说明：  VB区域截图，获取鼠标拖动区域的图像，像QQ的截屏一样，程序保存图像格式是BMP，有需要其它格式的可自己查资料扩展吧，这里主要是想让大家知道如何编写截图程序
(VB regional screenshots, get the mouse to drag the image area, such as QQ, screenshots, a program to save the image format is BMP, there is need for other data formats can expand their search bar, where mainly wanted to let you know how to write a screenshot program)