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Hi Steve,
When I call an RPG procedure which has *nopass parms from ILE C how do I pass the %parms count to the called procedure?
To make ILE C pass %PARMS to RPG, you need to define a minimal descriptor. RPG always passes a minimal descriptor. CL always passes the full descriptor. But, C doesn't do either unless you tell it to.
To tell C to pass a descriptor, use the descriptor pragma. For example: void MyRpgProc(int inparm, int *outparm); #pragma descriptor (void MyRpgProc(void,void) )The #pragma directive tells it to pass a descriptor. However, it won't pass it for either of the parameters, because I put "void" on the pragma for each parameter. So it'll only pass the parameter count with nothing else (that's what I mean when I say "minimal").
For more info, look up #pragma descriptor in the manuals :)
I am trying to switch to C++ and use function overloading but that means I cant use extern "C" on the function prototype. Without extern "C" I get a mangled name for each function overload. How do I map those different mangled names to the single exported procedure from the RPG module?
RPG doesn't understand overloading, and if it ever does, I have a feeling they won't use name mangling to accomplish it (just a guess, mind you).
If you wanted to write overloaded functions in RPG, you'd have to give them all different names. I suppose you COULD mangle the names manually so that C++ could use them as overloaded procs... but I'm not sure if it's a good idea.
Was this just an alternate approach to getting %PARMS to work? Or do you really need mangled names in RPG?
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