Am Freitag, 15. März 2019 11:47:09 CET schrieb Pierre Woestyn 
<pierre.woes...@onsemi.com>:
> Kornel wrote:
> > 
> > Am Freitag, 15. März 2019 08:59:58 CET schrieb Pierre Woestyn 
> > <pierre.woes...@onsemi.com>:
> > > Kornel wrote:
> > > > 
> > > > Am Donnerstag, 14. März 2019 17:14:28 CET schrieb Pierre Woestyn 
> > > > <pierre.woes...@onsemi.com>:
> > > > > Kornel wrote:
> > > > > 
> > ...
> > > > 
> > > > Please start lyx as you do normally. The hint was in this respect.
> > > > 
> > > > The parameter '-help' shows output on console, but does not start lyx. 
> > > > Since the console output is not working for you, you don't see anything.
> > > > 
> > > >         Kornel
> > > >
> > > 
> > > Hello Kornel,
> > > 
> > > Sorry, I misunderstood. After starting the GUI from the start menu, the 
> > > debug messages are:
> > > 
> > > 09:56:19.617: (dialog-toggle progress)frontends/qt4/GuiApplication.cpp 
> > > (1357): dispatch msg is
> > 
> > ...
> > 
> > So, now that you see the output, you can select the debug info you need.
> > See Wiew->Messages Pane->Settings
> > Select 'Debug messages->Selected' and select any debug line with double 
> > click Then the tab 'Output' shows the expected debug messages.
> > 
> > > 
> > > Regards, Pierre.
> > > 
> > 
> 
> Hello Kornel,
> 
> Sorry, I think I did not formulate my problem precisely enough. I was trying 
> to export documents (LyX > PDF) on the command line:
> 
>       C:\>"c:\Program Files (x86)\LyX 2.3\bin\LyX.exe" input.lyx --export pdf
> 
> This did not work, LyX exits immediately producing a PDF or printing anything 
> on the console. It also does not start the GUI. So I tried the help:
> 
>       C:\>"c:\Program Files (x86)\LyX 2.3\bin\LyX.exe" -export pdf

What you wanted is probably 
        ... -export pdf2
The pdf export uses the path
        latex - dvips - ps2pdf
while pdf2 uses directly
        pdflatex
to create a pdf file.

> This also printed nothing; this was the problem I reported because I thought 
> it made sense to report the simplest possible problem. However, my end goal 
> is to export LyX documents to PDF and TeX from the command line. Sorry about 
> the confusion.
> 
> Regards, Pierre.
> 

This _IS_ the way lyx. works. '-export' does not use the GUI. Unfortunately the 
latex log-files are created in a temp directory
which is deleted afterwards. So, to see this log file, you are forced to export 
from inside a lyx session
        File->Export->PDF (pdflatex)
and then use
        Document->Latex Log
to examine the latex output.

        Kornel

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