calllib crashes MATLAB, no error given.

Hi,

I am trying to call a FORTRAN .dll in MATLAB (r2018b) using the function loadlibrary and calllib. With C++ I wrote the following .h file:

#ifndef _MYMODEL
#define _MYMODEL
#ifdef __cplusplus
extern "C" {
#endif // _cplusplus

	// Functions and data types defined
	void __stdcall MYFUN(char FILEA[], char FILEB[], int *IDTask, int *nErrorCode, int *ErrorCode, double *Props, double *Out1, double *Out2, double *Out3, double *Out4, double *Out5);
#ifdef __cplusplus
}
#endif // __cplusplus

#endif // !_MYMODEL      

In MATLAB, the library is loaded with loadlibrary (no errors). However, while calling the calllib function, MATLAB crashes and does not give an error. I saw the other thread on this (exchanging cdecl for stdcall in C++; https://nl.mathworks.com/matlabcentral/answers/18313-calllib-crashes-matlab-no-error-given), however, my 'mHeader' function does not contain cdecl (and stdcall only in the commented section).

Below, my MATLAB code is included:

%% Input to model
FILEA       = 'PATH\FILEA.txt';
FILEB       = 'PATH\FILEB.txt';
IDTask      = 1;

%% Determine pointers

% input in .h file: 
lpFILEA         = libpointer('cstring', FILEA);
lpFILEB         = libpointer('cstring', FILEB);
lpIDTask        = libpointer('int32Ptr', IDTask);
lpnErrorCode    = libpointer('int32Ptr');
lpErrorCode     = libpointer('int32Ptr');
lpProps         = libpointer('doublePtr');
lpOut1          = libpointer('doublePtr');
lpOut2          = libpointer('doublePtr');
lpOut3          = libpointer('doublePtr');     
lpOut4          = libpointer('doublePtr');
lpOut5          = libpointer('doublePtr');      

%% LoadLibrary
    [notfound, warnings] = loadlibrary('MYMODEL.dll','MYMODEL.h' ,'mfilename', 'mHeader');

%% Call .dll
[~,~, ~, nErrorOut, ErrorCodeOut, PropsOut, Out1_, ~, ~, Out4_, Out5_] ...
    = calllib('MYMODEL', 'MYFUN', lpFILEA, ...
    lpFILEB, lpIDTask, lpnErrorCode, lpErrorCode, lpProps, lpOut1, ...
    lpOut2, lpOut3, lpOut4, lpOut5);

Only the first three arguments as called in calllib are input, the remainder of the variables are output.

Thanks in advance for your help!

Kind regards,

Sara

[Walter Roberson]

Which fortran compiler are you using? Are you using Intel Parallel Studio XE For Fortran? Or are you using gfortran ?

[Sara van Hoogstraten]

Hi Walter,

The .dll is already compiled (as it is external). For C++ I am using Parallel Studio.

KR, Sara

[Walter Roberson]

MATLAB supports fortran compiled with Intell Parallel Studio. If the dll happens to be compiled with gfortran then there could be a problem.

Either way the fortran run-time libraries would have to be locatable. I am having a bit of difficulty in finding the name of the fortran run-time library used by ifort (Intel Fortran compiler)

[Sara van Hoogstraten]

I asked the person that created the .dll and will get back to you on this. Regarding the second point: what is meant with the runtime library? From the organisation that provided the .dll only a .dll and a .lib file where given (?).

[Walter Roberson]

https://software.intel.com/en-us/articles/intel-compilers-redistributable-libraries-by-version

Looking at http://pleiades.ucsc.edu/doc/intel/composer_xe/14.0/compiler_f/main_for/GUID-51CE4CA9-87BF-4225-AD75-08F98D4915F7.htm I suspect it would be libifcoremt.lib that is needed, or perhaps libifcore.lib or perhaps libifcorertd.dll

[Sara van Hoogstraten]

I now downloaded both of the packages. However, in the .h file in Visual Studio, I cannot change the run-time library (as the properties window is empty). The same holds for the .dll file.

[Sara van Hoogstraten]

I just heard back from the developer: they used Microsoft Visual Studio 2015 and the Intel Fortran compiler for building the .dll.