The component supports the office automation. You can get the current show position.

long nPos = OA1.ActiveDocument.SlideShowWindow.View.GetCurrentShowPosition()

long nCount = OA1.SlideGetCount()

if(nPos == nCount)
do…

helpstring(“Exits the slide show play window.”)
HRESULT SlideShowExit();

helpstring(“Goes to the first slide in the opened PowerPoint file.”)
HRESULT SlideGotoFirst();

helpstring(“Goes to the previous slide in the opened PowerPoint file.”)
HRESULT SlideGotoPrevious();

helpstring(“Goes to the next slide in the opened PowerPoint file.”)
HRESULT SlideGotoNext();

helpstring(“Goes to the last slide in the opened PowerPoint file.”)
HRESULT SlideGotoLast();

helpstring(“Goes to the specified slide in the opened PowerPoint file based on the index.”)
HRESULT SlideGotoPage(long nPage);

helpstring(“Returns the count of slides.”)
HRESULT SlideGetCount([out,retval] long* nCount);