Mac OS X Lion上的屏幕截图程序，在其他操作系统上可移植

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 (eg many games).

Answer 2

Your best bet would probably be using a platform-specific API to do the actual image capture, while the rest of your app remains portable. For OS X, Apple actually provides sample code on how to do this, and your code will probably work under X11.