SendMessage函数与MSDN系统预定义消息

SendMessage function

https://msdn.microsoft.com/en-us/library/windows/desktop/ms644950%28v=vs.85%29.aspx

系统预定义消息

https://msdn.microsoft.com/en-us/library/windows/desktop/ms644927%28v=vs.85%29.aspx#system_defined

 

使复选框按钮选中

#define BM_SETCHECK        0x00F1

#define BST_CHECKED        0x0001

SendMessage(hwnd, BM_SETCHECK, BST_CHECKED, 0);