I'm early binding to a COM component, calling a method with the following
IDL:
HRESULT MethodName(
[in] BSTR Parameter1,
[in] BSTR Parameter2,
[out, retval] VARIANT* ReturnParameter);
When I call this I get the following exception message:
"An unhandled exception of type
'System.Runtime.InteropServices.SafeArrayTypeMismatchException' occurred in
...
Additional information: Specified array was not of the expected type."
I've had some help debugging this, and it gets into the C++ code with the
correct parameters, and successfully
gets through all the method, and only bombs on its return.
The IL for the interop-wrapper looks like this:
.method public hidebysig newslot virtual
instance object
marshal( struct)
MethodName([in] string marshal( bstr) Parameter1,
[in] string marshal( bstr) Parameter2) runtime
managed internalcall
{
.custom instance void
[mscorlib]System.Runtime.InteropServices.DispIdAttribute::.ctor(int32) = (
01 00 07 00 02 60 00 00 ) // .....`..
.override ProgId::MethodName
} // end of method
apparently the variant returned is a VT_ARRAY | VT_I1 (although I don't
quite know what this means!).
any ideas?
You can read messages from the DOTNET archive, unsubscribe from DOTNET, or
subscribe to other DevelopMentor lists at http://discuss.develop.com.
