private static byte[] CopyBitmapToArray(int height, IntPtr targetDC, IntPtr compatibleBitmapHandle, out BITMAPINFO info)
{
info = GetBitmapInfo(targetDC, compatibleBitmapHandle);
//info.bmiHeader.biCompression = BitmapCompressionMode.BI_RGB;
info.bmiHeader.biHeight = -info.bmiHeader.biHeight;
var data = new byte[info.bmiHeader.biSizeImage];
int ret = Gdi32.GetDIBits(targetDC, compatibleBitmapHandle,
0,
(uint) height,
data,
ref info,
DIB_Color_Mode.DIB_RGB_COLORS);
Debug.Assert(ret == height);
info.bmiHeader.biHeight = -info.bmiHeader.biHeight;
return data;
}
public static extern int GetDIBits([In] IntPtr hdc, [In] IntPtr hbmp, uint uStartScan, uint cScanLines, [Out] byte[] lpvBits, ref BITMAPINFO lpbi, DIB_Color_Mode uUsage);
private static BITMAPINFO GetBitmapInfo(IntPtr targetDC, IntPtr compatibleBitmapHandle)
{
BITMAPINFO info;
info = new BITMAPINFO
{
bmiHeader =
{
biSize = (uint) Marshal.SizeOf(typeof (BITMAPINFOHEADER)),
}
};
int ret = Gdi32.GetDIBits(targetDC, compatibleBitmapHandle,
0,
0,
null,
ref info,
DIB_Color_Mode.DIB_RGB_COLORS);
Debug.Assert(ret != 0);
return info;
}
private void OnDataReceived(byte[] data, BITMAPINFO info)
{
const PixelFormat format = PixelFormat.Format32bppRgb;
var header = info.bmiHeader;
var width = header.biWidth;
var height = header.biHeight;
if (width == 0 || height == 0)
return;
var bitmap = new Bitmap(width, height, format);
try
{
var bitmapData = bitmap.LockBits(new Rectangle(0, 0, width, height),
ImageLockMode.WriteOnly,
format);
try
{
Marshal.Copy(data, 0, bitmapData.Scan0, (int) header.biSizeImage);
}
finally
{
bitmap.UnlockBits(bitmapData);
}
}
catch (Exception)
{
bitmap.Dispose();
throw;
}
if (_bitmap != null)
_bitmap.Dispose();
_bitmap = bitmap;
Invalidate();
}
private byte[] CaptureWindow(int x, int y, int width, int height, out BITMAPINFO info)
{
IntPtr sourceDC = IntPtr.Zero;
IntPtr targetDC = IntPtr.Zero;
IntPtr compatibleBitmapHandle = IntPtr.Zero;
try
{
sourceDC = User32.GetDC(_hWnd);
targetDC = Gdi32.CreateCompatibleDC(sourceDC);
compatibleBitmapHandle = Gdi32.CreateCompatibleBitmap(sourceDC, width, height);
IntPtr oldObject = Gdi32.SelectObject(targetDC, compatibleBitmapHandle);
Gdi32.BitBlt(targetDC, 0, 0, width, height, sourceDC, x, y, Gdi32.SRCCOPY);
Gdi32.SelectObject(targetDC, oldObject);
var data = CopyBitmapToArray(height, targetDC, compatibleBitmapHandle, out info);
return data;
}
finally
{
bool ret = Gdi32.DeleteObject(compatibleBitmapHandle);
Debug.Assert(ret);
ret = User32.ReleaseDC(_hWnd, sourceDC);
Debug.Assert(ret);
ret = Gdi32.DeleteDC(targetDC);
Debug.Assert(ret);
}
}
