Reading standard error from a process

[harden]

Hello Qt developers! I have the following problem, hope you'll be able to help me.

From my Qt app I run a QProcess - an application, which normally prints some messages to a console screen. I want to capture these messages in my app using readAllStandardError(), but it gives no result. It eventually appears, but only after i call terminate() on a QProcess, when cumulated messages appear at once.

What should I do to see the messages just as they are printed?

[stampede]

an application, which normally prints some messages to a console screen.
Probably messages are buffered, try to flush the std error output in this application ( fflush(stderr), this was posted few times on the forum ).

[cincirin]

And if you want to capture real-time messages, connect your slot to QProcess::readyReadStandardError.

[harden]

The problem is that I can't change anything in the message sender application (It's not my application), I can only manipulate the Qt application (my aplication, receiver of messages).
So I need something like QProcess::flush()...

[stampede]

You may try to pass QIODevice::Unbuffered flag when starting the process. I don't know if it works, never tried that.

[CroOm]

instead of showing the messages in the console screen pass them to a file or data array and print them to the console afterwards, u can access the file or data array anytime.

on the other hand , if your data is stored but not shown try to insert:
QApplication::processEvents() ;
based on how often errors are shown

[harden]

You may try to pass QIODevice::Unbuffered flag when starting the process. I don't know if it works, never tried that.

Doesn't work in this case.

Anyway, thanks for all the replies!