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我需要從本地硬盤讀取圖像文件並將其轉換爲base64格式。轉換後，我需要將base64字符串傳遞給web服務，並從web服務獲取結果。在JavaScript中將圖像（jpg）轉換爲Base64格式時出現問題
我有一個代碼是相同的：
<html>
<script>
// create the object
//test = new Base64();
x = new XMLHttpRequest();
// set the function that should be called when
// the ready state changes (the callback)
x.onreadystatechange = handleDoc;
// establish the method and URL
//x.open('GET', "Latest Eticket.jpg", true);
x.overrideMimeType("text/plain; charset=x-user-defined");
x.open('GET', 'file:///C:\\vishwa\\Node_JS\\Jquery_ajax\\JS_with_Ajax\\base64_encode\\Latest Eticket.jpg', true);
//x.open('GET', 'C:\vishwa\Node_JS\Jquery_ajax\JS_with_Ajax\base64_encode\Latest Eticket.jpg', true);
//x.open('GET', 'http://www.google.co.in/imgres?imgurl=http://1.bp.blogspot.com/_PveGYAt2T10/TDRH1kJsXAI/AAAAAAAAAgI/a45pNA5hxrA/s1600/hi-pig.jpg&imgrefurl=http://weiwei95.blogspot.com/2010_07_01_archive.html&usg=__k761BPCJk7FGxAgy8UHUiCCO1dA=&h=474&w=600&sz=51&hl=en&start=1&sig2=K2Z27chXr6EPO-lHJVY43g&zoom=1&tbnid=NSx-UedGEdm84M:&tbnh=107&tbnw=135&ei=uezUTbaDFMSBgAet_7iVDA&prev=/search%3Fq%3Dhi%26hl%3Den%26biw%3D1024%26bih%3D548%26gbv%3D2%26tbm%3Disch&itbs=1', true);
//x.open('GET', 'http://localhost:80//Latest Eticket.jpg', true);
// initiate the HTTP transaction
x.send(null);
//
function handleDoc() {
//window.alert("READY STATE IS " +
//x.readyState);
if(x.readyState == 1)
{
window.alert("Handling x 1 State: The response is started");
}
if(x.readyState == 4)
{
var encodeImagescanned_image = '';
alert("Am i coming here 4-2"+x.responseText);
//var base64 = new Base64();
encodeImagescanned_image = encode(x.responseText);
alert("Am i coming here 4-3"+encodeImagescanned_image);
window.alert("Handling x 4 State: The response is ended");
alert("Constructing Soap body");
var xmlp = "<soapenv:Envelope xmlns:soapenv=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:dsf=\"http://DSFService/\">" +
"<soapenv:Header/>" +
"<soapenv:Body>" +
"<dsf:FieldExtraction>" +
"<dsf:inImage>" +
this.encodeImagescanned_image +
"</dsf:inImage>" +
"</dsf:FieldExtraction>" +
"</soapenv:Body>" +
"</soapenv:Envelope>";
var xmlps = "<soapenv:Envelope xmlns:soapenv=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:dsf=\"http://DSFService/\">" +
"<soapenv:Header/>" +
"<soapenv:Body>" +
"<dsf:FieldExtraction>" +
"<dsf:inImage>" +
"</dsf:inImage>" +
"</dsf:FieldExtraction>" +
"</soapenv:Body>" +
"</soapenv:Envelope>";
var dsfUrl = "http://hpldsf-tst.asiapacific.cpqcorp.net:8090/DSFServiceSite/DSFService.svc/basic";
request = new XMLHttpRequest();
// We're going to be POSTing to this URL and want a synchronous response
request.open("POST", dsfUrl, true);
request.setRequestHeader("Content-Type", "text/xml;charset=UTF-8");
request.setRequestHeader("Content-length", xmlp.length);
request.setRequestHeader("Accept-Encoding", "gzip,deflate");
request.timeout = 300000;
// This header is a required part of the SOAP protocol
request.setRequestHeader("SOAPAction", '\"http://DSFService/DSFService/FieldExtraction\"');
// Now send an XML-formatted SOAP request to the server
request.send(xmlp);
request.onreadystatechange = handlesoap;
}
}
function handlesoap()
{
alert("Inside handlesoap function");
if(request.readyState == 4)
{
var xmls = request.responseText;
var xmlDoc = (new DOMParser()).parseFromString(xmls, "text/xml");
var doc = xmlDoc.documentElement;
var nvalue = xmlDoc.getElementsByTagName('FieldExtractionResponse')[0];
alert("nvalu ="+nvalue);
if ((nvalue !== null) && (nvalue !== undefined))
{
////var docidval = nodes.getAttribute("id");
///Mojo.Log.info("docidval:" + docidval);
dsfxml = xmls; //nodes.nodeValue;
var pattern = /\cM/;
// Break the string into pieces separated by the pattern above and
// and store the pieces in an array called nameList
var nameList = [];
nameList = dsfxml.split(pattern);
var clean = '';
for (i = 0; i < nameList.length; i++) {
clean = clean + nameList[i].replace(pattern, "").trim();
}
}
else
{
alert("nvalue is eitheer null or undefined");
}
}
}
function encode(input) {
alert("I am in encode function");
var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz/=";
var output = "";
var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
var i = 0;
while (i < input.length) {
chr1 = input.charCodeAt(i++) & 0xff; //alert('chr1 : ' + chr1.toString(16));
chr2 = input.charCodeAt(i++) & 0xff; //alert('chr2 : ' + chr2.toString(16));
chr3 = input.charCodeAt(i++) & 0xff; //alert('chr3 : ' + chr3.toString(16));
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);
}
return output;
}
</script>
</html>
的問題是其不能正常轉換圖像Base64格式。你能幫我知道我哪裏出錯了嗎......
這是相當多的代碼挖通過..至少你有沒有嘗試通過調試器？ – 2011-05-20 02:06:56