Check whether layer index is valid in getZpos().

git-svn-id: http://svn.osgeo.org/qgis/trunk@6744 c8812cc2-4d05-0410-92ff-de0c093fc19c
qgis · Mar 2, 2007 · 7ffde33 · 7ffde33
1 parent 1f88873
commit 7ffde33
Showing 1 changed file with 5 additions and 2 deletions.
diff --git a/src/gui/qgsmapcanvas.cpp b/src/gui/qgsmapcanvas.cpp
@@ -175,8 +175,11 @@ QgsMapRender* QgsMapCanvas::mapRender()
 
 QgsMapLayer* QgsMapCanvas::getZpos(int index)
 {
-  QString layer = mMapRender->layerSet()[index];
-  return QgsMapLayerRegistry::instance()->mapLayer(layer);
+  std::deque<QString>& layers = mMapRender->layerSet();
+  if (index >= 0 && index < (int) layers.size())
+    return QgsMapLayerRegistry::instance()->mapLayer(layers[index]);
+  else
+    return NULL;
 }