[Win32 API] MSG Structure
Contain message information from a thread's message queue. Syntax typedef struct tagMSG { HWND hwnd; UINT message; WPARAM wParam; LPARAM lParam; DWORD time; POINT pt; } MSG, *PMSG, *LPMSG; Members hwnd : A handle to the window whose window procedure receives the message. This member is NULL when the message is a thread message. message : The message identifier.Applications can only use the low word; the high word is reserved by system. wParam : additional information about the message.The exact meaning depends on the value of the message member. lParam : additional information about the message.The exact meaning depends on the value of the message member. time : The time at which the message was posted. pt : The cursur position,in screen coordinates, when the message was posted.