ActiveX for VB -> Problem

[Hans-Thomas Götz]

I am developing an ActiveX-Control with Visual C++ ( i don't use ATL or
MFC ) for Visual Basic. I have only little experience with ActiveX-Controls
and no experience with VB. The ActiveX-Control-part works well with the
ActiveX-Control-Test-Container, but it hangs with VB if i add a
command-button to the form. The problem is, that when VB wants to save the
control it keeps calling the IPersistStreamInit::Save() function and it
doesn't stop. Here is how i implemented the IPersistStreamInit::Save()
function:

HRESULT STDMETHODCALLTYPE ImplIPersistStreamInit::Save( /* [unique][in] */
IStream *pStm, /* [in] */ BOOL fClearDirty )
{
char dummy[ 10 ] = { 0 };
ULONG NumBytesWritten = 0;

EDM_DebugMessage( "IPersistStreamInit-Interface: called Save." );

if ( pStm != NULL ) {
// actually write some dummy data to the stream
pStm -> Write( ( void* ) dummy, 10, &NumBytesWritten ); // write 10 bytes
AdviseHolder -> SendOnSave();
} else {
return( E_UNEXPECTED );
}

AdviseHolder -> SendOnSave();

return( S_OK );
}

What am i doing wrong? Is there some documentation like "Programming
ActiveX-Controls for Visual Basic in C++" What are the equirements a
ActiveX-Control must meet to work with VB. Because it works with the
Testcontainer i assume that i have to meet some special requirements for VB.

Thanks in advance for the help.

Thomas

[Hans-Thomas Götz]

Last thing i discovered is that vb doesn't create an advisory connection:
"AdviseHolder -> SendOnSave()" does nothing at all!!! Well, that may be the
problem about the saving, but why doesn't vb create an advisoryx
connection???

Thanks for the help.

Thomas

"Hans-Thomas Götz" <htg...@web.de> schrieb im Newsbeitrag
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[Eric Sassaman [MS]]

Hans-Thomas, please note that Microsoft is not monitoring this newsgroup any
longer. This newsgroup may be deleted at a future date.

We highly recommend you post to microsoft.public.win32.programmer.ole
as the best place to discuss any COM or OLE programming issues. MSDN
managed newsgroup users need to post future questions there as well.
Thanks!

--
Eric Sassaman
Microsoft Support
This posting is provided AS IS with no warranties, and confers no rights.

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