public static Image GrabScreen(IntPtr hWnd, Point location, Size size)
{
Image myImage = new Bitmap(size.Width, size.Height);
Graphics g = Graphics.FromImage(myImage);
IntPtr destDeviceContext = g.GetHdc();
IntPtr srcDeviceContext = Win32API.GetWindowDC(hWnd);
Win32API.BitBlt(destDeviceContext, 0, 0, size.Width, size.Height, srcDeviceContext, location.X, location.Y, Win32API.SRCCOPY);
Win32API.ReleaseDC(hWnd, srcDeviceContext);
g.ReleaseHdc(destDeviceContext);
return(myImage);
}
private Image GetScreenShot()
{
IntPtr windowHandle = Win32API.GetDesktopWindow();
RECT desktopRect;
Win32API.GetWindowRect(windowHandle, out desktopRect);
Image myImage = new Bitmap(desktopRect.Width, desktopRect.Height);
Graphics g = Graphics.FromImage(myImage);
IntPtr destDeviceContext = g.GetHdc();
IntPtr srcDeviceContext = Win32API.GetWindowDC(windowHandle);
Win32API.BitBlt(destDeviceContext, 0, 0, desktopRect.Width, desktopRect.Height, srcDeviceContext, 0, 0, Win32API.SRCCOPY);
Win32API.ReleaseDC(windowHandle, srcDeviceContext);
g.ReleaseHdc(destDeviceContext);
return(myImage);
}
public static Bitmap CaptureWindow(IntPtr handle)
{
// get te hDC of the target window
var hdcSrc = Win32API.GetWindowDC(handle);
// get the size
var windowRect = new RECT();
Win32API.GetWindowRect(handle, out windowRect);
int width = (int)Math.Round((windowRect.Right - windowRect.Left) / Helper.Rate);
int height = (int)Math.Round((windowRect.Bottom - windowRect.Top) / Helper.Rate);
// create a device context we can copy to
var hdcDest = Win32API.CreateCompatibleDC(hdcSrc);
// create a bitmap we can copy it to,
// using GetDeviceCaps to get the width/height
var hBitmap = Win32API.CreateCompatibleBitmap(hdcSrc, width, height);
// select the bitmap object
var hOld = Win32API.SelectObject(hdcDest, hBitmap);
// bitblt over
Win32API.BitBlt(hdcDest, 0, 0, width, height, hdcSrc, 0, 0, SRCCOPY);
// restore selection
Win32API.SelectObject(hdcDest, hOld);
// clean up
Win32API.DeleteDC(hdcDest);
Win32API.ReleaseDC(handle, hdcSrc);
// get a .NET image object for it
Bitmap img = System.Drawing.Image.FromHbitmap(hBitmap);
// free up the Bitmap object
Win32API.DeleteObject(hBitmap);
return(img);
}
/* Image CaptureWindow(IntPtr handle)
* return an image of expected handle.
*/
public static Image CaptureWindow(IntPtr handle)
{
try
{
if (handle == IntPtr.Zero)
{
throw new Exception("Handle can not be 0.");
}
// get the size
Win32API.Rect windowRect = new Win32API.Rect();
Win32API.GetWindowRect(handle, ref windowRect);
int width = windowRect.right - windowRect.left;
int height = windowRect.bottom - windowRect.top;
if (width > 0 && height > 0)
{
bool printed = false;
//firstly, try PrintWindow to get the image of the window.
Bitmap bm = new Bitmap(width, height);
using (Graphics g = Graphics.FromImage(bm))
{
System.IntPtr bmDC = g.GetHdc();
printed = Win32API.PrintWindow(handle, bmDC, 0);
g.ReleaseHdc(bmDC);
}
if (printed)
{
return(bm);
}
else
{
//not printed, try other way.
// get te hDC of the target window
IntPtr hdcSrc = Win32API.GetWindowDC(handle);
// create a device context we can copy to
IntPtr hdcDest = Win32API.CreateCompatibleDC(hdcSrc);
// create a bitmap we can copy it to,
IntPtr hBitmap = Win32API.CreateCompatibleBitmap(hdcSrc, width, height);
// select the bitmap object
IntPtr hOld = Win32API.SelectObject(hdcDest, hBitmap);
// bitblt over
Win32API.BitBlt(hdcDest, 0, 0, width, height, hdcSrc, 0, 0, Win32API.SRCCOPY);
// restore selection
Win32API.SelectObject(hdcDest, hOld);
// clean up
Win32API.DeleteDC(hdcDest);
Win32API.ReleaseDC(handle, hdcSrc);
// get a .NET image object for it
Image img = Image.FromHbitmap(hBitmap);
// free up the Bitmap object
Win32API.DeleteObject(hBitmap);
return(img);
}
}
else
{
throw new Exception("Can not get size infomation of the window.");
}
}
catch (Exception ex)
{
throw new Exception(ex.ToString());
}
}