Creating a QApplication with Matlab Engine

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Preetham Chalasani 2018-4-17

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https://ww2.mathworks.cn/matlabcentral/answers/395535-creating-a-qapplication-with-matlab-engine

评论： Preetham Chalasani 2018-4-17

I'm trying to create a qt application with matlab engine. The program is throwing Segmentation fault when it tires to create a QApplication object. Following is the sample code that seg faults.

#include <QApplication>
int main(int argc, char **argv)
{
  QApplication application(argc, argv);
  return 0;
}

Following is the CMakeLists.txt that goes along with this.

cmake_minimum_required(VERSION 3.4)
find_package(Qt5Widgets)
find_package(Matlab REQUIRED COMPONENTS ENG_LIBRARY MX_LIBRARY)
include_directories(${Matlab_INCLUDE_DIRS})
add_executable( example main.cpp)
target_link_libraries(example ${Matlab_LIBRARIES} Qt5::Widgets )

I tried compiling against 2017a and 2018a, but no luck.

Any help would be much appreciated.

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Preetham Chalasani 2018-4-17

在 MATLAB Online 中打开

I managed to find the problem. It was linking against different libraries from different matlab versions. After cleaning that up and making sure all the libraries are from 2018a, now the program seg faults at application.exec

#include <QApplication>
int main(int argc, char **argv)
{
  QApplication application(argc, argv);
  return application.exec();
}

Preetham Chalasani 2018-4-17

It seems that libQt5XcbQpa.so.5 was creating a problem. It was being dynamically loaded from the $matlabroot/bin/glnxa64 instead from /usr/lib/x86_64-linux-gnu/ and creating a compatibility issue. Renaming $matlabroot/bin/glnxa64/libQt5XcbQpa.so.5 was my temporary fix.

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