From a GO program on a Raspberry PI I'm trying to call a function(Matlab function converted to C function) and the input to the function is a pointer to a struct and the struct contains pointer to a double(data) and a pointer to an int(size) and two int(allocatedSize, numDimensions). I have tried several ways but nothing has worked, when I have passed the compilation it usually throws a panic: runtime error: cgo argument has Go pointer to Go pointer when I run the program.
sumArray.c
/*sumArray.C*/
/* Include files */
#include "sumArray.h"
/* Function Definitions */
double sumArray(const emxArray_real_T *A1)
{
double S1;
int vlen;
int k;
vlen = A1->size[0];
if (A1->size[0] == 0) {
S1 = 0.0;
} else {
S1 = A1->data[0];
for (k = 2; k <= vlen; k++) {
S1 += A1->data[k - 1];
}
}
return S1;
}
sumArray.h
#ifndef SUMARRAY_H
#define SUMARRAY_H
/* Include files */
#include <stddef.h>
#include <stdlib.h>
#include "sumArray_types.h"
/* Function Declarations */
extern double sumArray(const emxArray_real_T *A1);
#endif
sumArray_types.h
#ifndef SUMARRAY_TYPES_H
#define SUMARRAY_TYPES_H
/* Include files */
/* Type Definitions */
#ifndef struct_emxArray_real_T
#define struct_emxArray_real_T
struct emxArray_real_T
{
double *data;
int *size;
int allocatedSize;
int numDimensions;
};
#endif /*struct_emxArray_real_T*/
#ifndef typedef_emxArray_real_T
#define typedef_emxArray_real_T
typedef struct emxArray_real_T emxArray_real_T;
#endif /*typedef_emxArray_real_T*/
#endif
/* End of code generation (sumArray_types.h) */
main.go
// #cgo CFLAGS: -g -Wall
// #include <stdlib.h>
// #include "sumArray.h"
import "C"
import (
"fmt"
)
func main() {
a1 := [4]C.Double{1,1,1,1}
a2 := [1]C.int{4}
cstruct := C.emxArray_real_T{data: &a1[0], size: &a2[0]}
cstructArr := [1]C.emxArray_real_T{cstruct}
y := C.sumArray(&cstructArr[0])
fmt.Print(float64(y))
}
With this example I get panic: runtime error: cgo argument has Go pointer to Go pointer when I run the program.
I do not how to make it work or if it is possible to make it work. I hope someone can help me or give some direction on how to solve this.