Why can't I use matlab function in QT

[Ray_Zh]

I followed the tutorial and used "Library Compiler" to transform ".m" into ".dll" ".h" and ".lib". Why does my program still fail to run?

Here is my ".pro"

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 \
    mat/add_matlab.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

win32:CONFIG(release, debug|release): LIBS += -L$$PWD/./release/ -ladd_matlab
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/./debug/ -ladd_matlab

INCLUDEPATH += $$PWD/mat
DEPENDPATH += $$PWD/mat

INCLUDEPATH += $$quote(D:/Program Files/MATLAB/R2024a/extern/include)
INCLUDEPATH += $$quote(D:/Program Files/MATLAB/R2024a/extern/include/win64)

INCLUDEPATH += $$quote(D:/Program Files/MATLAB/R2024a/extern/lib/win64/microsoft)
DEPENDPATH += $$quote(D:/Program Files/MATLAB/R2024a/extern/lib/win64/microsoft)

win32: LIBS += -L$$quote(D:/Program Files/MATLAB/R2024a/extern/lib/win64/microsoft) -llibmex
win32: LIBS += -L$$quote(D:/Program Files/MATLAB/R2024a/extern/lib/win64/microsoft) -llibmx
win32: LIBS += -L$$quote(D:/Program Files/MATLAB/R2024a/extern/lib/win64/microsoft) -llibmat
win32: LIBS += -L$$quote(D:/Program Files/MATLAB/R2024a/extern/lib/win64/microsoft) -llibeng
win32: LIBS += -L$$quote(D:/Program Files/MATLAB/R2024a/extern/lib/win64/microsoft) -lmclmcr
win32: LIBS += -L$$quote(D:/Program Files/MATLAB/R2024a/extern/lib/win64/microsoft) -lmclmcrrt

[jsulm]

@Ray_Zh said in Why can't I use matlab function in QT:

Why does my program still fail to run?

It fails to link, not to run. Linker fails because it can't find matlab lib. It can't find the lib probably because you used $$PWD in:

LIBS += -L$$PWD/./release/ -ladd_matlab

PWD is current folder when running qmake. Where did you put the matlab libraries? Please post the resulting path from the -L when linker is executed: is that path correct and is the lib in that folder?

Please post error messages as text.

[Ray_Zh]

@jsulm Thanks。 That's the problem. I never doubted this line because it was automatically generated by the program when I imported the library