5.2 加载矢量图层(delimitedtext,spatialite,wfs,memory)本章讲述使用qgis c++ Api加载各种类型的矢量地图数据显示。Accesses data in a delimited text file, for example CSV files generated by spreadsheets. The contents of the file are split into columns based on specified delimiter characters. Each record may be represented spatially ei