Encoding a string into utf-8 type

Question

How can I convert an Emoji in a string to an equivalent utf-8 code ? eg: "Hi this is Chinmay ! ☺ "

Aman Gupta · Answer

Hi chinmay, you can refer this public static string ConvertEmoji2UnicodeHex(string emoji){if (string.IsNullOrWhiteSpace(emoji))return emoji;byte[] bytes = Encoding.UTF8.GetBytes(emoji);string firstItem = Convert.ToString(bytes[0], 2); int iv;if (bytes.Length == 1){iv = Convert.ToInt32(firstItem, 2);}else{StringBuilder sbBinary = new StringBuilder();sbBinary.Append(firstItem.Substring(bytes.Length + 1).TrimStart('0'));for (int i = 1; i < bytes.Length; i++){string item = Convert.ToString(bytes[i], 2);item = item.Substring(2);sbBinary.Append(item);}iv = Convert.ToInt32(sbBinary.ToString(), 2);}return Convert.ToString(iv, 16).PadLeft(4, '0');}

Chinmay Joshi · Answer

Getting the below exception Unhandled Exception: System.ArgumentOutOfRangeException: startIndex cannot be larger than length of string. Parameter name: startIndex at System.String.Substring(Int32 startIndex, Int32 length) at ConsoleApp3.Program.ConvertEmoji2UnicodeHex(String emoji) in C:\Users\chinm\source\repos\ConsoleApp3\ConsoleApp3\Program.cs:line 25 at ConsoleApp3.Program.Main(String[] args) in C:\Users\chinm\source\repos\ConsoleApp3\ConsoleApp3\Program.cs:line 43

Chandresh Pansuriya · Answer

public static string ConvertEmoji2UnicodeHex( string emoji) { if ( string .IsNullOrWhiteSpace(emoji)) return emoji; byte [] bytes = Encoding.UTF8.GetBytes(emoji); string firstItem = Convert.ToString(bytes[0], 2); int iv; if (bytes.Length == 1) { iv = Convert.ToInt32(firstItem, 2); } else { StringBuilder sbBinary = new StringBuilder(); sbBinary.Append(firstItem.Substring(bytes.Length + 1).TrimStart( '0' )); for ( int i = 1; i { string item = Convert.ToString(bytes[i], 2); item = item.Substring(2); sbBinary.Append(item); } iv = Convert.ToInt32(sbBinary.ToString(), 2); } return Convert.ToString(iv, 16).PadLeft(4, '0' ); }

Laxmidhar Sahoo · Answer

Hi using System.Text; static void Main() { string unicodeString = "This string contains the unicode character Pi (\u03a0)" ; // Create two different encodings. Encoding ascii = Encoding.ASCII; Encoding unicode = Encoding.Unicode; // Convert the string into a byte array. byte [] unicodeBytes = unicode.GetBytes(unicodeString); // Perform the conversion from one encoding to the other. byte [] asciiBytes = Encoding.Convert(unicode, ascii, unicodeBytes); // Convert the new byte[] into a char[] and then into a string. char [] asciiChars = new char [ascii.GetCharCount(asciiBytes, 0, asciiBytes.Length)]; ascii.GetChars(asciiBytes, 0, asciiBytes.Length, asciiChars, 0); string asciiString = new string (asciiChars); // Display the strings created before and after the conversion. Console.WriteLine( "Original string: {0}" , unicodeString); Console.WriteLine( "Ascii converted string: {0}" , asciiString); } For more details https: //docs.microsoft.com/en-us/dotnet/api/system.text.encoding?view=netcore-3.1

Jignesh Kumar · Answer

Hi Chinmay, Please find below url which will help you, https://stackoverflow.com/questions/44728740/how-to-convert-emoticons-to-its-utf-32-escaped-unicode

Aman Gupta · Answer

Or You can use this public static string ConvertEmoji2UnicodeHex(string emoji){if (string.IsNullOrWhiteSpace(emoji))return emoji;byte[] bytes = Encoding.UTF8.GetBytes(emoji);string firstItem = Convert.ToString(bytes[0], 2); int iv;if (bytes.Length == 1){iv = Convert.ToInt32(firstItem, 2);}else{StringBuilder sbBinary = new StringBuilder();sbBinary.Append(firstItem.Substring(bytes.Length + 1).TrimStart('0'));for (int i = 1; i < bytes.Length; i++){string item = Convert.ToString(bytes[i], 2);item = item.Substring(2);sbBinary.Append(item);}iv = Convert.ToInt32(sbBinary.ToString(), 2);}return Convert.ToString(iv, 16).PadLeft(4, '0');}