[fpc-pascal] use cwstring or fpwidestring on linux

[ko paka]

When I used both managers, like in example, program doesnt work as
expected. Should I report it as error ? For now I will stay with cwstring
manager, but good to know that there is native implementation(first I need
to study something about unicode and collation though) . In fpc sources I
found fpwidestring used only in windows builds.

regards tomas

Example - linux i386, fpc 2.7.1 r25610

program fpwidestring_stringlist;

uses

// 3 possible combination of cwstring, fpwidestring
// 1) only cwstring - program works as expected and writes 4
// 2) only fpwidestring - error, because compareunicodestring function is
not implemented
// (current_Collation is nil in my case in
fpwidestrign.CompareUnicodeString)
// 3) both units - program writes -1 - which si really not expected


  cwstring,
  fpwidestring,
  classes;

var
  m: TStringList;
begin
  m := TStringList.Create;
  try
    m.Add('{E13ABA32-1328-4AFA-B21D-438AD054C0A5}');
    m.Add('{019D0AA0-915E-41CA-9145-05E6FC2D967C}');
    m.Add('{02591FA7-202B-4D63-BEC7-636B00BA1A8C}');
    m.Add('{23884961-80F8-4130-B60C-A5CF540A67C1}');
    m.Add('{3B3C9C24-0E23-44ED-8466-3024DF24011F}');
    m.Add('{398F240E-8809-4CE7-9175-983B96189526}');
    m.Add('{661979DB-C38D-4348-A617-59DD28D3327B}');
    m.Add('{87AC64E0-87FF-4CA5-B81C-AD494942703D}');
    Writeln('IndexOf {3B3C9C24-0E23-44ED-8466-3024DF24011F} is ',
m.IndexOf('{3B3C9C24-0E23-44ED-8466-3024DF24011F}'));
  finally
    m.Free;
  end;
end.



On Mon, Oct 7, 2013 at 9:27 AM, Michael Schnell <mschnell at lumino.de> wrote:

> On 10/04/2013 11:02 PM, Sven Barth wrote:
>
>>
>> If you want to share Unicode- or AnsiStrings between library and
>> application you need to use a common memory manager. For example you could
>> use unit "cmem" as one of the first units of both programs. It will work on
>> Unix based systems and *should* work on Windows ones as well.
>>
>
> BTW.:
>
> For my embedded C projects, I use different memory managers, dependent on
> the complexity of the project. Either a straight forward one, that just
> allocates blocks in a linked list or a more sophisticated one that uses
> different strategies for different block sizes (small: allocate equally
> sized blocks, medium: use a linked list within a preoccupied area, large:
> one area for each block.
>
> AFAIK the fpc RTL memory manager is similarly "sophisticated", no Idea
> what cmem does.
>
> I do know that for Delphi a third-party memory manager exists that works
> similar and on top oft hat allows for unifying the memory management of a
> program and the dlls called (which Delphi also does out of the box with
> dynamic packages).
>
> Can "cmem" (or some other fpc aware memory manager) also unify the memory
> management of a program and dlls (e.g. in order to allow for "plugins to
> fpc programs) ?
>
> -Michael
>
> ______________________________**_________________
> fpc-pascal maillist  -  fpc-pascal at lists.freepascal.**org<fpc-pascal at lists.freepascal.org>
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