How to use c structure in python "?

Question

I have a simple C function.

typedef struct {
    long unsigned int First;
    long unsigned int Second;
    int c;
} FRAGMENTS;

struct out {
    long unsigned int Four;
    FRAGMENTS fragments[10000];
};
struct out test() {
    struct out *out = (struct out *)malloc(sizeof(struct out));
    ...
    return *out
}

How to use this function in Python ? Any example for transform this structure to python object ( using python wrapper ) ?

Why are you returning an int from the C function? The right return type here is an out*. — Chinmay Kanchi
– Chinmay Kanchi, Commented Aug 16, 2011 at 22:49

Martin Thurau · Accepted Answer · 2011-08-16 20:41:42Z

1

Do you have the data already "in" Python (i.e. from the network or a binary file)? Than you an use the struct module.

answered Aug 16, 2011 at 20:41

Martin Thurau

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James O'Doherty · Accepted Answer · 2011-08-16 21:20:59Z

1

The easiest way is to use SWIG to generate a Python wrapper around your C code. You can also use it to generate bindings/wrappers for lots of other scripting languages to.

answered Aug 16, 2011 at 21:20

James O'Doherty

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1 Comment

wberry Over a year ago

For calling the function, and translating input and output to/from Python objects, use SWIG. Using the memory structure directly in Python is not supported because there is no way it could be portable. (Different CPU architectures and compilers may cause sizeof(FRAGMENTS) and the arrangement of its fields to vary.)

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