Question

How to encode strings in url format -encodeURI() equivalent

Asked by: ohadnet

How to convert strings in delphi from UTF8 or other charsets to the URL standard
iso-8859-1

In JavaScript you can use the encodeURI() function. PHP has the rawurlencode() function and ASP has the Server.URLEncode() function.
what is the equivalent in delphi?

URL encoding replaces unsafe ASCII characters with "%" followed by two hexadecimal digits corresponding to the character values in the ISO-8859-1 character-set.
How to do it in delphi?

There is an online example here:
http://www.w3schools.com/TAGS/ref_urlencode.asp

But I need it from within Delphi 7.

Any Ideas?

THanks

Ohad

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Asked On: 2009-11-04 at 03:29:58ID24870513
Tags: delphi url encode iso 8955 utf8 convert encodeurl() rawurlencode() urlencode()
Topics: Delphi Programming
,; Internet and Delphi Programming
,; Delphi IDE
Participating Experts: 1
Points: 500
Comments: 5

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Answers

by: MvanderKooijPosted on 2009-11-04 at 04:51:17ID: 25738752

For Delphi 2007 there is a function HTTPEncode in the HTTPApp.pas unit that uses the RFC 1738 guideline to do this

by: MvanderKooijPosted on 2009-11-04 at 04:53:21ID: 25738767

Same function on Torry:

http://www.swissdelphicenter.ch/torry/showcode.php?id=773

by: ohadnetPosted on 2009-11-04 at 05:35:21ID: 25739085

Thanks MvanoderKooij -
but the Httpencode function on Torry results in some variant which is not identical to the output of URL encoding in ISO-8859-1 format.

If there is no direct solution,
is there a way to embed the javascript function in delphi?

Ohad

by: MvanderKooijPosted on 2009-11-04 at 05:44:05ID: 25739172

Well the functions is rather easy to change for you're needs and that is a lot easier than using java in a delphi application :-)

For instance if you do not want the space to be replaced by an + use the attached code.

If there are other things you miss don't like, change the code or tell what is wrong.

function HTTPEncode(const AStr: string): string;
const
  NoConversion = ['A'..'Z', 'a'..'z', '*', '@', '.', '_', '-'];
var
  Sp, Rp: PChar;
begin
  SetLength(Result, Length(AStr) * 3);
  Sp := PChar(AStr);
  Rp := PChar(Result);
  while Sp^ <> #0 do
  begin
    if Sp^ in NoConversion then
      Rp^ := Sp^
    else if Sp^ = ' ' then
      Rp^ := '+'
    else
    begin
      FormatBuf(Rp^, 3, '%%%.2x', 6, [Ord(Sp^)]);
      Inc(Rp, 2);
    end;
    Inc(Rp);
    Inc(Sp);
  end;
  SetLength(Result, Rp - PChar(Result));
end;

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by: MvanderKooijPosted on 2009-11-04 at 05:49:04ID: 25739228

oops wrong version in the clipboard....

in this version the spaces are no longer translated to a + but as %20, numbers and some other characters are also not translated. I use this version for creating URL's for a HTTP component get command.

function HTTPEncode(const AStr: string): string;
const
  NoConversion = ['A'..'Z', 'a'..'z', '*', '@', '.', '_', '-',
                  '0'..'9', '$', '!', '''', '(', ')', '/'];
var
  Sp, Rp: PChar;
begin
  SetLength(Result, Length(AStr) * 3);
  Sp := PChar(AStr);
  Rp := PChar(Result);
  while Sp^ <> #0 do
  begin
    if Sp^ in NoConversion then
      Rp^ := Sp^
    else
    begin
      FormatBuf(Rp^, 3, '%%%.2x', 6, [Ord(Sp^)]);
      Inc(Rp, 2);
    end;
    Inc(Rp);
    Inc(Sp);
  end;
  SetLength(Result, Rp - PChar(Result));
end;

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Question

How to encode strings in url format -encodeURI() equivalent

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delphi url encode iso 8955 utf8 convert encodeurl() rawurlencode() urlencode()

Delphi Programming

Internet and Delphi Programming

Delphi IDE

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