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CByte keyword?

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  • Lance Edmonds
    It would be easiest to use a dynamic string, thus:
    A$ = CHR$(65,66,67,68,69,70,71) ' or use "abcedf", etc
    PRINT #1, A$
    You could use a byte array, but you'd then have to reference each byte individually to construct the 7 byte sequence... hence, using a dynamic string is the easiest way.

    Another approach is to use a combination of both methods, using a UNION... a brief example of the concept follows:
    UNION commtype
      bData(1 TO 7) AS BYTE
      sData AS STRING * 7
    DIM x AS commtype
    FOR z% = 1 TO 7
      x.bData(z%) = 64 + z%
    NEXT z%
    PRINT #1, x.sData
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  • Tim Seyfarth
    Guest replied
    This is where I am really confused... I am assembling a string
    byte values that will need to be sent out through the COM port.
    The size is always greater than 5 byes (there are actually seven
    parts that make up the byte string).

    So I guess there are 3 questions:
    1. Is it appropriate to use a byte array
    2. Is it more appropriate to use a var dimensioned as byte but how do you set the length?
    3. When ready to send to the serial port then it have to do
    something like Print #1,chr$(bytevar)

    Thanks everyone!


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  • Buck Huffman

    I believe the CBYT function is what you're looking for. You can
    find the description in the PowerBasic Reference Guide under the
    heading CBCD, CBYT, CBDL, etc... . That's on page 59 of my manual
    (not sure if they're all the same )

    works like this
    bytevar? = CBYT(anynumber)

    you really shouldn't need this though, according to the manual
    PB converts this automatically. like this.

    thisbyte? = yourinteger%

    haven't tried it, should work though


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  • Mel Bishop
    I'm not quite sure I fully understand the question but here's my
    best guess:

    If you have an ASCII value or HEX string that you need sent over
    the comm port, you need to convert it to a CHR$() for transmission.

    Assuming you have your comm port opened as #1

    t$ = "The Quick Brown Fox"
    for x = 1 to len(t$)
    h = asc(mid$(t$,x,1)) '<==> The ASCII value for the letter
    print #1,chr$(h);
    next x

    A more efficient example, however, would be deleting line 3 and
    replace line 4 with:

    print #1,mid$(t$,x,1);

    This example should be relevent for just about any occurance
    you would run across.

    Hope this helps. If it doesn't, how about posting a snippet
    of what you are trying to accomplish and let's go from there.


    [This message has been edited by Mel Bishop (edited April 08, 2002).]

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  • Tim Seyfarth
    Guest started a topic CByte keyword?

    CByte keyword?

    I am a newbie to PB. My first effort with PB involves sending/receiving
    data through a Com port. The data is sent in hex format. In VB you can
    convert an integer value to a byte value using CByte(integer). How is
    this addressed in PB and where in the book can I find it? I have
    searched everywhere!