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Hi,

recently I am having some problems with a RichTextBox displaying Unicode characters, especially arabic, when the font used is Verdana.
However, displaying the same content on a Label or TextBox shows good and correct results. Also when using Microsoft Sans Serif instead of Verdana.

Is anyone having an idea how to solve? You can take the following as an example input for the Text property of either control:

b, t, th, dsch, h´, ch, d, th, r, z, ß, sh, s, d, t, th, a, r, f, q, k, l, m, n, h, w(u), y(i)
ﺃ, ﺐ, ﺕ, ﺚ, ﺝ, ﺡ, ﺥ, ﺪ, ﺫ, ﺭ, ﺯ, ﺱ, ﺵ, ﺹ , ﺽ, ﻁ , ﻅ, ﻉ, ﻍ, ﻑ, ﻕ, ﻙ, ﻝ, ﻡ, ﻥ, ﻩ, ﻭ, ﻱ


On a RichTextBox using Verdana the arabic characters will be displayed as squares. You can also try the following code:

C#
using System.Windows.Forms;
namespace RichTextBoxDoesNotUnderstandArabic
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            string unicodeText = "a, b, t, th, dsch, h´, ch, d, th, r, z, ß, sh, s, d, t, th, a, r, f, q, k, l, m, n, h, w(u), y(i) ﺃ, ﺐ, ﺕ, ﺚ, ﺝ, ﺡ, ﺥ, ﺪ, ﺫ, ﺭ, ﺯ, ﺱ, ﺵ, ﺹ , ﺽ, ﻁ , ﻅ, ﻉ, ﻍ, ﻑ, ﻕ, ﻙ, ﻝ, ﻡ, ﻥ, ﻩ, ﻭ, ﻱ";
            this.SuspendLayout();
            //
            // richTextBox1
            //
            this.richTextBox1 = new System.Windows.Forms.RichTextBox();
            this.richTextBox1.BorderStyle = System.Windows.Forms.BorderStyle.None;
            this.richTextBox1.Font = new System.Drawing.Font("Verdana", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte) (0)));
            this.richTextBox1.Location = new System.Drawing.Point(25, 80);
            this.richTextBox1.Name = "richTextBox1";
            this.richTextBox1.Size = new System.Drawing.Size(260, 103);
            this.richTextBox1.TabIndex = 0;
            this.richTextBox1.Text = unicodeText;
            //
            // label1
            //
            this.label1 = new System.Windows.Forms.Label();
            this.label1.BackColor = System.Drawing.Color.White;
            this.label1.Font = new System.Drawing.Font("Verdana", 8.25F);
            this.label1.Location = new System.Drawing.Point(309, 80);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(260, 103);
            this.label1.TabIndex = 1;
            this.label1.Text = unicodeText;
            //
            // textBox1
            //
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.textBox1.Font = new System.Drawing.Font("Verdana", 8.25F);
            this.textBox1.Location = new System.Drawing.Point(591, 80);
            this.textBox1.Multiline = true;
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(260, 103);
            this.textBox1.TabIndex = 2;
            this.textBox1.Text = unicodeText;
            //
            // Form1
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(883, 222);
            this.Controls.Add(this.label4);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.textBox1);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.richTextBox1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);
            this.PerformLayout();
        }
    }
}


Best regards,
Michael
Posted

Sound like the font doesn't not include the required characters. Not all fonts support all unicode code points.

Regards
Espen Harlinn
 
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Comments
Sergey Alexandrovich Kryukov 21-Jan-11 14:48pm    
As easy as that -- I checked up.
5.
--SA
can done in VB.NET
VB
RichTextBox1.Text = (System.Text.RegularExpressions.Regex.Replace(str, "(\d{3,}?);", New System.Text.RegularExpressions.MatchEvaluator(AddressOf ConvertCode)))


Just Convert this in C or C# by this site

Convert Code Site

Enjoy
 
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Comments
Thomas Daniels 13-Nov-12 12:45pm    
Why you don't post the converted code, instead of posting VB.NET code and telling the OP that he need to convert it?

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