Weird error on mex compilation

Hello Everybody,

before I get started let me please tell you that I do not know much about c++ programming so in case you answer to my question I would like to ask you kindly to make it as idiot-proof as possible :)

I would like to compile some third party software to control a camera. The code compilation works fine without errors when I do it using MS Visual Studio 2010. However, I get an error when I compile the same code (with the mex-related adjustments) using MATLAB (2015A, 64Bit) and I cannot make any sense of the error.

I attached a very basic example that illustrates the problem. I am including all required libraries necessary to create a object of the class PvDeviceSerial. The libs are provided by producer of the camera.

#include <mex.h.>
#include <stdio.h>
#include <PvDevice.h>
#include <PvDeviceSerialPort.h>
#include <PvDeviceAdapter.h>
void mexFunction(){
 PvDeviceSerialPort lPort;
}

Using the following compilation command:

filename = '$PATH_TO_SOURCE\test.cpp';
mex('-IC:\Program Files (x86)\Pleora Technologies Inc\eBUS SDK\Includes',...
    '-LC:\Program Files (x86)\Pleora Technologies Inc\eBUS SDK\Libraries',...
    filename, '-v');

I get the following error:

Error using mex
   Creating library test.lib and object test.exp
test.obj : error LNK2019: unresolved external symbol "public: virtual __cdecl
PvDeviceSerialPort::~PvDeviceSerialPort(void)" (??1PvDeviceSerialPort@@UEAA@XZ) referenced in function "void
__cdecl mexFunction(void)" (?mexFunction@@YAXXZ)
test.obj : error LNK2019: unresolved external symbol "public: __cdecl PvDeviceSerialPort::PvDeviceSerialPort(void)"
(??0PvDeviceSerialPort@@QEAA@XZ) referenced in function "void __cdecl mexFunction(void)" (?mexFunction@@YAXXZ)
test.mexw64 : fatal error LNK1120: 2 unresolved externals

Compiling the same program in MS VS works fine (exactly the same code, except that "void mexFunction" is replaced my "int main").

I think it may be due to some compiler flags or something like that. I would highly appreaciate any comment on this as I am starting to get desperate. I included the header file with the class declaration. Maybe that helps.

Thanks a lot, Thomas

Answer 1

[James Tursa]

First, get your mexFunction signature correct and try compiling again. Then we can work on other errors. So first change this:

#include <mex.h.>
    :
void mexFunction(){

to this:

#include "mex.h"
    :
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]) {

And re-compile.