QString wkbStr = wkb->toWkt(); qDebug() << "WKB String: " << wkbStr;return app.exec();}```2. Python开发在Python中,我们可以使用pyqgis库来实现我们的需求。以下是一个简单的示例代码:```pythonfrom qgis.core import QgsWkbPtr, QgsVectorLayer, QgsFeature, QgsGeometry, QgsPointXY, QgsCoo...
QgsField* filed =newQgsField(QStringLiteral("频率"), QVariant::String);alarmLayer->addAttribute(*filed));//也可通过alarmLayer->dataProvier()->addAttributes(QgsFields); alarmLayer->updateFields();alarmLayer->commitChanges();//根据id添加属性alarmLayer->startEditing(); alarmLayer->changeAttribute...
How to Test FCM Data Push Notifications Delivery? String in list into list, python How to solve this error "Could not load file or assembly 'DevExpress.Web.ASPxPivotGrid.v15.2"? Speed up Mootools accordion Firefox add-on SDK: Run content script in all open pages and any new ones ...
QMap<int, int> idmap = generateIdIndex(); //由原shp图层得到QMap<ID, featureId> int fieldIndex = -1; //每个待插入字段的索引号 int IdIndex = -1; // ID字段的索引号 for (int j = 0; j < readlist.count(); ++j) { QString filed; QgsChangedAttributesMap changeMap; QgsAttributeMap ...
QString basename= temp.at(temp.size() -1); QgsVectorLayer* vecLayer =newQgsVectorLayer(fileName, basename,"ogr");if(!vecLayer->isValid()) { QMessageBox::critical(this,"error", QString("layer is invalid: \n") +fileName);return; ...
QString name, value; QMap<QString,QString>::iterator it; int i = 0; for (i = 0; i < datas.count(); i ++) { QMap<QString,QString> data = datas.at(i); int j = 0; for (it = data.begin(), j = 0; it != data.end(), j < data.count(); ++it, ++j) ...
上面的对象基本与栅格图层一致,除了 vdp : QgsVectorDataProvider = vectorLayer.dataProvider() ,编码可以由vdp.encoding()获得,数据源可以由vdp.description()获得,几何图形类型可以由 QgsWkbTypes .geometryDisplayString(vectorLayer.geometryType()),获得。
QObject::connect(&lineEdit, &QLineEdit::textChanged, [&](const QString& text) { // 将输入框的值转换为0到100的整数值 int value = text.toDouble() * 100; // 更新滑动条的值 slider.setValue(value); // 更新图层的透明度 updateOpacity(mapLayer, text.toDouble()); ...
intmain(intargc,char*argv[]) { QgsApplicationa(argc, argv,true); QgsApplication::setPluginPath(QDir::currentPath()+"/Plugins"); QgsApplication::initQgis(); MainWindow w; w.show(); returna.exec(); } 其中,QgsApplication::setPluginPath(QDir::currentPath()+"/Plugins");表示指定QGIS插件路径...
();intb=0;QtGuiApplication1w;w.setWindowTitle("hello");b=b+5;QgsMapCanvas*map=newQgsMapCanvas();w.setCentralWidget(map);QStringpath="d:\\coding\\QT-Projects\\shps\\ne_50m_land.shp";QgsVectorLayer*layer=newQgsVectorLayer(path,"world","ogr");if(!layer->isValid()){QMessageBox:...