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comp.lang.c FAQ list · Question 2.15

Q: How can I access structure fields by name at run time?

A: Keep track of the field offsets as computed using the offsetof() macro (see question 2.14). If structp is a pointer to an instance of the structure, and field f is an int having offset offsetf, f's value can be set indirectly with

	*(int *)((char *)structp + offsetf) = value;

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