[Lazarus] UTF8 string handling problem under linux

[Mattias Gaertner]

On Sun, 11 Aug 2013 11:17:16 +0800
Xiangrong Fang <xrfang at gmail.com> wrote:

> Hi All,
> 
> I have the following program:
> 
> ===============================================================
> procedure TForm1.Button1Click(Sender: TObject);
> begin
>   if sd.Execute then begin
>     if r.OpenKey('test_utf8', True) then begin
> //      r.WriteString('path', UTF8ToSys(sd.FileName));
>       r.WriteString('path', sd.FileName);
>       r.CloseKey;
>     end;
>   end;
> end;
> 
> procedure TForm1.Button2Click(Sender: TObject);
> begin
>   if r.OpenKey('test_utf8', False) then begin
> //    ShowMessage('path=' + SysToUTF8(r.ReadString('path')));
>     ShowMessage('path=' + r.ReadString('path'));
>     r.CloseKey;
>   end;
> end;
> ============================================================
> 
> It runs OK under windows whether I use SysToUTF8 or not, but on Linux, it
> crashes (SIGSEGV) on the line with r.ReadString.

Please provide a backtrace.
What is r?
What compiler version?

> I wonder what is the correct way to write a program that compile and run
> well under both Windows and Linux?

Usually Linux already has UTF8, so SysToUTF8 does no conversion.


Mattias