基于Qt4下的截屏软件
　　使用了QPixmap::grabWindow(QApplication::desktop()->winId())来获得屏幕的图像
　　并保存在QPixmap的一个对象fullScreenMap里
　　再将该图像画到一个QWidget上并showFullScreen()以覆盖屏幕
　　之后的操作都是在这个QWidget上进行
　　跟QQ截图有点象
　　完成后点鼠标右键就有ContextMenu弹出
　　Esc为退出，空格键保存图像(当然也可以右键菜单保存)(Screen software based on Qt4
Using QPixmap:: grabWindow (QApplication:: desktop () ->winId ())) to get the image of the screen
And save it in an object fullScreenMap of the QPixmap
Then the image from a QWidget and showFullScreen () to cover the screen
The next operation is done on this QWidget
It's a bit like the QQ screenshot
After the completion of the right mouse button, there is a ContextMenu pop-up
Esc is the exit, the space key saves the image (and of course, it can be saved on the right menu))