I am using the ADF Scanner library by Gideon (http://adfwia.codeplex.com/) and have hit a small problem. While I can scan a file it throws an exception when saving. I'll post the full code:
private void button1_Click(object sender, EventArgs e)
{
ADFScan _scanner;
int[] _colors = { 1, 2, 4 };
int count = 0;
_scanner = new ADFScan();
_scanner.Scanning += new EventHandler<WiaImageEventArgs>(_scanner_Scanning);
_scanner.ScanComplete += new EventHandler(_scanner_ScanComplete);
ScanColor selectedColor = ScanColor.Color;
// ScanColor selectedColor = (ScanColor)_colors[comboBox1.SelectedIndex];
int dpi = 300;
_scanner.BeginScan(selectedColor, dpi);
}
void _scanner_ScanComplete(object sender, EventArgs e)
{
MessageBox.Show("Scan Complete");
}
void _scanner_Scanning(object sender, WiaImageEventArgs e)
{//e.ScannedImage is a System.Drawing.Image
int count = 0;
string filename = "C:\\test.jpg";
e.ScannedImage.Save(filename, ImageFormat.Jpeg);//FILES ARE RETURNED AS BITMAPS
}
The program begins to scan without an issue, and in fact can scan multiple pages at the same time (what I needed!) The exception thrown is this one
The system cannot find the file specified. (Exception from HRESULT: 0x80070002)
Huh? Anyone with experience with this can help me? Thanks a lot in advance =)
Related
This is my code that i try to connect to a telegram bot
namespace telegramUpdate
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
TelegramBotClient bot = new TelegramBotClient("xxxxxxxxx");
int offset = 23;
Update temp = null;
private void Form1_Load(object sender, EventArgs e)
{
backgroundWorker1.RunWorkerAsync();
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
while (true)
{
try
{
var m = Task.Run(async()=> bot.GetUpdatesAsync(offset,50)).Result;
foreach (var x in m.Result)
{
switch (x.Type)
{
case UpdateType.MessageUpdate:
temp = x;
backgroundWorker1.ReportProgress(0);
bot.SendTextMessageAsync(x.Message.Chat.Id, ":)").ConfigureAwait(false);
break;
}
offset = x.Id+1;
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
backgroundWorker1.RunWorkerAsync();
}
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
label1.Text = temp.Message.From.FirstName;
}
}
}
after ruining message box show "One or more errors occurred." what is the problem? telegram bot should reply ":)" but it don't. I can not find out if m receive any updates or not.
try this:
bot.SendTextMessageAsync(x.Message.Chat.Id, ":)").GetAwaiter().GetResult();
you didn't execute the task. just it
to me this same error happen recently (the code was working on Feb 2020 but did not work later) when making bot.SendTextMessageAsync i received same exception. After some research i found this topic [Telegram Bot stops with An unhandled exception of type 'System.AggregateException' occurred in mscorlib.dll
that actually solved my problem.
using System.Net;
ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
I'm trying to convert a pdf into a PNG, using the code given in the following example (the first function) : https://ghostscriptnet.codeplex.com/SourceControl/latest#Ghostscript.NET/Ghostscript.NET.Samples/Samples/DeviceUsageSample.cs
However, I get this error on launch : " An error occured when call to 'gsapi_init_with_args' is made: -100"... which doesn't mean a lot.
How comes this basic example doesn't work ? I downloaded the latest Ghostscript.NET.dll here : https://ghostscriptnet.codeplex.com/ and added it to the references of the project. My OS is Windows 7 x32 bits and I run VisualStudio as an administrator.
Here is my code :
private void button6_Click(object sender, EventArgs e)
{
GhostscriptPngDevice devPNG = new GhostscriptPngDevice(GhostscriptPngDeviceType.Png256);
devPNG.GraphicsAlphaBits = GhostscriptImageDeviceAlphaBits.V_4;
devPNG.TextAlphaBits = GhostscriptImageDeviceAlphaBits.V_4;
devPNG.ResolutionXY = new GhostscriptImageDeviceResolution(96, 96);
devPNG.InputFiles.Add(#"D:\Public\FOS.pdf");
devPNG.OutputPath = #"D:\Public\FOS.png";
devPNG.Process();
}
I tried replacing the path of the input and output by one without any space and it now works ! Here is the code I ended up using :
using Ghostscript.NET.Rasterizer;
private void button6_Click(object sender, EventArgs e)
{
int desired_x_dpi = 96;
int desired_y_dpi = 96;
string inputPdfPath = #"D:\Public\temp\rasterizer\FOS.pdf";
string outputPath = #"D:\Public\temp\rasterizer\output\";
using (var rasterizer = new GhostscriptRasterizer())
{
rasterizer.Open(inputPdfPath);
for (var pageNumber = 1; pageNumber <= rasterizer.PageCount; pageNumber++)
{
var pageFilePath = Path.Combine(outputPath, string.Format("Page-{0}.png", pageNumber));
var img = rasterizer.GetPage(desired_x_dpi, desired_y_dpi, pageNumber);
img.Save(pageFilePath + "ImageFormat.Png");
}
}
}
Try to replace any character strange (non alpanumeric and spaces, keep filepath "clean" and in shared/temp folder to grant access to any user/process and should work just fine
i am working to make a c# program that can start streaming webcam, close and capture the still image when closing.
the programs work as excepted on my development machine but when i open it on other it dosent work and gives me unhandled exception: Afroge.Video.DirectShow error.
I have added references AFroge.Video.dll and AFroge.Video.DirectShow.dll
here is the exe file and code of my project.
sendspace .com/file/4okqsi
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;
//Create using directives for easier access of AForge library's methods
using AForge.Video;
using AForge.Video.DirectShow;
namespace aforgeWebcamTutorial
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
//Create webcam object
VideoCaptureDevice videoSource;
private void Form1_Load(object sender, EventArgs e)
{
}
void videoSource_NewFrame(object sender, AForge.Video.NewFrameEventArgs eventArgs)
{
//Cast the frame as Bitmap object and don't forget to use ".Clone()" otherwise
//you'll probably get access violation exceptions
pictureBoxVideo.BackgroundImage = (Bitmap)eventArgs.Frame.Clone();
}
private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
//Stop and free the webcam object if application is closing
if (videoSource != null && videoSource.IsRunning)
{
videoSource.SignalToStop();
videoSource = null;
}
}
private void button1_Click(object sender, EventArgs e)
{
try {
if (videoSource.IsRunning)
{
videoSource.Stop();
pictureBoxVideo.BackgroundImage.Save("abc.png");
pictureBoxVideo.BackgroundImage = null;
}
}
catch (Exception er) { }
}
private void button2_Click(object sender, EventArgs e)
{
try {
//List all available video sources. (That can be webcams as well as tv cards, etc)
FilterInfoCollection videosources = new FilterInfoCollection(FilterCategory.VideoInputDevice);
//Check if atleast one video source is available
if (videosources != null)
{
//For example use first video device. You may check if this is your webcam.
videoSource = new VideoCaptureDevice(videosources[0].MonikerString);
try
{
//Check if the video device provides a list of supported resolutions
if (videoSource.VideoCapabilities.Length > 0)
{
string highestSolution = "0;0";
//Search for the highest resolution
for (int i = 0; i < videoSource.VideoCapabilities.Length; i++)
{
if (videoSource.VideoCapabilities[i].FrameSize.Width > Convert.ToInt32(highestSolution.Split(';')[0]))
highestSolution = videoSource.VideoCapabilities[i].FrameSize.Width.ToString() + ";" + i.ToString();
}
//Set the highest resolution as active
videoSource.VideoResolution = videoSource.VideoCapabilities[Convert.ToInt32(highestSolution.Split(';')[1])];
}
}
catch { }
//Create NewFrame event handler
//(This one triggers every time a new frame/image is captured
videoSource.NewFrame += new AForge.Video.NewFrameEventHandler(videoSource_NewFrame);
//Start recording
videoSource.Start();
}
}
catch (Exception er) { }
}
}
}
Try this link!
It worked for me!
If some parts cannot be installed. Delete all of the assemblies of AForge.Net and follow following tutorial.
https://premsivakumar.wordpress.com/2010/06/28/aforge-net-visual-studio-2010-setup-tutorial/
I am relativity new EmguCV but I have done a lot of research and read a few tutorials and look through this site for the answer. All of the other people with similar problems are told to add the unmangaged dll to the output folder. I have done this and I am still getting this error 'Emgu.CV.Invoke' threw an exception.
using Emgu.CV;
using Emgu.Util;
using Emgu.CV.Structure;
using AForge;
using AForge.Video;
using AForge.Video.DirectShow;
using AForge.Video.VFW;
using System.Drawing.Imaging;
using System.IO;
namespace WindowsFormsApplication2
{
public partial class SandBox : Form
{
private bool DeviceExist = false;
public VideoCaptureDevice FinalVideoSource;
public FilterInfoCollection VideoCaptureDevices;
private Capture capture;
private VideoWriter captureOutput;
private void FinalVideoSource_NewFrame(object sender, AForge.Video.NewFrameEventArgseventArgs)
{
Bitmap image = (Bitmap)eventArgs.Frame.Clone();
image.RotateFlip(RotateFlipType.Rotate180FlipY);
pictureBox1.Image = image;
}
public SandBox()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
label1.Text = " ";
FPS.Text = " ";
try
{
VideoCaptureDevices = new FilterInfoCollection(AForge.Video.DirectShow.FilterCategory.VideoInputDevice);
DeviceExist = true;
foreach (AForge.Video.DirectShow.FilterInfo VideoCaptureDevice in VideoCaptureDevices)
{
comboBox1.Items.Add(VideoCaptureDevice.Name);
}
comboBox1.SelectedIndex = 0;
}
catch (ApplicationException)
{
DeviceExist = false;
comboBox1.Items.Add("No device on your system");
}
}
private void Start_Click(object sender, EventArgs e)
{
FinalVideoSource = new VideoCaptureDevice(VideoCaptureDevices[comboBox1.SelectedIndex].MonikerString);
FinalVideoSource.NewFrame += new NewFrameEventHandler(FinalVideoSource_NewFrame);
FinalVideoSource.Start();
label1.Text = "Device running...";
Start.Enabled = false;
Stop.Enabled = true;
timer1.Enabled = true;
capture = new Capture();
captureOutput = new VideoWriter("test.avi", 30, 1280, 720, true);
Image<Bgr, Byte> ImageFrame = capture.QueryFrame();
captureOutput.WriteFrame(ImageFrame);
}
}
The error is being thrown in line capture = new Capture();. I cant figure out what is wrong with the project. Just to clarify I am only using EmguCV to record video not to display it on screen. Any help would be greatly appreciated.
The type initializer for 'Emgu.CV.CvInvoke' threw an exception its means that EMGU.CV file is not dectecting by code. this is due to system dependency. you need to go in to configration manger window in visual stdio and choose your required platform and then copy respective dll files(64 dll files forx64 and 32bit dll for x86 can be downloaded from emgu website ) according to your platform. copile it now there is no error like emgu.cv.invoke
http://www.emgu.com/wiki/index.php/Setting_up_EMGU_C_Sharp
I have a simple Winforms app that allows users to select multiple videos (files) simultaneously and runs background workers threads to loop through each of the videos in the BW. Have pasted code below, I get a NullReferenceException as "Unable to create capture from ..." at this line
Capture _capture = new Capture(videoFileName)
in processVideo method.
N.B: The same code work fine if I select a single video. So some issue with the multiple instances of Capture class.
I would expect the ProcessVideo method to have new instance of Capture and open it separately. Any ideas on what I might be doing wrong?
private void openVideoToolStripMenuItem_Click(object sender, EventArgs e)
{
try
{
OpenFileDialog ofd = new OpenFileDialog();
ofd.Filter = "Video | *.AVI;*.MPEG;*.WMV;*.MP4;*.MOV;*.MPG;*.MPEG;*.MTS;*.FLV";
ofd.Multiselect = true;
if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
string[] videos = ofd.FileNames;
if (videos != null)
{
BackgroundWorker[] bw = new BackgroundWorker[videos.GetLength(0)];
int n = 0;
foreach (string video in videos)
{
bw[n] = new BackgroundWorker();
bw[n].DoWork += new DoWorkEventHandler(bw_DoWork);
bw[n++].RunWorkerAsync(video);
}
}
}
}
catch (NullReferenceException excpt)
{
MessageBox.Show(excpt.Message);
}
}
void bw_DoWork(object sender, DoWorkEventArgs e)
{
string filename = (string)e.Argument;
ProcessVideo(filename);
}
private void ProcessVideo(string videoFileName)
{
Capture _capture = new Capture(videoFileName);
UInt64 TOTAL_FRAMES = Convert.ToUInt64(_capture.GetCaptureProperty(Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FRAME_COUNT));
for (UInt64 n = 0; n < TOTAL_FRAMES; n++)
{
using (Image<Bgr, Byte> img1 = _capture.QueryFrame())
{
//do something with the frame
}
}
}
I suggest you to update Sourcesafe service pack
it may help you
[I think you code is perfect there is
nothing wrong in it.
You got an error while creating object it clearly saw that
there may be chance that file format is not supported
or may be internal error problem.]
Let me know that after doing updation it works or not.
Regards Red