DefDlgProc

The DefDlgProc function allows to call the internal dialog callback function.

LONG_PTR WINAPI DefDlgProc(
  HANDLE hDlg,
  int    Msg,
  int    Param1,
  LONG_PTR Param2
);

hDlg

Dialog handle

Msg

One of the Dialog API messages or events.

Param1

The 1st parameter.

Param2

The 2nd parameter.

The return value depends on the Msg parameter.

A fragment from the Reversi game dialog callback proc:

LONG_PTR WINAPI ReversiDialogProc(HANDLE hDlg, int Msg,int Param1,LONG_PTR Param2)
{
  ...
  return Info.DefDlgProc(hDlg,Msg,Param1,Param2);
}