Question

I have a function in matlab that writes a file.txt which i use in my qt project.

So,

I have a Matlab file when I get a qt compiled executable to run using the unix(), but I’m getting an error.

the code:

unix('/home/matt/Desktop/PlaneVolumeFinal/PlaneVolumeGui');

the error:

/home/matt/Desktop/PlaneVolumeFinal/PlaneVolumeGui: symbol lookup error: /home/matt/Desktop
/PlaneVolumeFinal/PlaneVolumeGui: undefined symbol: _ZN9QListData7detach3Ev

Answer 1

The problem, as @grungetta is also pointing out, may be related to MATLAB local library path not seeing your Qt libraries, like libQtMultimedia.so, which should normally in a path visible in any shell session through LD_LIBRARY_PATH var.

One way to work around this is explicitly setting the value of LD_LIBRARY_PATH from within a MATLAB running session (and then re-storing it if you need to continue). An example set of commands for your MATLAB script may be:

%*** save local (MATLAB's) LIBRARY PATH
libPathLocal = getenv('LD_LIBRARY_PATH');  

%*** set your global LIBRARY PATH 
PATH_LD_LIBRARY = '/usr/lib/' % or any string containing library files required 
setenv('LD_LIBRARY_PATH', PATH_LD_LIBRARY); 

%*** call binary through 'unix' or 'system'
system('/home/matt/Desktop/PlaneVolumeFinal/PlaneVolumeGui'); 

%*** restore session's MATLAB's library path
setenv('LD_LIBRARY_PATH', libPathLocal);