I am trying to lock a chunk, read a UInt32 from the start and a BitmapPtr
from the end and I had this working perfectly using C with
MemHandle recHandle;
MemPtr recPtr;
UInt16 theSize;
BitmapPtr pSig;
UInt32 nID;
recHandle = DmQueryRecord(m_db, m_nPointer);
recPtr = MemHandleLock(recHandle);
theSize = MemPtrSize(recPtr);
pSig = (BitmapPtr)MemPtrNew(theSize);
MemMove(&nID, recPtr, sizeof(UInt32));
MemMove(pSig, recPtr[sizeof(UInt32)], MemPtrSize(recPtr)-sizeof(UInt32));
MemHandleUnlock(recHandle);
I know that this is messy - but for various reasons it wouldn't work well
for me using structs - however - when I move the app to C++ it will not
compile at all - the line
MemMove(pSig, recPtr[sizeof(UInt32)], MemPtrSize(recPtr)-sizeof(UInt32));
gives me an "invalid type" error referring to the recPtr[sizeof(UInt32)]
part - I have tried doing recPtr+=sizeof(UInt32) also but it did not like
it.
Now - I know that this error is valid C++ because I tried doing the same
thing in Visual C++ and it would not compile either - however I would like
to know how I can accomplish this - ie. given a void pointer advance it x
bytes and read from the end - I have had a look through all the Memory
Manager functions but there does not seem to be anything there.
Thanks guys 'n' gals.
Fergal....
PS. I seem to remember offering a prize brought in a lot of responses last
week - so free pint of Guiness for the first correct answer pulled out of
the hat!!
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