访问使用Cordova编写的文件

我在worklight中使用Cordova文件API创建了一个文件。一旦写入事件完成，我将读取文件。我尝试在writer.onwriteend事件中编写函数调用readAsText（）。但该文件没有被读取。 “独家”选项与此有关吗？一切工作正常，直到read（），然后没有错误，没有消息..但我认为它不是读取文件。但是，一旦错误发生在reader.onloadend事件：访问使用Cordova编写的文件

读取错误 { “类型”： “错误”， “泡沫”：假的， “cancelBubble”：假的， “取消”：假” lengthComputable “：假，” 加载 “：0，” 总 “：0，” 目标 “：{” 文件名 “：” 文件：// C：\用户\ IBM_ADMIN \科尔多瓦\文件系统\持久\ RQM \ ExecutionResult.xml” “readyState的”：2 “结果”：NULL， “错误”：{ “代码”：1}， “onloadstart”：NULL， “onprogress”：空 “的onload”：NULL， “onabort”：空}}

这里是我的代码：

window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, 
     onFileSystemSuccess, fail); 


function onFileSystemSuccess(fileSystem) { 
alert("Created File system "); 
fileSystem.root.getFile("ExecutionResult.xml", { 
    create : true, 
    exclusive : true 
}, gotFileEntry, fail); 
function gotFileEntry(fileEntry) { 
fileEntry.createWriter(gotFileWriter, fail); 
} 
function gotFileWriter(writer) { 
writer.write(JsonData); 

writer.onwriteend = function(evt) { 
    readAfterWriting(); 
}; 
} 
function readAfterWriting(){ 
    fileSystem.root.getFile("ExecutionResult.xml", { 
     create : false, 
     exclusive : false 
    }, gotFile, fail); 

}; 
} 
function gotFile(file) { 
readAsText(file); 
} 
function readAsText(file) { 
var reader = new FileReader(); 
reader.onloadend = function(evt) { 
    console.log("Read as text"); 
    console.log(evt.target.result); 
}; 
reader.readAsText(file); 
}

这是发生错误的代码。文件名显示为22. 这里是显示的行.. var callbackId = v.id;

window.addEventListener("message", function(e){ 
    _consoleLog("*****PG BC***** " + e.domain + " said: " + e.data); 
    var r = e.data; 

    // If a result was returned 
    _consoleLog("typeof result=" + (typeof r) + " r=" + r); 
    if (r.length > 0) { 
     // if ((typeof r == "string") && (r.length > 0)) { 
     _consoleLog("Result from exec=<" + dumpObj(r, '', ' ', 2) + ">"); 
     eval("var v=" + r + ";"); 
     var callbackId = v.id; 
     var cast = v.cast; 
     // var temp = "+cast+"("+this.getJSONString() + ");\n" 
     if (cast) { 
      // _consoleLog("CAST==="+"var 
      // temp="+cast+"("+JSON.stringify(v.message)+");\n"); 
      // eval("var temp="+cast+"("+JSON.stringify(v.message)+");\n"); 
      // _consoleLog("***** CAST:"+" var temp="+cast+"("+r+");"); 
      eval("var temp=" + cast + "(" + r + ");"); 
      v = temp; 
     } 
     // _consoleLog("After CAST="+dumpObj(v, '', ' ', 3)); 

     // If status is OK, then return value back to caller 
     if (v.status === Cordova.callbackStatus.OK) { 

      // If there is a success callback, then call it now with 
      // returned value 
      if ((typeof(Cordova.callbacks[callbackId]) != 'undefined') 
       && (Cordova.callbacks[callbackId] != null)) { 
       if (Cordova.callbacks[callbackId].success) { 
        try { 
         Cordova.callbacks[callbackId].success(v.message); 
        } catch (e) { 
         _consoleLog("Error in success callback: " + callbackId + " = " + e); 
        } 

        // Clear callback if not expecting any more results 
        if (!v.keepCallback) { 
         delete Cordova.callbacks[callbackId]; 
        } 
       } 
      } 
      return v.message; 
     }

来源

2013-04-18 Ashwini Maddala

请原谅我的无知，但如果是 'V'？ “v is null” – 2013-04-18 04:42:11

它显示来自http：// localhost：8080/apps/services/preview/RQMLight/android/1.0/default/wlclient/js/cordova.js文件中某个文件的V当我调试时。 – 2013-04-18 04:49:53

这个信息看起来非常重要，然后，这个错误。如何从包含'v'的其他文件添加代码？ – 2013-04-18 04:51:35

下面是一些代码，做你所期望的：

<!DOCTYPE html> 
<html> 
<head> 
<title>FileReader Example</title> 
<meta name="viewport" 
    content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no"> 

<script type="text/javascript" charset="utf-8"> 

    onWLReady = function() { 
     // Wait for PhoneGap to load 
     document.addEventListener("deviceready", onDeviceReady, false); 
    } 

    var wlInitOptions = { 
     onSuccess : onWLReady, 
     connectOnStartup : false 
    }; 

    if (window.addEventListener) { 
     window.addEventListener('load', function() { 
      WL.Client.init(wlInitOptions); }, false); 
    } else if (window.attachEvent) { 
     window.attachEvent('onload', function() { 
      WL.Client.init(wlInitOptions); 
     }); 
    } 

    function log(txt){ 
     var p = document.createElement('p'); 
     document.getElementById("log").appendChild(p); 
     p.appendChild(document.createTextNode(txt)); 
    } 

    // PhoneGap is ready 
    // 
    function onDeviceReady(){ 
     log("onDeviceReady"); 
    } 

    function readFile() { 
     window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, 
      function(fileSystem) { 
       fileSystem.root.getFile("ExecutionResult.xml", { 
        create : false, exclusive: false 
       }, 
       function(fileEntry){ 
        fileEntry.file(function(file) { 
         readDataUrl(file); 
         readAsText(file); 
        }, 
        fail); 
       }, 
       fail); 
     }, fail); 
    } 

    function writeFile() { 
     window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, 
      function(fileSystem) { 
      fileSystem.root.getFile("ExecutionResult.xml", {create: true,  exclusive: true}, 
        function(fileEntry) { 
         fileEntry.createWriter(
          function(writer) { 
           writer.onwriteend = function(evt) { 
            readFile(); 
           }; 
          writer.onwritestart =  function(evt){ 
            log("onwritestart"); 
           }; 
           writer.onwrite = function(evt){ 
            log("onwrite"); 
           }; 
           writer.onerror = function(evt){ 
            log("onerror"); 
           }; 
           writer.write("JSonData"); 
          }, 
          fail); 
         } 
         , fail); 
      }, 
      fail); 
    } 

    function readDataUrl(file){ 
     var reader = new FileReader(); 
     log("readDataUrl..."); 
     reader.onloadstart = function(evt){ 
      log("onloadstart: " + evt.target.result); 
     }; 
     reader.onload = function(evt){ 
      log("onload: " + evt.target.result); 
     }; 
     reader.onloadend = function(evt){ 
      log("onloadend: " + evt.target.result); 
     }; 
     reader.onerror = function(evt){ 
      log("onerror: " + evt.target.result); 
     }; 
     reader.readAsDataURL(file); 
    } 

    function readAsText(file) { 
     var reader = new FileReader(); 
     log("readAsText..."); 
     reader.onloadstart = function(evt){ 
      log("onloadstart: " + evt.target.result); 
     }; 
     reader.onload = function(evt){ 
      log("onload: " + evt.target.result); 
     }; 
     reader.onloadend = function(evt){ 
      log("onloadend: " + evt.target.result); 
     }; 
     reader.onerror = function(evt){ 
      log("onerror: " + evt.target.result); 
     }; 
     reader.readAsText(file); 
    } 

    function fail(error) { 
     log("fail: "+ evt.target.error.code); 
    } 
</script> 
</head> 
<body id="content"> 
    <button onclick="writeFile();">Write and read file</button> 
    <p id="log"></p> 
</body> 
</html>

希望这有助于...

来源

2013-04-18 16:44:33 JulienC

访问使用Cordova编写的文件

回答

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