x11 screen_capture

对整个屏幕进行截图。

1. 创建吗一个和当前屏幕一样大的窗口

       int width = DisplayWidth(display,screen_num), height = DisplayHeight(display,screen_num);
   
       Window window = XCreateSimpleWindow(display, RootWindow(display, screen_num), 0, 0, width, height, 1, 0, 0);
   

2. 获取窗体截图

       XImage *ximage = XGetImage(display,RootWindow(display,screen_num),0,0,width,height,XAllPlanes(),ZPixmap);
   

3. 展示截图

           		XPutImage(display, window, DefaultGC(display, screen_num), ximage, 0, 0, 0, 0, width, height);