteLine("Could not Retrieve NIST Data: ", NISTLookupFailed);
NISTStatus = "Lookup Failed";
ImageRat.Bakugo.Awake = false;
}
string MessageString = " Mazak : " + MazakStatus + "\n NIST : " + NISTStatus;
if ((ImageRat.Deku.Awake == true) & (ImageRat.Bakugo.Awake == true)) // Both Online
{
HousePicBox.Image = XMLRats5.Properties.Resources.bothsleep; // SLeeping rat shows machine online but not feeding data
} // Empty Box
if ((ImageRat.Deku.Awake == true) & (ImageRat.Bakugo.Awake == false)) // NIST offline
{
HousePicBox.Image = XMLRats5.Properties.Resources.bakusleep;
DekuPicBox.Show(); // Not neccessary but prevents bugs
} // Put Bakug in box, deku out
if ((ImageRat.Deku.Awake == false) & (ImageRat.Bakugo.Awake == true)) // Mazak Offline
{
HousePicBox.Image = XMLRats5.Properties.Resources.dekuSleep;
BakuPicBox.Show(); // Not neccessary but prevents bugs
} // Put deku in box, bakugo out
if ((ImageRat.Deku.Awake == false) & (ImageRat.Bakugo.Awake == false)) // Both Offline
{
HousePicBox.Image = XMLRats5.Properties.Resources.nosleep;
} // Put rats in box
MessageBox.Show(MessageString, "Machine Status"); // We need to pass information gained through XPath to first argument
}
public void WakeRatsButton_Click(object sender, EventArgs e)
{
MessageBox.Show("This 'wakes the rats' (Begins data stream)");
// We need to poll Mazak and NIST here to determine which images to draw.
MazakDataSet checkM = MTFunctions.PollMazak();
NISTDataSet checkN = MTFunctions.PollNIST();
if (checkM.Status == "AVAILABLE")
{
ImageRat.Deku.Awake = true;
DekuPicBox.Show();
}
else { ImageRat.Deku.Awake = false; }
if (checkN.Status == "AVAILABLE")
{
BakuPicBox.Show();
ImageRat.Bakugo.Awake = true;
}
else { ImageRat.Bakugo.Awake = false; }
allRats.DrawRats(ImageRat.Deku.Awake, ImageRat.Bakugo.Awake); // Should move the boys out of the box
// Here the draw function successfully relocates the rats, so why does this not work from the timer?
statusPoller = new PollTimer(2000, true); //Initiate a timer driven function which polls the data sets
// Timer Driven function draws rats
}
public void DebugInstructionsLabel_Click(object sender, EventArgs e)
{ }
public void titleLabel_Click(object sender, EventArgs e) { }
public void SleepRatsButton_Click(object sender, EventArgs e)
{
MessageBox.Show("This 'puts the rats to bed' (Closes data stream)");
try // Stop Polling timer function
{
statusPoller.Stop();
statusPoller.Dispose();
Console.Write("Stream closed successfully");
}
catch { Console.WriteLine("Could not stop polling. Were the rats actually 'awake'?"); }
// Draw rats in house
DekuPicBox.Hide(); // Rat is no longer active
BakuPicBox.Hide(); // Rat is no longer active
HousePicBox.Image = XMLRats5.Properties.Resources.nosleep; // Show empty box
//allRats.Paint();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void HousePicBox_Click(object sender, EventArgs e)
{
}
private void DekuPicBox_Click(object sender, EventArgs e)
{
// Proves that problem with movement is because DekuPicBox needs to be changed, not allRats.dekuPic....
System.Drawing.Point DekuCoord = new System.Drawing.Point(ImageRat.Deku.PosX, ImageRat.Deku.PosY); // Create a 'System Point' for Deku
DekuPicBox.Location = DekuCoord;
Console.WriteLine("~~~~~~~~Deku moved to " + DekuCoord + " ~~~~~~~~");
}
private void BakuPicBox_Click(object sender, EventArgs e)
{
System.Drawing.Point BakuCoord = new System.Drawing.Point(ImageRat.Bakugo.PosX, ImageRat.Bakugo.PosY); // Create a 'System Point' for Deku
BakuPicBox.Location = BakuCoord;
Console.WriteLine("~~~~~~~~Bakugo moved to " + BakuCoord + " ~~~~~~~~");
}
public void Refresh(int boi) // Better bloody relocate those pics boii
{
if (boi == 0)
{
System.Drawing.Point BakuCoord = new System.Drawing.Point(ImageRat.Bakugo.PosX, ImageRat.Bakugo.PosY); // Create a 'System Point' for Deku
DekuPicBox.Location = BakuCoord;
}
else
{
System.Drawing.Point DekuCoord = new System.Drawing.Point(ImageRat.Deku.PosX, ImageRat.Deku.PosY); // Create a 'System Point' for Deku
DekuPicBox.Location = DekuCoord;
}
}
}
}
//----------------------------------------------FORM1.Designer.CS--------------------------------------------------------
namespace XMLRats5
{
partial class Form1
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.MAZAKDataLinkLabel = new System.Windows.Forms.LinkLabel();
this.DebugInstructionsLabel = new System.Windows.Forms.Label();
this.StatusCheckButton = new System.Windows.Forms.Button();
this.TitleLabel = new System.Windows.Forms.Label();
this.WakeRatsButton = new System.Windows.Forms.Button();
this.SleepRatsButton = new System.Windows.Forms.Button();
this.NISTDataLinkLabel = new System.Windows.Forms.LinkLabel();
this.BakuPicBox = new System.Windows.Forms.PictureBox();
this.HousePicBox = new System.Windows.Forms.PictureBox();
this.DekuPicBox = new System.Windows.Forms.PictureBox();
((System.ComponentModel.ISupportInitialize)(this.BakuPicBox)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.HousePicBox)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.DekuPicBox)).BeginInit();
this.SuspendLayout();
//
// MAZAKDataLinkLabel
//
this.MAZAKDataLinkLabel.AutoSize = true;
this.MAZAKDataLinkLabel.Location = new System.Drawing.Point(1287, 985);
this.MAZAKDataLinkLabel.Margin = new System.Windows.Forms.Padding(4, 0, 4, 0);
this.MAZAKDataLinkLabel.Name = "MAZAKDataLinkLabel";
this.MAZAKDataLinkLabel.Size = new System.Drawing.Size(179, 25);
this.MAZAKDataLinkLabel.TabIndex = 0;
this.MAZAKDataLinkLabel.TabStop = true;
this.MAZAKDataLinkLabel.Text = "View Mazak Data";
this.MAZAKDataLinkLabel.LinkClicked += new System.Windows.Forms.LinkLabelLinkClickedEventHandler(this.MAZAKDataLinkLabel_LinkClicked);
//
// DebugInstructionsLabel
//
this.DebugInstructionsLabel.AutoSize = true;
this.DebugInstructionsLabel.Location = new System.Drawing.Point(1066, 524);
this.DebugInstructionsLabel.Margin = new System.Windows.Forms.Padding(4, 0, 4, 0);
this.DebugInstructionsLabel.Name = "DebugInstructionsLabel";
this.DebugInstructionsLabel.Size = new System.Drawing.Size(623, 50);
this.DebugInstructionsLabel.TabIndex = 1;
this.DebugInstructionsLabel.Text = "Press \'Check Machine\' to ensure a device is running, otherwise \n don\'t expect muc" +
"h activity from the rats!";
this.DebugInstructionsLabel.Click += new System.EventHandler(this.DebugInstructionsLabel_Click);
//
// StatusCheckButton
//
this.StatusCheckButton.Location = new System.Drawing.Point(1271, 658);
this.StatusCheckButton.Margin = new System.Windows.Forms.Padding(4);
this.StatusCheckButton.Name = "StatusCheckButton";
this.StatusCheckButton.Size = new System.Drawing.Size(195, 54);
this.StatusCheckButton.TabIndex = 2;
this.StatusCheckButton.Text = "Check Machine Status";
this.StatusCheckButton.UseVisualStyleBackColor = true;
this.StatusCheckButton.Click += new System.EventHandler(this.StatusCheckButton_Click);
//
// TitleLabel
//
this.TitleLabel.AutoSize = true;
this.TitleLabel.Font = new System.Drawing.Font("Microsoft Sans Serif", 16F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.TitleLabel.Location = new System.Drawing.Point(1255, 382);
this.TitleLabel.Margin = new System.Windows.Forms.Padding(4, 0, 4, 0);
this.TitleLabel.Name = "TitleLabel";
this.TitleLabel.Size = new System.Drawing.Size(211, 51);
this.TitleLabel.TabIndex = 3;
this.TitleLabel.Text = "XML Rats";
this.TitleLabel.Click += new System.EventHandler(this.titleLabel_Click);
//
// WakeRatsButton
//
this.WakeRatsButton.Location = new System.Drawing.Point(1271, 775);
this.WakeRatsButton.Margin = new System.Windows.Forms.Padding(4);
this.WakeRatsButton.Name = "WakeRatsButton";
this.WakeRatsButton.Size = new System.Drawing.Size(195, 54);
this.WakeRatsButton.TabIndex = 4;
this.WakeRatsButton.Text = "Wake Rats";
this.WakeRatsButton.UseVisualStyleBackColor = true;
//
// SleepRatsButton
//
this.SleepRatsButton.Location = new System.Drawing.Point(1271, 885);
this.SleepRatsButton.Margin = new System.Windows.Forms.Padding(4);
this.SleepRatsButton.Name = "SleepRatsButton";
this.SleepRatsButton.Size = new System.Drawing.Size(195, 54);
this.SleepRatsButton.TabIndex = 5;
this.SleepRatsButton.Text = "Sleep Rats";
this.SleepRatsButton.UseVisualStyleBackColor = true;
//
// NISTDataLinkLabel
//
this.NISTDataLinkLabel.AutoSize = true;
this.NISTDataLinkLabel.Location = new System.Drawing.Point(1287, 1054);
this.NISTDataLinkLabel.Margin = new System.Windows.Forms.Padding(4, 0, 4, 0);
this.NISTDataLinkLabel.Name = "NISTDataLinkLabel";
this.NISTDataLinkLabel.Size = new System.Drawing.Size(162, 25);
this.NISTDataLinkLabel.TabIndex = 6;
this.NISTDataLinkLabel.TabStop = true;
this.NISTDataLinkLabel.Text = "View NIST Data";
//
// BakuPicBox
//
this.BakuPicBox.Image = global::XMLRats5.Properties.Resources.bakuTransSmall;
this.BakuPicBox.Location = new System.Drawing.Point(2092, 1388);
this.BakuPicBox.Name = "BakuPicBox";
this.BakuPicBox.Size = new System.Drawing.Size(632, 424);
this.BakuPicBox.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
this.BakuPicBox.TabIndex = 9;
this.BakuPicBox.TabStop = false;
//
// HousePicBox
//
this.HousePicBox.Image = global::XMLRats5.Properties.Resources.nosleep;
this.HousePicBox.Location = new System.Drawing.Point(1057, 1388);
this.HousePicBox.Name = "HousePicBox";
this.HousePicBox.Size = new System.Drawing.Size(632, 424);
this.HousePicBox.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
this.HousePicBox.TabIndex = 8;
this.HousePicBox.TabStop = false;
//
// DekuPicBox
//
this.DekuPicBox.Image = global::XMLRats5.Properties.Resources.DekuBackgroundTransparent;
this.DekuPicBox.Location = new System.Drawing.Point(12, 1388);
this.DekuPicBox.Name = "DekuPicBox";
this.DekuPicBox.Size = new System.Drawing.Size(632, 424);
this.DekuPicBox.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
this.DekuPicBox.TabIndex = 7;
this.DekuPicBox.TabStop = false;
this.DekuPicBox.Click += new System.EventHandler(this.DekuPicBox_Click);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(12F, 25F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(2736, 1824);
this.Controls.Add(this.BakuPicBox);
this.Controls.Add(this.HousePicBox);
this.Controls.Add(this.DekuPicBox);
this.Controls.Add(this.NISTDataLinkLabel);
this.Controls.Add(this.SleepRatsButton);
this.Controls.Add(this.WakeRatsButton);
this.Controls.Add(this.TitleLabel);
this.Controls.Add(this.StatusCheckButton);
this.Controls.Add(this.DebugInstructionsLabel);
this.Controls.Add(this.MAZAKDataLinkLabel);
this.Margin = new System.Windows.Forms.Padding(4);
this.Name = "Form1";
this.Text = "Form1";
((System.ComponentModel.ISupportInitialize)(this.BakuPicBox)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.HousePicBox)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.DekuPicBox)).EndInit();
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.LinkLabel MAZAKDataLinkLabel;
private System.Windows.Forms.Label DebugInstructionsLabel;
private System.Windows.Forms.Button StatusCheckButton;
private System.Windows.Forms.Label TitleLabel;
private System.Windows.Forms.Button WakeRatsButton;
private System.Windows.Forms.Button SleepRatsButton;
private System.Windows.Forms.LinkLabel NISTDataLinkLabel;
public System.Windows.Forms.PictureBox DekuPicBox;
public System.Windows.Forms.PictureBox HousePicBox;
public System.Windows.Forms.PictureBox BakuPicBox;
}
}
//-------------------------------------------------------------DRAWING.CS----------------------------
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Reflection;
using System.Drawing;
using System.Windows.Forms;
namespace XMLRats5
{
public class Drawing : Form1
{
private PictureBox HouseImage;
private PictureBox DekuImage;
private PictureBox BakuImage;
public Drawing(PictureBox house, PictureBox deku, PictureBox baku)
{
HouseImage = house;
DekuImage = deku;
BakuImage = baku;
} // Code is jumping back to form1 call :S
public void ClearRats()
{
//DekuImage.Image.Dispose();
//BakuImage.Image.Dispose();
//HouseImage.Image.Dispose();
HouseImage.Hide();
DekuImage.Hide();
BakuImage.Hide();
}
public void RePaint()
{
//BakuImage.Paint();
//DekuImage.Paint();
//HouseImage.Paint();
}
public void DrawRats(bool DekuWake, bool BakuWake) // Call this function using active status of 2 machines
{
this.ClearRats();
DekuPicBox.SuspendLayout();
BakuPicBox.SuspendLayout();
HousePicBox.SuspendLayout();
System.Drawing.Point DekuCoord = new System.Drawing.Point(ImageRat.Deku.PosX, ImageRat.Deku.PosY); // Create a 'System Point' for Deku
System.Drawing.Point BakuCoord = new System.Drawing.Point(ImageRat.Bakugo.PosX, ImageRat.Bakugo.PosY); // Create a 'System Point' for Bakugo
Console.WriteLine("Randomly Generated Point Assigned (Deku):" + DekuCoord);
Console.WriteLine("Randomly Generated Point Assigned (Baku):" + BakuCoord);
if (DekuWake == false)
{
DekuImage.Hide();
if (BakuWake == false)
{
BakuPicBox.Hide();
HousePicBox.Image = XMLRats5.Properties.Resources.bothsleep;// set HouseImage to both sleep
}
else
{
BakuPicBox.Location = BakuCoord;
BakuPicBox.Show();
HousePicBox.Image = XMLRats5.Properties.Resources.dekuSleep; //Set HouseImage to DekuSleep
}
}
else //DekuWake == true
{
DekuImage.Show();
if (BakuWake == true)
{
HousePicBox.Image = XMLRats5.Properties.Resources.nosleep;//Set House image to nosleep
DekuPicBox.Location = DekuCoord;
DekuPicBox.Show();
BakuPicBox.Location = BakuCoord;
BakuPicBox.Show();
}
else
{
BakuPicBox.Hide();
HousePicBox.Image = XMLRats5.Properties.Resources.bakusleep;// Set house image to bakusleep
DekuPicBox.Location = DekuCoord;
DekuPicBox.Show();
}
}
HousePicBox.Show(); // Out here as it should always happen
}
}
}
Honestly I'm baffled as to why it keeps jumping back to the start of form1.
What have I broken?

As Drawing is derived from Form1 & you create an instance of Drawing in the Form1 constructor - this is going to cause the Form1 constructor to be invoked again which causes the creation of another instance of Drawing which causes ........... -
Note the base class constructor is called before the code in the derived class constructor - which is why you don't get to the code in the Drawing constructor.

how to release thread is required in multiple thread?

As title, how to release thread is required in multiple thread ?
Ex : I have 5 thread is waiting. I only want thread position 3 is released
I use autoresetevent/manualresetevent/monitor.wait and monitor.pulse but all release thread follow FIFO
help me !!!
UPDATED:
This is form1:
private BackgroundWorker[] threadArray;
public static ManualResetEvent _manualResetEvent = new ManualResetEvent(false);
private void btn_Start_Scraping_Click(object sender, EventArgs e)
{
threadArray = new BackgroundWorker[listView_Site.Items.Count];
for (var f = 0; f < listView_Site.Items.Count; f++)
{
threadArray[f] = new BackgroundWorker();
threadArray[f].DoWork += new DoWorkEventHandler(BackgroundWorkerFilesDoWork);
threadArray[f].RunWorkerCompleted += new RunWorkerCompletedEventHandler(BackgroundWorkerFilesRunWorkerCompleted);
threadArray[f].ProgressChanged += new ProgressChangedEventHandler(BackgroundWorkerFilesProgressChanged);
threadArray[f].WorkerReportsProgress = true;
threadArray[f].WorkerSupportsCancellation = true;
threadArray[f].RunWorkerAsync(listView_Site.Items[f].Tag.ToString());
}
}
private void BackgroundWorkerFilesDoWork(object sender, DoWorkEventArgs e)
{
....// all above code is fine
requestCaptcha = (HttpWebRequest)WebRequest.Create(uriCaptchaPage);
requestCaptcha.Pipelined = true;
requestCaptcha.KeepAlive = true;
requestCaptcha.AllowAutoRedirect = false;
//request.Proxy = null;
requestCaptcha.Timeout = 60000;
requestCaptcha.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip,deflate");
requestCaptcha.CookieContainer = sessionID;
request.ServicePoint.Expect100Continue = false;
requestCaptcha.Method = "GET";
requestCaptcha.Referer = uriloginPage.AbsoluteUri;
//get response.
responseCaptcha = (HttpWebResponse)requestCaptcha.GetResponse();
Stream imagestream = responseCaptcha.GetResponseStream();
if (imagestream != null)
{
Image image = Image.FromStream(imagestream);
if (Directory.Exists(Application.StartupPath + "\\Captcha") == false)
{
Directory.CreateDirectory(Application.StartupPath + "\\Captcha");
}
switch (responseCaptcha.ContentType)
{
case "image/jpeg":
{
saveLocation += ".jpg";
if (File.Exists(saveLocation))
{
File.Delete(saveLocation);
}
image.Save(saveLocation,ImageFormat.Jpeg);
break;
}
case "image/gif":
{
saveLocation += ".gif";
if (File.Exists(saveLocation))
{
File.Delete(saveLocation);
}
image.Save(saveLocation, ImageFormat.Gif);
break;
}
case "image/png":
{
saveLocation += ".png";
if (File.Exists(saveLocation))
{
File.Delete(saveLocation);
}
image.Save(saveLocation, ImageFormat.Png);
break;
}
}
//show form2 to enter captcha
lock (_lockObj)
{
if (Application.OpenForms.OfType<frmCaptchaQuestion>().Any() == false)
{
DoOnUIThread(delegate()
{
_formCaptchaQuestion.CreatePanelCaptcha(uriloginPage, saveLocation,idHomePage);
_formCaptchaQuestion.Show();
});
}
else
{
DoOnUIThread(() => _formCaptchaQuestion.CreatePanelCaptcha(uriloginPage, saveLocation,idHomePage));
}
}
//wait and get captcha from form2 and only run thread is required
//this is my problem <<<<========================================
lock (_lockObj)
{
//_manualResetEvent.WaitOne(30000);
//_manualResetEvent.Reset();
//if (clsValueStatic.CaptchaText != null)
//{
// foreach (var id in clsValueStatic.CaptchaText)
// {
while (!_go)
{
Monitor.Wait(_lockObj);
}
// }
//}
}
requestCaptcha = (HttpWebRequest)WebRequest.Create(uriActionLoginPage);
requestCaptcha.Pipelined = true;
requestCaptcha.KeepAlive = true;
requestCaptcha.AllowAutoRedirect = false;
//request.Proxy = null;
requestCaptcha.Timeout = 60000;
requestCaptcha.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip,deflate");
requestCaptcha.CookieContainer = sessionID;
request.ServicePoint.Expect100Continue = false;
requestCaptcha.Method = "GET";
}
Form2:
private void textBoxCaptcha_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
var textBox = sender as TextBoxX;
if (textBox != null)
{
clsValueStatic.CaptchaText = textBox.Text.Trim();
textBox.Parent.Parent.Dispose();
frmScrapingAnalysis._manualResetEvent.Set();
}
}
}
PS : Form1 have 1 button to start multiple backgroundworker and show form2 then all backgroundworker wait to get text captcha of textbox from form2
my way want when user enter text of backgroundworker is shown on form2 then only the backgroundworker is released. All other backgroundworker still wait

video conference application

Hay i am new in media and quite new for C# i am trying for a video conference application, i have almost done it but my problem is a dll of windows actually i am using window 8.1 and i am trying to use avicap32.dll to open and close my webcam but its not working well it start webcam only once after booting then after until i don't restart my computer it always shows a black screen i am attaching my code too for reference. Thanks in advance.
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;
using System.Drawing.Imaging;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.IO;
using DirectX.Capture;
using DShowNET;
namespace Video_Conference
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.SaveFileDialog saveFileDialog1;
internal PictureBox picture_comming;
private TextBox IP_textBox;
private Label label1;
private TextBox device_number_textBox;
private Label label2;
private Button button1;
private Button button2;
private System.Windows.Forms.Timer timer1;
#region WebCam API
const short WM_CAP = 1024;
const int WM_CAP_DRIVER_CONNECT = WM_CAP + 10;
const int WM_CAP_DRIVER_DISCONNECT = WM_CAP + 11;
const int WM_CAP_EDIT_COPY = WM_CAP + 30;
const int WM_CAP_SET_PREVIEW = WM_CAP + 50;
const int WM_CAP_SET_PREVIEWRATE = WM_CAP + 52;
const int WM_CAP_SET_SCALE = WM_CAP + 53;
const int WS_CHILD = 1073741824;
const int WS_VISIBLE = 268435456;
const short SWP_NOMOVE = 2;
const short SWP_NOSIZE = 1;
const short SWP_NOZORDER = 4;
const short HWND_BOTTOM = 1;
int iDevice = 0;
Capture capture = null;
Filters filters = null;
int counter = 1;
int hHwnd;
[System.Runtime.InteropServices.DllImport("user32", EntryPoint="SendMessageA")]
static extern int SendMessage(int hwnd, int wMsg, int wParam, [MarshalAs(UnmanagedType.AsAny)] object lParam);
[System.Runtime.InteropServices.DllImport("user32", EntryPoint="SetWindowPos")]
static extern int SetWindowPos(int hwnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags);
[System.Runtime.InteropServices.DllImport("user32")]
static extern bool DestroyWindow(int hndw);
[System.Runtime.InteropServices.DllImport("avicap32.dll")]
static extern int capCreateCaptureWindowA(string lpszWindowName, int dwStyle, int x, int y, int nWidth, short nHeight, int hWndParent, int nID);
[System.Runtime.InteropServices.DllImport("avicap32.dll")]
static extern bool capGetDriverDescriptionA(short wDriver, string lpszName, int cbName, string lpszVer, int cbVer);
private void OpenPreviewWindow()
{
int iHeight = 320;
int iWidth = 200;
//
// Open Preview window in picturebox
////
hHwnd = capCreateCaptureWindowA(iDevice.ToString(), (WS_VISIBLE | WS_CHILD), 0, 0, 640, 480, picCapture.Handle.ToInt32(), 0);
////hHwnd = 132190;
////
//// Connect to device
////
if (SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, iDevice, 0) == 1)
{
// //
// // Set the preview scale
// //
SendMessage(hHwnd, WM_CAP_SET_SCALE, 1, 0);
// //
// // Set the preview rate in milliseconds
// //
/ SendMessage(hHwnd, WM_CAP_SET_PREVIEWRATE, 66, 0);
// //
// Start previewing the image from the camera
// //
SendMessage(hHwnd, WM_CAP_SET_PREVIEW, 1, 0);
// //
// // Resize window to fit in picturebox
// //
SetWindowPos(hHwnd, HWND_BOTTOM, 0, 0, iWidth,iHeight, (SWP_NOMOVE | SWP_NOZORDER));
}
else
{
// //
// // Error connecting to device close window
// //
DestroyWindow(hHwnd);
}
}
void startOrStopCapturing(Capture capture)
{
btnStart.Visible = false;
if (capture != null) capture.Stop();
if (timer1.Enabled) timer1.Stop();
if (btnStart.Text == "START")
{
btnStart.Text = "STOP";
btnStart.BackColor = Color.Maroon;
try
{
if (!capture.Cued) capture.Filename = counter + ".wmv";
capture.Cue();
capture.Start();
timer1.Start();
}
catch (Exception ex)
{
MessageBox.Show("Error Message: \n\n" + ex.Message);
}
}
else
{
btnStart.Text = "START";
btnStart.BackColor = Color.DarkSlateBlue;
}
btnStart.Visible = true;
}
void preview(int deviceNo)
{
try
{
capture = new Capture(filters.VideoInputDevices[deviceNo], filters.AudioInputDevices[0]);
capture.PreviewWindow = picCapture;
if (btnStart.Text == "STOP")
{
counter++;
if (!capture.Cued) capture.Filename = counter + ".wmv";
capture.Cue();
}
capture.Start();
}
catch { }
}
private void ClosePreviewWindow()
{
//
// Disconnect from device
//
SendMessage(hHwnd, WM_CAP_DRIVER_DISCONNECT, iDevice, 0);
//
// close window
//
DestroyWindow(hHwnd);
}
#endregion
internal System.Windows.Forms.Button btnStop;
internal System.Windows.Forms.Button btnStart;
internal System.Windows.Forms.PictureBox picCapture;
private IContainer components;
public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.btnStop = new System.Windows.Forms.Button();
this.btnStart = new System.Windows.Forms.Button();
this.saveFileDialog1 = new System.Windows.Forms.SaveFileDialog();
this.IP_textBox = new System.Windows.Forms.TextBox();
this.label1 = new System.Windows.Forms.Label();
this.device_number_textBox = new System.Windows.Forms.TextBox();
this.label2 = new System.Windows.Forms.Label();
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.timer1 = new System.Windows.Forms.Timer(this.components);
this.picture_comming = new System.Windows.Forms.PictureBox();
this.picCapture = new System.Windows.Forms.PictureBox();
((System.ComponentModel.ISupportInitialize)(this.picture_comming)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.picCapture)).BeginInit();
this.SuspendLayout();
//
// btnStop
//
this.btnStop.Anchor = System.Windows.Forms.AnchorStyles.None;
this.btnStop.FlatStyle = System.Windows.Forms.FlatStyle.System;
this.btnStop.Location = new System.Drawing.Point(123, 56);
this.btnStop.Name = "btnStop";
this.btnStop.Size = new System.Drawing.Size(112, 32);
this.btnStop.TabIndex = 11;
this.btnStop.Text = "Stop Capturing";
this.btnStop.Click += new System.EventHandler(this.btnStop_Click);
//
// btnStart
//
this.btnStart.Anchor = System.Windows.Forms.AnchorStyles.None;
this.btnStart.FlatStyle = System.Windows.Forms.FlatStyle.System;
this.btnStart.Location = new System.Drawing.Point(123, 18);
this.btnStart.Name = "btnStart";
this.btnStart.Size = new System.Drawing.Size(112, 32);
this.btnStart.TabIndex = 9;
this.btnStart.Text = "Start Capturing";
this.btnStart.Click += new System.EventHandler(this.btnStart_Click);
//
// IP_textBox
//
this.IP_textBox.Location = new System.Drawing.Point(69, 303);
this.IP_textBox.Name = "IP_textBox";
this.IP_textBox.Size = new System.Drawing.Size(161, 20);
this.IP_textBox.TabIndex = 13;
this.IP_textBox.Text = "127.0.0.1";
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(12, 306);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(51, 13);
this.label1.TabIndex = 14;
this.label1.Text = "Remot IP";
//
// device_number_textBox
//
this.device_number_textBox.Location = new System.Drawing.Point(336, 25);
this.device_number_textBox.Name = "device_number_textBox";
this.device_number_textBox.Size = new System.Drawing.Size(48, 20);
this.device_number_textBox.TabIndex = 15;
this.device_number_textBox.Text = "0";
//
// label2
//
this.label2.AutoSize = true;
this.label2.Location = new System.Drawing.Point(238, 28);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(91, 13);
this.label2.TabIndex = 16;
this.label2.Text = "Capture Device #";
//
// button1
//
this.button1.FlatStyle = System.Windows.Forms.FlatStyle.System;
this.button1.Location = new System.Drawing.Point(336, 300);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(75, 23);
this.button1.TabIndex = 17;
this.button1.Text = "Listener";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// button2
//
this.button2.FlatStyle = System.Windows.Forms.FlatStyle.System;
this.button2.Location = new System.Drawing.Point(239, 301);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(91, 23);
this.button2.TabIndex = 18;
this.button2.Text = "Start Sending";
this.button2.UseVisualStyleBackColor = true;
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// timer1
//
this.timer1.Interval = 1000;
this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
//
// picture_comming
//
this.picture_comming.Anchor = System.Windows.Forms.AnchorStyles.None;
this.picture_comming.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.picture_comming.Image = global::Video_Conference.Properties.Resources.ip;
this.picture_comming.Location = new System.Drawing.Point(15, 104);
this.picture_comming.Name = "picture_comming";
this.picture_comming.Size = new System.Drawing.Size(246, 189);
this.picture_comming.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
this.picture_comming.TabIndex = 12;
this.picture_comming.TabStop = false;
//
// picCapture
//
this.picCapture.Anchor = System.Windows.Forms.AnchorStyles.None;
this.picCapture.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.picCapture.Image = global::Video_Conference.Properties.Resources.icony;
this.picCapture.Location = new System.Drawing.Point(15, 18);
this.picCapture.Name = "picCapture";
this.picCapture.Size = new System.Drawing.Size(102, 80);
this.picCapture.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
this.picCapture.TabIndex = 6;
this.picCapture.TabStop = false;
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(414, 338);
this.Controls.Add(this.button2);
this.Controls.Add(this.button1);
this.Controls.Add(this.label2);
this.Controls.Add(this.device_number_textBox);
this.Controls.Add(this.label1);
this.Controls.Add(this.IP_textBox);
this.Controls.Add(this.picture_comming);
this.Controls.Add(this.btnStop);
this.Controls.Add(this.btnStart);
this.Controls.Add(this.picCapture);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
this.MaximizeBox = false;
this.Name = "Form1";
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "Video Conference - Peer 1 - www.fadidotnet.org";
this.Closing += new System.ComponentModel.CancelEventHandler(this.Form1_Closing);
this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.Form1_FormClosing);
this.Load += new System.EventHandler(this.Form1_Load);
((System.ComponentModel.ISupportInitialize)(this.picture_comming)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.picCapture)).EndInit();
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
TcpClient myclient;
MemoryStream ms;
NetworkStream myns;
BinaryWriter mysw;
Thread myth;
TcpListener mytcpl;
Socket mysocket;
NetworkStream ns;
private void Start_Receiving_Video_Conference()
{
try
{
// Open The Port
string i = "2.1.168.192";
long z = (long)(uint)IPAddress.NetworkToHostOrder((int)IPAddress.Parse(i).Address);
IPAddress ip = new IPAddress(z);
mytcpl = new TcpListener(ip, 6000);
mytcpl.Start(); // Start Listening on That Port
mysocket = mytcpl.AcceptSocket(); // Accept Any Request From Client and Start a Session
ns = new NetworkStream(mysocket); // Receives The Binary Data From Port
picture_comming.Image = Image.FromStream(ns);
mytcpl.Stop(); // Close TCP Session
if (mysocket.Connected == true) // Looping While Connected to Receive Another Message
{
while (true)
{
Start_Receiving_Video_Conference(); // Back to First Method
}
}
myns.Flush();
}
catch (Exception) { button1.Enabled = true; myth.Abort(); }
}
private void Start_Sending_Video_Conference(string remote_IP, int port_number)
{
try
{
ms = new MemoryStream();// Store it in Binary Array as Stream
IDataObject data;
Image bmap;
// Copy image to clipboard
SendMessage(hHwnd, WM_CAP_EDIT_COPY, 0, 0);
// Get image from clipboard and convert it to a bitmap
data = Clipboard.GetDataObject();
if (data.GetDataPresent(typeof(System.Drawing.Bitmap)))
{
bmap = ((Image)(data.GetData(typeof(System.Drawing.Bitmap))));
bmap.Save(ms, ImageFormat.Bmp);
}
picCapture.Image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
byte[] arrImage = ms.GetBuffer();
myclient = new TcpClient(remote_IP, port_number);//Connecting with server
myns = myclient.GetStream();
mysw = new BinaryWriter(myns);
mysw.Write(arrImage);//send the stream to above address
ms.Flush();
mysw.Flush();
myns.Flush();
ms.Close();
mysw.Close();
myns.Close();
myclient.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Video Conference Error Message", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
private void btnStart_Click(object sender, System.EventArgs e)
{
iDevice = int.Parse (device_number_textBox.Text);
OpenPreviewWindow();
}
private void btnStop_Click(object sender, System.EventArgs e)
{
ClosePreviewWindow();
}
private void Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
if (btnStop.Enabled)
{
ClosePreviewWindow();
}
}
private void button1_Click(object sender, EventArgs e)
{
button1.Enabled = false;
myth = new Thread(new System.Threading.ThreadStart(Start_Receiving_Video_Conference)); // Start Thread Session
myth.Start(); // Start Receiveing Camera
}
private void timer1_Tick(object sender, EventArgs e)
{
Start_Sending_Video_Conference(IP_textBox.Text, 6000);
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
try
{
mytcpl.Stop();
myth.Abort();
}
catch (Exception){}
}
private void button2_Click(object sender, EventArgs e)
{
timer1.Enabled = true;
}
}
}

Controlling a Camera with WIA

First of all, this is my first post in stackoverflow. I use this side very often and I found nearly everything I needed.
And now to my Question. I searched for this Question but I didn't really found anything. I wanted to write an application where I can click on a button and make a picture of a person and link that photo with the user in the database. Is it possible to control a camera with WIA? Do I need a special camera for that?
I would appreciate, if somebody could post a good Tutorial for the general use of WIA.

WIA Camera test example in C#. Took me a whole night!
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using WIA;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
this.button1.Text = "Select Camera";
this.label1.Text = "[ no camera selected ]";
}
private void Form1_Load(object sender, EventArgs e) { }
private String _label = null;
private void button1_Click_1(object sender, EventArgs e)
{
try
{
// create a new WIA common dialog box for the user to select a device from
WIA.CommonDialog dlg = new WIA.CommonDialog();
// show user the WIA device dialog
Device d = dlg.ShowSelectDevice(WiaDeviceType.CameraDeviceType, true, false);
// check if a device was selected
if (d != null)
{
// Print camera properties
richTextBox1.AppendText("\n\n Print properties:\n");
foreach (Property p in d.Properties)
{
richTextBox1.AppendText(p.Name + ": " + p.get_Value() + " ("+ p.PropertyID + ":" + p.IsReadOnly + ") \n");
// Update UI
if (p.PropertyID == 3) _label = (String) p.get_Value();
if (p.PropertyID == 4) _label = _label + " - " + p.get_Value();
this.label1.Text = _label;
}
// Print commands
richTextBox1.AppendText("\n\n Print commands:\n");
foreach (DeviceCommand dvc in d.Commands)
{
richTextBox1.AppendText(dvc.Name + ": " + dvc.Description + " ("+ dvc.CommandID +") \n");
}
// Print events
richTextBox1.AppendText("\n\n Print events:\n");
foreach (DeviceEvent dve in d.Events)
{
richTextBox1.AppendText(dve.Name + ": " + dve.Description + " (" + dve.Type + ") \n");
}
// Print item properties
richTextBox1.AppendText("\n\n Print item properties:\n");
foreach (Property item in d.Items[1].Properties)
{
richTextBox1.AppendText(item.IsReadOnly + ": " + item.Name + " (" + item.PropertyID + ") \n");
}
foreach (WIA.Property p in d.Properties)
{
Object tempNewProperty;
// change Exposure Compensation: value 0 to 2 (ID 2053, isReadonly False)
if (p.PropertyID == 2053)
{
tempNewProperty = (int) -2000; // can not be set to minus values, why???
((IProperty)p).set_Value(ref tempNewProperty);
richTextBox1.AppendText(">>>>" + p.get_Value());
}
}
// Now let's take a picture !
d.ExecuteCommand(CommandID.wiaCommandTakePicture);
richTextBox1.AppendText(".");
}
else
{
d = null;
richTextBox1.AppendText("Result: no device selected or device could not be read. ");
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "WIA Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}
}
namespace WindowsFormsApplication1
{
partial class Form1
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.button1 = new System.Windows.Forms.Button();
this.label1 = new System.Windows.Forms.Label();
this.richTextBox1 = new System.Windows.Forms.RichTextBox();
this.button2 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(12, 12);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(137, 23);
this.button1.TabIndex = 0;
this.button1.Text = "button1";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button1_Click_1);
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(9, 44);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(35, 13);
this.label1.TabIndex = 1;
this.label1.Text = "label1";
//
// richTextBox1
//
this.richTextBox1.Location = new System.Drawing.Point(12, 60);
this.richTextBox1.Name = "richTextBox1";
this.richTextBox1.Size = new System.Drawing.Size(946, 445);
this.richTextBox1.TabIndex = 2;
this.richTextBox1.Text = "";
//
// button2
//
this.button2.Location = new System.Drawing.Point(156, 11);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(173, 23);
this.button2.TabIndex = 3;
this.button2.Text = "button2";
this.button2.UseVisualStyleBackColor = true;
this.button2.Click += new System.EventHandler(this.button2_Click_1);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(970, 517);
this.Controls.Add(this.button2);
this.Controls.Add(this.richTextBox1);
this.Controls.Add(this.label1);
this.Controls.Add(this.button1);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.RichTextBox richTextBox1;
private System.Windows.Forms.Button button2;
}
}

It looks like Microsoft has provided a tutorial here.
I think you'd be specifically interested in the section Capturing a Still Image from Streaming Video.

I've been there and I've done that. You need a camera that has WIA drivers. Several ones do it. It's not easy but can be done for sure.

As for a WIA C# wrapper, I came across ScanWIA on Codeplex. It doesn't have a whole lot of documentation. However, reading the source code might help. Also, the project has a demo project that you may tailor to get pictures from a camera.