DialogProc - Syntax

This is a window procedure that automatically subclasses each instance of a dialog box.

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

HWND       hwnd;       /*  Handle of the window to which the message applies. */
USHORT     usmsg;      /*  Message identity. */
MPARAM     mpParam1;   /*  Message parameter 1. */
MPARAM     mpParam2;   /*  Message parameter 2. */
MRESULT    mresReply;  /*  Message-return data. */

mresReply = DialogProc(hwnd, usmsg, mpParam1,
              mpParam2);