Throw exception when raster output could not be created

qgis · Jun 13, 2018 · b26957e · b26957e
1 parent 85d895d
commit b26957e
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diff --git a/python/plugins/processing/algs/qgis/CreateConstantRaster.py b/python/plugins/processing/algs/qgis/CreateConstantRaster.py
@@ -30,6 +30,8 @@
 import struct
 
 from qgis.core import (Qgis,
+                       QgsErrorMessage,
+                       QgsProcessingException,
                        QgsRasterBlock,
                        QgsRasterFileWriter,
                        QgsProcessingParameterExtent,
@@ -94,6 +96,12 @@ def processAlgorithm(self, parameters, context, feedback):
         writer.setOutputProviderKey('gdal')
         writer.setOutputFormat(outputFormat)
         provider = writer.createOneBandRaster(Qgis.Float32, cols, rows, extent, crs)
+        if provider is None:
+            raise QgsProcessingException(self.tr("Could not create raster output: {}").format(outputFile))
+        if not provider.isValid():
+            raise QgsProcessingException(self.tr("Could not create raster output {}: {}").arg(outputFile,
+                                                                                              provider.error().message(QgsErrorMessage.Text)))
+
         provider.setNoDataValue(1, -9999)
 
         data = [value] * cols

diff --git a/src/analysis/processing/qgsalgorithmreclassifybylayer.cpp b/src/analysis/processing/qgsalgorithmreclassifybylayer.cpp
@@ -128,6 +128,8 @@ QVariantMap QgsReclassifyAlgorithmBase::processAlgorithm( const QVariantMap &par
   std::unique_ptr<QgsRasterDataProvider > provider( writer->createOneBandRaster( Qgis::Float32, mNbCellsXProvider, mNbCellsYProvider, mExtent, mCrs ) );
   if ( !provider )
     throw QgsProcessingException( QObject::tr( "Could not create raster output: %1" ).arg( outputFile ) );
+  if ( !provider->isValid() )
+    throw QgsProcessingException( QObject::tr( "Could not create raster output %1: %2" ).arg( outputFile, provider->error().message( QgsErrorMessage::Text ) ) );
 
   provider->setNoDataValue( 1, mNoDataValue );