public static byte[] CaptureRectangle(Rectangle r)
{
IntPtr wndHWND, wndHDC, capHDC, capBMP, prvHDC;
wndHWND = wndHDC = capHDC = capBMP = prvHDC = IntPtr.Zero;
byte[] buffer = null;
Point cursorPos = Point.Empty;
try
{
wndHWND = NativeMethod.GetDesktopWindow(); // window handle for desktop
int x, y, width, height;
x = r.X;
y = r.Y;
width = r.Width;
height = r.Height;
wndHDC = NativeMethod.GetDC(wndHWND); // get context for window
// create compatibile capture context and bitmap
capHDC = NativeMethod.CreateCompatibleDC(wndHDC);
capBMP = NativeMethod.CreateCompatibleBitmap(wndHDC, width, height);
// make sure bitmap non-zero
if (capBMP == IntPtr.Zero) // if no compatible bitmap
{
NativeMethod.ReleaseDC(wndHWND, wndHDC); // release window context
NativeMethod.DeleteDC(capHDC); // delete capture context
throw new Exception("Not create compatible bitmap.");
}
// select compatible bitmap in compatible context
// copy window context to compatible context
// select previous bitmap back into compatible context
prvHDC = (IntPtr)NativeMethod.SelectObject(capHDC, capBMP);
//NativeMethod.BitBlt(capHDC, 0, 0, width, height, wndHDC, x, y, RasterOp.SRCCOPY | RasterOp.CAPTUREBLT);
NativeMethod.BitBlt(capHDC, 0, 0, width, height, wndHDC, x, y, RasterOp.SRCCOPY);
NativeMethod.GetCursorPos(out cursorPos);
cursorPos.X -= r.Left;
cursorPos.Y -= r.Top;
// Draw the cursor
// Always wait cursor, why? So use arrow cursor forever.
//IntPtr hcur = GetCursor();
IntPtr hcur = NativeMethod.GetCurrentCursorHandle();
IconInfo iconInfo = new IconInfo();
int hr = NativeMethod.GetIconInfo(hcur, out iconInfo);
if (hr != 0)
{
cursorPos.X -= iconInfo.xHotspot;
cursorPos.Y -= iconInfo.yHotspot;
if (iconInfo.hbmMask != IntPtr.Zero)
{
NativeMethod.DeleteObject(iconInfo.hbmMask);
}
if (iconInfo.hbmColor != IntPtr.Zero)
{
NativeMethod.DeleteObject(iconInfo.hbmColor);
}
}
NativeMethod.DrawIcon(capHDC, cursorPos.X, cursorPos.Y, hcur);
NativeMethod.SelectObject(capHDC, prvHDC);
// create GDI+ bitmap for window
Bitmap bitmap = Image.FromHbitmap(capBMP);
Bitmap b = ImageUtil.AnyBitmapToBitmap24(bitmap);
bitmap.Dispose();
bitmap = b;
buffer = ImageUtil.BitmapToByte(bitmap);
//buffer = ImageUtil.BitmapToByteEx(bitmap);
bitmap.Dispose();
}
catch (Exception)
{
}
finally
{
// release window and capture resources
NativeMethod.DeleteObject(capBMP); // delete capture bitmap
NativeMethod.DeleteDC(capHDC); // delete capture context
NativeMethod.ReleaseDC(wndHWND, wndHDC); // release window context
}
return(buffer);
}
