Hello guys

-
Hello guys,

Being HostNameLength a constant, I would love be able to declare a static array as below:
LHostName: array[0.or
LHostName: array[0..
rather than, currently:
LHostName: array[0..HostNameLength - 1] of UTF8Char;

Thanks :D

Comments

  1. Dorin DuminicaAugust 23, 2016 at 8:38 PM

    assuming HostNameLength is say 200

    LHostName: array[0..LHostName: array[0..1] of UTF8Char; is correct
    LHostName: array[0..2] of UTF8Char; is correct
    LHostName: array[0..3] of UTF8Char; is correct
    ...
    LHostName: array[0..199] of UTF8Char; is correct

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  2. Paul TOTHAugust 23, 2016 at 11:35 PM

    why not array[HostNameLength] like in C ?

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  3. Bill MeyerAugust 24, 2016 at 5:37 AM

    I find when I am creating a static array, most of the time, I will need symbolic reference to it throughout the code, so I declare an enumerated type. That type can then be used in the array declaration, in the same way Paul TOTH suggests above.

    I realize this doesn't cover all use cases, but for me, at least, it covers most.

    In the example given, though, I have in the past done this:

    const
      HostNameLength = 200;
      HostNameLimit = HostNameLength - 1;

      LHostName: array[0..HostNameLimit] of UTF8Char;

    Apart from reducing the amount of typing needed, especially with multiple arrays of that size, you have only one length constant to maintain, and the limit is handled by the compiler.

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  4. Lars FosdalAugust 24, 2016 at 6:46 AM

    or

    type
    HostNameRange = 0..HostNameLength-1;
    var
    LHostName: array [HostNameRange] of UTF8Char;

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  5. Lars FosdalAugust 24, 2016 at 6:48 AM

    But - considering an UTF8Char is potentially multi-char, is it correct to say that 200 characters is the appropriate size of the buffer?

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  6. Bill MeyerAugust 24, 2016 at 7:10 AM

    Lars Fosdal I usually go for the limit rather than the range, probably out of habit in later using it as a for loop limit. But the range is a reasonable solution, too. Since I am focused on Excel exports and ReportBuilder, I find myself using const arrays to manage columnar details, and the use of enums helps to make the coding comprehensible.

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  7. Horácio FilhoAugust 24, 2016 at 10:20 AM

    Lars Fosdal I would love to use a new syntax:
    Instead of having the minus operator, it would be possible to declare the range with upper bound exclusive, this code:
    HostNameRange = 0..HostNameLength-1;
    now, become this:
    HostNameRange = 0.
    UTF8Char is not multi-char, it is just used for interoperate with POSIX calls :D

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  8. Lars FosdalAugust 24, 2016 at 10:35 AM

    UTF8 is by definition multichar.

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  9. Bill MeyerAugust 24, 2016 at 10:40 AM

    Lars Fosdal Like some moderators. ;)

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  10. Lars FosdalAugust 24, 2016 at 10:43 AM

    Bill Meyer ?

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  11. Bill MeyerAugust 24, 2016 at 10:45 AM

    Lars Fosdal It was a joke, son, a joke. Because you are such a character. :)

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  12. Horácio FilhoAugust 24, 2016 at 11:16 AM

    Lars Fosdal I hope it will work hehehehe :D Using UTF8String to interoperate with POSIX calls looks to work nice but using UnicodeString doesn't.

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  13. Paul TOTHAugust 25, 2016 at 1:09 AM

    Horácio Filho it's seems that the "official" way is to use System.SysUtils.TMarshaller.AsUtf8

    ReplyDelete

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