[Python-Dev] embedding Python interpreter in non-console windows application

[Amaury Forgeot d'Arc]

Hi,

2010/2/17 stephen <stephen at blackroses.com>

> Hello,
>
> THE PROBLEM:
>   I am having a problem that I have seen asked quite a bit on the web, with
> little to no follow up.
> The problem is essentially this. When embedding (LoadLibraryA()) the python
> interpreter dll
> in a non-windows application the developer must first create a console for
> python to do output/input with.
> I properly initialize the CRT and AllocConsole() to do this. I then
> GetSTDHandle() for stdin and stdout accordingly
> and open those handles with the requisite flags "read" for STDIN and
> "write" for stdout. This all works great
> and is then verified and tested to work by printf() and fgets(). This issue
> however happens when attempting
> to PyRun_InteractiveLoop() and PyRun_SimpleString(). A
> PyRun_SimpleString("print 'test'") displays nothing in my
> freshly allocated console window. Similarly a PyRun_InteractiveLoop(stdin,
> NULL); yields nothing either even though
> the line printf("testing"); directly ahead of it works just fine. Does
> anyone have insight on how I can make this work
> with the freshly allocated console's stdin/stdout/stderr?
>
> SPECULATION:
> That is the question, so now on to the speculation. I suspect that
> something in the python runtime doesn't "get handles"
> correctly for STDIN and STDOUT upon initialization. I have perused the
> source code to find out exactly how this is done
> and I suspect that it starts in PyInitializeEx with calls to
> PySys_GetObject("stdin") and "stdout" accordingly. However I
> don't actually see where this translates into the Python runtime checking
> with the C-runtime for the "real" handles to STDIN and STDOUT. I dont ever
> see the Python runtime "ask the system" where his handles to STDIN and
> STDOUT are.
>

Are you using the same compiler as the one used to compile Python? It's
important that your program and python use the same C runtime library
(MSVCR90.dll for python 2.6), otherwise "stdout" refers to different things.

-- 
Amaury Forgeot d'Arc
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