3

我正在创建一个 WCF Rest 服务以从移动应用程序上传图像。但我收到远程服务器返回错误：（400）错误请求。谁能指出我做错了什么。以下是我的定义：

    [OperationContract]
    [WebInvoke(BodyStyle = WebMessageBodyStyle.Bare, UriTemplate = "/PostImage",Method ="POST")]

 PublicMessage PostImage(Upload obj);

[DataContract]
    public class Upload
    {
        [DataMember]
        public Stream File { get; set; }
    }

服务定义：

public PublicMessage PostImage(Upload obj)
    {
        byte[] buffer = StreamToByte(obj.File);   //Function to convert the stream to byte array
     FileStream fs = new FileStream(@"D:\ShopMonkeyApp\Desert.jpg", FileMode.Create, FileAccess.ReadWrite);
        BinaryWriter bw = new BinaryWriter(fs);

        bw.Write(buffer);

        bw.Close();

        return new PublicMessage { Message = "Recieved the image on server" };
    }

客户端应用：

string filePath = @"D:\ShopMonkeyApp\Desert.jpg";

        string url = "http://localhost:50268/shopmonkey.svc/PostImage/"; // Service Hosted in IIS

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

        request.Accept = "text/xml";

        request.Method = "POST";

        request.ContentType = "image/jpeg";

        using (Stream fileStream = File.OpenRead(filePath))

        using (Stream requestStream = request.GetRequestStream())
        {

            int bufferSize = 1024;

            byte[] buffer = new byte[bufferSize];

            int byteCount = 0;

            while ((byteCount = fileStream.Read(buffer, 0, bufferSize)) > 0)
            {

                requestStream.Write(buffer, 0, byteCount);

            }

        }

        string result;

        using (WebResponse response = request.GetResponse())

        using (StreamReader reader = new StreamReader(response.GetResponseStream()))
        {

            result = reader.ReadToEnd();

        }

        Console.WriteLine(result);

网络配置：

 <system.serviceModel>
        <services>
      <service name="ShopMonkey.ShopMonkey" behaviorConfiguration="ServiceBehaviour">
        <!-- Service Endpoints -->
        <!-- Unless fully qualified, address is relative to base address supplied above -->
        <endpoint address ="" binding="webHttpBinding" contract="ShopMonkey.IShopMonkey" behaviorConfiguration="web">
          <!-- 
              Upon deployment, the following identity element should be removed or replaced to reflect the 
              identity under which the deployed service runs.  If removed, WCF will infer an appropriate identity 
              automatically.behaviorConfiguration="web"
          -->
        </endpoint>
      </service>
    </services>

    <behaviors>
      <serviceBehaviors>
        <behavior name="ServiceBehaviour">
          <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
          <serviceMetadata httpGetEnabled="true"/>
          <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
      <endpointBehaviors>
        <behavior name="web">
          <webHttp/>
          <dataContractSerializer maxItemsInObjectGraph="10000000"/>
        </behavior>
      </endpointBehaviors>
    </behaviors>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
  </system.serviceModel>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>

谢谢

维杰

4

2 回答 2

1

增加 web.config 中的消息队列长度可以解决我的问题。

<webHttpBinding>
        <binding name="streamWebHttpbinding" transferMode="Streamed"  maxReceivedMessageSize="1000000000000" receiveTimeout="01:00:00" sendTimeout="01:00:00" />
      </webHttpBinding>

谢谢大家

于 2012-08-03T07:46:23.800 回答
0

如果您在 Upload 类上没有任何其他属性，则将 WCF 服务方法更改为具有 Stream 参数，而不是将其包装在一个类中，如下所示：

[OperationContract]
[WebInvoke(UriTemplate = "/PostImage",Method ="POST")]
PublicMessage PostImage(Stream obj);

然后就可以使用WebClient类直接上传文件了，如下图：

var c = new System.Net.WebClient();
c.OpenWrite(string.Concat("http://localhost:50268/shopmonkey.svc", "/PostImage"), "POST");
c.Headers[HttpRequestHeader.ContentType] = "image/jpeg";            
return c.UploadFile(string.Concat(serviceBaseUrl, resourceUrl), filePath);

另请参阅此链接。

更新：

请在下面找到示例以使您的代码正常工作：

[OperationContract]
[WebInvoke(UriTemplate = "/PostImage",Method ="POST")]
PublicMessage PostImage(Upload obj);

[DataContract]
public class Upload
{
    [DataMember]
    public MemoryStream FileContent { get; set; }
}

现在实现 PostImage 的方法如下所示：

public PublicMessage PostImage(Upload obj)
{
        byte[] buffer = new byte[obj.FileContent.Length];
        using (FileStream ms = new FileStream(@"D:\ShopMonkeyApp\Temp\Desert.jpg", FileMode.OpenOrCreate))
        {
            obj.FileContent.Position = 0;
            int read = fileInfo.Content.Read(buffer, 0, buffer.Length);
            ms.Write(buffer, 0, read);
        }

    return new PublicMessage { Message = "Recieved the image on server" };
}

现在，由于我们的服务器端代码已经完成，现在移动到将文件上传到服务器的客户端部分，如下所示：

    private string ClientSample()
    {
            var uploadObject = new Upload();
            Image image = Image.FromFile(@"D:\ShopMonkeyApp\Desert.jpg");
            MemoryStream ms = new MemoryStream();
            uploadObject.FileContent = new MemoryStream();
            image.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
            ms.WriteTo(uploadObject.FileContent);
            ms.Close();

        string responseMessage = null;            
        var request = WebRequest.Create(http://localhost:50268/shopmonkey.svc/PostImage) as HttpWebRequest;
        if (request != null)
        {
            request.ContentType = "application/xml";
            request.Method = method;
        }

        if(method == "POST" && requestBody != null)
        {
            byte[] requestBodyBytes;
            requestBodyBytes = ToByteArrayUsingDataContractSer<Upload>(requestBody);
            request.ContentLength = requestBodyBytes.Length;
            using (Stream postStream = request.GetRequestStream())
                postStream.Write(requestBodyBytes, 0, requestBodyBytes.Length);                    
        }

        if (request != null)
        {
            var response = request.GetResponse() as HttpWebResponse;
            if(response.StatusCode == HttpStatusCode.OK)
            {
                Stream responseStream = response.GetResponseStream();
                if (responseStream != null)
                {
                    var reader = new StreamReader(responseStream);

                    responseMessage = reader.ReadToEnd();                        
                }
            }
            else
            {   
                responseMessage = response.StatusDescription;
            }
        }
    }

    private static byte[] ToByteArrayUsingDataContractSer<T>(T requestBody)
    {
        byte[] bytes = null;
        var serializer1 = new DataContractSerializer(typeof(T));            
        var ms1 = new MemoryStream();            
        serializer1.WriteObject(ms1, requestBody);
        ms1.Position = 0;
        var reader = new StreamReader(ms1);
        bytes = ms1.ToArray();
        return bytes;            
    }

注意：确保客户端和服务器上的 Upload 对象定义了相同的命名空间和属性，以避免任何反序列化问题。

于 2012-07-16T16:34:07.667 回答