public ChartArea(Control parent)
{
Parent = parent;
Left = 0;
Top = 0;
base.Height = 10;
base.Width = 10;
IntPtr hDC = WinApi.GetDC(Handle);
bDC = WinApi.CreateCompatibleDC(hDC);
bitmapGDI = WinApi.CreateCompatibleBitmap(hDC, Height, Width);
oldBitmap = WinApi.SelectObject(bDC, bitmapGDI);
WinApi.ReleaseDC(Handle, hDC);
}
public static Bitmap GetBitmapWindowClient(IntPtr handle)
{
try
{
// get te hDC of the target window
IntPtr hdcSrc = WinApi.GetWindowDC(handle);
// get the size
//RECT windowRect;
//WinApi.GetWindowRect(handle, out windowRect);
//int width = windowRect.Right - windowRect.Left;
//int height = windowRect.Bottom - windowRect.Top;
Rectangle rw = WinApi.GetWindowRectangle(handle);
Rectangle rc = WinApi.GetClientRectangle(handle);
int width = rc.Right - rc.Left;
int height = rc.Bottom - rc.Top;
// create a device context we can copy to
IntPtr hdcDest = WinApi.CreateCompatibleDC(hdcSrc);
// create a bitmap we can copy it to,
// using GetDeviceCaps to get the width/height
IntPtr hBitmap = WinApi.CreateCompatibleBitmap(hdcSrc, width, height);
// select the bitmap object
IntPtr hOld = WinApi.SelectObject(hdcDest, hBitmap);
// bitblt over
WinApi.BitBlt(hdcDest, 0, 0, width, height, hdcSrc, rc.X - rw.X, rc.Y - rw.Y, WinApi.SRCCOPY);
// restore selection
WinApi.SelectObject(hdcDest, hOld);
// clean up
WinApi.DeleteDC(hdcDest);
WinApi.ReleaseDC(handle, hdcSrc);
Bitmap bitmap = System.Drawing.Image.FromHbitmap(hBitmap);
// free up the Bitmap object
WinApi.DeleteObject(hBitmap);
return(bitmap);
}
catch (Exception)
{
return(null);
}
}