how to display points with symbols V2 svg categorized? [closed]

Question

below is the code that i currently have on my application that i can't have working! Each time i select a point in the mapcanvas do not display my symbol.

can anyone give me an help or point me the direction to have the code working?

thanks

i found the solution my self and i shared it here, to help others.

//create Vector layer in memory for adding iamge markers
QgsVectorLayer *symbolsLayer = new QgsVectorLayer("Point", "temporairy_points", "memory");

QgsVectorDataProvider *provider = symbolsLayer->dataProvider();

//create new feature
QgsFeature feature = QgsFeature();

QgsPoint point = ui.qgsMapCanvas->getCoordinateTransform()->toMapCoordinates(e->pos().x(), e->pos().y());
QgsGeometry *geometry = geometry->fromPoint(point);         
feature.setGeometry(geometry);

QgsSvgMarkerSymbolLayerV2 svgMarkersymbolLayerV2 = new QgsSvgMarkerSymbolLayerV2(QCoreApplication::applicationDirPath () + "/data/symbols/test.svg");

QgsSymbolLayerV2List symbolLayerV2List;
symbolLayerV2List.clear();
symbolLayerV2List.append(svgMarkersymbolLayerV2);

QgsMarkerSymbolV2 *markerSymbolV2 = new QgsMarkerSymbolV2(symbolLayerV2List);

QgsRendererCategoryV2 *rendererCategoryV2 = new QgsRendererCategoryV2(0, markerSymbolV2, "0");

QgsCategoryList categoryList;
categoryList.clear();
categoryList.append(*rendererCategoryV2);

QgsCategorizedSymbolRendererV2 *categorizedSymbolRendererV2 = new QgsCategorizedSymbolRendererV2("A", categoryList);

symbolsLayer->startEditing();
symbolsLayer->setRendererV2(categorizedSymbolRendererV2);               
symbolsLayer->addAttribute(QgsField("A", QVariant::String, "String", 4, 0, ""));

QList<QgsField> lstFields;
lstFields.insert(0, QgsField("A", QVariant::String, "String", 4, 0, ""));
provider->addAttributes(lstFields);

categorizedSymbolRendererV2->startRender(QgsRenderContext(), symbolsLayer);

feature.clearAttributeMap();
QgsAttributeMap attributeMap;
attributeMap.insert(0, "0");
feature.setAttributeMap(attributeMap);

categorizedSymbolRendererV2->renderFeature(feature, QgsRenderContext(), symbolsLayer->id().toInt(), false, false);

QgsFeatureList qgsfeaturesList = QgsFeatureList();
qgsfeaturesList.append(feature);
provider->addFeatures(qgsfeaturesList);

symbolsLayer->updateExtents();

// Add the Vector Layer to the Layer Registry
QgsMapLayerRegistry::instance()->addMapLayer(symbolsLayer, false);

myLayerSet.prepend(QgsMapCanvasLayer(symbolsLayer, true));

// Set the Map Canvas Layer Set
ui.qgsMapCanvas->setLayerSet(myLayerSet);