Thread: Use address offset to access struct member without losing Type, is it possible?

Hi, Gurus,

Attempting to use variable to access struct member. Couldn't imagining it's doable by using name reference. But address offset works. The last thing has to be variable is the data type.

Code:

typedef struct
{
char val0;
int val1;
long val2;
} TEST_STRUCT

void main(void)
{
int pOffset;
TEST_STRUCT testStruct;
testStruct.val0 = 0xAB;
testStruct.val1 = 0xDCBA;
testStruct.val2 = 0xABCD
pOffset = (void *)&testStruct.val2 - (void *)&testStruct.val0;    // or use offsetof macro
printf("0x%X.\n", *(long *)(&testStruct.val0 + pOffset);           //0xABCD
} // end of main

Please advise a smarter way to make struct element access variable, various type for casting.

Great thanks,

It's a good thing he figured it out on his own, because I have no idea what he was asking. (I was going to post about offsetof but he has that covered, so I really don't know what it is he wants.)


Quzah.