[C++-sig] How to capture stdout/stderr?

[Peter]

Thanks Bert, that put on hopefully the right track to do the same thing
in C++.  I can almost do it completely, and I'll detail the code in
another email.

Thanks,
Peter


> 
> Here is my, considerably low-tech, code :
> 
> At init time,
> 
> -----------
> const std::string CatchOutput =
>          "class StdoutCatcher:\n"
>          "\tdef __init__(self):\n"
>          "\t\tself.data = ''\n"
>          "\tdef write(self, stuff):\n"
>          "\t\tself.data = self.data + stuff\n"
>          "\n"
>          "import sys\n"
>          "TheStdoutCatcher = StdoutCatcher()\n"
>          "sys.stdout = TheStdoutCatcher\n";
> 
> Run (CatchOutput);      // thin wrapper to run a snippet
> -----------
> 
> and then after some python code has run :
> 
> -----------
> using namespace boost::python;
> object Catcher (main_namespace ["TheStdoutCatcher"]);
> object CatcherData (borrowed (PyObject_GetAttrString (Catcher.ptr (), 
> "data")));
> 
> const std::string &S = extract<std::string>(CatcherData);
> Output += S;    // some log string
> Run ("sys.stdout.data=''\n");
> -----------
> 
> Note I'm pretty new at this, so the only warranty is
> "the above didn't crash so far" :)  Now that I paste
> it, I'm not sure about that const ref to the result of
> extract.
> 
> 
> hth,
> bert
> 
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