Question

我正在使用以下代码下载并保存手机存储中的文件。

    var downloadUrl = encodeURI(cordova.file.dataDirectory + fileName);
    var fileTransfer = new FileTransfer();

    fileTransfer.download(
    "http://developer.android.com/assets/images/home/ics-android.png",
    downloadUrl,
    function(entry) {
    alert("download complete: " + entry.fullPath);
    },

    function(error) {
    alert("download error source " + error.source);
    alert("download error target " + error.target);
    alert("upload error code" + error.code);
    });

此代码在任何android设备上均能正常运行，但在iPhone上无法正常工作，并出现以下错误。

    download error source " the url used"
    download error target: " the target used "
    upload error code 1

我是iOS新手，有人可以帮助我解决此问题吗？并且让我知道执行此代码之前应授予的所有权限...

Answer 1

文件传输插件已弃用了一段时间（超过一年），您可能不应该花费太多时间来使文件传输插件正常工作。我建议按照博客文章中有关如何transition off the file api的说明进行操作。

因此对于您的代码（未经测试，但应该可以使用）：

window.requestFileSystem(cordova.file.dataDirectory, 0, function (fs) {
    console.log('file system open: ' + fs.name);
    fs.root.getFile(fileName, { create: true, exclusive: false }, function (fileEntry) {
        console.log('fileEntry is file? ' + fileEntry.isFile.toString());
        var oReq = new XMLHttpRequest();
        // Make sure you add the domain name to the Content-Security-Policy <meta> element.
        oReq.open("GET", "http://developer.android.com/assets/images/home/ics-android.png", true);
        // Define how you want the XHR data to come back
        oReq.responseType = "blob";
        oReq.onload = function (oEvent) {
            var blob = oReq.response; // Note: not oReq.responseText
            if (blob) {
                fileEntry.createWriter(function (fileWriter) {

                    fileWriter.onwriteend = function() {
                        console.log("Successful file write...");                        
                    };

                    fileWriter.onerror = function (e) {
                        console.log("Failed file write: " + e.toString());
                    };

                    fileWriter.write(blob);
                });
            } else {
                console.error('we didnt get an XHR response!');
            }
        };
        oReq.send(null);
    }, function (err) { 
        console.error('error getting file! ' + err); 
    });
}, function (err) { 
    console.error('error getting persistent fs! ' + err); 
});

Answer 2

要使其在iOS中正常运行，我必须将create（）放在平台就绪检查中。

constructor(platform: Platform, filetransfer: FileTransfer) {
    platform.ready().then(() => {
       this.Transfer = filetransfer.create();
    }
}

download(fileName){

    let lLocation = this.file.cacheDirectory + fileName;

    this.Transfer.download(
    "http://developer.android.com/assets/images/home/ics-android.png",
    lLocation).then().catch
}

Cordova File Transfer插件可将文件下载到iOS

2 个答案: