Solved

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

Posted on 2012-04-12
3
518 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
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 101

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 27

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

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

A lot of questions regard threads in Delphi.   One of the more specific questions is how to show progress of the thread.   Updating a progressbar from inside a thread is a mistake. A solution to this would be to send a synchronized message to the…
Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
In this video, viewers are given an introduction to using the Windows 10 Snipping Tool, how to quickly locate it when it's needed and also how make it always available with a single click of a mouse button, by pinning it to the Desktop Task Bar. Int…
Michael from AdRem Software outlines event notifications and Automatic Corrective Actions in network monitoring. Automatic Corrective Actions are scripts, which can automatically run upon discovery of a certain undesirable condition in your network.…

726 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