Beispiel #1
0
    def testLayerRemovalBeforeRun(self):
        """test behavior when layer is removed before task begins"""
        path = os.path.join(unitTestDataPath(), 'raster',
                            'with_color_table.tif')
        raster_layer = QgsRasterLayer(path, "test")
        self.assertTrue(raster_layer.isValid())

        pipe = QgsRasterPipe()
        self.assertTrue(pipe.set(raster_layer.dataProvider().clone()))

        tmp = create_temp_filename('remove_layer.tif')
        writer = QgsRasterFileWriter(tmp)

        task = QgsRasterFileWriterTask(writer, pipe, 100, 100,
                                       raster_layer.extent(),
                                       raster_layer.crs())

        task.writeComplete.connect(self.onSuccess)
        task.errorOccurred.connect(self.onFail)

        # remove layer
        raster_layer = None

        QgsApplication.taskManager().addTask(task)
        while not self.success and not self.fail:
            QCoreApplication.processEvents()

        # in this case will still get a positive result - since the pipe is cloned before the task
        # begins the task is no longer dependent on the original layer
        self.assertTrue(self.success)
        self.assertFalse(self.fail)
        self.assertTrue(os.path.exists(tmp))
Beispiel #2
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    def testSuccess(self):
        """test successfully writing a layer"""
        path = os.path.join(unitTestDataPath(), 'raster',
                            'with_color_table.tif')
        raster_layer = QgsRasterLayer(path, "test")
        self.assertTrue(raster_layer.isValid())

        pipe = QgsRasterPipe()
        self.assertTrue(pipe.set(raster_layer.dataProvider().clone()))

        tmp = create_temp_filename('success.tif')
        writer = QgsRasterFileWriter(tmp)

        task = QgsRasterFileWriterTask(writer, pipe, 100, 100,
                                       raster_layer.extent(),
                                       raster_layer.crs())

        task.writeComplete.connect(self.onSuccess)
        task.errorOccurred.connect(self.onFail)

        QgsApplication.taskManager().addTask(task)
        while not self.success and not self.fail:
            QCoreApplication.processEvents()

        self.assertTrue(self.success)
        self.assertFalse(self.fail)
        self.assertTrue(os.path.exists(tmp))