I've trouble reading the value of a string passed to MATLAB as an S-Function parameter in C++:
Throws the following exception:
Program: C:\windows\SYSTEM32\MSVCP140D.dll File: C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\include\xstring Line: 1181
Expression: invalid null pointer
For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts.
(Press Retry to debug the application) MATLAB.exe has triggered a breakpoint.
Exception thrown at 0x00007FFB6C9A0A63 (test.mexw64) in MATLAB.exe: 0xC0000005: Access violation reading location 0x0000000000000000. > throw_segv_longjmp_seh_filter() throw_segv_longjmp_seh_filter(): invoking THROW_SEGV_LONGJMP SEH filter > throwSegvLongjmpFilter() MATLAB.exe has triggered a breakpoint.
The program ' MATLAB.exe' has exited with code 0 (0x0).
For debugging purposes I splitted it up:
const mxArray* pArrayValue = ssGetSFcnParam(S,0); const char* pCharArray = mxArrayToString(pArrayValue); std::string str(pCharArray);
pCharArray points to:
I am using VS 14.0.25431.01 Update 3 on Win 10 Pro 17134.165 with Matlab 2018a. I found code in our companies repository where both of the above code snippets are working, in MATLAB 2013b, what am I doing wrong? Is this syntax invalid in 2018a?