Getting output from embedded python program

[Rick Ratzel]

    Thank you!  I have never used PyRun_File(), but from the docs it 
looks like it would work in a similar fashion (and may allow you to 
leave behind a file for debugging later).

    Like the presentation suggests, you might want to try Elmer for 
automatically generating a "native" C interface for a Python module.  I 
don't know the details of your project, but in most of my experiences it 
is nicer/easier than using the Python/C API directly.

Rick.


Roberto wrote:
> 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.
>>
>>
>>
> 
> 
>