Hi i have a problem in my COM ATL Programming. (I m writing OCX file for VB) can i have a function return multiple value? Let say i have function named CalcVariance(a,avg,var) which takes in 3 arguments and it is supposed to return the value of avg and var. so in the idl file, i wrote [id(19), helpstring("method CalcVariance")] HRESULT CalcVariance([in]vObjFeatures vFeature, [out]double* pAvg,[out]double* pVar); Hence, did i declare the right thing? in Vb i call using this way: Dim nAvg,nVar as double VsBlobObject1.FeatureVariance i, nAvg, nVar But the VB code couldn''t execute the function as it gave me "Type Mismatch" error code. so can anyone teach me how to write this function.... from damian

the "vObjFeatures" is the enum value. integer type.

this variable doesn;t give me the error.

Ouuuppps...sorry..it is typo mistake.

It should be
in Vb i call using this way:
Dim nAvg,nVar as double
VsBlobObject1.CalcVariance i, nAvg, nVar


thanks