typedef unsigned long DWORD;
typedef int BOOL;
typedef unsigned char BYTE;
typedef float FLOAT;
typedef unsigned int UINT;
typedef struct tagMSG{
HWND hwnd;//h 是类型描述,表示句柄, Wnd 是变量对象描述,表示窗口,所以hWnd 表示窗口句柄
UINT message;//消息响应机制
WPARAM wParam;
LPARAM lParam;
DWORD time;
POINT pt;
};