The MSG structure contains message information from a thread's message queue.

Syntax

typedef struct {
    HWND hwnd;
    UINT message;
    WPARAM wParam;
    LPARAM lParam;
    DWORD time;
    POINT pt;
} MSG, *PMSG;

Members

hwnd

Handle to the window whose window procedure receives the message. hwnd is NULL when the message is a thread message.

message

Specifies the message identifier. Applications can only use the low word; the high word is reserved by the system.

wParam

Specifies additional information about the message. The exact meaning depends on the value of the message member.

lParam

Specifies additional information about the message. The exact meaning depends on the value of the message member.

time

Specifies the time at which the message was posted.

pt

Specifies the cursor position, in screen coordinates, when the message was posted.

Structure Information

Header	Declared in Winuser.h, include Windows.h
Minimum operating systems	Windows 95, Windows NT 3.1

See Also

Messages and Message Queues Overview, GetMessage, PeekMessage, PostThreadMessage