QGiS Windows Source Build

[xanthas]

@Pl45m4
So what I have understood is that when I download all dependencies and build QGiS from source, I should either use Qt to compile and build libraries or else I should use visual studio to build and compile it, right?
Further, to make the UI and backend codes I should use the same compiler from which I had made the QGiS library, Am I right?

What I have understood is the same thing discussed here also, I guess.

[jsulm]

@xanthas said in QGiS Windows Source Build:

right?

No.
Qt and visual studio are two completely different things.
Qt is a C++ framework, Visual Studio is a IDE.
What @Pl45m4 wrote is: you should use MSVC as compiler + Qt built with MSVC.
Or you find (or build by yourself) QGIS built with MinGW + Qt built with MinGW.
Reason: you cannot mix different C++ compiler (like you do now: MSVC + MinGW).

[abhishek999]

can you give me step by step procedure to integrate qgis project in qt to show map in qt C++
i am also facing same issue @jsulm

[jsulm]

@abhishek999 said in QGiS Windows Source Build:

can you give me step by step procedure

In the first post in this thread there is a link to a step by step explanation, follow it...

[abhishek999]

i am facing prolem

here is my .pro file
QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++17

You can make your code fail to compile if it uses deprecated APIs.

In order to do so, uncomment the following line.

#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0

SOURCES +=
main.cpp
mainwindow.cpp

HEADERS +=
mainwindow.h

FORMS +=
mainwindow.ui

Include QGIS headers and libraries manually

INCLUDEPATH += C:\OSGeo4W\apps\qgis-qt6-dev\include

LIBS += C:/OSGeo4W/apps/qgis-qt6-dev/lib/qgis_3d.lib
C:/OSGeo4W/apps/qgis-qt6-dev/lib/qgis_analysis.lib
C:/OSGeo4W/apps/qgis-qt6-dev/lib/qgis_app.lib
C:/OSGeo4W/apps/qgis-qt6-dev/lib/qgis_native.lib
C:/OSGeo4W/apps/qgis-qt6-dev/lib/qgis_server.lib

INCLUDEPATH += C:/OSGeo4W64/include

Default rules for deployment.

qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

[abhishek999]

@jsulm @Christian-Ehrlicher
can you please tell me what exact is the problem i have reinstall qt ,Qgis ,OSGeo4W multiples time but still same problem i am facing

[Christian Ehrlicher]

You still doing the same thing as in your first post - you use a Qt compiled for MinGW and try to link it against a QGis compiled against MSVC. This will not work out - no matter how often you install something...

[abhishek999]

can you give me the steps to fix this @Christian-Ehrlicher

[jsulm]

@abhishek999 Again: you have to use Qt built with MSVC compiler. So, install Qr for MSVC and use it...

[xanthas]

@abhishek999 Currently what I am doing is that rebuilding QGiS using MSVC
If I get anything relevant and the steps starts to works
I will share it here
Please do the same (sharing it here) if you get anything or procedure that has to be followed

[Bonnie]

@Christian-Ehrlicher Surprisingly who you just replied is not the OP :) but they are making, or were making the same mistake.

[abhishek999]

here is the kit that i have selcted
![Screenshot (12).png]

and i am getting this error @jsulm @Christian-Ehrlicher

(https://ddgobkiprc33d.cloudfront.net/a0de40c2-7bda-4422-ab48-b948de7f128c.png)

[jsulm]

@abhishek999 Please post errors as text, not pictures.
You should search for the first error or post the whole build log here as text.

[JonB]

@abhishek999
You posted just this and I tried to answer in your annoying post at https://forum.qt.io/topic/159740/qt-creator-and-qgis-integration-problem/2. But you have ignored that. So in addition to calling everyone out by name there to answer your question you then don't respond to answers there and have another topic running with same question here, and people answer in one place and don't know you are making them also answer in another. Do you see how irritating this for people trying to respond to you?

[abhishek999]

@JonB
Apologies for the confusion. I’ve deleted the previous post and will keep my questions in one place from now on.

I successfully included the library, but when I try to display the map in Qt, I encounter the following error (see screenshot). Any suggestions on how to resolve this issue?

[jsulm]

@abhishek999 You're not linking properly one of the required libs. Please show your pro file (as text).

[abhishek999]

@jsulm

QT += core gui widgets xml

CONFIG += c++17

# QGIS include directory
INCLUDEPATH += C:/OSGeo4W/apps/qgis-ltr/include
INCLUDEPATH += C:/OSGeo4W/apps/qgis/bin
INCLUDEPATH += C:/OSGeo4W/apps/Qt5/bin
INCLUDEPATH += C:/OSGeo4W/apps/qgis-ltr/include/qgis
INCLUDEPATH += C:/OSGeo4W/share/proj/proj.db

# QGIS library directory with required libraries
LIBS += -LC:/OSGeo4W/apps/qgis-ltr/lib -lqgis_core -lqgis_gui -lqgis_analysis -lqgis_3d -lqgis_native

SOURCES += \
    main.cpp \
    mainwindow.cpp

HEADERS += \
    mainwindow.h

FORMS += \
    mainwindow.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

[jsulm]

@abhishek999 What exact Qt version did you use to build QGIS? Is it the same you're using to build the application?

[abhishek999]

@jsulm i am using qt 5.15.2

[jsulm]

@abhishek999 You did not answer the second question.