Question

我正在尝试仅使用纯Javascript和SDK来执行此操作。我不正在使用Node.js。我正在将我的应用程序从SDK azure-storage-js-v10的v2转换为v10

azure-storage.blob.js捆绑文件与UMD兼容标准，如果未找到模块系统，则遵循全局变量将被导出： azblob

我的代码在这里：

const serviceURL = new azblob.ServiceURL(`https://${account}.blob.core.windows.net${accountSas}`, pipeline);
const containerName = "container";
const containerURL = azblob.ContainerURL.fromServiceURL(serviceURL, containerName);
const blobURL = azblob.BlobURL.fromContainerURL(containerURL, blobName);

const downloadBlobResponse = await blobURL.download(azblob.Aborter.none, 0);

downloadBlobResponse如下所示： downloadBlobResponse

使用v10，如何将downloadBlobResponse转换为新的Blob，以便可以在FileSaver saveAs（）函数中使用它？

在azure-storage-js-v2中，此代码适用于较小的文件：

let readStream = blobService.createReadStream(containerName, blobName, (err, res) => {
    if (error) {
        // Handle read blob error
    }
});

// Use event listener to receive data
readStream.on('data', data => {
    // Uint8Array retrieved
    // Convert the array back into a blob
    var newBlob = new Blob([new Uint8Array(data)]);
    // Saves file to the user's downloads directory
    saveAs(newBlob, blobName); // FileSaver.js
});

我已尽一切努力使v10正常工作，任何帮助将不胜感激。

谢谢

Answer 1

您需要通过等待blobBody来获取尸体。

downloadBlobResponse = await blobURL.download(azblob.Aborter.none, 0);

// data is a browser Blob type
const data = await downloadBlobResponse.blobBody;

Answer 2

感谢Xiaoning Liu！

我仍在学习异步javascript函数和promise。猜猜我只是想念另一个“ 等待”。我看到“ downloadBlobResponse.blobBody”是一个承诺，也是一个blob类型，但是，我不知道为什么它不能转换为新的blob。我不断收到“ 迭代器getter不可调用”错误。

这是我最后的工作解决方案：

// Create a BlobURL
const blobURL = azblob.BlobURL.fromContainerURL(containerURL, blobName);

// Download blob
downloadBlobResponse = await blobURL.download(azblob.Aborter.none, 0);

// In browsers, get downloaded data by accessing downloadBlockBlobResponse.blobBody
const data = await downloadBlobResponse.blobBody;

// Saves file to the user's downloads directory
saveAs(data, blobName); // FileSaver.js

Answer 3

感谢 Mike Coop 和刘晓宁！

我正忙于制作一个 Vuejs 插件来从存储帐户下载 blob。感谢您，我能够完成这项工作。

var FileSaver = require('file-saver');
const { BlobServiceClient } = require("@azure/storage-blob");
const downloadButton = document.getElementById("download-button");

const downloadFiles = async() => {
    try {
        if (fileList.selectedOptions.length > 0) {
            reportStatus("Downloading files...");
            for await (const option of fileList.selectedOptions) {
                var blobName = option.text;
                const account = '<account name>';
                const sas = '<blob sas token>';
                const containerName = '< container name>';
                const blobServiceClient = new BlobServiceClient(`https://${account}.blob.core.windows.net${sas}`);
                const containerClient = blobServiceClient.getContainerClient(containerName);
                const blobClient = containerClient.getBlobClient(blobName);
                const downloadBlockBlobResponse = await blobClient.download(blobName, 0, undefined);
                const data = await downloadBlockBlobResponse.blobBody;
                // Saves file to the user's downloads directory
                FileSaver.saveAs(data, blobName); // FileSaver.js
            }
            reportStatus("Done.");
            listFiles();
        } else {
            reportStatus("No files selected.");
        }
    } catch (error) {
        reportStatus(error.message);
    }
};

downloadButton.addEventListener("click", downloadFiles);

使用纯JavaScript和Azure-Storage-Js下载Azure Storage Blob

3 个答案: