[英]QT C++ application using QGIS API
我正在嘗試開發使用QGIS API的QT C ++應用程序,但是我無法管理Qt Creator來編譯代碼。 我已經在gis.stackexchange和其他來源閱讀了一些主題。 該信息大部分是過時的,我還沒有找到解決方案。 我需要的是有關以下各項的兼容性的總體指南,可幫助我找到合適的組合:
Qt在每種情況下都可以使用其自己的庫工作,但是,當我嘗試導入QGIS庫時,即使intellisense可以正常工作,因為它將QgsApplication識別為qgsapplication.h的成員,但它在構建時會給出“未定義的引用”錯誤。
以下只是我無法正常工作的測試。 我的Pro文件是:
QT += core gui xml
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = QgisWindow
TEMPLATE = app
DEFINES += QT_DEPRECATED_WARNINGS
SOURCES += \
main.cpp \
mainwindow.cpp
HEADERS += \
mainwindow.h
FORMS += \
mainwindow.ui
# QGIS
INCLUDEPATH += "C:/OSGeo4W64/apps/qgis-rel-dev/include"
INCLUDEPATH += "C:/OSGeo4W64/include"
LIBS += -L"C:/OSGeo4W64/apps/qgis-rel-dev/lib" -lqgis_core -lqgis_gui
DEFINES+=CORE_EXPORT=
DEFINES+=GUI_EXPORT=
# QGIS
main.cpp是:
#include <QApplication>
#include <qgsapplication.h>
int main(int argc, char *argv[])
{
QgsApplication app(argc, argv, true);
QgsApplication::setPrefixPath("C:/OSGeo4W64/apps/qgis-dev", true);
int retval = app.exec();
QgsApplication::exitQgis();
return retval;
}
然后它無法生成/編譯此錯誤:
main.cpp:20: error: undefined reference to `QgsApplication::QgsApplication(int&, char**, bool, QString const&, QString const&)'
實際上,我正在移植我兩年前制作的PyQgis應用程序,由於我對Qt Creator相當陌生,所以我一開始就陷入了困境。
我發現上述項目的正確組合,使Qt可以導入Qgis庫並構建應用程序:
要啟動Qt Creator,請使用以下.bat文件:
Creator.bat :
ECHO Setting up QGIS DEV ENV
set PYTHONPATH=
set OSGEO4W_ROOT=C:\OSGeo4W
call "%OSGEO4W_ROOT%\bin\o4w_env.bat"
@set QMAKESPEC=win32-msvc2010
@set PATH=%OSGEO4W_ROOT%\bin;%OSGEO4W_ROOT%\apps\qgis-ltr-dev\bin;%PATH%
@set INCLUDE=%INCLUDE%;%OSGEO4W_ROOT%\include;%OSGEO4W_ROOT%\apps\qgis-ltr-dev\include
@set LIB=%LIB%;%OSGEO4W_ROOT%\lib;%OSGEO4W_ROOT%\apps\qgis-ltr-dev\lib
path %OSGEO4W_ROOT%\bin;%SYSTEMROOT%\System32;%SYSTEMROOT%;%SYSTEMROOT%\System32\wbem;C:\Program Files (x86)\Git\bin;C:\Tools\QtCreator\bin;%PATH%
set VS100COMNTOOLS=C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\Tools
call "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\vcvarsall.bat" x86
start "Qt Creator" /B C:\Qt\Qt5.9.0\Tools\QtCreator\bin\qtcreator.exe %*
PRO文件:
QT += core gui xml
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = 1_hello_world_qgis_style
TEMPLATE = app
DEFINES += QT_DEPRECATED_WARNINGS
SOURCES += main.cpp
## QGIS
INCLUDEPATH += "C:/OSGeo4W/include"
INCLUDEPATH += "C:/OSGeo4W/apps/qgis-ltr-dev/include"
LIBS += -L"C:/OSGeo4W/apps/qgis-ltr-dev/lib" -lqgis_core -lqgis_gui
DEFINES+=CORE_EXPORT=
DEFINES+=GUI_EXPORT=
## QGIS
main.cpp文件(改編自Tim Sutton的示例 )
// Qt Includes
#include <QApplication>
// QGIS Includes
#include <qgsapplication.h>
#include <qgsproviderregistry.h>
#include <qgssinglesymbolrendererv2.h>
#include <qgsmaplayerregistry.h>
#include <qgsvectorlayer.h>
#include <qgsmapcanvas.h>
int main(int argc, char ** argv)
{
// Start the Application
QgsApplication app(argc, argv, true);
app.setPrefixPath("D:/GIS");
QString myPluginsDir = "<path to Qgis plugins dir>";
QString myLayerPath1 = "<path to shapefile 1>";
QString myLayerBaseName1 = "Layer1";
QString myLayerPath2 = "<path to shapefile 2>";
QString myLayerBaseName2 = "Layer2";
QString myProviderName = "ogr";
// Instantiate Provider Registry
QgsProviderRegistry::instance(myPluginsDir);
// create maplayer instances
QgsVectorLayer * mypLayer1 = new QgsVectorLayer(myLayerPath1, myLayerBaseName1, myProviderName);
QgsVectorLayer * mypLayer2 = new QgsVectorLayer(myLayerPath2, myLayerBaseName2, myProviderName);
QgsSingleSymbolRendererV2 *mypRenderer1 = new QgsSingleSymbolRendererV2(QgsSymbolV2::defaultSymbol(mypLayer1->geometryType()));
QgsSingleSymbolRendererV2 *mypRenderer2 = new QgsSingleSymbolRendererV2(QgsSymbolV2::defaultSymbol(mypLayer2->geometryType()));
QList <QgsMapCanvasLayer> myLayerSet;
mypLayer1->setRendererV2(mypRenderer1);
mypLayer2->setRendererV2(mypRenderer2);
// Add Vector Layers to the Layer Registry
QgsMapLayerRegistry::instance()->addMapLayer(mypLayer1, true);
QgsMapLayerRegistry::instance()->addMapLayer(mypLayer2, true);
// Add Layers to the Layer Set
myLayerSet.append(QgsMapCanvasLayer(mypLayer1, true));
myLayerSet.append(QgsMapCanvasLayer(mypLayer2, true));
// Create the Map Canvas
QgsMapCanvas * mypMapCanvas = new QgsMapCanvas(0, 0);
mypMapCanvas->setExtent(QgsRectangle(-63.50, -28.10, -58.33, -24.00)); // Chaco
mypMapCanvas->setWheelAction(QgsMapCanvas::WheelAction(2) , 1.2);
mypMapCanvas->enableAntiAliasing(true);
mypMapCanvas->setCanvasColor(QColor(255, 255, 255));
mypMapCanvas->freeze(false);
// Set the Map Canvas Layer Set
mypMapCanvas->setLayerSet(myLayerSet);
mypMapCanvas->setVisible(true);
mypMapCanvas->setWindowTitle("GIS DSH");
mypMapCanvas->refresh();
// Start the Application Event Loop
int retval = app.exec();
app.exitQgis();
return retval;
}
路徑是硬編碼的(不良的編程習慣),但是僅用於此測試。
現在它運行正常。 請查看我在gis.stackexchange.com上的帖子, 以獲取Qt Creator Build&Run配置的鏈接和屏幕截圖。
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