I'm trying to add an DrawMark event handler to my code

I was guessing the ON_EVENT macro should look something like

ON_EVENT(CMapDiagramView, IDC_FLOWCHARTX, 89, OnDrawMark, VTS_I4 VTS_I4 VTS_I4 VTS_DISPATCH VTS_DISPATCH VTS_I4 )
 

with as corresponding method

afx_msg void OnDrawMark( LONG *hdc,
				     LONG docX, LONG docY,
				     LPDISPATCH node, LPDISPATCH aPattern,
				     LONG anchorIndex );
 

sadly this doesn't work, and when I inspect the event in the debugger I see 6 parameters

VTS_I4 (0) VTS_DISPATCH (??) VTS_DISPATCH (??) VTS_I4 (106) VTS_I4 (271) ??

which would suggest the sequence is
hdc, node, aPattern, x, y, ?

Is there maybe a mistake in the documentation, or am I making a mistake ?

with kind regards,
Remko

The event is declared like this in the IDL:

HRESULT DrawMark([in]LONG* hdc, [in] LONG docX, [in] LONG docY,[in] LPDISPATCH node, [in] IAnchorPattern* aPattern, [in] LONG anchorIndex);

To be complete, the second VTS_DISPATCH should be a VTS_UNKNOWN

ON_EVENT(CMapDiagramView, IDC_FLOWCHARTX, 89, OnDrawMark, VTS_PI4 VTS_I4 VTS_I4 VTS_DISPATCH  VTS_UNKNOWN VTS_I4 ) 

The LPUNKNOWN can than be narrowed to an IAnchorPattern * using QueryInterface

There may be a simpler way to implement this, but for now it works like a charm