Delphi XE broken UTF8
Hi, I am using the Rad Studio XE trial edition to see how hard an upgrade of our project will be.
Getting to compile and link was pretty easy.
However, the UnicodeToUtf8 function appears to be badly broken making our app unusable. Please can someone with the full release confirm this and maybe go into the System source file (not available in trial version) to analyse?
It is easily reproducable (and this code works fine on D2010). The function appears to be not null terminating (as the help promises it will):
{code}
function UTF8Str(const WS: string): AnsiString;
var
szTitle: array[0..511] of AnsiChar;
begin
szTitle[0] := #0;
szTitle[3] := #1;
UnicodeToUtf8(szTitle, 511, PChar(WS), Length(WS));
Result := szTitle;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
ShowMessage(UTF8Str('Man'));
end;
{code}
NOTE: I don't normally have the #1 line but this highlights the memory is just left with possible junk in at this location.
I can rewrite my UTF8Str to null terminate explicitly but I am worried about other breakages...
Cheers
Dave
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Dave
9/1/2010 10:35:34 AM
embarcadero.delphi.general
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Am 01.09.2010 12:35, schrieb Dave Speight: > Please can someone with the full release confirm this and maybe go into the System source file (not available in trial version) to analyse? The procedure UnicodeToUtf8 has been modified in XE to prepare for cross-platform. Seems like the null terminator check has fallen through. You should file a QC for this. Uwe Raabe -- Uwe's Blog: The Art of Delphi Programming <http://www.uweraabe.de/>
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Uwe
9/1/2010 11:01:46 AM
Dave Speight wrote: > Please can someone with the full release confirm this and maybe go > into the System source file (not available in trial version) to > analyse? See for the "why" Uwe's reply. Workarounds: use UnicodeToUtf8(szTitle, 511, PChar(WS), Cardinal(-1)); or Result := UTF8Encode(WS). -- Pieter "If it weren't for electricity we'd all be watching television by candlelight." -- George Gobel.
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Pieter
9/1/2010 12:25:49 PM
> {quote:title=Uwe Raabe wrote:}{quote}
> The procedure UnicodeToUtf8 has been modified in XE to prepare for
> cross-platform. Seems like the null terminator check has fallen through.
> You should file a QC for this.
That's why I've implemented our own versions of UTF-8/Unicode/AnsiString conversion in our framework. Faster, and compatible with Delphi 7 up to Delphi 2010 (didn't test with XE, but should pass).
I've already learnt not to depend on the Delphi RTL about string encoding. It's mandatory for having Open Source libraries working with multiple version of the Delphi compiler.
It's a pity that such regression occurs, in low-level part of the Delphi RTL.
Is there any other info about VCL / RTL enhancement, especially to prepare cross-platform? NativeUInt exists till Delphi 2007, but what about the Tag property of the TComponent (will it become NativeInt?), and so on...
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Arnaud
9/1/2010 12:44:11 PM
Am 01.09.2010 14:44, schrieb Arnaud BOUCHEZ: > (will it become NativeInt?) I hope it's assured that the Tag property will be large enough to hold pointers on 64 bit machines... Christian
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Christian
9/1/2010 12:50:43 PM
Thanks for the information. I have raised QC 87709
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Dave
9/1/2010 1:22:49 PM
Thanks for the suggestions > UnicodeToUtf8(szTitle, 511, PChar(WS), Cardinal(-1)); appears to effectively call the deprecated version of this function... > Result := UTF8Encode(WS). This returns a RawByteString and I don't think this works with my database requirements for AnsiStrings (at least not without me worrying about any side effects) I have gone with a FillChar(szTitle, 512, 0); before the conversion until the bug is fixed
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Dave
9/1/2010 1:25:42 PM
Dave Speight wrote: > Thanks for the suggestions > > > UnicodeToUtf8(szTitle, 511, PChar(WS), Cardinal(-1)); > > appears to effectively call the deprecated version of this function... No it is the same function the -1 tells the used WideCharToMultiByte function to add the terminating null character to the output string. (and yes the deprecated function happens to do the same :) ) > I have gone with a FillChar(szTitle, 512, 0); before the conversion > until the bug is fixed That will work too :) -- Pieter "The police are not here to create disorder. They're here to preserve disorder." -- Ex-Chicago Mayor Daley during the 1968 riots
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Pieter
9/1/2010 2:02:44 PM
<Dave Speight> wrote in message news:280985@forums.embarcadero.com...
> However, the UnicodeToUtf8 function appears to be badly
> broken making our app unusable.
The return value of UnicodeToUtf8() indicates the number of output
characters. In D2010, that includes a null terminator. In XE, it does not.
You should use the return value (even in D2010) instead of relying on the
output buffer actually being null-terminated (the RTL's own code always
looks the return value in both versions), eg:
{code:delphi}
function UTF8Str(const WS: string): AnsiString;
var
szTitle: array[0..511] of AnsiChar;
iLen: Cardinal;
begin
szTitle[0] := #0;
szTitle[3] := #1;
iLen := UnicodeToUtf8(szTitle, 511, PChar(WS), Length(WS));
if (iLen > 0) and (szTitle[iLen-1] = #0) then Dec(iLen);
SetString(Result, szTitle, iLen);
end;
{code}
A better option is to use the overloaded version of Utf8Encode() that takes
a UnicodeString as input and returns a RawByteString as output, and then
copy that into your AnsiString. Not only does that allow the RTL to encode
the output correctly for that version's unique encoding semantics, but it
also allows you to handle larger strings as well, eg:
{code:delphi}
function UTF8Str(const WS: string): AnsiString;
var
szTitle: RawByteString;
begin
szTitle := Utf8Encode(WS);
SetString(Result, PAnsiChar(szTitle), Length(szTitle));
end;
{code}
A better option is to not encode the data manually at all (at least in D2009
and later, anyway). Assign the UnicodeString directly to a UTF8String
variable and let the RTL decide how to encode it for you, eg:
{code:delphi}
function UTF8Str(const WS: string): AnsiString;
var
szTitle: UTF8String;
begin
szTitle := UTF8String(WS);
SetString(Result, PAnsiChar(szTitle), Length(szTitle));
end;
{code}
--
Remy Lebeau (TeamB)
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Remy
9/1/2010 7:10:21 PM
Thanks for the detailed and helpful information, one day I will hopefully get a full understanding of all the encoding options.
> {code:delphi}
> szTitle := UTF8String(WS);
> {code}
I will go for this option as it seems the neatest. I remember trying all sorts of similar combinations of local variable types and encoding function calls to get code to put correctly encoded UTF8 in my database but I never thought to try the mysterious SetString function.
I assume you still agree there is an error in UnicodeToUtf8 as the doc promises it will provide a null-terminated sequence of UTF-8 characters. If so I will leave the QC entry.
Thanks,
Dave
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Dave
9/2/2010 9:09:04 AM
<Dave Speight> wrote in message news:281598@forums.embarcadero.com...
>> {code:delphi}
>> szTitle := UTF8String(WS);
>> {code}
>
> I will go for this option as it seems the neatest.
Just remember that UTF8String did not become true UTF-8 string until D2009.
In earlier versions, UTF8String was just a typedef of AnsiString, so
assigning a String to a UTF8String (or vice versa) was a reference-counted
assignment and not an actual Ansi<->UTF8 conversation like it is in D2009+,
so you will have to use UTF8Encode() (and UTF8Decode()) in pre-2009
versions.
> I assume you still agree there is an error in UnicodeToUtf8 as the doc
> promises
> it will provide a null-terminated sequence of UTF-8 characters. If so I
> will leave
> the QC entry.
Since it is a good chunk of code that got removed, I assume it was
intentional and they just forgot to update the comments. This is why it is
not a good idea to call system functions directly, as they are subject to
change from version to version. They are primarily meant for supporting the
compiler/RTL, not the user. Use higher-level coding (like using the
UTF8String data type) and let the compiler/RTL decide how to use the
lower-level system functions as needed.
--
Remy Lebeau (TeamB)
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Remy
9/2/2010 5:32:38 PM
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