stream object

[MKC002]

A function takes stream as input argument functionname(LPUNKNOWN pStream) I have character array and i need to use that function. How should i convert my array to LPUNKNOWN pStream

[Mohan Ramachandra]

Typecast..

char arrc[10];
functionName((LPUNKNOWN) arrc);

[MKC002]

I TRIED THE SAME BUT WHEN I CALL FUNCTION IT GIVES EXCEPTION.

[Cedric Moonen]

LPUNKNOWN is a pointer to a IUnknown interface (a COM object). You can't simply cast your string like that...

Cédric Moonen Software developer
Charting control [v3.0] OpenGL game tutorial in C++

[Cedric Moonen]

LPUNKNOWN is a pointer to a IUnknown interface, which is a COM object. What are you trying to do exactly ? This is not the way you are supposed to work with the function. What is this function exactly ?

Cédric Moonen Software developer
Charting control [v3.0] OpenGL game tutorial in C++

[Lost User]

See here[^], I assume that the function requires a STD stream pointer.

It's time for a new signature.

[Eugen Podsypalnikov]

You could try the following :) :

{
char chBuffer[] = "1234567890";
COleStreamFile cFile;
if (cFile.CreateMemoryStream()) {
cFile.Write(chBuffer, _countof(chFuffer));
// Assumed the function "functionname" destroys the passed (IStream*)
functionname(cFile.Detach());
}
} // Note: ~COleStreamFile() does not destroy the above detached stream

virtual void BeHappy() = 0;