C# Class Accord.Video.WindowCaptureStream

Screen capture video source.

The video source constantly captures the desktop screen.

Sample usage:

 // get entire desktop area size Rectangle screenArea = Rectangle.Empty; foreach ( System.Windows.Forms.Screen screen in  System.Windows.Forms.Screen.AllScreens ) { screenArea = Rectangle.Union( screenArea, screen.Bounds ); } // create screen capture video source ScreenCaptureStream stream = new ScreenCaptureStream( screenArea ); // set NewFrame event handler stream.NewFrame += new NewFrameEventHandler( video_NewFrame ); // start the video source stream.Start( ); // ... // signal to stop stream.SignalToStop( ); // ... private void video_NewFrame( object sender, NewFrameEventArgs eventArgs ) { // get new frame Bitmap bitmap = eventArgs.Frame; // process the frame }

Show file Open project: Webreaper/Damselfly

Public Methods

Method	Description
SignalToStop ( ) : void	Signal video source to stop its work. Signals video source to stop its background thread, stop to provide new frames and free resources.
Start ( ) : void	Start video source. Starts video source and return execution to caller. Video source object creates background thread and notifies about new frames with the help of NewFrame event.
Stop ( ) : void	Stop video source. Stops video source aborting its thread. Since the method aborts background thread, its usage is highly not preferred and should be done only if there are no other options. The correct way of stopping camera is signaling it stop and then waiting for background thread's completion.
WaitForStop ( ) : void	Wait for video source has stopped. Waits for source stopping after it was signalled to stop using SignalToStop method.
WindowCaptureStream ( IntPtr windowHandle, Rectangle region ) : Accord.Compat	Initializes a new instance of the ScreenCaptureStream class.
WindowCaptureStream ( IntPtr windowHandle, Rectangle region, int frameInterval ) : Accord.Compat	Initializes a new instance of the ScreenCaptureStream class.

Private Methods

Method	Description
BitBlt ( IntPtr hObject, int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hObjectSource, int nXSrc, int nYSrc, int dwRop ) : bool
Free ( ) : void	Free resource.
WorkerThread ( ) : void

Method Details

SignalToStop() public method

Signal video source to stop its work.

Signals video source to stop its background thread, stop to provide new frames and free resources.

public SignalToStop ( ) : void
return	void

Start() public method

Start video source.

Starts video source and return execution to caller. Video source object creates background thread and notifies about new frames with the help of NewFrame event.

Video source is not specified.

public Start ( ) : void
return	void

Stop() public method

Stop video source.

Stops video source aborting its thread.

Since the method aborts background thread, its usage is highly not preferred and should be done only if there are no other options. The correct way of stopping camera is signaling it stop and then waiting for background thread's completion.

public Stop ( ) : void
return	void

WaitForStop() public method

Wait for video source has stopped.

Waits for source stopping after it was signalled to stop using SignalToStop method.

public WaitForStop ( ) : void
return	void

WindowCaptureStream() public method

Initializes a new instance of the ScreenCaptureStream class.

public WindowCaptureStream ( IntPtr windowHandle, Rectangle region ) : Accord.Compat
windowHandle	IntPtr
region	Rectangle	Screen's rectangle to capture (the rectangle may cover multiple displays).
return	Accord.Compat

WindowCaptureStream() public method

Initializes a new instance of the ScreenCaptureStream class.

public WindowCaptureStream ( IntPtr windowHandle, Rectangle region, int frameInterval ) : Accord.Compat
windowHandle	IntPtr
region	Rectangle	Screen's rectangle to capture (the rectangle may cover multiple displays).
frameInterval	int	Time interval between making screen shots, ms.
return	Accord.Compat