typedef struct tagMSG { /* msg */
HWND hwnd;
UINT message;
WPARAM wParam;
LPARAM lParam;
DWORD time;
POINT pt;
} MSG;
The MSG structure contains information from the Windows application queue.
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.