remove the error message for not finding a pdf viewer (apparently empty string is returned by FindExecutable if the executable is a Windows Store app). If there is really no pdf viewer, let the Windows itself decide what to do (produce error or not and which one).
The general problem is that Acrobat opens PDF files with write access so that PDF files cannot be modified externally by LyX/LaTeX.
The old pdfview used the programs pdfopen and pdfclose to open and close PDF files in Acrobat and it additionally closed and opened the PDF whenever it was changed (to simulate LyX's update button).
Since Acrobat DC (aka Acrobat 15) it is no longer possible to close PDF files in Acrobat. Due to changes in the Acrobat API also the pdfopen program can no longer be used.
Besides this the approach of updating the PDF whenever it changed was always a hack that often killed Acrobat. The reason is that one cannot immediately update the PDF view if the PDF is changed because depending on the size LaTeX needs up to several seconds to generate the PDF. If the PDF is opened while TeX is still creating is one get error messages from Acrobat Acrobat must be restarted - very annoying. During the years I experimented with a wait time to minimize these problems but of course it can never be solved.
The new pdfview version uses a completely different approach:
- it checks if the PDF is opened by Acrobat by reading the window name. If it is found this program windows will be closed. So Acrobat is not ended and other opened PDF files stay opened.
- to update the PDF view from within LyX one has to press the view button, not the update button. Only this way we know that TeX is ready and the PDF can be opened by Acrobat with write permissions.
- to be able to support Adobe Reader/Acrobat XI I had to use new binaries for opening/closing PDFs. That way I found the solution for a long standing and super annoying PDF viewing bug (not 100% perfect but works for more than 95% of the cases, while formerly the view failed for all cases where LaTeX run more than once when updating a PDF view)
- prepare for the upcoming release
- use Joost's pdfview program
- don't always delete the file extension when uninstalling
pdfview: add the needed DLLs
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@24471 a592a061-630c-0410-9148-cb99ea01b6c8
* New Console plug-in with support for restricted users
* Warning message if no PDF viewer is installed
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@15773 a592a061-630c-0410-9148-cb99ea01b6c8
