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一、窗口函数（Window） = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = AdjustWindowRect 函数功能：该函数依据所需客户矩形的大小，计算需要的窗日矩形的大小。计算出的窗口矩形随后可以传递给CreateWindow函数，用于创建一个客户区所需大小的窗口。 函数原型：BOOL AdjustWindowRect（LPRECT lpRect ，DWORD dwStyle，BOOL bMENU）； 参数： lpRect：指向RECT结构的指针，该结构包含所需客户区域的左上角和右下角的坐标。函数返回时，该结构容纳所需客户区域的窗口的左上角和右下角的坐标。