MSG

Message Data Structure

The MSG structure contains information from the Windows application queue.

typedef struct tagMSG {

HWND hwnd;

WORD message;

WORD wParam;

LONG lParam;

DWORD time;

POINT pt;

} MSG;

The MSG structure has the following fields:

Field Description  
hwnd Identifies the window that receives the message.  
message Specifies the message number.  
wParam Specifies additional information about the message. The exact meaning depends on the message value.  
lParam Specifies additional information about the message. The exact meaning depends on the message value.  
time Specifies the time at which the message was posted.  
pt Specifies the position of the cursor (in screen coordinates) when the message was posted.