Solved

How can I have this function from Delphi 5 working in Delphi 5

Posted on 2012-04-12
3
492 Views
Last Modified: 2012-04-13
Hello guys,

I don't have much knowledge to fix functions, I have some function from system.asp that comes from D7 and I need to make it work in D5.

This functions works with UTF8.

Could you give me a small project with all function working?

Thanks

// UnicodeToUTF8(3):
// Scans the source data to find the null terminator, up to MaxBytes
// Dest must have MaxBytes available in Dest.

function UnicodeToUtf8(Dest: PChar; Source: PWideChar; MaxBytes: Integer): Integer;
var
len: Cardinal;
begin
len := 0;
if Source <> nil then
while Source[len] <> #0 do
Inc(len);
Result := UnicodeToUtf8(Dest, MaxBytes, Source, len);
end;

// UnicodeToUtf8(4):
// MaxDestBytes includes the null terminator (last char in the buffer will be set to null)
// Function result includes the null terminator.
// Nulls in the source data are not considered terminators - SourceChars must be accurate

function UnicodeToUtf8(Dest: PChar; MaxDestBytes: Cardinal; Source: PWideChar; SourceChars: Cardinal): Cardinal;
var
i, count: Cardinal;
c: Cardinal;
begin
Result := 0;
if Source = nil then Exit;
count := 0;
i := 0;
if Dest <> nil then
begin
while (i < SourceChars) and (count < MaxDestBytes) do
begin
c := Cardinal(Source[i]);
Inc(i);
if c <= $7F then
begin
Dest[count] := Char(c);
Inc(count);
end
else if c > $7FF then
begin
if count + 3 > MaxDestBytes then
break;
Dest[count] := Char($E0 or (c shr 12));
Dest[count+1] := Char($80 or ((c shr 6) and $3F));
Dest[count+2] := Char($80 or (c and $3F));
Inc(count,3);
end
else // $7F < Source[i] <= $7FF
begin
if count + 2 > MaxDestBytes then
break;
Dest[count] := Char($C0 or (c shr 6));
Dest[count+1] := Char($80 or (c and $3F));
Inc(count,2);
end;
end;
if count >= MaxDestBytes then count := MaxDestBytes-1;
Dest[count] := #0;
end
else
begin
while i < SourceChars do
begin
c := Integer(Source[i]);
Inc(i);
if c > $7F then
begin
if c > $7FF then
Inc(count);
Inc(count);
end;
Inc(count);
end;
end;
Result := count+1; // convert zero based index to byte count
end;

function Utf8ToUnicode(Dest: PWideChar; Source: PChar; MaxChars: Integer): Integer;
var
len: Cardinal;
begin
len := 0;
if Source <> nil then
while Source[len] <> #0 do
Inc(len);
Result := Utf8ToUnicode(Dest, MaxChars, Source, len);
end;

function Utf8ToUnicode(Dest: PWideChar; MaxDestChars: Cardinal; Source: PChar; SourceBytes: Cardinal): Cardinal;
var
i, count: Cardinal;
c: Byte;
wc: Cardinal;
begin
if Source = nil then
begin
Result := 0;
Exit;
end;
Result := Cardinal(-1);
count := 0;
i := 0;
if Dest <> nil then
begin
while (i < SourceBytes) and (count < MaxDestChars) do
begin
wc := Cardinal(Source[i]);
Inc(i);
if (wc and $80) <> 0 then
begin
if i >= SourceBytes then Exit; // incomplete multibyte char
wc := wc and $3F;
if (wc and $20) <> 0 then
begin
c := Byte(Source[i]);
Inc(i);
if (c and $C0) <> $80 then Exit; // malformed trail byte or out of range char
if i >= SourceBytes then Exit; // incomplete multibyte char
wc := (wc shl 6) or (c and $3F);
end;
c := Byte(Source[i]);
Inc(i);
if (c and $C0) <> $80 then Exit; // malformed trail byte

Dest[count] := WideChar((wc shl 6) or (c and $3F));
end
else
Dest[count] := WideChar(wc);
Inc(count);
end;
if count >= MaxDestChars then count := MaxDestChars-1;
Dest[count] := #0;
end
else
begin
while (i < SourceBytes) do
begin
c := Byte(Source[i]);
Inc(i);
if (c and $80) <> 0 then
begin
if i >= SourceBytes then Exit; // incomplete multibyte char
c := c and $3F;
if (c and $20) <> 0 then
begin
c := Byte(Source[i]);
Inc(i);
if (c and $C0) <> $80 then Exit; // malformed trail byte or out of range char
if i >= SourceBytes then Exit; // incomplete multibyte char
end;
c := Byte(Source[i]);
Inc(i);
if (c and $C0) <> $80 then Exit; // malformed trail byte
end;
Inc(count);
end;
end;
Result := count+1;
end;

function Utf8Encode(const WS: WideString): UTF8String;
var
L: Integer;
Temp: UTF8String;
begin
Result := '';
if WS = '' then Exit;
SetLength(Temp, Length(WS) * 3); // SetLength includes space for null terminator

L := UnicodeToUtf8(PChar(Temp), Length(Temp)+1, PWideChar(WS), Length(WS));
if L > 0 then
SetLength(Temp, L-1)
else
Temp := '';
Result := Temp;
end;

function Utf8Decode(const S: UTF8String): WideString;
var
L: Integer;
Temp: WideString;
begin
Result := '';
if S = '' then Exit;
SetLength(Temp, Length(S));

L := Utf8ToUnicode(PWideChar(Temp), Length(Temp)+1, PChar(S), Length(S));
if L > 0 then
SetLength(Temp, L-1)
else
Temp := '';
Result := Temp;
end;

function AnsiToUtf8(const S: string): UTF8String;
begin
Result := Utf8Encode(S);
end;

function Utf8ToAnsi(const S: UTF8String): string;
begin
Result := Utf8Decode(S);
end;

Open in new window

0
Comment
Question by:hidrau
3 Comments
 
LVL 100

Accepted Solution

by:
mlmcc earned 250 total points
ID: 37840772
Here is a library that will help with the conversion.

Delphi 5 doesn't have unicode support except through WideChar

http://stackoverflow.com/questions/2856772/read-unicode-output-of-console-application

mlmcc
0
 
LVL 26

Assisted Solution

by:Sinisa Vuk
Sinisa Vuk earned 250 total points
ID: 37841410
0
 
LVL 1

Author Closing Comment

by:hidrau
ID: 37843393
thanks guys
0

Featured Post

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Machine not responding during CopyFile() 3 98
Syntax Check Delphi Seattle IOS app without MAC ? 1 98
Reconfigure Delphi Install? 2 51
Delphi and Access based Enumeration 9 64
Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
Have you ever had your Delphi form/application just hanging while waiting for data to load? This is the article to read if you want to learn some things about adding threads for data loading in the background. First, I'll setup a general applica…
This tutorial gives a high-level tour of the interface of Marketo (a marketing automation tool to help businesses track and engage prospective customers and drive them to purchase). You will see the main areas including Marketing Activities, Design …
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…

803 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question