[Qgis-user] Customized QGIS C++ application development in Windows

[rguru]

Hi,

I am developing a custom map viewer using Qt, C++, QWidgets and QGIS API. I
am not trying to compile QGIS source code. I am trying to show a vector map
using Qt.

For LTR version 3.34.10

1. Installed Visual Studio 2019 community edition (Desktop Development with
C++")
2. Installed qgis-ltr-deps using OSGeo4W network installer
3. Able to include headers
4. I have included my pro file as pro1.pro

Result: Getting lots of compilation errors. I have tried with Visual studio
2019 compiler and MinGW 64 bit. Getting errors in both cases.

I have already gone through the steps available on the internet and tried
ChatGPT. Kindly help me to make a simple map viewer in windows. Thanks in
advance.

Rguru
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QT += core gui widgets xml

CONFIG += c++17

UI_DIR = ./UI
MOC_DIR = ./MOC
OBJECTS_DIR = ./OBJ

TARGET = IEWS_MAP
TEMPLATE = app

DEFINES += QT_DEPRECATED_WARNINGS
DEFINES += _USE_MATH_DEFINES
DEFINES += QT_NO_KEYWORDS
DEFINES += CORE_EXPORT= GUI_EXPORT=
DEFINES += CORE_EXPORT=__declspec(dllimport) GUI_EXPORT=__declspec(dllimport)


SOURCES += \
    display2d.cpp \
    main.cpp

HEADERS += \
    display2d.h

FORMS += \
    display2d.ui

win32 {
    LIBS += -lws2_32
}

OSGEO_QT_LIB_PATH = C:/OSGeo4W/apps/Qt5/lib/
OSGEO_QGIS_LIB_PATH = C:/OSGeo4W/apps/qgis-ltr/lib/
OSGEO_INCLUDE_PATH = C:/OSGeo4W/apps/Qt5/include
OSGEO_QGIS_INCLUDE_PATH = C:/OSGeo4W/apps/qgis-ltr/include


win32 {
    INCLUDEPATH += C:/OSGeo4W/apps/qgis-ltr/include
    LIBS += -L"C:/OSGeo4W/apps/qgis-ltr/lib/" -lqgis_core -lqgis_gui
    INCLUDEPATH += C:/OSGeo4W/apps/Qt5/include
    LIBS += -L"C:/OSGeo4W/apps/Qt5/lib/" -lQt5Core -lQt5Gui
}