Question

public static string GetAvatar()
{
    logger.Info("Start--GetAvatar");//aatif
   // string headerText = "Bearer " + token;
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://api.mxit.com/user/public/avatar/id");
    //request.Method = method;
    //request.Headers.Add(HttpRequestHeader.Authorization, headerText);
    //if (contentType != null)
    //{
    //    request.ContentType = contentType;
    //}

    string method = "GET";
    if (method == "GET")
    {
        try
        {
            WebResponse response = request.GetResponse(); // Byte Stream
            Stream dataStream = response.GetResponseStream();
            StreamReader reader = new StreamReader(dataStream);
            string responseFromServer = reader.ReadToEnd();
            string JsonGET = responseFromServer.ToString();

           // Avatar res = JsonConvert.DeserializeObject<Avatar>(JsonGET);
            reader.Close();
            dataStream.Close();
            response.Close();
            logger.Info("End--GetAvatar");//aatif
            return JsonGET;
        }

        catch (Exception ex)
        {

            logger.Error("CacheData.GetAvatar():" + ex.StackTrace);   /// Aatif 

        }
    }
    logger.Info("End--GetAvatar"); ///aatif
    return null;
}



 string avatar = MURLEngine.GetAvatar();

在前端显示图片：

  <span id="ProfileImage">
                <img src="data:image/png;base64,@Model.avatarimage" />

            </span>

如何在前端显示字节流图像？我现在无法这样做。

Answer 1

你关闭了。转换为base64。

（其他答案并不直接与您对WebRequest的需求有关。）

public static string GetAvatar()
{
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://api.mxit.com/user/public/avatar/vini.katyal");

    WebResponse response = request.GetResponse();
    Stream responseStream = response.GetResponseStream();
    MemoryStream ms = new MemoryStream();

    responseStream.CopyTo(ms);

    byte[] buffer = ms.ToArray();

    string result = Convert.ToBase64String(buffer);

    response.Close();
    responseStream.Close();

    return result;
}

Answer 2

我建议您在控制器中创建一个GET方法，该方法接受您的行或其他内容的ID。基于此，只需获取字节数组并将其发送回作为contentresult。这是一个例子：

[AcceptVerbs(HttpVerbs.Get)]
public ActionResult Image(int id)
{
    byte[] byteArray = _imageRepository.GetImage(id);
    return new FileContentResult(byteArray, "image/jpeg");
}

在视图中，您可以通过以下方式调用此控制器方法：

<img src="Image/1234" alt="Image 1234"/>

Answer 3

尝试使用Convert类方法。您可以使用Convert.ToBase64String方法将字节数组转换为图像的base64字符串表示。

来自MSDN的示例：

try {
      inFile = new System.IO.FileStream(inputFileName,
                                System.IO.FileMode.Open,
                                System.IO.FileAccess.Read);
      binaryData = new Byte[inFile.Length];
      long bytesRead = inFile.Read(binaryData, 0,
                           (int)inFile.Length);
      inFile.Close();
   }
   catch (System.Exception exp) {
      // Error creating stream or reading from it.
      System.Console.WriteLine("{0}", exp.Message);
      return;
   }

   // Convert the binary input into Base64 UUEncoded output. 
   string base64String;
   try {
       base64String = 
         System.Convert.ToBase64String(binaryData, 
                                0,
                                binaryData.Length);
   }
   catch (System.ArgumentNullException) {
      System.Console.WriteLine("Binary data array is null.");
      return;
   }

以下是我found的另一个例子。

Answer 4

我解决了这个问题：

            WebResponse response = request.GetResponse();


            byte[] b = null;
            using (Stream stream = response.GetResponseStream())
            using (MemoryStream ms = new MemoryStream())
            {
                int count = 0;
                do
                {
                    byte[] buf = new byte[1024];
                    count = stream.Read(buf, 0, 1024);
                    ms.Write(buf, 0, count);
                } while (stream.CanRead && count > 0);
                b = ms.ToArray();
            }


            return Convert.ToBase64String(b);

我首先将响应转换为Stream然后转换为Byte数组，然后转换为base64字符串

显示字节流图像asp.net mvc

4 个答案: