將位圖對象上傳到Azure blob存儲

Question

我試圖下載，調整大小然後將圖像上傳到Azure blob存儲。

我可以下載原始圖像，並調整其大小，像這樣：

private bool DownloadandResizeImage(string originalLocation, string filename) 
    { 
     try 
     { 
      byte[] img; 
      var request = (HttpWebRequest)WebRequest.Create(originalLocation); 

      using (var response = request.GetResponse()) 
      using (var reader = new BinaryReader(response.GetResponseStream())) 
      { 
       img = reader.ReadBytes(200000); 
      } 

      Image original; 

      using (var ms = new MemoryStream(img)) 
      { 
       original = Image.FromStream(ms); 
      } 

      const int newHeight = 84; 
      var newWidth = ScaleWidth(original.Height, 84, original.Width); 

      using (var newPic = new Bitmap(newWidth, newHeight)) 
      using (var gr = Graphics.FromImage(newPic)) 
      { 
       gr.DrawImage(original, 0, 0, newWidth, newHeight); 
       // This is where I save the file, I would like to instead 
       // upload it to Azure 
       newPic.Save(filename, ImageFormat.Jpeg); 


      } 

      return true; 
     } 
     catch (Exception e) 
     { 
      return false; 
     } 

    } 

我知道我可以使用UploadFromFile上傳保存的文件，但不知道是否有一種方法可以直接從我的目標做，所以我不必先保存它？我已經嘗試從流上傳，並且可以在使用ms函數後執行此操作，但是隨後我調整文件大小

Answer 1

以下是上傳blob的示例，您將其作爲Stream。它使用Azure客戶端SDK：

private async Task WriteBlob(Stream blob, string containerName, string blobPath) 
{ 
    // Retrieve storage account from connection string. 
    CloudStorageAccount storageAccount = CloudStorageAccount.Parse(_blobcnxn); 

    // Create the blob client. 
    CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient(); 

    // Retrieve a reference to a container. 
    CloudBlobContainer container = blobClient.GetContainerReference(containerName); 
    // Create the container if it doesn't already exist. 
    await container.CreateIfNotExistsAsync(); 

    // create a blob in the path of the <container>/email/guid 
    CloudBlockBlob blockBlob = container.GetBlockBlobReference(blobPath); 

    await blockBlob.UploadFromStreamAsync(blob); 
}