COM: Create a VT_ARRAY with VT_BSTR values

com

Solution

If myComObject->AddFiles can only deal with VT_ARRAY|VT_VARIANT, the following should work too.

VARIANT myPath;
VariantInit(&myPath);

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

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

Problem

I'm a COM newbie and I think what I have is correct, but the runtime doesn't like it. Any help is much appreciated. I need to invoke a COM function that takes in a single dimensional array of BSTRs. Specifically, the documentation says the parameter must be: Function: AddFiles ( [in] VARIANT * filePaths ) filePaths The single-dimensioned array of full paths to each file or folder. filePaths can be of type `VT_ARRAY|VT_VARIANT`, where each entry is a `VT_BSTR`, or `VT_ARRAY|VT_BSTR`. I have a `vector<wstring> myPaths` of paths which I want to pass into the function that takes the parameter above. Here's the code I wrote. Calling AddFiles on myComObject results in an AV (myComObject is not null, and I can invoke 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 ); ... ``` The COM object isn't my code and I can't debug into it, but I suspect I'm not creating that array properly - based on the requirement of the AddFiles function and the code I have, anyone have ideas about what I might be doing wrong?

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