Getting output from embedded python program

[Roberto]

Hi there,

> http://elmer.sourceforge.net/PyCon04/elmer_pycon04.html ) ...obviously,
> if you evaluate a print statement, you will still get output on stdout

This tutorial is quite good!

The same thing can be done even with the py_runfile ??
I'm triyng to do such things with no result!

Bye,
Roberto


"Rick L. Ratzel" <rick.ratzel at magma-da.com> ha scritto nel messaggio
news:4084B179.6020807 at magma-da.com...
> Kim wrote:
> > Hi everyone,
> > I'm writing a embeded python program, and I want to evaluate some
> > expression by calling function:
> >
> > PyRun_SimpleString("print 'hello'")
> >
> > I don't want to output it to stdout but putting it into string somehow
> > sothat I can process it.
> >
>
>     Here is a way to get the result of a Python expression eval from C
> (derived from example at
> http://elmer.sourceforge.net/PyCon04/elmer_pycon04.html ) ...obviously,
> if you evaluate a print statement, you will still get output on stdout
> though:
>
> ...
> 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.
>
>
>