Capturing virtual screen (all monitors)

Question

I am trying to get a screenshot of the whole virtual screen. This means, an image of not just the primary screen, but every screen connected to the computer.

Is there a way to do that? I tried using this, but it didn't work:

Bitmap b = new Bitmap(SystemInformation.VirtualScreen.Width, SystemInformation.VirtualScreen.Height);
Graphics g = Graphics.FromImage(b);
this.Size = new Size(SystemInformation.VirtualScreen.Width, SystemInformation.VirtualScreen.Height);
g.CopyFromScreen(0, 0, 0, 0, b.Size);

Answer 1

The documentation says: Graphics.CopyFromScreen(Int32, Int32, Int32, Int32, Size): Performs a bit-block transfer of the color data, corresponding to a rectangle of pixels, from the screen to the drawing surface of the Graphics." But the virtual screen is not necessarily a rectangle: imagine two monitors with 1920x1200 and 1280x1024 resolutions. So what you need to do is create a bitmap like you do, then enumerate your monitors and execute CopyFromScreen() for each of them.

Edit: If, for instance, you have two monitors, the one having 1280x1024 resolution standing on the left of 1920x1200 one, then the coordinates of the former would be (-1280,0) - (0, 1024). Therefore you need to execute memoryGraphics.CopyFromScreen(-1280, 0, 0, 0, s); where s is the Size(1280,1024). For the second one you need to call memoryGraphics.CopyFromScreen(0, 0, *1280*, 0, s); and s would be the Size(1920, 1200). Hope this helps.