捕获虚拟屏幕（所有显示器） [英] Capturing virtual screen (all monitors)

问题描述

我试图让整个虚拟屏幕的截图。这意味着，不只是在主屏幕的图像，但连接到电脑的每个屏幕。

有没有办法做到这一点？我试着用这一点，但它没有工作：

 位图B =新位图（SystemInformation.VirtualScreen.Width，SystemInformation。 VirtualScreen.Height）; 
图形G = Graphics.FromImage（B）; 
 this.Size =新的大小（SystemInformation.VirtualScreen.Width，SystemInformation.VirtualScreen.Height）; 
 g.CopyFromScreen（0，0，0，0，b.Size）; // MSDN：
  

解决方案

的文档说： Graphics.CopyFromScreen（的Int32，的Int32，的Int32， INT32，大小）：执行颜色数据位块传输，对应像素的长方形，从屏幕到Graphics的绘图图面不过。虚拟屏幕不一定是矩形：想象两台显示器具有1920×1200和1280×1024的分辨率所以，你需要做的就是创建一个位图就像你，然后列举你的显示器和执行 CopyFromScreen（）为他们每个人

修改如果，例如，你有两个显示器，具有1280×1024的分辨率站在一个的的离开 1920x1200的一个，那么前者的坐标是（-1280,0） - （0，1024）因此，你需要执行 memoryGraphics.CopyFromScreen（ - 1280，0，0，0，S）; 其中s是尺寸（1280,1024）。对于第二个你需要调用 memoryGraphics.CopyFromScreen（0，0，* 1280 *，0，S）; 和s将是尺寸（1920，1200）。
希望这有助于。

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);

解决方案

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.

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