Azure

Question

我正在尝试将图像上传到 Azure 存储容器。

使用 UploadBlobWithRestAPI，我正在尝试调用其余 PUT API 并使用 AuthorizationHeader，我正在尝试为 API 调用创建授权。

我正在获取在容器中创建的图像。但是，由于某种原因，图像不是可读格式。从容器下载图像并尝试在资源管理器中打开时，出现“看来我们不支持这种文件格式”。有什么想法吗？

      public void UploadBlobWithRestAPI(string MachineName,string ImageName)
        {

            string storageKey = "Storagekey";
            string storageAccount = "Account";
            string containerName = "test-container";
            string blobName = "test2.jpg";

            string method = "PUT";
            Byte[] imageContentBytes = System.IO.File.ReadAllBytes(@"C:\Test2.jpg");
            int imageContentLength = (Encoding.UTF8.GetString(imageContentBytes)).Length;

            string requestUri = $"https://{storageAccount}.blob.core.windows.net/{containerName}/{blobName}";

            System.Net.HttpWebRequest request = (HttpWebRequest)WebRequest.Create(requestUri);

            string now = DateTime.UtcNow.ToString("R");

            request.Method = method;
            request.ContentType = "application/octet-stream";
            request.ContentLength = imageContentLength;

            request.Headers.Add("x-ms-version", "2015-12-11");
            request.Headers.Add("x-ms-date", now);
            request.Headers.Add("x-ms-blob-type", "BlockBlob");
            request.Headers.Add("Authorization", AuthorizationHeader(method, now, request, storageAccount, storageKey, containerName, blobName));

            using (Stream requestStream = request.GetRequestStream())
            {
                                requestStream.Write(Encoding.UTF8.GetBytes(Encoding.UTF8.GetString(imageContentBytes)), 0, imageContentLength);
            }

            using (HttpWebResponse resp = (HttpWebResponse)request.GetResponse())
            {
                MessageBox.Show(resp.StatusCode.ToString());
            }

        }

        public string AuthorizationHeader(string method, string now, HttpWebRequest request, string storageAccount, string storageKey, string containerName, string blobName)
        {

            string headerResource = $"x-ms-blob-type:BlockBlob\nx-ms-date:{now}\nx-ms-version:2015-12-11";
            string urlResource = $"/{storageAccount}/{containerName}/{blobName}";
            string stringToSign = $"{method}\n\n\n{request.ContentLength}\n\n{request.ContentType}\n\n\n\n\n\n\n{headerResource}\n{urlResource}";

            HMACSHA256 hmac = new HMACSHA256(Convert.FromBase64String(storageKey));
            string signature = Convert.ToBase64String(hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign)));

            String AuthorizationHeader = String.Format("{0} {1}:{2}", "SharedKey", storageAccount, signature);
            return AuthorizationHeader;
        }

Answer 1

我认为问题来了，因为您将图像（二进制内容）作为字符串上传，这会破坏数据。

请尝试更改以下内容：

int imageContentLength = (Encoding.UTF8.GetString(imageContentBytes)).Length;

到

int imageContentLength = imageContentBytes.Length;

和

using (Stream requestStream = request.GetRequestStream())
{
    requestStream.Write(Encoding.UTF8.GetBytes(Encoding.UTF8.GetString(imageContentBytes)), 0, imageContentLength);
}

到

using (Stream requestStream = request.GetRequestStream())
{
    requestStream.Write(imageContentBytes, 0, imageContentLength);
}

另外，请为内容类型设置正确的值。考虑到您上传的文件是 JPEG 图片，请将内容类型设置为 image/jpeg 而不是 application/octet-stream。这将确保图像在浏览器中加载时正确显示。

Azure - C# - 使用 Rest API 上传图像时出错

Azure - C# - Error while uploading image using Rest API

c#

rest

azure-blob-storage