#2424: PyGRASS does not work when GRASS is invoked from outside -------------------------+------------------------------------------------- Reporter: wenzeslaus | Owner: grass-dev@… Type: defect | Status: new Priority: normal | Milestone: 7.2.3 Component: Python | Version: svn-trunk ctypes | Keywords: installation, pygrass, temporal, Resolution: | scripts CPU: | Platform: MSWindows 8 Unspecified | -------------------------+-------------------------------------------------
Comment (by wenzeslaus): These both help, but just to clarify, here we are concerned with only the part of the Python API which uses `ctypes` in the background, i.e. not `grass.script` which works just fine, but with `grass.temporal` and a significant part of `grass.pygrass`. Replying to [comment:12 neteler]: > * Python: GRASS GIS 7 with an external library: grass-session: This makes using `grass.script` much easier, but it is not possible to use anything which calls ''ctypes'' (`grass.lib`), i.e. `grass.temporal` and `grass.pygrass`, unless the dynamic libraries are loaded in some special way (just changing `LD_LIBRARY_PATH` was not enough so far). (From `grass.pygrass` I mean the part using `ctypes`, otherwise see the comment:3 to comment:6 here.) > * New easy-to-use CLI and API for GRASS GIS In past your would have to do this (see comment:6 for details): {{{ export LD_LIBRARY_PATH=$(grass70 --config path)/lib python script_with_ctypes.py }}} Since 7.2 (after #2579, i.e. r65252), you can (see again comment:6 for details): {{{ grass ~/grassdata/nc_spm/test/ --exec script_with_ctypes.py }}} In regard to this ticket, the proposed CLI would work similarly to current `--exec`. Same goes to the proposed Python API and the current APIs. Nevertheless, `--exec` and the proposed CLI interface reduce the need to load the libraries, for example, because the recommended way of using them is to write a GRASS module and then call it using `--exec` - this way the GRASS-specific part of the program is isolated and at the same time usable as a separate GRASS module. -- Ticket URL: <https://trac.osgeo.org/grass/ticket/2424#comment:13> GRASS GIS <https://grass.osgeo.org>
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