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4/8/2010
The simplest use of IDispatch::Invokeis to call a method that does not have parameters. You only need to pass the DISPID of the method, a LCID, the DISPATCH_METHOD flag, and an empty DISPPARAMSstructure.
Most methods take one or more parameters. To invoke these methods, the DISPPARAMSstructure should be filled in, as described in Passing Parameters.
Automation defines special DISPIDs for invoking an object's Valueproperty (the default), and the members _ NewEnum, and Evaluate.