How to convert a string or character to its unicode representation and back?

Question

I'm in the process of learning more about Unicode. Could someone please demonstrate how to translate a code point value to a character string and vice-versa.

For example: How do you convert U+0037 to its character or string representation which is 7.

Please also show how to do this for ascii. For example: convert   to its character or string representation which is a space.

It's easy enough to parse the string and then use chr() to get a character. That will be fine for code points in the BMP. HTML entities are something else altogether. — David Heffernan
– David Heffernan, Commented Aug 5, 2014 at 7:07
David is it as simple as s:=chr(' ') or maybe s:=chr('U+0037');? — megatr0n
– megatr0n, Commented Aug 5, 2014 at 7:13
First of all you have to read the docs of chr(). Then parse the code point ordianl out of 'U+0037'. And html entities are completely different. Get a database of those. — David Heffernan
– David Heffernan, Commented Aug 5, 2014 at 7:20
Yeah had feeling I was gonna need some database but I thought delphi would come with one. Well I guess I will have to search for a Unicode Table online and parse it. — megatr0n
– megatr0n, Commented Aug 5, 2014 at 7:28

kludg · Accepted Answer · 2014-08-05 08:00:05Z

6

Delphi strings already use Unicode (UTF16) encoding, so there is no need to "convert" delphi strings to Unicode. Here is an example how to insert a Unicode representation of nbsp (U+00A0) and '7' (U+0037') into a delphi string directly:

procedure TForm1.Button1Click(Sender: TObject); const U_nbsp = $00A0; U_7 = $0037; var S: string; begin S:= 'abcd' + Char(U_nbsp) + Char(U_7); ShowMessage(S); end;

answered Aug 5, 2014 at 8:00

kludg

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9 Comments

megatr0n Over a year ago

Sir, I see the use of const, but what if you don't know the item you are going to decode?

kludg Over a year ago

@megatr0n replace const by var?

mg30rg Over a year ago

@megatr0n If you have the Unicode jump code in U+0000 format, you can parse it for the hex digits then use the StrToInt() function to convert it to an integer.

mg30rg Over a year ago

@megatron However it does not solve the   related problem, because it is not a Unicode jumpcode representation.

Rudy Velthuis Over a year ago

@DavidHeffernan: Chr is, in effect, a cast. It does not produce any code (except the usual Byte to Word expansion, which the cast would produce too), AFAICT.

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David Buck · Accepted Answer · 2020-08-01 09:52:09Z

procedure TFrm.FormCreate(Sender: TObject); begin TabEmoj.Text:=#$1F604; KeyEmojisActivator.Text:=#$1F604; Attachbutton.Text:=#$1F4CE; VideoAudiobutton.Text:=#$1F3A5; /// MIC = #$1F3A4; EnterButton.Text:=#$21A9; end; // use this. Download example on u9.by

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