Convert to BYTE PTR

[Jay Straffer]

LOCAL dwOffset AS DWORD
LOCAL pData As BYTE PTR
dwOffset = &H654321
@pData = CBYT PTR(dwOffset)

See where I have it doing "CBYT PTR(...)" ? I want to convert dwOffset to a BYTE PTR, but I know of only CBYT(...). Is there a way?

Thanks.

[Michael Mattias]

Insufficient code shown.

As written, pData is zero, meaning this will GPF (or ERR 9, but ON ERROR is not in use).

What do you want to do, take the byte value at 'dwoffset' and put it somewhere? (Like, into a byte variable?) Then you need a byte variable to store it in.

Maybe you mean something like ...

LOCAL data as BYTE
LOCAL pData AS BYTE PTR 

   pData  = (ADDRESS of the base of whatever dwOffset is from) + dwoffset 
   data     = @pData

.. something like that?

MCM

[Paul Squires]

Jay,

If you are not comfortable using pointers then you could always use PB's PEEK and POKE statements. IIRC, the new versions of those statements are extremely fast.

[John Gleason]

Maybe something like this?

#COMPILE EXE
#DIM ALL

FUNCTION PBMAIN () AS LONG

    LOCAL dwOffset AS DWORD
    LOCAL pData AS BYTE PTR
    LOCAL myData AS STRING
    dwOffset = &H654321
    myData = REPEAT$(1400000, CHR$(3,123,33,51,66,211,92,244))  'any data string
    pData = STRPTR(myData) + dwOffset
    ? MKBYT$(@pData)        'this shows you the byte at offset &H654321
    ? STR$(@pData)          'this shows you the value of the byte at offset &H654321

END FUNCTION

[Jay Straffer]

Thanks a bunch, guys.