Compiler / MEX using C help

2013 6 17
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Hi all,
I compiled a matlab function using the compiler toolbox into a dll, and I am trying to call it from my C program. For some reason, the program hangs at the mlfSimpsum(...) line below. Anyone see a mistake I made? The matlab function is very simple:
function c = simpsum(a,b)
c = a + b;
end
My C code:
#include <stdio.h>
#include "main.h"
#include "SimpleSumDemo.h"
int main(void)
{
mxArray *a_ptr, *b_ptr;
mxArray *c_ptr=NULL;
double *c;
a_ptr = mxCreateDoubleScalar(2);
b_ptr = mxCreateDoubleScalar(7);
/* Call the MCR and library initialization functions */
if( !mclInitializeApplication(NULL,0) )
{
fprintf(stderr, "Could not initialize the application.\n");
exit(1);
}
if (!SimpleSumDemoInitialize())
{
fprintf(stderr,"Could not initialize the library.\n");
exit(1);
}
// Call the implementation function
mlfSimpsum(1,&c_ptr,a_ptr,b_ptr);
c = mxGetPr(c_ptr);
printf("2 + 7 = %d\n",&c);
// Call the library termination function
SimpleSumDemoTerminate();
// Clean up references (very important to prevent memory leaks!)
mxDestroyArray(a_ptr);
mxDestroyArray(b_ptr);
mxDestroyArray(c_ptr);
// Call the MCR termination function
mclTerminateApplication();
return 0;
}

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Leor Greenberger
Leor Greenberger 2013-6-17
I moved
a_ptr = mxCreateDoubleScalar(2);
b_ptr = mxCreateDoubleScalar(7);
to after the mclInitializeApplication and it now works. However, I get an output now of "2 + 7 = 1638144"
What am I doing wrong?
Leor Greenberger
Leor Greenberger 2013-6-17
编辑：Leor Greenberger 2013-6-17
Fixed! Although, I wonder if its possible to return a type int and not double?

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