Passing 32-bit Pointers

[Walt Decker]

I've tried to pass 32-bit pointers to procedures but have had little luck. The only way I've been able to use pointers in a procedure is to declare them shared. The semantics I've tried are:

DIM aPtr AS BYTE PTR

aPtr = VARPTR32(SomeVarb)

CALL aProc(aPtr)
Call aProc1(aPtr)

SUB aProc(BYVAL SomePtr AS PTR)

SUB aProc1(BYVAL SomePtr AS DWORD PTR)

Am I missing something?

[Jason McCarver]

You cannot have a PTR as a parameter in SUBs or FUNCTIONs, so use DWORD instead (Unsigned 32 bit)

The technique I use is to pass the parameter as a DWORD...something like this:

DIM aPtr AS BYTE PTR
aPtr = VARPTR32(SomeVarb)

CALL aProc(aPtr)

SUB aProc (BYVAL InPtr AS DWORD)
  DIM SomePtr AS BYTE PTR

  SomePtr = InPtr
  ...
END SUB

HTH,
Jason

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