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static HHOOK hHook = NULL;

static void CenterWindowOnParent( HWND hChildWnd )
{
   HWND hParent = GetParent( hChildWnd );
   RECT rcChild, rcParent;
   int cxChild, cyChild, cxParent, cyParent;

   GetWindowRect( hChildWnd, &rcChild );
   GetWindowRect( hParent, &rcParent );

   cxChild = rcChild.right - rcChild.left;
   cyChild = rcChild.bottom - rcChild.top;
   cxParent = rcParent.right - rcParent.left;
   cyParent = rcParent.bottom - rcParent.top;
   
   SetWindowPos( hChildWnd, NULL, 
               rcParent.left + ( cxParent - cxChild ) / 2, 
                 rcParent.top + ( cyParent - cyChild ) / 2, 0, 0, 0x15 );       
}

LRESULT CALLBACK MsgBoxHookProc( int nCode, WPARAM wParam, LPARAM lParam )
{
   if( nCode < 0 )  // do not process message 
        return CallNextHookEx( hHook, nCode, wParam, lParam ); 

   if( nCode == HCBT_ACTIVATE )
   {
      HWND hWndMsgBox = ( HWND ) wParam;    
      char cn[ 200 ];
            
      GetClassName( hWndMsgBox, cn, 199 );      

      if( cn[ 0 ] == '#' &&
          cn[ 1 ] == '3' &&
          cn[ 2 ] == '2' &&
          cn[ 3 ] == '7' &&
          cn[ 4 ] == '7' &&
          cn[ 5 ] == '0' &&
          cn[ 6 ] == 0 )
         CenterWindowOnParent( hWndMsgBox );            
   }        
    
   return 0; // allow normal processing
}

HINSTANCE GetInstance( void );

HB_FUNC( CENTERMSGS )
{
   hHook = SetWindowsHookEx( WH_CBT,  
                             MsgBoxHookProc, GetInstance(), 
                             GetCurrentThreadId() );
}

//------------------------------------------------------------------------//

HB_FUNC( UNHOOKWINDOWSHOOKEX )
{
   if( hHook )
   {    
      hb_retl( UnhookWindowsHookEx( hHook ) );
      hHook = NULL;
   }        
   else
      hb_retl( 0 ); 
}

//------------------------------------------------------------------------//