Pass matlab array to c function as mxArray

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Bogdan Iliuta 2019-12-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/496327-pass-matlab-array-to-c-function-as-mxarray

评论： Bogdan Iliuta 2019-12-16

Hi,

I'm trying to pass a matlab array to a C function but the coder translates the array to a double[] type and I would need a mxArray * type.

Here is the Matlab code:

coder.cinclude('container_wrap.h');
coder.ceval('put_mxArray', 'key', [3 4 5 6]);

The container_wrap.h contains the declaration of put_mxArray:

#ifndef __CONTAINER_H__
#define __CONTAINER_H__
#ifdef __cplusplus
extern "C" {
#else
#include <stdint.h>
#endif
typedef struct mxArray mxArray;
void put_mxArray(char * key, mxArray * val);
void put_uint16_t(char * key, uint16_t val);
uint16_t get_uint16_t(char *key);
#ifdef __cplusplus
}
#endif
#endif /* __CONTAINER_H__ */

The generated code by the coder is this (this is just the piece of generated code that calls put_mxArray):

double dv23[4];
dv23[0] = 3.0;
  dv23[1] = 4.0;
  dv23[2] = 5.0;
  dv23[3] = 6.0;
  emxInit_uint8_T(&r18, 3);
  emxInit_real_T(&r19, 3);
  put_mxArray(cv0, dv23);

Is there a way to force the coder to generate code that passes the array as mxArray ? Can I use the mxArray inside my C code or mxArrays are just for Matlab internal use (can be used only by the generated C code or mex files) and I have to use the more basic types in my C code?

Thank you.

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Bogdan Iliuta 2019-12-16

As a more generic question. According to this link I should be able to pass mxArrays in both ways between Matlab and C functions. Do you happen to have any example that does this?

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