private void CaptureWindow(IntPtr handle, string fileName)
{
IntPtr hdcSrc = GetWindowDC(handle);
RECT windowRect = new RECT();
GetWindowRect(handle, ref windowRect);
int width = windowRect.right - windowRect.left;
int height = windowRect.bottom - windowRect.top;
width -= (width % 4);
IntPtr hdcDest = GDI32Api.CreateCompatibleDC(hdcSrc);
IntPtr hBitmap = GDI32Api.CreateCompatibleBitmap(hdcSrc, width, height);
IntPtr hOld = GDI32Api.SelectObject(hdcDest, hBitmap);
GDI32Api.BitBlt(hdcDest, 0, 0, width, height, hdcSrc, 0, 0, GDI32Api.SRCCOPY);
GDI32Api.SelectObject(hdcDest, hOld);
GDI32Api.DeleteDC(hdcDest);
User32Api.ReleaseDC(handle, hdcSrc);
Image img = Image.FromHbitmap(hBitmap);
ConvertTo32bpp(img, fileName);
img.Dispose();
GDI32Api.DeleteObject(hBitmap);
}
/// <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 static Image CaptureWindow(IntPtr handle)
{
// get te hDC of the target window
IntPtr hdcSrc = User32Api.GetWindowDC(handle);
// get the size
User32Api.RECT windowRect = new User32Api.RECT();
User32Api.GetClientRect(handle, ref windowRect);
int width = windowRect.right - windowRect.left;
int height = windowRect.bottom - windowRect.top;
// create a device context we can copy to
IntPtr hdcDest = GDI32Api.CreateCompatibleDC(hdcSrc);
// create a bitmap we can copy it to,
// using GetDeviceCaps to get the width/height
IntPtr hBitmap = GDI32Api.CreateCompatibleBitmap(hdcSrc, width, height);
// select the bitmap object
IntPtr hOld = GDI32Api.SelectObject(hdcDest, hBitmap);
// bitblt over
GDI32Api.BitBlt(hdcDest, 0, 0, width, height, hdcSrc, 0, 0, GDI32Api.SRCCOPY);
// restore selection
GDI32Api.SelectObject(hdcDest, hOld);
// clean up
GDI32Api.DeleteDC(hdcDest);
User32Api.ReleaseDC(handle, hdcSrc);
// get a .NET image object for it
Image img = Image.FromHbitmap(hBitmap);
// free up the Bitmap object
GDI32Api.DeleteObject(hBitmap);
return(img);
}
