VectoreLayer Still Empty even if attribute has been set with value

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I am working with the qgis api c++ 2.8.2, my application is written in QT 4.5.3 / C++I had to create a vectorlayer in memory with attributes and features and export it to a shp file to import it in QGIS applicaiton

Sothe creation of the vectorLayer Works, it is based on the qgis python programmig cookbook page 56then I decide to add attributes and set featureHere is the code for the attributes :

QgsVectorDataProvider * lDataProvider = lVectorLayer->dataProvider();QDateTime MyTime;lVectorLayer->startEditing();// add attributeQList lMyAttribField;lMyAttribField
 
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