Getting output from embedded python program

[Kim]

Hi Rich, 
You post is extremely useful. However when I tried to run the
expression in My Module's context, instead of __main__ module. It
always retunns NULL. How can I do that? I tried PyRun_String().. but
didn't work. i don't really understand global and local arguments in
PyRun_String(), token is set to 0?

THanks very much !
Kim

> ...
> PyObject* evalModule;
> PyObject* evalDict;
> PyObject* evalVal;
> char* retString;
> 
> PyRun_SimpleString( "result = 'foo' + 'bar'" )
> 
> evalModule = PyImport_AddModule( (char*)"__main__" );
> evalDict = PyModule_GetDict( evalModule );
> evalVal = PyDict_GetItemString( evalDict, "result" );
> 
> if( evalVal == NULL ) {
>      PyErr_Print();
>      exit( 1 );
> 
> } else {
>      /*
>       * PyString_AsString returns char* repr of PyObject, which should
>       * not be modified in any way...this should probably be copied for
>       * safety
>       */
>      retString = PyString_AsString( evalVal );
> }
> ...
> 
>     In this case, you need to know that the expression will evaluate to 
> a string result in order to call PyString_AsString().  If you don't know 
> this, you will have to check the type of the PyObject first.