Question

I need to develop a screen capture program that runs on Mac OS X Lion. I tried to make a screenshot using mono and GTK#, but the screenshot is black

Gdk.Window window = Gdk.Global.DefaultRootWindow;
if (window!=null)
{           
    Gdk.Pixbuf pixBuf = new Gdk.Pixbuf(Gdk.Colorspace.Rgb, false, 8, 
                                       window.Screen.Width, window.Screen.Height);          
    pixBuf.GetFromDrawable(window, Gdk.Colormap.System, 0, 0, 0, 0, 
                           window.Screen.Width, window.Screen.Height);          
    pixBuf.ScaleSimple(400, 300, Gdk.InterpType.Bilinear);
    pixBuf.Save("screenshot0.jpeg", "jpeg");
}

Can you point me in right direction. Preferably using mono, but if will be java, c++ or objective c is also good.
Thank in advance.

Answer 1

For Java, see Robot.createScreenCapture(Rectangle). Note though, that Robot commonly also produces a black screen image for apps. that take direct control of the screen area (e.g. many games).