[Qgis-developer] qgis-server and troubles using jpeg as output format

[Larry Shaffer]

Hi Andrea,

It sounds to me like your Qt, when loaded by qgis_mapserv.fcgi, is not
correctly finding the 'plugins' directory, specifically its 'imageformats'
subdirectory. If that machine also runs QGIS Desktop, you can verify your
Qt install has the image plugins by launching QGIS and checking the
Providers section in the About QGIS dialog.

Since Qt has native, built-in support for PNG, it should always be able to
render a WMS request to PNG. If Qt can not load the Qt JPEG image format
plugin, then JPEG will not be rendered.

Just guessing, but you may try setting the env variable QT_PLUGIN_PATH in
the FCGI environment to help Qt find the plugins directory [0]. If the
imageformats subdirectory is missing some plugins, then there is something
funky/missing with your Qt install.

[0] http://qt-project.org/doc/qt-4.8/deployment-plugins.html

Regards,

Larry


On Tue, Jun 24, 2014 at 7:26 AM, Andrea Peri <aperi2007 at gmail.com> wrote:

> Hi,
> I do some tests.
> Using a shell environment to see any error returned.
>
> I see using the
> "FORMAT=image/png"
>  the image is correctly returned.
> Instead using the
> "FORMAT=image/jpeg"
> the image is not returned.
> But no crash at all.
> Simply the qgis-server request will end returning nothing.
>
> Also using a debug session no error reported.
> Only apparently return nothing.
>
>
> A.
>
>
> 2014-06-24 14:31 GMT+02:00 Andrea Peri <aperi2007 at gmail.com>:
> > Hi,
> > I'm having some trouble with qgis-server and the output in jpeg format.
> >
> > The request getmap using the jpeg format as not response at all.
> >
> > I try on two distinct debian machine but the result is the same.
> >
> > So I guess the most probable theory is the lack of a library or a
> > library too early on Debian stable distro'.
> >
> > So I like to know what is the used jpeg library and if there is a
> > minimal version for the jpeg library used.
> >
> > Thx
> > --
> > -----------------
> > Andrea Peri
> > . . . . . . . . .
> > qwerty àèìòù
> > -----------------
>
>
>
> --
> -----------------
> Andrea Peri
> . . . . . . . . .
> qwerty àèìòù
> -----------------
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