How to capture a PC like TeamViewer?

We have some thrid party controls.
Instead we could write it on our own.

for ex :
Create a Movie Maker Class:

public delegate void RenderFrameDelegate(int frame, AutoResetEvent doneWaitHandle);

public delegate void CaptureCompleteDelegate(MovieMaker mm);

public class MovieMaker

{

private int _totalFrames;

private Control _captureControl;

private RenderFrameDelegate _renderMethod;

private CaptureCompleteDelegate _captureComplete;

private AutoResetEvent _waitHandle = new AutoResetEvent(false);

private bool CaptureSameFrameTwice;

//private string _imagePath = @"C:\Video Capture Test";

//private DateTime _fileName;

//public MovieMaker(Control captureControl, int totalFrames, RenderFrameDelegate renderMethod, CaptureCompleteDelegate captureComplete, DateTime filename)

public MovieMaker(Control captureControl, int totalFrames, RenderFrameDelegate renderMethod, CaptureCompleteDelegate captureComplete, bool shallCaptureTwice)

{

_captureControl = captureControl;

_totalFrames = totalFrames;

_renderMethod = renderMethod;

_captureComplete = captureComplete;

//_fileName = filename;

Frames = new List();

CaptureSameFrameTwice = shallCaptureTwice;

}

public void Start()

{

IsCapturing = true;

IsComplete = false;

ThreadPool.QueueUserWorkItem(RunOnBackgroundThread);

}

private void RunOnBackgroundThread(object state)

{

int i = 0;

int captureCount;

int capturedCount = 0;

bool firstFrame = true;

if (CaptureSameFrameTwice)

{

captureCount = 2;

}

else

{

captureCount = 1;

}

while (i < _totalFrames)

{

// Call delegate to render the control

_captureControl.Invoke((ThreadStart)delegate { _renderMethod(i, _waitHandle); });

// Wait to finish

_waitHandle.WaitOne();

// Capture image

_captureControl.Invoke((ThreadStart)delegate

{

Application.DoEvents();

using (Image img = new Bitmap(_captureControl.Width, _captureControl.Height))

using (MemoryStream stream = new MemoryStream())

{

Graphics g = Graphics.FromImage(img);

Point pt = _captureControl.PointToScreen(new Point(0, 0));

g.CopyFromScreen(pt, new Point(0, 0), _captureControl.ClientSize);

img.Save(stream, ImageFormat.Jpeg);

// img.Save(_imagePath + "\\" + _fileName.ToString("yyyyMMddhhmmss") +i.ToString()+".jpg",ImageFormat.Jpeg);

Frames.Add(stream.ToArray());

}

});

capturedCount += 1;

if (capturedCount == captureCount)

{

capturedCount = 0;

i++;

}

if (captureCount == 1 && firstFrame == true)

{

i--;

firstFrame = false;

}

// Raise complete event

_captureControl.Invoke((ThreadStart)delegate

{

IsCapturing = false;

IsComplete = true;

_captureComplete(this);

});

}

public List Frames { get; set; }

public bool IsCapturing { get; private set; }

public bool IsComplete { get; private set; }

and then in ur form where want to capture use the below lines:

MovieMaker mc = new MovieMaker(this, videoFrameCount, RenderFrame, CaptureComplete, ShallCaptureTwice);

mc.Start();

private void RenderFrame(int frame, AutoResetEvent waitHandle)

{

if (frame <= videoFrameCount)

{

if (frame == videoFrameCount - 1)

DisableProgressBar();

waitHandle.Set();

}

private void CaptureComplete(MovieMaker mm)

{
// Save the data where want to save
}

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Nattudurai Eswaramurthy14y ago
We have some thrid party controls.
Instead we could write it on our own.

for ex :
Create a Movie Maker Class:

public delegate void RenderFrameDelegate(int frame, AutoResetEvent doneWaitHandle);
public delegate void CaptureCompleteDelegate(MovieMaker mm);

public class MovieMaker
{
private int _totalFrames;
private Control _captureControl;
private RenderFrameDelegate _renderMethod;
private CaptureCompleteDelegate _captureComplete;
private AutoResetEvent _waitHandle = new AutoResetEvent(false);
private bool CaptureSameFrameTwice;
//private string _imagePath = @"C:\Video Capture Test";
//private DateTime _fileName;
//public MovieMaker(Control captureControl, int totalFrames, RenderFrameDelegate renderMethod, CaptureCompleteDelegate captureComplete, DateTime filename)
public MovieMaker(Control captureControl, int totalFrames, RenderFrameDelegate renderMethod, CaptureCompleteDelegate captureComplete, bool shallCaptureTwice)
{
_captureControl = captureControl;
_totalFrames = totalFrames;
_renderMethod = renderMethod;
_captureComplete = captureComplete;
//_fileName = filename;
Frames = new List();
CaptureSameFrameTwice = shallCaptureTwice;
}

public void Start()
{
IsCapturing = true;
IsComplete = false;
ThreadPool.QueueUserWorkItem(RunOnBackgroundThread);
}

private void RunOnBackgroundThread(object state)
{
int i = 0;
int captureCount;
int capturedCount = 0;
bool firstFrame = true;
if (CaptureSameFrameTwice)
{
captureCount = 2;
}
else
{
captureCount = 1;
}
while (i < _totalFrames)
{
// Call delegate to render the control
_captureControl.Invoke((ThreadStart)delegate { _renderMethod(i, _waitHandle); });

// Wait to finish
_waitHandle.WaitOne();

// Capture image
_captureControl.Invoke((ThreadStart)delegate
{
Application.DoEvents();
using (Image img = new Bitmap(_captureControl.Width, _captureControl.Height))
using (MemoryStream stream = new MemoryStream())
{
Graphics g = Graphics.FromImage(img);
Point pt = _captureControl.PointToScreen(new Point(0, 0));
g.CopyFromScreen(pt, new Point(0, 0), _captureControl.ClientSize);
img.Save(stream, ImageFormat.Jpeg);
// img.Save(_imagePath + "\\" + _fileName.ToString("yyyyMMddhhmmss") +i.ToString()+".jpg",ImageFormat.Jpeg);
Frames.Add(stream.ToArray());

}
});

capturedCount += 1;
if (capturedCount == captureCount)
{
capturedCount = 0;
i++;
}
if (captureCount == 1 && firstFrame == true)
{
i--;
firstFrame = false;
}

}

// Raise complete event
_captureControl.Invoke((ThreadStart)delegate
{
IsCapturing = false;
IsComplete = true;
_captureComplete(this);
});

}

public List Frames { get; set; }

public bool IsCapturing { get; private set; }

public bool IsComplete { get; private set; }

and then in ur form where want to capture use the below lines:

MovieMaker mc = new MovieMaker(this, videoFrameCount, RenderFrame, CaptureComplete, ShallCaptureTwice);
mc.Start();

private void RenderFrame(int frame, AutoResetEvent waitHandle)
{
if (frame <= videoFrameCount)
{
if (frame == videoFrameCount - 1)
DisableProgressBar();
waitHandle.Set();

}
}

private void CaptureComplete(MovieMaker mm)
{
// Save the data where want to save
}