def runAlgorithm(algOrName,
parameters,
onFinish=None,
feedback=None,
context=None):
if isinstance(algOrName, QgsProcessingAlgorithm):
alg = algOrName
else:
alg = QgsApplication.processingRegistry().createAlgorithmById(
algOrName)
if feedback is None:
feedback = QgsProcessingFeedback()
if alg is None:
msg = Processing.tr('Error: Algorithm {0} not found\n').format(
algOrName)
feedback.reportError(msg)
raise QgsProcessingException(msg)
if context is None:
context = dataobjects.createContext(feedback)
if context.feedback() is None:
context.setFeedback(feedback)
ok, msg = alg.checkParameterValues(parameters, context)
if not ok:
msg = Processing.tr('Unable to execute algorithm\n{0}').format(msg)
feedback.reportError(msg)
raise QgsProcessingException(msg)
if not alg.validateInputCrs(parameters, context):
feedback.pushInfo(
Processing.
tr('Warning: Not all input layers use the same CRS.\nThis can cause unexpected results.'
))
ret, results = execute(alg, parameters, context, feedback)
if ret:
feedback.pushInfo(Processing.tr('Results: {}').format(results))
if onFinish is not None:
onFinish(alg, context, feedback)
else:
# auto convert layer references in results to map layers
for out in alg.outputDefinitions():
if out.name() not in results:
continue
if isinstance(out, (QgsProcessingOutputVectorLayer,
QgsProcessingOutputRasterLayer,
QgsProcessingOutputMapLayer)):
result = results[out.name()]
if not isinstance(result, QgsMapLayer):
layer = context.takeResultLayer(
result
) # transfer layer ownership out of context
if layer:
results[out.name(
)] = layer # replace layer string ref with actual layer (+ownership)
elif isinstance(out, QgsProcessingOutputMultipleLayers):
result = results[out.name()]
if result:
layers_result = []
for l in result:
if not isinstance(result, QgsMapLayer):
layer = context.takeResultLayer(
l
) # transfer layer ownership out of context
if layer:
layers_result.append(layer)
else:
layers_result.append(l)
else:
layers_result.append(l)
results[out.name(
)] = layers_result # replace layers strings ref with actual layers (+ownership)
else:
msg = Processing.tr("There were errors executing the algorithm.")
feedback.reportError(msg)
raise QgsProcessingException(msg)
if isinstance(feedback, MessageBarProgress):
feedback.close()
return results
def runAlgorithm(algOrName, parameters, onFinish=None, feedback=None, context=None):
if isinstance(algOrName, QgsProcessingAlgorithm):
alg = algOrName
else:
alg = QgsApplication.processingRegistry().createAlgorithmById(algOrName)
if feedback is None:
feedback = QgsProcessingFeedback()
if alg is None:
msg = Processing.tr('Error: Algorithm {0} not found\n').format(algOrName)
feedback.reportError(msg)
raise QgsProcessingException(msg)
if context is None:
context = dataobjects.createContext(feedback)
if context.feedback() is None:
context.setFeedback(feedback)
ok, msg = alg.checkParameterValues(parameters, context)
if not ok:
msg = Processing.tr('Unable to execute algorithm\n{0}').format(msg)
feedback.reportError(msg)
raise QgsProcessingException(msg)
if not alg.validateInputCrs(parameters, context):
feedback.pushInfo(
Processing.tr('Warning: Not all input layers use the same CRS.\nThis can cause unexpected results.'))
ret, results = execute(alg, parameters, context, feedback)
if ret:
feedback.pushInfo(
Processing.tr('Results: {}').format(results))
if onFinish is not None:
onFinish(alg, context, feedback)
else:
# auto convert layer references in results to map layers
for out in alg.outputDefinitions():
if out.name() not in results:
continue
if isinstance(out, (QgsProcessingOutputVectorLayer, QgsProcessingOutputRasterLayer, QgsProcessingOutputMapLayer)):
result = results[out.name()]
if not isinstance(result, QgsMapLayer):
layer = context.takeResultLayer(result) # transfer layer ownership out of context
if layer:
results[out.name()] = layer # replace layer string ref with actual layer (+ownership)
elif isinstance(out, QgsProcessingOutputMultipleLayers):
result = results[out.name()]
if result:
layers_result = []
for l in result:
if not isinstance(result, QgsMapLayer):
layer = context.takeResultLayer(l) # transfer layer ownership out of context
if layer:
layers_result.append(layer)
else:
layers_result.append(l)
else:
layers_result.append(l)
results[out.name()] = layers_result # replace layers strings ref with actual layers (+ownership)
else:
msg = Processing.tr("There were errors executing the algorithm.")
feedback.reportError(msg)
raise QgsProcessingException(msg)
if isinstance(feedback, MessageBarProgress):
feedback.close()
return results
