Re: [Mingw-users] How to redirect the printf in a GUI program under GDB

[Tor L. <tm...@ik...>]

> Is there any method to let the printf output *redirect* to GDB console?

There are two ways:

- Change your executable into a console executable. Either relink it
without the -mwindows switch or run some suitable tool on the .exe
file that changes the header field in question. (Yes, it is just a
single header field that says whether an .exe is "console" or "gui".)
The only such tool I know off-hand is editbin.exe (part of MSVC,
presumably also present in the no-cost "express" edition), but as such
it is a relatively trivial task and would require not much code at
all.

- Add code to attach the parent process console:
AttachConsole(ATTACH_PARENT_PROCESS). After this you probably need to
do freopen("CONOUT$", "w", stdout). (I am too lazy to actually test
right now.) And you probably should first check if stdout currently
actually is attached to an invalid handle before redirecting it with
freopen, so that your program won't keep printing to the console even
if run with stdout redirected with ">" or a pipe.

--tml