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Console debuging [message #1715491]

Tue, 24 November 2015 04:09

Pavel Petrov

Messages: 2
Registered: November 2015

Junior Member

Hi there!

I am totaly newbie in C/C++ code/debug .
So my first question to all of know-how-ers:

how may i get console messages in debuging run-time?

Now i get a couple of test printf() messages only while Windows shutdown the process. Is this is a win-shell feature or gdb feature? Or may be i do something wrong?

Please, help. Very thx

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Re: Console debuging [message #1715650 is a reply to message #1715491]

Wed, 25 November 2015 02:52

David Vavra

Messages: 1426
Registered: October 2012

Senior Member

Your question is not clear but you seem to be asking how to see the output as it occurs.
This generally requires you to set either line buffer mode or unbuffered mode.

My preference is line buffered mode which buffers the output until a newline is transmitted.
To do this:

#include <stdio.h>
setvbuf(stdout, NULL, _IOLBF, 256);

Or fully unbuffered: where each character is output when sent:

#include <stdio.h>
setvbuf(stdout, NULL, _IONBF, 0);

Or you could flush the buffer occasionally using fflush(stdout);

The above are for FILE* objects like stdout. There is a similar function for c++ i/o streams .
see: std::streambuf::pubsetbuf
http://www.cplusplus.com/reference/streambuf/streambuf/pubsetbuf/

[Updated on: Wed, 25 November 2015 03:03]

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