Error using mex : In function 'void mexFunction(int, mxArray**, int, const mxArray**)'

In my mecherMex.cpp, I wright down "void mexFunction (int nlhs,mxArray *plhs[],int nrhs,const mxArray *prhs[]) {", but I dont know why system says my function is 'void mexFunction(int, mxArray**, int, const mxArray**)'. Does any one has same problem?

Answer 1

[James Tursa]

The error is not with mexFunction. The error is with line in your source code:

const int32_t *dims1 = mxGetDimensions(prhs[1]); 

which needs to be this instead:

const mwSize *dims1 = mxGetDimensions(prhs[1]); 

To answer your question as to why you write this signature:

void mexFunction (int nlhs,mxArray *plhs[],int nrhs,const mxArray *prhs[])

but the compiler says the signature is this:

void mexFunction(int, mxArray**, int, const mxArray**)

you have to remember that C/C++ does not pass arrays in argument lists. The square brackets [ ] that look like arrays are in fact interpreted by the compiler as "pointer to" when they appear in argument lists. So this

mxArray *plhs[ ]

in an argument list does not mean "array of pointers to mxArray"

It does mean "pointer to pointer to mxArray", i.e. the [ ] simply gets replaced with "pointer to".

[CHENGXIAN KI]

thanks for ur answer,

I try to instead like u said

but still lots of error

I dont get it

actually I never learned this before

i just want to try data from this web :http://www.cvlibs.net/software/libviso/

so I downloaded the dataset and the code as u saw

in the ReadMe.txt. it says that just run the make.m

and I can see demo.

but I dont know why this make so much trubles

thank you for your answer again

[James Tursa]

Looks to me like you still have mwSize vs int32_t mismatches in your code. You need to fix those up.