It works for me!
QString uri =
"crs=EPSG:4326&featureCount=10&format=image/gif&layers=osm_auto:all&styles=&url=
http://129.206.228.72/cached/osm";;
QgsRasterLayer *rlayer = new QgsRasterLayer(uri, "layer_name", "wms",
false);
qDebug() << "layer is valid:" << rlayer->isValid();
connect( rlayer, SIGNAL(repaintRequested()), mapCanvas, SLOT(refresh())
);
QgsMapLayerRegistry::instance()->addMapLayer(rlayer);
QList <QgsMapCanvasLayer> myLayerSet;
myLayerSet.append(QgsMapCanvasLayer(rlayer, true));
//
mapCanvas->setExtent(rlayer->extent());
mapCanvas->enableAntiAliasing(true);
mapCanvas->freeze(false);
mapCanvas->setLayerSet(myLayerSet);
mapCanvas->setVisible(true);
mapCanvas->refresh();
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