Re: qt terminal for windows : qDebug() problems

[Ethan A M. <sf...@us...>]

On Tuesday, 18 August, 2015 19:09:20 Tatsuro MATSUOKA wrote:
> Hello
> 
> This topic originally from the bug tracker.
> https://sourceforge.net/p/gnuplot/bugs/1554/
> 
> 
> Two topic
> 1) message related to qt terminal in gnuplot main program.
> 2) message in gnuplot_qt

I think you are correct.

1) The messages from qt_term.cpp can be written using fprintf(stderr, ...).
This would be consistent with error messages throughout the main program.
I will make this change.

2) Messages from the separate process gnuplot_qt should not try
to write directly to stderr, since this may not go anywhere useful.
qDebug() is supposed to handle this, but I can't help with how to
configure on Windows.

	Ethan

> 
> 1)*********************************************
> For qt terminal, some messages are represented by qDebug() in qt libraries.
> 
> However, using qDebug(), any message cannot be represented in wgnuplot.
> In gnuplot main program for windows (gnuplot.exe, wgnuplot.exe and wgnuplot_pipes.exe),
> fprintf is redefined and can be used to represent in stderr.
> (Of course, printf )
> 
> In main program qt related routine is mainly described in qt_term.cpp.
> In qt_term.cpp, qDebug() function is used in 7 times.
> 
> fprintf(stderr,"") ... is also used in qt_term.cpp.
> 
> For exapmle
> 
> 973: fprintf(stderr, "Qt terminal communication error: select() error %i %s\n", errno, strerror(errno));
> 
> I cannot find the reason why both qDebug() and fprintf(stderr,"") are used.
> 
> Can qDebug() replaced by fprintf(stderr,"") in qt_term.cpp?
> 
> ****************************************************** end of 1)
> 
> 
> 2) *********************************************************************
> BTW, for gnuplot_qt.exe situation is different.
> qDebug seems not to represent anything on gnuplot.exe, wgnuplot.exe nor wgnuplot_pipes.exe.
> 
> gnuplot_qt.exe works in another process so that it is difficult represent qDebug message to 
> wgnuplot command windows.  
> 
> Special treatment might be required to represent message from gnuplot_qt on windows.
> 
> Does anyone have good idea?
> ********************************************************** end of 2)
> 
> Tatsuro 
> 
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