SilverScreen Solid Modeler

Making the entry point work

Making the entry point work

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Making the entry point work

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SilverPlusEllipse

 

Creating a SilverPlus entry point

 

Once a SilverPlus DLL has a framework that will allow it to be invoked from a SilverC stub, it is only necessary to make the DLL perform work. That can be achieved by letting a user-defined operation code  to the SilverPlus entry point trigger the work. A user-defined operation code is a code whose value is REX_USER_BASE or greater.

 

 

The skeleton we created for the entry point earlier in this chapter will be modified to perform work. Specifically, it will display a simple question, wait for an answer, and then exit. If the answer to the question was yes, then 1 will be returned and otherwise 0 will be returned.

 

C / C++ Code

 

 #include <windowsx.h>

 #include "silver2.h"

 

 . . .

 

 

 extern "C" __declspec(dllexport) int SilverCExec(int op, void *data)

    {

    int rval = 1;

 

    switch ( op )

       {

       . . .

 

       case REX_USER_BASE:

 

            // Perform stub-initiated work

            qmessage("Welcome to SilverPlus", 0, 0);

 

            if ( ! ask_yn("Is SilverPlus fun?") )

               rval = 0;

            break;

       }

 

    return rval;

    }

 

 

 

If you have been following the topics in this chapter in order, then you are at the point where you can create a SilverPlus DLL and make it perform a task using the SilverScreen API. The next topic in this chapter shows you how to create the SilverC stub necessary to load the DLL and make it perform the work.