On Mon, Feb 19, 2018 at 04:17:26PM +0100, Bernhard Kleine wrote:
> The UTF8 table at
> http://www.utf8-zeichentabelle.de/unicode-utf8-table.pl?start=8592 shows
> this first four lines.
> 
> Unicode
> Codepos.      Zeichen         UTF-8
> (hex.)        Name
> U+2190        ←       e2 86 90        LEFTWARDS ARROW
> U+2191        ↑       e2 86 91        UPWARDS ARROW
> U+2192        →       e2 86 92        RIGHTWARDS ARROW
> U+2193        ↓       e2 86 93        DOWNWARDS ARROW
> 
> When I tried to change a utf8 hex value in a simple doc, using
> Ctrl-Shift-X, I get:
> 
> (not a valid hexadecimal sequence to change)
> 
> I also tried the 0x1F926 from Bens example below. The same error. What
> do I wrong?

The face palm character probably isn't a good thing for you to test
with since it's technically an emoji and is from one of the upper
planes (it's near the end of the second plane out of 17).  Your
characters are all in the first plane and, prior to the popularisation
of emojis, that's where all the action usually is.

> These arrows would be a good example since they will be used.

Use the four character hexadecimal value of the code point without
either a leading "U+" or a leading "0x" if you are doing this in
oXygen, but it does need to be four characters, there must be a space
before it and the cursor needs to be immediately adjacent to the end
of it.

So for the leftwards arrow you would enter 2190 and then, with the
cursor next to the 0 (as it would be if you'd just typed it), press
the key sequence to convert to UTF-8 and it'll do it.

getting unum.pl to display it would be:

bash-4.4$ unum.pl 0x2190
   Octal  Decimal      Hex        HTML    Character   Unicode
  020620     8592   0x2190 
←,←,←,←,←    "←"         
LEFTWARDS ARROW
bash-4.4$

Note that that's offset too far because there are multiple methods of
displaying it in HTML (which is why tests with arrows aren't always
the best after all, but you did want this).

LibreOffice uses either a compose special characters hotkey or menu
with options on what the hotkey actually dows.  I have it configured
to let me enter the hexadecimal directly.  It will provide the same
range of characters as oXygenXML except I press the hotkey first and
then enter the four characters.  As with oXygen I must enter all four
characters.

Most other programs are the same as LibreOffice in that regard,
including the IRC client hexchat.

Emacs shares some similarity with those programs in that I invoke the
conversion function first and then enter the hexadecimal character
without the leading "0x" or "U+" but I only have to enter the hex
value and I can enter from one to six characters.  So if I wanted to
create a u with an umlaut (i.e. this little character: ü) then I only
need to press my key binding (F8) and then enter fc; whereas in
oXygenXML, LibreOffice, Hexchat and most other programs I would have
needed to enter 00fc.

This sort of thing, however, is why I started keeping a cheat sheet in
the first place.


Regards,
Ben

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