C Language
Respected Sir,
How can I determine the byte offset of a field within a structure?
How can I access structure fields by name at run time?
please help me sir .
Thank you sir !!!
View Answers
June 14, 2011 at 7:24 PM
hi, Srinivasan
(i)In c offsetof() macro is defined in <stddef.h>. With the help of it you can compute the offset field in structure struct s as offsetof(type,field).
#include <stddef.h>
size_t offsetof(type, field);
e.g.
struct st { int a, b; };
offsetof(struct st, b);
(char *) casting arranges that the offset so computed is a byte offset.
(ii)Maintain the offsets field computed by the offsetof() macro.
*(int *)((char *)stp + offsetf) = value;
in the above the value of f can be set indirectly, here stp is the pointer to an instance of the srurcture and the field is an int which has the offset offsetf.
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