Platform SDK: Interprocess Communications |
The GetMsgProc function is an application-defined or library-defined callback function used with the SetWindowsHookEx function. The system calls this function whenever the GetMessage or PeekMessage function has retrieved a message from an application message queue. Before returning the retrieved message to the caller, the system passes the message to the hook procedure.
The HOOKPROC type defines a pointer to this callback function. GetMsgProc is a placeholder for the application-defined or library-defined function name.
LRESULT CALLBACK GetMsgProc( int code, // hook code WPARAM wParam, // removal option LPARAM lParam // message );
Value | Meaning |
---|---|
PM_NOREMOVE | Specifies that the message has not been removed from the queue. (An application called the PeekMessage function, specifying the PM_NOREMOVE flag.) |
PM_REMOVE | Specifies that the message has been removed from the queue. (An application called GetMessage, or it called the PeekMessage function, specifying the PM_REMOVE flag.) |
If nCode is less than zero, the hook procedure must return the value returned by CallNextHookEx.
If nCode is greater than or equal to zero, it is highly recommended that you call CallNextHookEx and return the value it returns; otherwise, other applications that have installed WH_GETMESSAGE hooks will not receive hook notifications and may behave incorrectly as a result. If the hook procedure does not call CallNextHookEx, the return value should be zero.
The GetMsgProc hook procedure can examine or modify the message. After the hook procedure returns control to the system, the GetMessage or PeekMessage function returns the message, along with any modifications, to the application that originally called it.
An application installs this hook procedure by specifying the WH_GETMESSAGE hook type and a pointer to the hook procedure in a call to the SetWindowsHookEx function.
Windows NT/2000: Requires Windows NT 3.1 or later.
Windows 95/98: Requires Windows 95 or later.
Header: Declared in Winuser.h; include Windows.h.
Hooks Overview, Hook Functions, CallNextHookEx, GetMessage, MSG, PeekMessage, SetWindowsHookEx