Re: C MEX S-Function Builder


Hello Ashish,

Many thanks for your reply.I also do not understand what is going
wrong and about to go mad really. Anyway, i tried to use union once
more:

Just before initialization function,

typedef union { uint8_T uvalue[8];
real_T d;
} UnionNum;

static void mdlOutputs(SimStruct *S, int_T tid)

{
int_T i;
int_T width = ssGetOutputPortWidth(S,0);

InputPtrsType uPtrs = ssGetInputPortSignalPtrs(S,0);

uint8_T *y = (uint8_T *)ssGetOutputPortSignal(S,0);
UnionNum num;
num.d = uPtrs ;

This is incorrect, the assignment shoult be:

num.d = *uPtrs[0];

uPtrs is a pointer to a pointer to the input so you cannot assign it
directly to a double.

Also try adding this line for debugging:

ssPrintf("sizeof union = %d\n",sizeof(num));

If the value printed is greater than 8 that means your machine doesn't
support a uint8s and so uint8_T is actually something larger. In that
case you'll have to do some bitwise AND and shifting math to get your
result.


for(i=0; i<width; i++)
{
y[i] = num.uvalue[i];

}
}

This time it gives me this error message :

>> mex double2integer.c
Error double2integer.c: 79 operands of = have illegal types `double'
and `pointer to const pointer to const void'

Why does it have problem with 'double'? Do you see anything to
correct here? I appreciate your help again. Thank you.

Regards,
Cahit

HTH,
Ashish.

.

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