消息类型

消息的产生

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消息的处理过程

MSG

typedef struct tagMSG {  
HWND hwnd;  //Handle to the window whose window procedure receives the message. //消息是基于句柄的

UINT message; //Specifies the message identifier.//消息是什么样的呢 

WPARAM wParam; //Specifies additional information about the message. The exact meaning depends on the value of the message member. 

LPARAM lParam; //Specifies additional information about the message. The exact meaning depends on the value of the message member. 
  
DWORD time;   //Specifies the time at which the message was posted. //消息什么时候产生的
 
POINT pt;//Specifies the cursor position, in screen coordinates, when the message was posted. 

 } MSG;