Re: [Gegl-developer] Problem running GEGL hello-world example

[Michael Henning <drawoc darkrefraction com>]

The example program uses a gegl:display op. The issue you're running
into is that you didn't compile gegl against any libraries that can
provide the display op.

You can fix this by either compiling gegl with SDL support (there are
SDL binaries for windows online, so that shouldn't be too difficult to
set up), or by modifying the example to save a png file instead of
trying to display a window (I'd recommend you try this anyway, if
you're trying to learn gegl's api).

Feel free to post back with any more questions you have.

On Sat, Mar 30, 2013 at 5:46 PM, ChristophK <christoph kobenetz de> wrote:
> GEGL-0.2.0 on Window 7 64bit / mingw32 / msys
>
>
> Hello,
>
> after compiling GEGL I'm trying to run the hello-world example and get
> the following errors:
>
> ----
> christoph HTPC /k/daten/programmierung/libraries/gegl-0.2.0/examples
> $ export GEGL_PATH=/k/daten/programmierung/libraries/gegl-0.2.0/
>
> christoph HTPC /k/daten/programmierung/libraries/gegl-0.2.0/examples
> $ ./hello-world.exe
> GEGL-geglmodule.c-Message: Module
> 'k:/daten/programmierung/libraries/gegl-0.2.0\ gegl\.libs
> \libgegl-0.2-0.dll' load error: Missing gegl_module_query() symbol
>
> (hello-world.exe:2980): GEGL-display.c-WARNING **: No display handler
> operation found for gegl:display
>
> (hello-world.exe:2980): GEGL-gegl-operation-context.c-WARNING **:
> gegl_operation _context_take_object: No paramspec found for pad
> 'output' on "gegl:display"
>
> ... same message repeated many times ...
>
> (hello-world.exe:1132): GEGL-gegl-operation-context.c-WARNING **:
> gegl_operation _context_take_object: No paramspec found for pad
> 'output' on "gegl:display"
>
> EEEEeEeek! 2 GeglBuffers leaked
> christoph HTPC /k/daten/programmierung/libraries/gegl-0.2.0/examples
> $
> ----
>
> That's what happened during configure:
>
> ----
> Building GEGL with prefix=/usr/local
>
> Optional features:
>   GEGL docs:       yes
>   Build workshop:  no
>   Build website:   no  (asciidoc not found)
>   SIMD:            sse:yes mmx:yes
>   Vala support:    no  (vapigen executable not found)
>
> Optional dependencies:
>   asciidoc:        no  (asciidoc not found)
>   enscript:        no  (enscript not found)
>   Ruby:            no
>   Lua:             no  (usable lua not found)
>   Cairo:           yes
>   Pango:           yes
>   pangocairo:      yes
>   GDKPixbuf:       yes
>   JPEG:            yes
>   PNG:             yes
>   OpenEXR:         no  (OpenEXR library not found)
>   rsvg:            no  (usable librsvg not found)
>   SDL:             no  (SDL library not found)
>   openraw:         no  (openraw library not found)
>   Jasper:          no  (jasper library not found)
>   graphviz:        no  (graphviz not found)
>   avformat:        no  (libavformat not found)
>   V4L:             no
>   spiro:           no  (usable SPIRO library not found)
>   EXIV:            no  (exiv2 library not found)
>   umfpack:         no  (usable umfpack library not found)
>
>
> christoph HTPC /k/daten/programmierung/libraries/gegl-0.2.0
> $
> ----
>
> What do I have to do to make the hello-world example work?
>
> Chris
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