COM : retrieve good CLSID

Question

I have a little problem with the CLSID.

I have a (hooked) function which has in param a REFCLSID. So I want to print this param.

I did:

LPOLESTR pOleStr;
StringFromCLSID(rclsid,&pOleStr); //rclsid is a REFCLSID type.
ofstream myfile;
myfile.open("C:\\output.txt",ios::app);
myfile << pOleStr << std::endl;
myfile.close();

But in "output.txt", I just have a 8 character string, but I should have a string like : 111111-2222-3333-4444-000000000000.

So if anyone has an idea...

Thanks.

What 8-character string do you get? – sharptooth Jul 11 '11 at 12:40 — sharptooth, Jul 11 '11 at 12:40
The pointer value. Just cast to (const wchar_t*). – Hans Passant Jul 11 '11 at 13:00 — Hans Passant, Jul 11 '11 at 13:00

score 1 · Accepted Answer · answered Jul 11 '11 at 12:41

1

Just a guess, I think that LPOLESTR is widechar, you'd have to convert it to ASCII using

CHAR  szCLSID[60];
WideCharToMultiByte(CP_ACP, 0, pOleStr, -1, szCLSID, 60, NULL, NULL);

Also don't forget to CoTaskMemFree(pOleStr) afterwards :)

answered Jul 11 '11 at 12:41

CharlesB

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COM : retrieve good CLSID

1 Answers1