Tizen 下载 API 无法正常工作？

Question

我尝试使用 Tizen 下载 API 从服务器下载媒体（图像、视频、GIF 等），但它无法正确下载文件。这是我从 tizen 文档中使用的代码：

const downloadUrl = 'https://magic-sign.cloud/v4/web/MSlibrary/wi-night-partly-cloudy.jpg';
    const downloadFileName = 'wi-night-partly-cloudy.jpg';
  
    var downloadRequest = new tizen.DownloadRequest(downloadUrl, path, downloadFileName, 'ALL', {'Content-   Type' : 'image/jpeg'});
    
    tizen.systeminfo.getPropertyValue('NETWORK', function(networkInfo) {
        if (networkInfo.networkType === 'NONE') {
            console.log(`Network connection is not available.
                         Download is not possible.`);
            downloadRequest = null;
        }
    });

    var listener = {
        /* When the download progresses (interval is platform-dependent) */
        onprogress: function(id, receivedSize, totalSize) {
            console.log('Received with id: ' + id + ', ' + receivedSize + '/' + totalSize);
        },
    
        /* When the user pauses the download */
        onpaused: function(id) {
            console.log('Paused with id: ' + id);
        },
    
        /* When the user cancels the download */
        oncanceled: function(id) {
            console.log('Canceled with id: ' + id);
        },
    
        /* When the download is completed */
        oncompleted: function(id, fullPath) {
            console.log('Completed with id: ' + id + ', full path: ' + fullPath);
        },
    
        /* When the download fails */
        onfailed: function(id, error) {
            console.log('Failed with id: ' + id + ', error name: ' + error.name);
        }
    };
      
    let downloadId = tizen.download.start(downloadRequest, listener);
  
    tizen.download.getState(downloadId);

    var state = tizen.download.getState(downloadId);

    console.log(state);

    var downloadRequest = tizen.download.getDownloadRequest(downloadId);

    console.log(downloadRequest);

    var MIMEType = tizen.download.getMIMEType(downloadId);
    
    console.log(MIMEType);

当我尝试在启动方法之前 console.log 下载请求时，这就是我得到的：

这是启动方法之后的下载请求和 mime 类型，注意：我明确将内容类型设置为 image/jpeg:

此外，下载也没有问题。它一直说下载完成，并将文件存储在确切的位置，但该文件不是图像（在本例中，我尝试下载图像）：

我尝试使用 Tizen 下载 API 从服务器下载媒体（图像、视频、GIF 等），但它无法正确下载文件。这是存储到以下位置的文件输出：

注意：当我尝试使用浏览器或邮递员从同一 URL 获取图像时，它工作正常，我得到了具有正确尺寸和内容类型的图像。

有人遇到过这个问题吗？

Answer 1

我无法在我的设置中重现您的问题。

我鼓励您提供有关如何使用完整代码执行所有步骤的更多详细信息。目前很难确定可能出现的问题，因为您没有提供会生成屏幕截图上显示的无效结果的代码。

以下是我尝试按照您的步骤操作的方法：

const downloadUrl = 'https://magic-sign.cloud/v4/web/MSlibrary/wi-night-partly-cloudy.jpg';
const downloadFileName = 'wi-night-partly-cloudy.jpg';
const path = 'downloads';

function printRequest(downloadId, prefix) {
    var state = tizen.download.getState(downloadId);
    var downloadRequest = tizen.download.getDownloadRequest(downloadId);
    try { var MIMEType = tizen.download.getMIMEType(downloadId); } catch (e) { }
    console.log(prefix + " - Request: " + downloadId + ": " + JSON.stringify(downloadRequest) + ", state: " + state + ", mime type: " + MIMEType);
}

var downloadRequest = new tizen.DownloadRequest(downloadUrl, path, downloadFileName, 'ALL', { 'Content-   Type': 'image/jpeg' });

tizen.systeminfo.getPropertyValue('NETWORK', function (networkInfo) {
    if (networkInfo.networkType === 'NONE') {
        console.log(`Network connection is not available.
                         Download is not possible.`);
        downloadRequest = null;
    }
});

var listener = {
    /* When the download progresses (interval is platform-dependent) */
    onprogress: function (id, receivedSize, totalSize) {
        //console.log('Received with id: ' + id + ', ' + receivedSize + '/' + totalSize);
        printRequest(id, "onprogress");
    },

    /* When the user pauses the download */
    onpaused: function (id) {
        console.log('Paused with id: ' + id);
    },

    /* When the user cancels the download */
    oncanceled: function (id) {
        console.log('Canceled with id: ' + id);
    },

    /* When the download is completed */
    oncompleted: function (id, fullPath) {
        printRequest(id, "oncompleted");
        console.log('Completed with id: ' + id + ', full path: ' + fullPath);
    },

    /* When the download fails */
    onfailed: function (id, error) {
        console.log('Failed with id: ' + id + ', error name: ' + error.name);
    }
};

let downloadId = tizen.download.start(downloadRequest, listener);
printRequest(downloadId, "After start");

我在开始前、开始后（同步）、下载期间和下载完成后打印了下载请求和 MIME 类型。

After start - Request: 9: {"url":"https://magic-sign.cloud/v4/web/MSlibrary/wi-night-partly-cloudy.jpg","destination":"downloads","fileName":"wi-night-partly-cloudy.jpg","networkType":"ALL","httpHeader":{"Content-   Type":"image/jpeg"},"verifyHost":true}, state: QUEUED, mime type: undefined
onprogress - Request: 9: {"url":"https://magic-sign.cloud/v4/web/MSlibrary/wi-night-partly-cloudy.jpg","destination":"downloads","fileName":"wi-night-partly-cloudy.jpg","networkType":"ALL","httpHeader":{"Content-   Type":"image/jpeg"},"verifyHost":true}, state: DOWNLOADING, mime type: image/jpeg
onprogress - Request: 9: {"url":"https://magic-sign.cloud/v4/web/MSlibrary/wi-night-partly-cloudy.jpg","destination":"downloads","fileName":"wi-night-partly-cloudy.jpg","networkType":"ALL","httpHeader":{"Content-   Type":"image/jpeg"},"verifyHost":true}, state: COMPLETED, mime type: image/jpeg
oncompleted - Request: 9: {"url":"https://magic-sign.cloud/v4/web/MSlibrary/wi-night-partly-cloudy.jpg","destination":"downloads","fileName":"wi-night-partly-cloudy.jpg","networkType":"ALL","httpHeader":{"Content-   Type":"image/jpeg"},"verifyHost":true}, state: COMPLETED, mime type: image/jpeg
Completed with id: 9, full path: /opt/usr/home/owner/content/Downloads/wi-night-partly-cloudy.jpg

这样看来，每一步都正确设置了 mime 类型。 我还通过 sdb shell 确认该文件是有效的：

# file --mime-type -b wi-night-partly-cloudy.jpg 
image/jpeg

如果我的方法不适合您，请提供有关您使用哪个 Tizen 版本以及您的设置中使用哪种电视设备的更多详细信息。