Access pointer to struct in Matlab Coder
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Hello,
I have a c header file with the following struct and inline function to access the pointer to the struct:
typedef struct {
float field1;
unsigned field2;
} myStruct;
extern myStruct data;
inline myStruct* access_structData (void) {
return &data;
}
I tried to access the pointer to the struct with coder.opaque:
structPtr = coder.opaque('myStruct *','NULL','HeaderFile','struct_header.h')
structPtr = coder.ceval('access_structData')
a = structPtr.field1;
I cannot generate code for this since "??? Attempt to extract field 'field1' from 'coder.opaque'". How can I read and write data to a struct using a pointer? Is there any proper work-arounds?
In c the code for what I try to do would look something like this:
float a = access_structData->field1;
采纳的回答
Darshan Ramakant Bhat
2020-11-27
The struct type is opaque for the MATLAB Coder. So it will not have the information about he fields. Can you please try the below work arounds :
- If you wan to access each fields then write a wrapper to access them like below
float access_struct_field1(void) {
data->field1;
}
unsigned access_struct_field2(void) {
data->field2;
}
then invoke these calls through coder.ceal as necessary.
- Do the struct operation in another wrapper function
Consider you want to do addition of the struct fields, then you can do these operations in another C wrapper function
float myStructOperations(myStruct* aStruct ) {
reutrn (float)(aStruct->field1+aStruct->field2);
}
In MATLAB you can do like below
structPtr = coder.opaque('myStruct *','NULL','HeaderFile','struct_header.h');
structPtr = coder.ceval('access_structData');
output = coder.ceval('myStructOperations',structPtr);
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