Hi,
I would like to use a processing algorithm in a plugin,
and run it as a QgsTask to avoid user interface "freeze".
I have tested with QGIS 3 (3.0.2) using the "native.buffer"
algorithm and a line vector layer:
context = QgsProcessingContext()
alg=QgsApplication.processingRegistry().algorithmById('native:buffer')
params={
'INPUT': inputlayer,
'DISTANCE': 100.0,
'OUTPUT':'/home/test.shp'
}
task = QgsProcessingAlgRunnerTask(alg,params,context)
QgsApplication.taskManager().addTask(task)
The algorithm runs fine (the progressbar in the status
area at the bottom of the QGIS interface is counting up
to 100% and the buffer data set is generated and OK),
but QGIS crashes immediately after the algorithm has
completed:
QGIS died on signal 11Could not attach to process. If your uid
matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user. For more details, see
/etc/sysctl.d/10-ptrace.conf
ptrace: Operation not permitted.
No thread selected
No stack.
gdb returned 0
Aborted (core dumped)
It would be great if someone could explain the proper way
of using QgsProcessingAlgRunnerTask, and perhaps provide
an example of how to use it in a plugin. I have tried to
search the web, but have not found much.
How should the "context" be set?
How should the task and the results be handled?
...
Håvard
--
Håvard Tveite
Faculty of Sciences and Technology, NMBU
Drøbakveien 31, POBox 5003, N-1432 Ås, NORWAY
Phone: +47 67231548 Web: http://www.nmbu.no
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