The unicodepoint2utf16() function takes in as parameters a Unicode code point string and a ref string that will be modified to hold the resulting UTF-16 encoding. we have taken care of the entered // do not futher process it Textbox.SelectionStart = textbox.SelectionStart - (n - n1) (s3) // (n-n1) is the number of chars that we want to replace // it is the length of the U+# or U+# // we select these chars to be replaced // by s3 (the Unicode character that we generated) generate the character from the byte array // Note that if we send in a surrogate pair encoding of 4 bytes // we would get a double char character // a double char character is render as one glyph // but has a length of 2, // if s3 holds a double char character, s3.Length is 2 string s3 = u.GetString(bytes) UnicodeEncoding u = new UnicodeEncoding() high order code unit is 0000 // we only need use the low order code unitĮlse // high order code unit 0000 // this is a surrogate pair encoding // we need 2 code units // b1, b0 for high order code unit // b3, b3 for low order code unit b0 is the highest order byte and // b3 is the lowest order byte // a code unit is 4 hex digits, ie 2 bytes // b0,b1 is the high order code unit // b2,b3 is the low order code unit // Note that Windows uses Little Endian // for the byte ordering for char // so to encode the code unit (each a char of 2 bytes) // we have to put the lower order byte to the left // the encoding for the code units would be as follows // high order code unit: b1,b0 // low order code unit: b3,b2 if (b0 = 0 & b1 = 0) Uint maskb3 = Convert.ToUInt32( " FF", 16) Uint maskb2 = Convert.ToUInt32( " FF00", 16) if we have a valid utf16 encoding // we get actual character from the utf16 string representation if (s2 != " ") (s1) // we attempt to encode s1 in utf16 encoding string s2 = " " get the chars after the "U+" header // s1 are the following chars up till the cursor position // s1 could valid unicode code point string s1 = s.Substring(n1 + 2, s.Length - (n1 + 2)) n is number of chars preceeding the cursor position // that we want to analysze // U+# is 6 chars and U+# is 7 chars // if possible we will analyze 7 chars // Otherwise if cursor position is = 0) If (e.Ke圜har = ' ' & textbox.SelectionStart >= 6) (textbox.Text + " " + e.Ke圜har) string s = " " You can access the tool via Start->All Programs-> Accessories->System Tools-> Character Map.Ĭopy Code private void HandleKeyPress( object sender, KeyPressEventArgs e) In Windows 7, you can install new IME via the Control Panel -> Region and Language -> Keyboard and Language.Ī generic tool provided by Microsoft that can generate all Unicode code point for the Basic Multilingual Plane and you can copy and paste into a Unicode supporting text input interface. For some interesting font files, you may want to visit this site: Unicode Fonts for Ancient ScriptsĪ language specific tool used to efficiently create Unicode code point to be entered into a Unicode supporting text input interface. Each glyph in the font file is tagged to a Unicode code point. These are collection of glyphs that are normally grouped together based on language or usage. Note that for the same Unicode code point, for language like Arabic, the glyph used is different depending on the neighbouring characters. These are graphics used to render the character representing the Unicode code point in a display. UTF8 is an encoding standard that uses 1 or more bytes to encode each Unicode code point. See Surrogate Support in Microsoft Products for more details on how to do the encoding. For encoding Unicode code points outside of the Basic Multilingual Plane, 2 sets of 4 hexadecimal numbers are used. The encoding for U+222B is hexadecimal 22 2B if the byte ordering is Big endian and hexadecimal 2B 22 if the ordering is Little endian. UTF16 are mostly double byte encoding (except for surrogate pairs). For example the ancient Egyptian Hieroglyphs are from U+F3000 - U+F4B92.Īll Unicode code points can be encoded in either of the 2 standard encoding formats: UTF16 and UTF8. Other Multilingual Plane can have code points with 5 hexadecimal digits. For example the U+222B is the code point for the Mathematical symbol for Integration "∫". For code points in the Basic Multilingual Plane (BMP), four digits are used. A Unicode code point is referred to by writing "U+" followed by its hexadecimal number.
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