C# Signature:
[DllImport("ole32.dll")]
static extern int OleDraw([MarshalAs(UnmanagedType.IUnknown)] object pUnk,
uint dwAspect, IntPtr hdcDraw, [In] ref RECT lprcBounds);
User-Defined Types:
None.
Notes:
None.
Tips & Tricks:
Please add some!
Sample Code:
[DllImport("ole32.dll")]
public static extern int OleDraw(IntPtr pUnk, int dwAspect, IntPtr hdcDraw, ref Rectangle lprcBounds);
/// <summary>
/// Creates a bitmap from the supplied ActiveX control using OleDraw
/// </summary>
/// <param name="c"></param>
public Image CreateImage(AxHost c)
{
Rectangle rect = new Rectangle(0,
0,
c.ClientRectangle.Width,
c.ClientRectangle.Height);
Bitmap bmp = new Bitmap(rect.Width, rect.Height);
Graphics graphics = Graphics.FromImage(bmp);
IntPtr pUnk = Marshal.GetIUnknownForObject(c.GetOcx());
IntPtr hdc = graphics.GetHdc();
OleDraw(pUnk, 1, hdc, ref rect);
Marshal.Release(pUnk);
graphics.ReleaseHdc(hdc);
return bmp;
}
Alternative Managed API:
Do you know one? Please contribute it!
