C# 摩斯密码(Morse code)

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#C# #摩斯密码 #Morse code #电码

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本文介绍了一种摩尔斯电码转换器的实现方法，包括将文本信息转换为摩尔斯电码以及反向操作。该转换器支持基本的英文字母、数字及部分特殊字符。

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摩尔斯电码（又译为摩斯密码，Morse code）是一种时通时断的信号代码，通过不同的排列顺序来表达不同的英文字母、数字和标点符号。它由美国人艾尔菲德·维尔于1837年发明。摩尔斯电码是一种早期的数字化通信形式，但是它不同于现代只使用零和一两种状态的二进制代码，它的代码包括五种：点、划、点和划之间的停顿、每个字符间短的停顿（在点和划之间）、每个词之间中等的停顿以及句子之间长的停顿。

注意只可以使用英文/数字等ASCII编码127界限符中的内容并

不支持Unicode不过你可以自己修改一部分用于支持Unicode

示例代码：

public static class MorseCode // 摩尔斯电码(星际穿越)

{


    private static volatile string[,] CodeTable = 

    {

        {"A",".-"},

        {"B","-..."},

        {"C","-.-."},

        {"D","-.."},

        {"E","."},

        {"E","..-.."},

        {"F","..-."},

        {"G","--."},

        {"H","...."},

        {"I",".."},

        {"J",".---"},

        {"K","-.-"},

        {"L",".-.."},

        {"M","--"},

        {"N","-."},

        {"O","---"},

        {"P",".--."},

        {"Q","--.-"},

        {"R",".-."},

        {"S","..."},

        {"T","-"},

        {"U","..-"},

        {"V","...-"},

        {"W",".--"},

        {"X","-..-"},

        {"Y","-.--"},

        {"Z","--.."},

        {"0","-----"},

        {"1",".----"},

        {"2","..---"},

        {"3","...--"},

        {"4","....-"},

        {"5","....."},

        {"6","-...."},

        {"7","--..."},

        {"8","---.."},

        {"9","----."},

        {".",".-.-.-"},

        {",","--..--"},

        {":","---..."},

        {"?","..--.."},

        {"\'",".----."},

        {"-","-....-"},

        {"/","-..-."},

        {"(","-.--."},

        {")","-.--.-"},

        {"\"",".-..-."},

        {"=","-...-"},

        {"+",".-.-."},

        {"*","-..-"},

        {"@",".--.-."},

        {"{UNDERSTOOD}","...-."},

        {"{ERROR}","........"},

        {"{INVITATION TO TRANSMIT}","-.-"},

        {"{WAIT}",".-..."},

        {"{END OF WORK}","...-.-"},

        {"{STARTING SIGNAL}","-.-.-"},

        {" ","\u2423"}

    };




    public static string Enc(string str)

    {

        int i;

        string ret = string.Empty;

        if (str != null && (str = str.ToUpper()).Length > 0)

            foreach (char asc in str)

                if ((i = Find(asc.ToString(), 0)) > -1)

                    ret += " " + CodeTable[i, 1];

        return ret;

    }




    public static string Dec(string str)

    {

        int i;

        string[] splits;

        string ret = string.Empty;

        if (str != null && (splits = str.Split(' ')).Length > 0)

        {

            foreach (string split in splits)

                if ((i = Find(split, 1)) > -1)

                    ret += CodeTable[i, 0];

            return ret;

        }

        return "{#}";

    }




    private static int Find(string str, int cols)

    {

        int i = 0, len = CodeTable.Length / 2; // len / rank

        while (i < len)

        {

            if (CodeTable[i, cols] == str)

                return i;

            i++;

        };

        return -1;

    }

}

使用代码:

string encry = MorseCode.Enc("China"); // 把China换成摩尔斯电码
string decry = MorseCode.Dec(encry); //把encry换成明文形式