In a third party COM Module I have to pass a struct to a Method.
The important parts of the IDL definition look like this:
interface ITheirInterface : IDispatch {
[id(0x0000012d)]
HRESULT TheirMethod([in] TheirStruct Attributes);
};
struct TheirStruct {
BSTR TheirFieldA;
BSTR TheirFieldB;
} TheirStruct;
I how do I call the method from C++ using the ATL?
CComPtr<IDispatch> comPtr;
comPtr.CoCreateInstance(L"theirModule.TheirCoClass");
CComVariant returnValue;
CComVariant attribute= I_DO_NOT_KNOW_WHAT_TO_PLACE_HERE;
comPtr.Invoke1(T2COLE(L"TheirMethod"),&attribute,&returnValue);
COM automation support for structures is very weak, CComVariant doesn't support it directly. You need to use IRecordInfo and create a variant of type VT_RECORD. Obtain the IRecordInfo interface pointer from GetRecordInfoFromTypeInfo or GetRecordInfoFromGuids. Good luck.
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