Silverlight 到 Javascript 互操作 UTF 编码/解码

Question

如何获取两个警报，一个从 silverlight 调用，另一个从 javascript 调用，以相同的方式显示相同的数据。

例如。 ���� != ýÿýÿý

System.Windows.Browser.HtmlPage.Window.Alert(数据);

警报（参数）；

Silverlight3 代码，向 javascript 函数发送数据：

         System.Windows.Browser.HtmlPage.Window.Alert( data );
         // data contains binary data read from files

         data = Convert.ToBase64String(Encoding.UTF8.GetBytes(data));


        HtmlPage.Window.Eval("var data='"+data+"'makePOSTRequest('"+this.url+"',data);");

javascript函数：

      function makePOSTRequest(url,parameters)
      {
      ...
        parameters = UTF8.encode(decode64(parameters));

        alert(parameters);
      ...
     }

javascript 库：

    var UTF8 = {

        // public method for url encoding
        encode: function(string) {
            string = string.replace(/\r\n/g, "\n");
            var utftext = "";

            for (var n = 0; n < string.length; n++) {

                var c = string.charCodeAt(n);

                if (c < 128) {
                    utftext += String.fromCharCode(c);
                }
                else if ((c > 127) && (c < 2048)) {
                    utftext += String.fromCharCode((c >> 6) | 192);
                    utftext += String.fromCharCode((c & 63) | 128);
                }
                else {
                    utftext += String.fromCharCode((c >> 12) | 224);
                    utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                    utftext += String.fromCharCode((c & 63) | 128);
                }

            }

            return utftext;
        },

        // public method for url decoding
        decode: function(utftext) {
            var string = "";
            var i = 0;
            var c = c1 = c2 = 0;

            while (i < utftext.length) {

                c = utftext.charCodeAt(i);

                if (c < 128) {
                    string += String.fromCharCode(c);
                    i++;
                }
                else if ((c > 191) && (c < 224)) {
                    c2 = utftext.charCodeAt(i + 1);
                    string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                    i += 2;
                }
                else {
                    c2 = utftext.charCodeAt(i + 1);
                    c3 = utftext.charCodeAt(i + 2);
                    string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                    i += 3;
                }

            }

            return string;
        }

    }


    var keyStr = "ABCDEFGHIJKLMNOP" +
            "QRSTUVWXYZabcdef" +
            "ghijklmnopqrstuv" +
            "wxyz0123456789+/" +
            "=";

    function encode64(input) {
        var output = "";
        var chr1, chr2, chr3 = "";
        var enc1, enc2, enc3, enc4 = "";
        var i = 0;

        do {
            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);

            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;

            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }

            output = output +
        keyStr.charAt(enc1) +
        keyStr.charAt(enc2) +
        keyStr.charAt(enc3) +
        keyStr.charAt(enc4);
            chr1 = chr2 = chr3 = "";
            enc1 = enc2 = enc3 = enc4 = "";
        } while (i < input.length);

        return output;
    }

    function decode64(input) {
        var output = "";
        var chr1, chr2, chr3 = "";
        var enc1, enc2, enc3, enc4 = "";
        var i = 0;

        // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
        var base64test = /[^A-Za-z0-9\+\/\=]/g;
        if (base64test.exec(input)) {
            alert("There were invalid base64 characters in the input text.\n" +
           "Valid base64 characters are A-Z, a-z, 0-9, �+�, �/�, and �=�\n" +
           "Expect errors in decoding.");
        }
        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

        do {
            enc1 = keyStr.indexOf(input.charAt(i++));
            enc2 = keyStr.indexOf(input.charAt(i++));
            enc3 = keyStr.indexOf(input.charAt(i++));
            enc4 = keyStr.indexOf(input.charAt(i++));

            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;

            output = output + String.fromCharCode(chr1);

            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }

            chr1 = chr2 = chr3 = "";
            enc1 = enc2 = enc3 = enc4 = "";

        } while (i < input.length);

        return output;
    }

Answer 1

您需要对字符进行 UTF-8 编码，还是只需要一种方法将这些字符放入 JavaScipt 字符串？我建议使用 unicode 转义序列（参见UnicodeMozilla Developer Center）。例如，版权字符表示为“\u00A9”。 unicode 转义序列的好处是它们可以存在于使用 iso-8859-1 编码的源文件中，但仍然允许任何 unicode 字符。

有关如何在 C# 中生成这些转义序列的示例，请参阅 Converting Unicode strings to escaped ascii string。

Answer 2

您似乎将数据编码为 UTF-8 两次，您是在 silverlight 中进行的：-

Encoding.UTF8.GetBytes(data)

然后你用 Javascript 再做一次

parameters = UTF8.encode(decode64(parameters));

你确定这行不应该是：-

parameters = UTF8.decode(decode64(parameters));

？

您没有在 Silverlight 中使用 WebClient 或 WebRequest 发布此帖子有什么原因吗？