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POSilverlight to Javascript interop UTF encoding/decoding
 

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  1. POSilverlight to Javascript interop UTF encoding/decoding
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    <p>How do I get both alerts, one invoked from silverlight and the other invoked from javascript, to show the same data in the same way. </p> <p>eg. ���� != ýÿýÿý</p> <p>System.Windows.Browser.HtmlPage.Window.Alert( data );</p> <p>alert(parameters);</p> <p>Silverlight3 code, sending data to javascript function:</p> <pre><code> 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);"); </code></pre> <p>javascript function:</p> <pre><code> function makePOSTRequest(url,parameters) { ... parameters = UTF8.encode(decode64(parameters)); alert(parameters); ... } </code></pre> <p>javascript library:</p> <pre><code> var UTF8 = { // public method for url encoding encode: function(string) { string = string.replace(/\r\n/g, "\n"); var utftext = ""; for (var n = 0; n &lt; string.length; n++) { var c = string.charCodeAt(n); if (c &lt; 128) { utftext += String.fromCharCode(c); } else if ((c &gt; 127) &amp;&amp; (c &lt; 2048)) { utftext += String.fromCharCode((c &gt;&gt; 6) | 192); utftext += String.fromCharCode((c &amp; 63) | 128); } else { utftext += String.fromCharCode((c &gt;&gt; 12) | 224); utftext += String.fromCharCode(((c &gt;&gt; 6) &amp; 63) | 128); utftext += String.fromCharCode((c &amp; 63) | 128); } } return utftext; }, // public method for url decoding decode: function(utftext) { var string = ""; var i = 0; var c = c1 = c2 = 0; while (i &lt; utftext.length) { c = utftext.charCodeAt(i); if (c &lt; 128) { string += String.fromCharCode(c); i++; } else if ((c &gt; 191) &amp;&amp; (c &lt; 224)) { c2 = utftext.charCodeAt(i + 1); string += String.fromCharCode(((c &amp; 31) &lt;&lt; 6) | (c2 &amp; 63)); i += 2; } else { c2 = utftext.charCodeAt(i + 1); c3 = utftext.charCodeAt(i + 2); string += String.fromCharCode(((c &amp; 15) &lt;&lt; 12) | ((c2 &amp; 63) &lt;&lt; 6) | (c3 &amp; 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 &gt;&gt; 2; enc2 = ((chr1 &amp; 3) &lt;&lt; 4) | (chr2 &gt;&gt; 4); enc3 = ((chr2 &amp; 15) &lt;&lt; 2) | (chr3 &gt;&gt; 6); enc4 = chr3 &amp; 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 &lt; 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 &lt;&lt; 2) | (enc2 &gt;&gt; 4); chr2 = ((enc2 &amp; 15) &lt;&lt; 4) | (enc3 &gt;&gt; 2); chr3 = ((enc3 &amp; 3) &lt;&lt; 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 &lt; input.length); return output; } </code></pre>
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