[DUG] Strings Question

[Jeremy Coulter]

You are right about the MD5 stuff.
I have 2 different methods, one is the THash which is in System.Hash and
one that part of teh OverByte ICS code.
They both return 2 diff. hash's !! agh...

On Wed, Nov 16, 2016 at 11:06 AM, Jolyon Direnko-Smith <jsmith at deltics.co.nz
> wrote:

> Just one correction:
>
> Array of Char = Array of AnsiChar
>
> One other thing to watch out for is if you have methods which accept
> strings as untyped buffers.  Passing a "String" to these methods will not
> convert them to ANSIString, so the method receives a buffer of WIDEChars.
> Also watch out for TStringStreams and any assumptions about the encoding of
> the string in that case.
>
> Ultimately a lot will depend on the API for whatever MD5 library you are
> employing and how you pass strings into that API.  MD5 works on bytes, not
> chars so it won't necessarily be trying to take account of "sane"
> conversions between string types (again, depending on the library you are
> using).
>
>
> On 16 November 2016 at 10:00, Jeremy Coulter <jscoulter at gmail.com> wrote:
>
>> HI all.
>> I have a Delphi 2007 application that I NEED to upgrade to Delphi XE 8 or
>> greater.
>> The problem is, I am having trouble converting the code due to the fact
>> that Embarcadero changed how "String" etc. is used when they added the
>> support for Unicode.
>> I have had a couple of cracks at the conversion and I am "close" on one
>> project but I am starting again because I want to make sure I am using the
>> right variable types and not guessing.
>> There is a bit of MD5 conversion going on and the different variable
>> types of course generated diff MD5 codes for the same string being
>> converted and it is a bit confusing :-)
>>
>> The main variable types are:
>>
>> String
>> Byte
>> Integer
>> LongInt
>> Pointer
>> Array of Char
>> PChar
>> Char
>>
>> My understanding is the variables should now be :-
>>
>> String = AnsiString?
>> Byte = Still Byte?
>> Integer = Still Integer
>> LongInt =Still LongInt
>> Pointer = Still Pointer
>> Array of Char = PAnsiCHAR ?
>> PChar = PAnsiChar?
>> Char = AnsiChar?
>>
>> Am I correct with the above that I have highlighted in "Red" ??
>>
>> Thanks, Jeremy
>>
>>
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>
>
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