qDebug() under Windows

[jlbrd]

Hello,

When a program is built in debug mode, qDebug() writes to stderr under Linux and Windows. In Release mode, under Linux qDebug() writes to stderr but under Windows the messages seems lost.
My question is how to write to stderr under Windows in release mode and with MinGW compiler. The goal is to read the messages when the program is launched in a QProcess.

[e8johan]

In windows you need to add the line "CONFIG += console" to you pro-file to get qDebug to work. This is because windows applications do not have stdin/out/err setup by default.

[Antrax]

why not use fprintf(stderr, "...")?

[wysota]

why not use fprintf(stderr, "...")?

It won't help without supporting the console. Using qDebug() for transfering actual data is a strange thing anyway. I'd suggest using cout or cerr instead and leave qDebug for debugging.

[jlbrd]

Thank you,

Indeed with console added to CONFIG variable, qQebug() wrote to output debug in QDevelop under Windows on Release mode. Only small default: If the application is on Debug mode and have console added, when the application is launched, a terminal is opened and the messages are written in it. But the goal is reached, thank you.

[igor_x]

and what to do, when i got error in
"MAKE -f makefile.debug" (CONFIG += console in pro file)

--
debug\mainwindow.o debug\moc_detailsdialog.o debug\moc_mainwindow.o -L"c:\Qt\4.2.0\lib" -
lQtGuid4 -lQtCored4
/mingw/lib/libmingw32.a(main.o)(.text+0x106):main.c: undefined reference to `WinMain@16'
collect2: ld returned 1 exit status
mingw32-make[1]: *** [debug\printform.exe] Error 1
mingw32-make[1]: Leaving directory `C:/Qt/progi/printform'
mingw32-make: *** [debug] Error 2
--
thanks!
Igor

[wysota]

"make clean" your project. And be sure to run qmake after modifying the project file.

[Bob Wilson]

You may view the qDebug messages using Debug View:

http://www.microsoft.com/technet/sys...debugview.mspx

You start it up in a separate window... can use when executing within QDevelop
or outside...

You can view the qDebug(...) messages without having to change your config...
DebugView was avail from sysinternal.com but Microsoft bought them...

When MS sees QDevelop... they will probably try to buy it!!!

I am not a Microsoft fan, but since someone else wrote it......

[Arigreen]

I'm having trouble getting qDebug to output anything when using MacOs. I added CONFIG += console to my .pro file but am still unable to read any debug output. Any ideas?

Thanks,
Ari

[sunil.thaha]

Try

config -= app_bundle   # enable the qDebug() in mac

config -= app_bundle   # enable the qDebug() in mac

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[Arigreen]

Yep, that worked! Thanks a lot!

Ari