Thanks for the tip on stderr/stdout. Never came across that before, but I haven't tried to port legacy code this way before either.

Well, for various reasons I can't get it to work on Linux well enough to even compile (legacy code issues).

I did try replacing stderr, stdout but that didn't work either. (And I've done that in the past and had it work too, but not under Qt.)

So I finally broke down and replaced all the printf/fprintf(stderr) calls with a new function that converts the stuff to QString, and then calls qDebug(), which is then captured via a handler to be redirected to the GUI location I want it to go.

Problem is that the _vsnprintf() in VS2008/Qt4.5.1 seems to be borked - it never prints the text to the buffer, despite having a 32k buffer and data that is no where near 32k in size (likely 80 characters in size at most). It does set the buffer to all spaces, with proper termination; but no data.

I originally pulled some code I had written to add 'printf()' style formatting to the std::string class that managed some dynamic memory to do the conversion with _vsnprintf(), but it just kept allocating memory and never actually writing anything. (And I know the function worked when I wrote and tested it!)

So needless to say, I have to go on to other things for now, but I really want to resolve this issue - and I'm just plain out of ideas right now.