Please forgive me if I'm being thick...
Can you take a pointer to a database record, increment the pointer, cast the pointer
as a new pointer to a different type, and de-reference the new pointer (with the
assumption that there is enough room within the allocated database record to
accommodate the increments and cast)?
For instance:
typedef struct {
Int16 m;
} TypeA;
typedef struct {
Int16 n;
} TypeB;
VoidHand vHand;
TypeA *aPtr;
TypeB *bPtr, bStruct;
Int16 x;
vHand = DmNewRecord(someOpenDB, dmMaxRecordIndex, sizeof(TypeA) + sizeof(TypeB));
aPtr = MemHandleLock(vHand);
bPtr = (TypeB*)(aPtr + 1);
x = bPtr->n;
The LAST statement is the one I'm curious about - should it work? I know I didn't
initialize the data in the record or check the return values from the functions and
that I'm trying to store some unknown value in "x". I know that I CAN do the
following:
MemMove(&bStruct, aPtr + 1, sizeof(TypeB));
Thanks
trib
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David Tribble, INRI Hawaii
(808) 625 2118 (v) (808) 625 6315 (f)
