Class: QgsVectorFileWriterTask

QgsTask task which performs a QgsVectorFileWriter layer saving operation as a background task.

This can be used to save a vector layer out to a file without blocking the QGIS interface.

See also

QgsVectorLayerExporterTask

See also

QgsRasterFileWriterTask

Class Hierarchy

Base classes

QgsTask	Abstract base class for long running background tasks.
QObject

Signals

errorOccurred	Emitted when an error occurs which prevented the file being written (or if the task is canceled).
writeComplete	Emitted when writing the layer is successfully completed.

class qgis.core.QgsVectorFileWriterTask

Bases: QgsTask

__init__(layer: QgsVectorLayer | None, fileName: str | None, options: QgsVectorFileWriter.SaveVectorOptions, sinkFlags: QgsFeatureSink.SinkFlags | QgsFeatureSink.SinkFlag = QgsFeatureSink.SinkFlags())

Constructor for QgsVectorFileWriterTask. Takes a source layer, destination fileName and save options.

Since QGIS 3.40 the sinkFlags can be specified.

Parameters:

• layer (Optional[QgsVectorLayer])

• fileName (Optional[str])

• options (QgsVectorFileWriter.SaveVectorOptions)

• sinkFlags (Union[QgsFeatureSink.SinkFlags, QgsFeatureSink.SinkFlag] = QgsFeatureSink.SinkFlags())

signal errorOccurred(error: int, errorMessage: str)

Emitted when an error occurs which prevented the file being written (or if the task is canceled). The writing error and errorMessage will be reported.

Parameters:

• error (int)

• errorMessage (str)

signal writeComplete(newFilename: str)

Emitted when writing the layer is successfully completed. The newFilename parameter indicates the file path for the written file.

Note

this signal is deprecated in favor of completed().

Parameters:

newFilename (str)