用GDAL/OGR去读shapefile

一、读shapefile

1、首先，用Arcgis创建所要读的shp文件。打开ArcCatalog,右键NEW->Shapefile，名称Name:point ，要素类型（Feature Type）:Point。点击Edit，选择投影类型。

2、打开ArcMap. 单击工具栏里的Add data按钮，打开刚才创建的point.shp文件。

3、添加5个点要素，并添加字段（添加字段要在非编辑模式下，修改字段的值要在编辑模式下，记得退出编辑时要保存），如图所示：

编辑如下C++/GDAL代码：

#include "ogrsf_frmts.h"int main(){OGRRegisterAll();OGRDataSource *poDS;poDS = OGRSFDriverRegistrar::Open( "G:\\LJF\\point.shp", FALSE );//shape文件存放的路径（point.shp即为自己创建的文件）if( poDS == NULL ){printf( "Open failed.\n%s" );exit( 1 );}OGRLayer  *poLayer;poLayer = poDS->GetLayerByName( "point" );OGRFeature *poFeature;poLayer->ResetReading();while( (poFeature = poLayer->GetNextFeature()) != NULL )//获得要素，本实例指的是五个点，所以会循环5次{OGRFeatureDefn *poFDefn = poLayer->GetLayerDefn();int iField;int i=poFDefn->GetFieldCount(); //获得字段的数目，本实例返回5，不包括前两个字段（FID,Shape），这两个字段在arcgis里也不能被修改;for( iField = 0; iField < poFDefn->GetFieldCount(); iField++ ){OGRFieldDefn *poFieldDefn = poFDefn->GetFieldDefn( iField );//根据字段值得类型，选择对应的输出if( poFieldDefn->GetType() == OFTInteger )printf( "%d,", poFeature->GetFieldAsInteger( iField ) );else if( poFieldDefn->GetType() == OFTReal )printf( "%.3f,", poFeature->GetFieldAsDouble(iField) );else if( poFieldDefn->GetType() == OFTString )printf( "%s,", poFeature->GetFieldAsString(iField) );elseprintf( "%s,", poFeature->GetFieldAsString(iField) );}OGRGeometry *poGeometry;poGeometry = poFeature->GetGeometryRef();if( poGeometry != NULL && wkbFlatten(poGeometry->getGeometryType()) == wkbPoint ){OGRPoint *poPoint = (OGRPoint *) poGeometry;printf( "%.3f,%3.f\n", poPoint->getX(), poPoint->getY() );}else{printf( "no point geometry\n" );}       OGRFeature::DestroyFeature( poFeature );}OGRDataSource::DestroyDataSource( poDS );system("pause");return 0;
}

运行结果如下图：