C # screen capture

Using system; Using system. runtime. interopservices; Using system. drawing; Using system. Drawing. imaging; Namespace screenshotdemo { /// <Summary> /// Capture full screen or an irregular Window Function and save it. /// </Summary> Public class screencapture { /// <Summary> /// Creates an image object containing a screen shot of the entire desktop? /// </Summary> /// <Returns> </returns> Public Image capturescreen () { Return capturewindow (user32.getdesktopwindow ()); } /// <Summary> /// Creates an image object containing a screen shot of a specific window? /// </Summary> /// <Param name = "handle"> the handle to the window. (In Windows Forms, this is obtained by the handle property) </param> /// <Returns> </returns> Public Image capturewindow (intptr handle) { // Get te HDC of the target window Intptr hdcsrc = user32.getwindowdc (handle ); // Get the size User32.rect windowrect = new user32.rect (); User32.getwindowrect (handle, ref windowrect ); Int width = windowrect. Right-windowrect. Left; Int Height = windowrect. Bottom-windowrect. Top; // Create a device context we can copy Intptr hdcdest = gdi32.createcompatibledc (hdcsrc ); // Create a bitmap we can copy it, // Using getdevicecaps to get the width/height Intptr hbitmap = gdi32.createcompatiblebitmap (hdcsrc, width, height ); // Select the bitmap object Intptr hold = gdi32.selectobject (hdcdest, hbitmap ); // Bitblt over Gdi32.bitblt (hdcdest, 0, 0, width, height, hdcsrc, 0, gdi32.srccopy ); // Restore Selection Gdi32.selectobject (hdcdest, hold ); // Clean up Gdi32.deletedc (hdcdest ); User32.releasedc (handle, hdcsrc ); // Get A. Net image object for it Image IMG = image. fromhbitmap (hbitmap ); // Free up the bitmap object Gdi32.deleteobject (hbitmap ); Return IMG; } /// // captures a screen shot of a specific window, and saves it to a file? /// /// /// // Public void capturewindowtofile (intptr handle, string filename, imageformat format) {< br> image IMG = capturewindow (handle); IMG. save (filename, format); } /// <Summary> /// Captures a screen shot of the entire desktop, and saves it to a file? /// </Summary> /// <Param name = "FILENAME"> </param> /// <Param name = "format"> </param> Public void capturescreentofile (string filename, imageformat format) { Image IMG = capturescreen (); IMG. Save (filename, format ); } /// <Summary> /// Helper class containing GDI32 API functions /// </Summary> Private class GDI32 { Public const int srccopy = 0x00cc0020; // bitblt dwrop Parameter [Dllimport ("gdi32.dll")] Public static extern bool bitblt (intptr hobject, int nxdest, int nydest, Int nwidth, int nheight, intptr hobjectsource, Int nxsrc, int nysrc, int dwrop ); [Dllimport ("gdi32.dll")] Public static extern intptr createcompatiblebitmap (intptr HDC, int nwidth, Int nheight ); [Dllimport ("gdi32.dll")] Public static extern intptr createcompatibledc (intptr HDC ); [Dllimport ("gdi32.dll")] Public static extern bool deletedc (intptr HDC ); [Dllimport ("gdi32.dll")] Public static extern bool deleteobject (intptr hobject ); [Dllimport ("gdi32.dll")] Public static extern intptr SelectObject (intptr HDC, intptr hobject ); } /// <Summary> /// Helper class containing USER32 API functions /// </Summary> Private class USER32 { [Structlayout (layoutkind. Sequential)] Public struct rect { Public int left; Public int top; Public int right; Public int bottom; } [Dllimport ("user32.dll")] Public static extern intptr getasktopwindow (); [Dllimport ("user32.dll")] Public static extern intptr getwindowdc (intptr hwnd ); [Dllimport ("user32.dll")] Public static extern intptr releasedc (intptr hwnd, intptr HDC ); [Dllimport ("user32.dll")] Public static extern intptr getwindowrect (intptr hwnd, ref rect ); } } }