Qt Creator error “No such file or directory” when using boost in mongocxx

SimonR

Strange, it's compiling now. But when I try to access a database using

mongocxx::instance inst{
mongocxx::client conn{ mongocxx::uri{"connection string goes here"} };
bsoncxx::builder::stream::document document{};

, I get lots of errors. I think these are linking errors.

Please excuse that I ask a lot, but I'm new to Qt Creator.

SGaist

Hi,

Are you sure that the libraries are of the correct architecture and built by the same compiler ?

SimonR

The compiler used for building the driver was MSVC, so that might be an issue because Qt Creator uses MinGW. How can I change the compiler?

mrjj

@SimonR
Hi
Use Qt maintenance tool to install the visual studio version of Qt for 2017/2019 32/64 VS
and then go and download the compiler from Microsoft site.

SimonR

@mrjj
Can you please provide me better guide how to change the compiler? I've looked it up in the internet but I haven't found anything useful. Ans can I still compile QML applications with MSVC?

SGaist

Well: go to the Microsoft website, download the Visual Studio installer, then execute it.

As for Qt Quick, the compiler has no role here. As long as you have the modules built, it will work.

SimonR

So, I have Visual Studio now, anything else I have to do? The compiler is still MinGW.

SGaist

As @mrjj already suggested, did you install the MSVC build of Qt ?

SimonR

When I open Qt Maintenance Tool, it looks like this:

jsulm

@SimonR Did you select Kit configured for MSVC compiler/Qt to build you project?

SimonR

I've selected the right compiler now,

but when I try to run the program, I get an error.

When I open the kits section, it shows some warnings:

Is this normal? Or do I have to set up something else? Also, I found out that you can change it compiler, but it only shows amd64 and x86 architecture. I have an Intel processor, can I still use the amd64 because I haven't found the right settings for Intel processors?

jsulm

@SimonR Run it through debugger - looks like it is crashing.

SimonR

So I've set up the compiler now, but when I run the application I get errors:

I don't know why the language is German, because it's set to English. But as far as I know, those errors are linking errors, so I guess the libraries are not included correctly.

Here is my .pro file:

QT += quick

CONFIG += c++17

DEFINES += QT_DEPRECATED_WARNINGS

SOURCES += \
        main.cpp \
        signIn.cpp \
        signUp.cpp

INCLUDEPATH += C:/mongo-cxx-driver-3.4.1/include/bsoncxx/v_noabi \
               C:/mongo-cxx-driver-3.4.1/include/mongocxx/v_noabi \
               D:/boost_1_72_0

RESOURCES += qml.qrc

TRANSLATIONS += \
    LogIn_en_CA.ts

QML_IMPORT_PATH =

QML_DESIGNER_IMPORT_PATH =

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

HEADERS += \
    signIn.h \
    signUp.h

LIBS += -LC:/mongo-cxx-driver-3.4.1/lib -lbsoncxx \
        -LC:/mongo-cxx-driver-3.4.1/lib -lmongocxx

jsulm

@SimonR Looks like you're not linking properly against mongocxx. Which compiler was used to build those libraries and are they 32bit or 64bit?

SimonR

I've played with the setting a bit and now, it compiles, but it doesn't run and shows an error:

And when it try do run the debugger, it also shows an error:

jsulm

@SimonR The last error says what is wrong and what needs to be done

SimonR

So, i can compile the project now with MSVC, but when I try to make an connection using

mongocxx::instance inst{};
mongocxx::client conn{ mongocxx::uri{"my connection string"} };
bsoncxx::builder::stream::document document{};

it throws the same error as before:

When I delete the libs part in the .pro file, it works again and keeps working, until I include the libs again and try to use something from mongocxx.

SGaist

As a test, copy the dlls from that library in the same folder as your executable.

SimonR

@SGaist no, that didn't help. Still the same error.

SGaist

Then check that you have all the related dependencies available.