Develop Reference

how to read excel data without manually telling the cells

My code when ran, opens a form and when that form opens, it opens and reads data from a excel spreadsheet. During the initial load, it reads the specific data from it's current cells. To test the theory of reading extra data, I manually re-read the data using a button and calling specific cells. Here is my code below:
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;
namespace test_read_data_from_excel
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
OpenFile();
}
public void OpenFile()
{
Excel excel = new Excel(#"Test.xlsx", 1);
textBox1.Text = excel.ReadCell(1, 0);
textBox2.Text = excel.ReadCell(1, 1);
textBox3.Text = excel.ReadCell(3, 2);
}
private void button1_Click(object sender, EventArgs e)
{
Form2 frm = new Form2();
frm.Show();
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void button2_Click(object sender, EventArgs e)
{
Excel excel = new Excel(#"Test.xlsx", 1);
textBox1.Text = excel.ReadCell(2, 0);
textBox2.Text = excel.ReadCell(2, 1);
textBox3.Text = excel.ReadCell(4 , 2);
}
}
}
How can I get the form to automatically read the data and then every 10 seconds display the next line or cells of data? P.S. I used a button to check to see if the reading of the next line of data or cells works correctly.

For the timer functionality, try something like this:
private void InitializeTimer()
{
// Call this procedure when the application starts.
// Set to 10 seconds.
Timer1.Interval = 10000; // .Interval is in milliseconds
Timer1.Tick += new EventHandler(Timer1_Tick);
// Enable timer.
Timer1.Enabled = true;
}
private void Timer1_Tick(object Sender, EventArgs e)
{
//Call any excel code you want to run every 10 seconds here
}

How to make Transparent Web-browser control

I have a system windows forms where i show the web browser control over the media-player control as shown in image below,
I want to make Transparent web browser control. I have try many things but i am not able to make transparency over web browser control, i have try :
this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
this.BackColor = Color.FromArgb(0, 0, 0, 0);
this.TransparencyKey = Color.Red;
this.BackColor = Color.Magenta;
this.TransparencyKey = Color.Magenta;*/
SetStyle(ControlStyles.SupportsTransparentBackColor, true);
this.BackColor = Color.Transparent;
My code is :
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 Microsoft.DirectX.AudioVideoPlayback;
using System.Windows.Forms;
namespace Windows_Video
{
public partial class Form1 : Form
{
Video vdo;
public string mode = "play";
public string PlayingPosition, Duration;
public Form1()
{
InitializeComponent();
// VolumeTrackBar.Value = 4;
}
private void Form1_Load(object sender, EventArgs e)
{
OpenFileDialog openFileDialog1 = new OpenFileDialog();
if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
this.textBox1.Text = openFileDialog1.FileName;
}
axWindowsMediaPlayer1.URL = textBox1.Text;
axWindowsMediaPlayer1.Ctlcontrols.play();
}
private void button1_Click(object sender, EventArgs e)
{
/* OpenFileDialog openFileDialog1 = new OpenFileDialog();
if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
this.textBox1.Text = openFileDialog1.FileName;
}*/
}
private void button2_Click(object sender, EventArgs e)
{
// axWindowsMediaPlayer1.URL = textBox1.Text;
// axWindowsMediaPlayer1.Ctlcontrols.play();
}
private void button3_Click(object sender, EventArgs e)
{
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
//this.BackColor = System.Drawing.Color.Transparent;
this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
this.BackColor = Color.Transparent;
}
}
}

you have to make another form with a web browser control set the opacity 50% in the form properties and then call on button or by some other method it will be work:
private void button1_Click(object sender, EventArgs e)
{
Form2 min = new Form2();
min.Show();
}
By this technique u can set the opacity over web browser control/full form

Change file attribute pragmatically

im kinda new to programming and As university project,i have to write a program which changes a file info like a virus and then undo the changes just like anti virus.
i wrote the code for changing attribute on read only,But what about Hidden or system file ?
and what is the way for undoing it !
where im going wrong in coding ??
Here is my main form code :
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;
namespace WindowsFormsApplication6
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
OpenFileDialog fDialog;
void button1_Click(object sender, EventArgs e) // Browse button
{
fDialog = new OpenFileDialog();
fDialog.Title = "Open a Text File";
fDialog.Filter = "TXT Files|*.txt|doc Files|*.doc";
fDialog.InitialDirectory = #"C:\";
if (fDialog.ShowDialog() == DialogResult.OK)
{
MessageBox.Show(fDialog.FileName.ToString());
}
textBox1.Text = fDialog.FileName;
fDialog.AddExtension = true;
fDialog.CheckFileExists = true;
fDialog.CheckPathExists = true;
}
private void textBox1_TextChanged(object sender, EventArgs e)//the path showing text box
{
}
private void button2_Click(object sender, EventArgs e)//read-only button
{
fDialog.ReadOnlyChecked = true;
}
private void button3_Click(object sender, EventArgs e) //Hidden button
{
}
}
}

Aforge for webcam

I wrote a code for acessing the webcam with two buttons and a picture box
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 AForge.Imaging;
using AForge.Imaging.Filters;
using AForge.Video;
using AForge.Video.DirectShow;
namespace cam
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private FilterInfoCollection webcam;
private VideoCaptureDevice cam;
Bitmap bitmap;
private void Form1_Load(object sender, EventArgs e)
{
webcam = new FilterInfoCollection(FilterCategory.VideoInputDevice);
foreach (FilterInfo VideoCaptureDevice in webcam)
{
comboBox1.Items.Add(VideoCaptureDevice.Name);
}
comboBox1.SelectedIndex = 0;
}
private void button1_Click(object sender, EventArgs e)
{
cam = new VideoCaptureDevice(webcam[comboBox1.SelectedIndex].MonikerString);
cam.NewFrame += new NewFrameEventHandler(cam_NewFrame);
cam.Start();
}
void cam_NewFrame(object sender, NewFrameEventArgs eventArgs)
{
Bitmap bitmap = (Bitmap)eventArgs.Frame.Clone();
pictureBox1.Image = bitmap;
}
private void button3_Click(object sender, EventArgs e)
{
if (cam.IsRunning)
{
cam.Stop();
}
}
private void pictureBox1_Click(object sender, EventArgs e)
{
pictureBox1.Image = bitmap;
}
}
}
The code build up successfully. but on debugging the picture box is not working. start and stop is working properly. Can anyone help?

you have to delete first
Bitmap bitmap;
because its null and that what you show in picture box
not the picture that come from camera

a long time ago i had problems too with aforge but got it working
see my code inhere : How initialize AForge webcam

Ink to memorystream problem

I was trying to convert an ink from Microsoft.Ink namespace to memorystream, so to convert it to image, but I don't understand why it's getting an error in the memorystream. I kind of felt that it was an error from Convert.FromBase64String()
But I don't know what other choices I have to convert it to image.
Please help me
Here is my code:
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 System.IO;
using Microsoft.Ink;
namespace testPaint
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
InkCollector ink;
private void Form1_Load(object sender, EventArgs e)
{
ink = new InkCollector(pictureBox1);
ink.Enabled = true;
ink.AutoRedraw = true;
}
private void btnSave_Click(object sender, EventArgs e)
{
UTF8Encoding utf8 = new UTF8Encoding();
ink.Enabled = false;
string strInk = Convert.ToBase64String(ink.Ink.Save(PersistenceFormat.Base64InkSerializedFormat, CompressionMode.Maximum));
textBox1.Text = strInk;
ink.Enabled = true;
}
private void btnClr_Click(object sender, EventArgs e)
{
ink.Enabled = false;
ink.Ink = new Microsoft.Ink.Ink();
ink.Enabled = true;
pictureBox1.Invalidate();
}
private void btnExport_Click(object sender, EventArgs e)
{
byte[] byImage = Convert.FromBase64String(textBox1.Text);
MemoryStream ms = new MemoryStream();
ms.Write(byImage, 0, byImage.Length);
Image img = Image.FromStream(ms);
img.Save("test.gif", System.Drawing.Imaging.ImageFormat.Gif);
ink.Enabled = true;
}
}
}

The documentation is very preliminary but I think you are probably using the wrong PersistenceFormat tag: you are using Base64 as the output format but you clearly want PersistenceFormat.Gif.
Apart from that, your conversion to and from a string is really not at all meaningful. Just use a private byte[] variable to store the ink data. Furthermore, your detour via a MemoryStream and a System.Graphics.Image makes no sense either.
// using System.IO;
private byte[] inkData;
private void btnSave_Click(object sender, EventArgs e)
{
inkData = ink.Ink.Save(PersistenceFormat.Gif, CompressionMode.Maximum);
}
private void btnExport_Click(object sender, EventArgs e)
{
// Data is already in GIF format, write directly to file!
using (var stream = new FileStream("filename", FileMode.Create, FileAccess.Write))
stream.Write(inkData, 0, inkData.Length);
}