coder: problem with externally defined structures

Question

Tomas Jurena 2012-8-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/45411-coder-problem-with-externally-defined-structures

Hi, I'd like to generate a C code from an m-function (gc1D.m), which accpets an externally defined structure as an input argument. The same structure is passed on within the m-function to a custom C-function (rfgc1D.c), which reads a data file, performs some operations on that and returns another externally defined structure (through a pointer) and an integer value as an indicator of succesfull reading. Here are header files with a C-function prototype and parts of structures definitions (just the relevant ones):

rfgc1D.h

#ifndef _RFGC1D_H_
#define _RFGC1D_H_
#include "udf_gc1D.h"
extern int rfgc1D(const fluentDataStruct, gcDataStruct *);
#endif

udf_gc1D.h

#ifndef _UDF_GC1D_H_
#define _UDF_GC1D_H_
typedef struct {
  char *path2file;
  
  double grateL;
  
  double grateW;
  
  double grateV;
  
  int nGrateCells;
  
  double Acell;
  
  double *Tenv;
  
} fluentDataStruct;
.     .     .     .
.     .     .     .
.     .     .     .
typedef struct {
  double gasInletT;
  
.     .     .     .
.     .     .     .
.     .     .     .
    critStruct crit;
    relaxStruct relax;
    double *heaterTval;
} gcDataStruct;
#endif

Important fields of these structures are nGrateCells and Tenv from fluentDataStruct and heaterTval from gcDataStruct. There is a piece of code at the end of

rfgc1D.c:

int rfgc1D(const fluentDataStruct fData, gcDataStruct *gcData){
     FILE *datafile;
      .     .     .     .
      .     .     .     .
      .     .     .     .
     for(i=0;i<fData.nGrateCells;i++)
          
        gcData->heaterTval[i] = fData.Tenv[i];
     return 1;
}

The function is called using coder.ceval within the primary function

gc1D.c:

function [] = gc1D(fluentData) %#codegen
          .     .     .     .
          .     .     .     .
          .     .     .     .
          coder.cstructname(fluentData,'fluentDataStruct','extern','HeaderFile','udf_gc1D.h'); 
gcData=gcDataInit(fluentData.nGrateCells); % initialize gcData
        coder.cstructname(gcData,'gcDataStruct','extern','HeaderFile','udf_gc1D.h');
read_succ=coder.ceval('rfgc1D',fluentData,coder.wref(gcData)); %read file
          .     .     .     .
          .     .     .     .
% other local matlab variables are defined here using gcData, including the
% following one
solid.irrad = gcData.heaterEmiss*steffBoltz*gcData.heaterTval(1)^4;
          .     .     .     .
          .     .     .     .

gcDataInit is an m-function for initializing the structure gcData.

gcDataInit.m

function [gcData] = gcDataInit(nCells)
gcData.gasInletT=298.15;
.     .     .     .
.     .     .     .
.     .     .     .
gcData.heaterTval=zeros(1,nCells);
  coder.cstructname(gcData.crit.Ts,'solidTempCritStruct','extern','HeaderFile','udf_gc1D.h');
  coder.cstructname(gcData.crit.Tg,'gasTempCritStruct','extern','HeaderFile','udf_gc1D.h');
  coder.cstructname(gcData.crit.Vg,'gasVelCritStruct','extern','HeaderFile','udf_gc1D.h');
  coder.cstructname(gcData.crit.Rhos,'solidRhoCritStruct','extern','HeaderFile','udf_gc1D.h');
  coder.cstructname(gcData.crit.Yg,'gasYiCritStruct','extern','HeaderFile','udf_gc1D.h');
  coder.cstructname(gcData.crit.Ys,'solidYiCritStruct','extern','HeaderFile','udf_gc1D.h');
  coder.cstructname(gcData.relax.Ts,'solidTempRelaxStruct','extern','HeaderFile','udf_gc1D.h');
  coder.cstructname(gcData.relax.Tg,'gasTempRelaxStruct','extern','HeaderFile','udf_gc1D.h');
  coder.cstructname(gcData.relax.Vg,'gasVelRelaxStruct','extern','HeaderFile','udf_gc1D.h');
  coder.cstructname(gcData.relax.Rhos,'solidRhoRelaxStruct','extern','HeaderFile','udf_gc1D.h');
  coder.cstructname(gcData.relax.Yg,'gasYiRelaxStruct','extern','HeaderFile','udf_gc1D.h');
  coder.cstructname(gcData.relax.Ys,'solidYiRelaxStruct','extern','HeaderFile','udf_gc1D.h');
  coder.cstructname(gcData.crit,'critStruct','extern','HeaderFile','udf_gc1D.h');
  coder.cstructname(gcData.relax,'relaxStruct','extern','HeaderFile','udf_gc1D.h');
  coder.cstructname(gcData,'gcDataStruct','extern','HeaderFile','udf_gc1D.h');
end

When building the project, this error occurs:

gc1D.c:1376: error: request for member ‘data’ in something not a structure or union

This code can be found in the compiled code gc1D.c at the line 1376:

1375: solid.irrad = gcData.heaterEmiss * 5.66E-8 * rt_powd_snf

1376: (gcData.heaterTval->data[0], 4.0);

Apparently, data is not defined as a field of heaterTval in the definition of the structure. What am I doing wrong? What should I do to tell the coder not to define this additional field? I'd appreciate your help!

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Kaustubha Govind 2012-8-8

Tomas: You may want to contact MathWorks Tech Support if you do not receive a response here.

Tomas Jurena 2012-8-9

Thank you for your comment. I can wait for anyone's response for a few more days while working on another part of the project. However, afterwards if I do not get any or I do not resolve the problem myself, I'll ask the Tech Support for help.

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coder: problem with externally defined structures

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