MCR issue at initialization

I'm facing a weird issue. My Application can use MATLAB code embedded in plugin DLL. I've generated C++ shared dll using MATLAB Compiler 4.18. Two months ago everything went fine, the Matlab generated dll was used by another dll which is a wrapper for my application written in C++.

Now I want to build another MATLAB dll and wrap it the same way, but the libInitialize() call fails.

Here is part of the code doing initializations :

// in the wrapper DLL a constructor is initializing the MATLAB part
MyDll::MyDll()
{
    mclmcrInitialize();
    if (mclInitializeApplication(NULL, 0))
      if (myLibInitialize())
         ...
}

When debugging i've found that the crash is here:

   bool myLibInitializeWithHandlers(
      mclOutputHandlerFcn error_handler,
      mclOutputHandlerFcn print_handler)
  {
      int bResult = 0;
    if (_mcr_inst != NULL)
      return true;
    if (!mclmcrInitialize())
      return false;
    if (!GetModuleFileName(GetModuleHandle("myLib"), path_to_dll, _MAX_PATH))
      return false;
      {
          mclCtfStream ctfStream = 
              mclGetEmbeddedCtfStream(path_to_dll);
          if (ctfStream) {
              bResult = mclInitializeComponentInstanceEmbedded(   &_mcr_inst,
                                                                  error_handler, 
                                                                  print_handler,
                                                                  ctfStream);
              mclDestroyStream(ctfStream);
          } else {
              bResult = 0;
          }
      }  
      if (!bResult)
      return false;
    return true;
  }

Crash in mclInitializeComponentInstanceEmbedded which i can't debug trace since it's part of MCR. I've noticed, though, that _mcr_inst pointer is always NULL. Is it the source of the issue?

I've lost my mind since the same code worked perfectly two months ago on my PC. I changed nothing, MATLAB is still 2012b, Matlab Compiler 4.18 and MCR installed on my Windows 7 64bit.

I guess the issue is linked to CTF acces problem. I tried to build my Matlab C++ DLL with no ctf embedded, same result.

I tried with simple matlab code in one .m file, same result.

Any suggestions appreciated.

Bruno

Answer 1

[Tao Cui]

not sure if your problem was solved since this is an old post. I have encountered same issue and this post solved my problem: https://stackoverflow.com/questions/18512801/call-matlab-dll-from-c-fail-to-initialize-the-library

Simple solution: do not include Matlab generated CPP files into your project, just use the header and the lib.

Answer 2

[Jerome Mai]

You need to delete the mcrCache folder to get it working again.

Run this in Matlab to find out the folder path:

mcrcachedir

It may be something like:

C:\Users\<user>\AppData\Local\Temp\<user>\mcrCache*.*\