WndProc - Syntax

This defines the window procedure provided by an application.

#define INCL_WINMESSAGEMGR /* Or use INCL_WIN, INCL_PM, Also in COMMON section */
#include <os2.h>

HWND       hwnd;       /*  Window handle. */
ULONG      msg;        /*  Message identity. */
MPARAM     mp1;        /*  Message parameter 1. */
MPARAM     mp2;        /*  Message parameter 2. */
MRESULT    mresReply;  /*  Message-return data. */

mresReply = WndProc(hwnd, msg, mp1, mp2);