topic Re: state names as lable on shape file from local repository in Qt Maps SDK Questions

state names as lable on shape file from local repository

anshushrivastava — Mon, 27 Jan 2020 13:08:02 GMT

Hello,

I am new in arcgis .I am trying to load shapefile with state names .I want to load state names from local file not online data .I have .shx,.shp.dbf and .geodatabase files in my system .Please give some solution

my code

void CTacticalViewClass::LoadingOfServiceFeatureFile()
{
        ServiceFeatureTable* servicefeatureTable = new ServiceFeatureTable(QUrl("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/layers/2"), this);
        FeatureLayer* featureLayer = new FeatureLayer(servicefeatureTable, this);
        connect(featureLayer, &FeatureLayer::doneLoading, [this, featureLayer](Error e)
        {
          if (!e.isEmpty())
            return;

m_mapShapeView->setViewpoint(Viewpoint(featureLayer->fullExtent().center(), 56759600));
});

m_Shapemap->operationalLayers()->append(featureLayer);

        // Apply labels to the feature layer
        const QString labelJson = createLabelJson();
        LabelDefinition* labelDef = LabelDefinition::fromJson(labelJson, this);
        featureLayer->labelDefinitions()->append(labelDef);
        featureLayer->setLabelsEnabled(true);

m_mapShapeView->setMap(m_Shapemap);
}

ServiceFeatureTable will contain which kind of local file.

Aditya Peri‌Alexandra Gajewski Allen Thompson Jon Fiskness Gary Chrysler Huailin wang@

Re: state names as lable on shape file from local repository

LucasDanzinger — Tue, 28 Jan 2020 16:16:03 GMT

Have you taken a look at the labeling sample? - arcgis-runtime-samples-qt/ShowLabelsOnLayers.cpp at master · Esri/arcgis-runtime-samples-qt · GitHub

Re: state names as lable on shape file from local repository

anshushrivastava — Thu, 30 Jan 2020 08:11:18 GMT

Thanku for reply.

I Have taken a look at the labeling sample -arcgis-runtime-samples-qt/ShowLabelsOnLayers.cpp at master · Esri/arcgis-runtime-samples-qt · GitHub .

After code change i am not able to get state names and getting some error like this

Exception thrown in Feature_source_layer::Feature_source_layer_label_data_source::get_next_feature() - "SQL error or missing database" - "no such column: rte_num1"

which file i have to prefer for column name .shp, .shx or .dbf file

please check this code

void CTacticalViewClass::LoadingOfServiceFeatureFile()
{

ShapefileFeatureTable* servicefeatureTable = new ShapefileFeatureTable("/home/GIS/Desktop/ChartEngineMainFolder/ChartEngine/ArcGIS/Runtime/Data/shp/India/india_st.shp", this);
servicefeatureTable->load();

FeatureLayer* featureLayer = new FeatureLayer(servicefeatureTable, this);

    connect(featureLayer, &FeatureLayer::doneLoading, [this, featureLayer](Error e)
    {
        if (!e.isEmpty())
            return;

m_mapShapeView->setViewpoint(Viewpoint(featureLayer->fullExtent().center(), 56759600));
});

m_Shapemap->operationalLayers()->append(featureLayer);

    // Apply labels to the feature layer
    const QString labelJson = createLabelJson();
    LabelDefinition* labelDef = LabelDefinition::fromJson(labelJson, this);
    featureLayer->labelDefinitions()->append(labelDef);
    featureLayer->setLabelsEnabled(true);

}

QString CTacticalViewClass::createLabelJson() const
{
return QString(QStringLiteral("{\"labelExpressionInfo\":{\"expression\":\"'I - ' + $feature.rte_num1\"},\"labelPlacement\":\"esriServerLinePlacementAboveAlong\",\"where\":\"rte_num1 <> ' '\",\"symbol\": {\"angle\":0,\"backgroundColor\":[0,0,0,0],\"borderLineColor\":[0,0,0,0],\"borderLineSize\":0,\"color\":[0,0,255,255],\"font\": {\"decoration\":\"none\",\"size\":15,\"style\":\"normal\",\"weight\":\"normal\"},\"haloColor\":[255,255,0,255],\"haloSize\":1.5,\"horizontalAlignment\":\"center\",\"kerning\":false,\"type\":\"esriTS\",\"verticalAlignment\":\"middle\",\"xoffset\":0,\"yoffset\":0}}"));
}

Re: state names as lable on shape file from local repository

LucasDanzinger — Fri, 31 Jan 2020 15:45:43 GMT

Do you have a column/field named "rte_num1"? The label json specifies that the label should be based on a field named "rte_num1" and use a where clause where that field isn't an empty string. The sample was setup to use this field but you should update it to match your data's schema.

Re: state names as lable on shape file from local repository

anshushrivastava — Sun, 02 Feb 2020 15:14:52 GMT

hi,

I understand what you want to tell.But My confusion is related to database file which will contain tables.I have India.shp , India.shx and India.dbf file.To Know column names which file i will use (India.shp, India.shx or India.dbf) or anyother file will be required .If possible can you give some example of your used shape file and database file.It will be more helpfull.

Thanku