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Passing a managed (C #) string [] to a COM library

Setup:
I have a COM DLL that calls a method inside a managed C # DLL. This function returns a C # string [] array that is bound to SAFEARRAY.

Problem:
When I try to access strings inside safairray, I only get the first char of the string. What am I doing wrong?

The code: 

    // Pointer to the managed interface
    DatabasePtr pODB(__uuidof(DBClass));

    // Get the string[] array from the managed method
    SAFEARRAY* safearray = pODB->GetStringArray();

    HRESULT hresult;

    long ubound;
    long lbound;

    hresult = SafeArrayGetUBound(safearray, 1, &ubound);
    hresult = SafeArrayGetLBound(safearray, 1, &lbound);

    long index;
    BSTR fromarray;

    for (; lbound <= ubound; lbound++)
    {
        index = lbound;

        hresult = SafeArrayGetElement(safearray, &index, (void*)&fromarray);

        char buffer[512];
        sprintf_s(buffer,"%s",fromarray);

        MessageBox(0, (LPCSTR)buffer, "...", 0);
    }

Thanks for your help,
-Sean!

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1 answer


BSTR is a unicode string, so you must use a buffer wchar_t

and wsprintf_s

. Right now, you are printing out the ANSI portion of the first Unicode character and then stop at \ 0. And please, please don't overflow (sic!). Use secure _vsnwprintf_s_l

and his family, your code is a hacking pleasure as it is now and you will be pwned. See http://msdn.microsoft.com/en-us/library/d3xd30zz(VS.80).aspx



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