PIE-SDK For C++矢量数据的修改

第一步

获取需要修改的矢量数据

第二步

根据条件进行设置要素的值进行修改或删除

接口/类

方法/属性

说明

SysDataSource::DatasetFactory

OpenFeatureDataset(QString path)

创建要素数据集

SysDataSource::FeatureDatasetPtr

GetNextFeature()

获取下一个要素

UpdateFeature()

更新要素

DeleteFeature()

删除要素

UpdateFeature()

更新要素

SysDataSource::FeaturePtr

SetValue()

设置字段值

项目路径

百度云盘地址下/PIE示例程序/04数据操作/05矢量数据的修改

数据路径

自定义即可

视频路径

百度云盘地址下/PIE视频教程/04数据操作/05矢量数据的修改.avi

示例代码

void PIEMainWindow::On_ActionEditVectorData_Triggered(bool checked)

{

    QString filter = "Shapefiles (*.shp)";

    QString inputFile = QFileDialog::getOpenFileName(nullptr, "请选择要编辑的数据", "", filter);

    if (inputFile.isEmpty())

    {

        return;

    }

    SysDataSource::FeatureDatasetPtr fDataSetPtr = SysDataSource::DatasetFactory::Instance()->OpenFeatureDataset(inputFile);

    if (fDataSetPtr == nullptr) return;

    //删除要素

    fDataSetPtr->DeleteFeature(0);//删除FID为0的要素

    //修改要素

    SysDataSource::FeatureClassPtr pFeatureClass = new SysDataSource::FeatureClass(fDataSetPtr);

    SysDataSource::FeatureCursorPtr pCursor = pFeatureClass->Search(nullptr);

    int index = pFeatureClass->GetFields()->GetFieldIndex("Name");//根据实际数据情况进行适配即可

    //遍历要素，修改字段Name属性值为B

    SysDataSource::FeaturePtr pFeature = pCursor->NextFeature();

    while (pFeature!=nullptr)

    {

        pFeature->SetValue(index, "B");

        fDataSetPtr->UpdateFeature(pFeature);

        pFeature = pCursor->NextFeature();

    }

    bool flag= fDataSetPtr->Save();

    pCursor->Release();

    SysCarto::LayerPtr fLayer = SysCarto::LayerFactory::Instance()->CreateDefaultLayer(inputFile);

    m_pCurrentControl->GetMap()->AddLayer(fLayer);

    m_pCurrentControl->GetActiveView()->Refresh();

}