Processing the Window Activation Messages

L_VOID OnMDIActivate ( HWND hWnd, L_BOOL active, HWND hActivate, HWND hDeactivate ) 
{ 
   PAINTXFORM XForm ; 
   HDC hdcCompatibility ; 
   RECT rcDCRect ; 
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   /*set the painting toolkit data*/ 
   hdcCompatibility = GetDC ( hMDIChildWnd ) ; 
   L_PntSetMetrics ( pPaint, hdcCompatibility, MDIChildData.pBitmap, MDIChildData.hPalette ) ; 
   ReleaseDC ( hWnd, hdcCompatibility ) ; 
   XForm.nZoom    = MDIChildData.nZoomFactor ; 
   XForm.nXOffset = MDIChildData.nHscroll ; 
   XForm.nYOffset = MDIChildData.nVscroll ; 
   L_PntSetTransformation ( pPaint, &XForm ) ; 
   GetClientRect ( hMDIChildWnd, &rcDCRect ) ; 
   L_PntSetDCExtents ( pPaint, &rcDCRect ) ; 
   L_PntSetClipRgn (pPaint, MDIChildData.hClipRng ) ; 
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   . 
}