谷歌Chrome打包应用程序 - FTP上传

Question

我正在尝试创建可以将文件上传到已知FTP服务器的Chrome APP，但是当我尝试发送文件时，我的代码只会创建一个名称为0KB的文件

所有指导意见都得到了赞赏。

function ab2str(buf) {
   return String.fromCharCode.apply(null, new Uint8Array(buf));
 }
function str2ab(str) {
   var buf = new ArrayBuffer(str.length); // 2 bytes for each char
   var bufView = new Uint8Array(buf);
   for (var i=0, strLen=str.length; i<strLen; i++) {
     bufView[i] = str.charCodeAt(i);
   }
   return buf;
 }

chrome.sockets.tcp.create( {persistent:false }, function(createInfo) {
    socketID = createInfo.socketId;
    chrome.sockets.tcp.connect( socketID, IP, PORT, onCallback);
});

function onCallback( result ){
    console.log( "onCallback", result );    
};

chrome.sockets.tcp.onReceive.addListener(function(info) {
var d = ab2str( info.data );

if (d.indexOf("220 ")>-1){

    // send user.
    console.log( "send " + ftp_username);
    chrome.sockets.tcp.send( socketID, str2ab("USER "+ftp_username+"\n"), onCallback );
}
if (d.indexOf("331 ")>-1){
    // send password.
    console.log( "send password");

    chrome.sockets.tcp.send( socketID, str2ab("PASS "+ftp_password+"\n"), onCallback );
}
if (d.indexOf("230 ")>-1){

    chrome.sockets.tcp.send( socketID, str2ab("PASV\n"), function(e, outstream) {
       chrome.sockets.tcp.send( socketID, str2ab("STOR icon.png\n"), onCallback );     

    } );
}

});