} // end method Control
/// <summary>
/// Captures the specified area of the control or whats underneath
/// the control. If the argument flag client is true, only the client
/// area of the control is captured, otherwise the entire control is
/// captured. If the argument flag under is true, the capture area under
/// the control is captured, otherwise the specified area on the control
/// is captured.
/// </summary>
/// <param name="ctl">Control to capture</param>
/// <param name="client">If true capture only client area else entire control.</param>
/// <param name="under">If true capture specified area underneath the control else whats on the control.</param>
/// <returns>bitmap image of the control or whats underneath the control</returns>
public static Bitmap Control(System.Windows.Forms.Control ctl, bool client, bool under)
{
Bitmap bmp; // capture bitmap
Rectangle ctlR; // capture area rectangle in control coordinates
Rectangle scrR; // capture area rectangle in screen coordinates
// get capture rectangle in control
// coordinates and in screen coordinates
if (client) // if capturing client area
{
ctlR = ctl.ClientRectangle; // get rectangle in control coordinates
scrR = ctl.RectangleToScreen(ctlR); // get rectangle in screen coordinates
}
else // if capturing entire control
{
scrR = ctl.Bounds; // get rectangle in parent coordinates
if (ctl.Parent != null) // if parent exists
{
scrR = ctl.Parent.RectangleToScreen(scrR); // map to screen coordinates
}
ctlR = ctl.RectangleToClient(scrR); // get rectangle in control coordinates
}
// capture an area under the control
if (under) // if capture area is under control
{
bool prvV = ctl.Visible; // save control visibility
if (prvV) // if control visible
{
ctl.Visible = false; // make control invisible
Thread.Sleep(m_HDelay); // allow time for control to become invisible
// prior to image capture
}
// Capture the bitmap using desktop window handle and screen coordinates
// for the capture area. Note, the control window handle can NOT be used
// for capturing an area under the control.
IntPtr desktopHWND = USER32.GetDesktopWindow(); // get window handle for desktop
bmp = Window(desktopHWND, scrR); // get bitmap for capture area under control
if (ctl.Visible != prvV) // if control visibility was changed
{
ctl.Visible = prvV; // restore previous visibility
}
}
// capture an area on the control
else // if capture area not under control
{
// Capture the bitmap using control window handle and control coordinates
// for capture area.
bmp = Window(ctl.Handle, ctlR); // get bitmap using control window handle
}
return(bmp); // return requested bitmap
} // end method Control
