Fix crash in standalone apps when no QgsApplication available

nyalldawson · nyalldawson · commit 9d0b0f27f2e3 · 2017-12-05T11:40:54.000+10:00
diff --git a/src/providers/wms/qgswmsprovider.cpp b/src/providers/wms/qgswmsprovider.cpp
@@ -614,7 +614,7 @@ static void _drawDebugRect( QPainter &p, const QRectF &rect, const QColor &color
 
 QImage *QgsWmsProvider::draw( QgsRectangle const &viewExtent, int pixelWidth, int pixelHeight, QgsRasterBlockFeedback *feedback )
 {
-  if ( QgsApplication::instance()->thread() != QThread::currentThread() )
+  if ( qApp && qApp->thread() != QThread::currentThread() )
   {
     QgsDebugMsg( "Trying to draw a WMS image on the main thread. Stop it!" );
   }

Original file line number	Diff line number	Diff line change
`@@ -614,7 +614,7 @@ static void _drawDebugRect( QPainter &p, const QRectF &rect, const QColor &color`
`614`	`614`
`615`	`615`	`QImage QgsWmsProvider::draw( QgsRectangle const &viewExtent, int pixelWidth, int pixelHeight, QgsRasterBlockFeedback feedback )`
`616`	`616`	`{`
`617`		`- if ( QgsApplication::instance()->thread() != QThread::currentThread() )`
	`617`	`+ if ( qApp && qApp->thread() != QThread::currentThread() )`
`618`	`618`	`{`
`619`	`619`	`QgsDebugMsg( "Trying to draw a WMS image on the main thread. Stop it!" );`
`620`	`620`	`}`