Greek letter display issue

Question

I wanted to display greek letter lambda in a richtextbox (winforms 4.5.2).

My RTF will look as below:

richTextBox1.Rtf = "{\\rtf1\\ansi\\deff0{\\fonttbl{\\f0\\fswiss\\fcharset0 Arial;}}\\uc1\\pard\\f0\\fs24 pdioxaborolan-2-yl)phenyl]-λ⁶-sulfane}";

but it always display λ⁶ as two ?? (question marks)

I also tried putting \u03BB instead of the Greek symbol directly, didn't made any change in output.

Please help to display the greek letter.

If I assign the text directly then it works.

richTextBox1.Text = "pdioxaborolan-2-yl)phenyl]-λ⁶-sulfane";

(In this case lambda display as Greek letter but superscript shows as box)

Thank you...

Your `richTextBox1.Text = "..."` example works for me for both chars, ensure the font your using actually has superscript characters. You can always *roundtrip* - set the correct value manually (or paste) then dump `richTextBox1.Rtf` to see what the actual markup format is. — Alex K., Jul 24 '18 at 14:31
You need to use `RICHEDIT50W`. Take a look at [this post](https://stackoverflow.com/a/47437868/3110834). You can find an example [here](https://stackoverflow.com/a/32618479/3110834). — Reza Aghaei, Jul 24 '18 at 16:29

score 0 · Accepted Answer · answered Jul 24 '18 at 17:32

The short answer is that the RTF you show does not support the characters, my guess is the font.

As a test I added some text to a richtextbox(RTB). The font of the RTB does not support those characters. With this code I was able to add your text correctly to the end of the RTB

    RichTextBox1.SelectionStart = RichTextBox1.TextLength - 1
    RichTextBox1.SelectionLength = 0

    RichTextBox1.SelectedRtf = "{\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fnil\fcharset0 Times New Roman;}{\f1\fnil\fcharset161{\*\fname Times New Roman;}Times New Roman Greek;}}\uc1\pard\f0\fs24 pdioxaborolan-2-yl)phenyl]-\f1\'eb\f0\u8310?-sulfane}"

The results

sd              486
sdivs             1
------------
Total           531

Other           540  e.g. text, comment

pdioxaborolan-2-yl)phenyl]-λ⁶-sulfane

Thanks dbasnett. My actual requirement was to dynamically form the RTF and show the content because the text will get changed based on the input. Now as quick workaround what I am doing is creating a temporary richtextbox and assign the Text and then take out the RTF from the tempRichTextBox. I need to create RTF for some other save purposes. — user3616017, Jul 25 '18 at 10:03

Greek letter display issue

1 Answers1