How to output unicode string to RTF (using C#)

Question

I\'m trying to output unicode string into RTF format. (using c# and winforms)

From wikipedia:

If a Unicode escape is required, the control wor

Answer 1

Provided that all the characters that you're catering for exist in the Basic Multilingual Plane (it's unlikely that you'll need anything more), then a simple UTF-16 encoding should suffice.

Wikipedia:

All possible code points from U+0000 through U+10FFFF, except for the surrogate code points U+D800–U+DFFF (which are not characters), are uniquely mapped by UTF-16 regardless of the code point's current or future character assignment or use.

The following sample program illustrates doing something along the lines of what you want:

static void Main(string[] args)
{
    // ë
    char[] ca = Encoding.Unicode.GetChars(new byte[] { 0xeb, 0x00 });
    var sw = new StreamWriter(@"c:/helloworld.rtf");
    sw.WriteLine(@"{\rtf
{\fonttbl {\f0 Times New Roman;}}
\f0\fs60 H" + GetRtfUnicodeEscapedString(new String(ca)) + @"llo, World!
}"); 
    sw.Close();
}

static string GetRtfUnicodeEscapedString(string s)
{
    var sb = new StringBuilder();
    foreach (var c in s)
    {
        if (c <= 0x7f)
            sb.Append(c);
        else
            sb.Append("\\u" + Convert.ToUInt32(c) + "?");
    }
    return sb.ToString();
}

The important bit is the Convert.ToUInt32(c) which essentially returns the code point value for the character in question. The RTF escape for unicode requires a decimal unicode value. The System.Text.Encoding.Unicode encoding corresponds to UTF-16 as per the MSDN documentation.