if( interp){
   LangClientMessage(winPtr->mainPtr->interp, (Tk_Window) winPtr,  eventPtr);
}

##</code><code>##

LangClientMessage(winPtr->mainPtr->interp, (Tk_Window) winPtr,  eventPtr);
 
##</code><code>##

 if (eventPtr && winPtr && winPtr->mainPtr) {
     LangClientMessage(winPtr->mainPtr->interp, (Tk_Window) winPtr,  eventPtr);
   }