COM: Create VT_ARRAY with VT_BSTR values

Question

I am new to COM, and I think I have it right, but the runtime is not like it. Any help is greatly appreciated.

I need to call a COM function that takes a one-dimensional BSTR array. In particular, the documentation states that the parameter should be:

Function: AddFiles ([in] VARIANT * filePaths)

filePaths A single array of full paths to each file or folder. filePaths can be of type VT_ARRAY|VT_VARIANTwhere each entry is VT_BSTRor VT_ARRAY|VT_BSTR.

I have vector<wstring> myPathspaths that I want to pass to a function that takes the parameter above. Here is the code I wrote. Calling AddFiles on myComObject results in AV (myComObject is not null, and I can call other methods on it):

        ...
        VARIANT filePaths;
        VariantInit( &filePaths );
        filePaths.vt = VT_ARRAY|VT_VARIANT;
        filePaths.parray = SafeArrayCreateVector( VT_BSTR, 0, (unsigned int) myPaths.size() );

        long i = 0;
        for( vector<wstring>::iterator it = myPaths.begin();
            it != myPaths.end();
            it++, i++ )
        {
            BSTR myPath= SysAllocString(it->c_str());
            SafeArrayPutElement( filePaths.parray, &i, myPath);
        }

        myComObject->AddFiles( &filePaths );
        ...

COM- , , , - AddFiles , , - ?

Answer 1

myComObject- > AddFiles VT_ARRAY | VT_VARIANT, .

VARIANT myPath;
VariantInit(&myPath);

myPath.vt = VT_BSTR;
myPath.bstrVal = SysAllocString(it->c_str());

SafeArrayPutElement(filePaths.parray, &i, &myPath);

Answer 2

:

filePaths.vt = VT_ARRAY|VT_BSTR;

SafeArray BSTR?