It is relatively straightforward to write a structure out using
fwrite(): fwrite(&somestruct, sizeof somestruct, 1, fp);
and a corresponding fread invocation can read it back in.
(Under pre-ANSI C, a (char *) cast on the first argument is required. What's important is that fwrite() receive a byte pointer, not a structure pointer.) However, data files so written will *not* be portable .
Note also that if the structure contains any pointers, only the pointer values will be written, and they are most unlikely to be valid when read back in.
Finally, note that for widespread portability you must use the "b" flag when fopening the files;
A more portable solution, though it's a bit more work initially, is to write a pair of functions for writing and reading a structure, field-by-field, in a portable (perhaps even human- readable) way.

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