Using Return Value of the Script Callback


To use the return value of the JScript Function we need to pass parameter VARIANT *pVarResult to the Invoke Method of the IDispatch.


 


Lets implement an adder that takes one integer as parameter and return the result as paramter + 1.


function adder(a)


{


    alert(“a = “ + a);


    return a + 1;


}


 


We have already seen how to pass a parameter using dispParams to JScript Function. Now we just need to define result variant to store the result and then invoke the Invoke on the dispatch.


VARIANT result;


 


Call to the invoke


m_disp->Invoke(


      DISPID_VALUE,


      IID_NULL,


      LOCALE_USER_DEFAULT,


      DISPATCH_METHOD,


      &dispParams,


      &result,


      NULL,


      NULL);


 


Attached code contains the complete adder code.

Adder.zip

Comments (1)

  1. Here are links to a virtual series written by Sheetal, one of the developers in the JScript team on Jscript