BingoTouch文件操作

☻FileReader对象

FileReader是W3C文件API的一部分，提供了四种方法异步加载File对象引用的文件的数据：

§ .readAsText(File f, [encoding]): 读取 File对象F并赋予一个字符串。 UTF-8编码是假设，但可以通过指定编码参数[encoding]设置一个不同的格式。

§ .readAsDataURL(File f):将File对象F读取为编码过的数据URL。

§ .readAsBinaryString(File f):将File对象F读取为一个二进制字符串。

§ .readAsArrayBuffer(File f): 将File对象F读取为一个 ArrayBuffer 对象。

来自 <http://article.yeeyan.org/view/286167/252343>

☻下载

//检查版本

$("#btnCheckVersion").tap(function(e){

//获取到当前应用标识

app.getInfo(function(appObj){

var appId=appObj.id;

//获取升级地址

app.setting.get("upgradeUrl","",function(checkUrl){

//checkUrl="http://developer.bingosoft.net:7080/bingo.touch.packager/bt/upgrade/bfa4402853c6426fb1e583d6ba6e51ff";

//发请求检查是否有新版本

var split = checkUrl.indexOf("?")!=-1?"&":"?" ;

app.progress.start("","正在检查更新...");

app.post(checkUrl+split+new Date().getTime() , {} , function(response){

                if( typeof response=="object" && $.trim(response.returnValue) ){

                        var obj = eval( "("+$.trim(response.returnValue)+")" ) ;

                        app.progress.stop();

                        app.confirm("检测到有新版本:"+obj.versionCode+", 是否下载安装?",function(index){

                                if(index==1){

                                        app.progress.start("","正在下载更新...");

                                        if(window.devicePlatform=="android"){

                                var fileTransfer = new FileTransfer();

                                var uri = encodeURI(obj.upgradeUrl);

                                var fileName=appId+"_"+obj.versionCode+"."+uri.substr(uri.lastIndexOf('.')+1);

                                var filePath="/sdcard/download/"+fileName;

                                fileTransfer.download(

uri,

filePath,

function(entry) {

        app.progress.stop();

        app.hint("下载到:"+entry.fullPath);

        console.log("download complete: " + entry.fullPath);

        app.confirm("已经下载完成,是否立刻安装?",function(index){

                if(index==1){

                        //安装指定文件

                        app.install(filePath);

                }

        });

},

function(error) {

app.progress.stop();

console.log("download error source " + error.source);

console.log("download error target " + error.target);

console.log("upload error code" + error.code);

},

false,

{

headers: {

"Authorization": "Basic dGVzdHVzZXJuYW1lOnRlc3RwYXNzd29yZA=="

}

}

                                        );

                        }else if(window.devicePlatform="iOS") {

                                //iOS的话就直接打开浏览器，地址是.plist

                                app.run(res.upgradeUrl,"");

                        }

                                }

                        });

                }else{

                        app.progress.stop();

                        app.alert("已经是最新版本!");

                }

        },function(res){

                app.alert(res.returnValue);

        });

});

});

});

//退出应用

$("#btnExit").tap(function(e){

app.exit();

});

});