我的第一个问题是温和的=) 以下是VS2010中的.Net 4,VB.Net.最终目标是通过Tcp绑定从客户端接收(完整)流到IIS托管WCF服务.我面临的问题是该服务无法从提供的流中读取任何字节.现在有了细节
以下是VS2010中的.Net 4,VB.Net.最终目标是通过Tcp绑定从客户端接收(完整)流到IIS托管WCF服务.我面临的问题是该服务无法从提供的流中读取任何字节.现在有了细节……为了简洁,我已经删除了相当数量但是,如果我省略了一些重要的东西,请告诉我.
服务合同如下：
<ServiceContract(Namespace:="ImageSystem")> _
Public Interface IUploadService
<OperationContract()> _
Function UploadFile(ByVal file As ImageUpload) As ImageUpload
End Interface
数据协定ImageUpload如下：
<MessageContract()> _
Public Class ImageUpload
#Region " Message Header "
Private _ImageID As Nullable(Of Long)
<MessageHeader()> _
Public Property ImageID() As Nullable(Of Long)
Get
Return _ImageID
End Get
Set(ByVal value As Nullable(Of Long))
_ImageID = value
End Set
End Property
'... a few other value type properties
#End Region
#Region " Message Body"
' Do not add any more members to the message body or streaming support will be disabled!
<MessageBodyMember()> _
Public Data As System.IO.Stream
#End Region
End Class
相关的服务器配置/绑定如下(这些显然只是dev环境设置)：
<system.serviceModel>
<bindings>
<netTcpBinding>
<binding name="netTcpStreamBinding" transferMode="Streamed" maxBufferSize="20971520" maxReceivedMessageSize="20971520"/>
</netTcpBinding>
</bindings>
<services>
<service behaviorConfiguration="UploadServiceBehaviour"
name="ImageSystem.SVC.UploadService">
<endpoint address="" binding="netTcpBinding" bindingConfiguration="netTcpStreamBinding"
contract="ImageSystem.SVC.IUploadService">
<identity>
<dns value="localhost" />
</identity>
</endpoint>
<endpoint address="mex" binding="mexTcpBinding" contract="IMetadataExchange" />
<host>
<baseAddresses>
<add baseAddress="net.tcp://localhost:809/UploadService" />
</baseAddresses>
</host>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="UploadServiceBehaviour">
<serviceMetadata httpGetEnabled="false"/>
<serviceDebug includeExceptionDetailInFaults="true"/>
</behavior>
</serviceBehaviors>
</behaviors>
</system.serviceModel>
WCF服务是一个服务库,由Web应用程序托管. Web应用程序项目在我的本地IIS 7.5中运行. IIS已配置为启用TCP连接,并且应用程序池标识配置了对合同实现的相关权限. VS2010以管理员身份运行,以便在IIS中启用调试.
为了测试合同实现,我将Windows控制台应用程序设置为(测试)客户端.通过在IIS主机(http：//localhost/ImageSystem/UploadService.svc)中向服务添加服务引用来生成客户端代理类.服务引用配置为生成异步方法.
相关的自动生成的客户端配置如下(注意,我已尝试增加maxBufferPoolSize,maxBufferSize和maxReceivedMessageSize以匹配“20971520”的服务器配置,但无济于事)：
[编辑：reliableSessions部分根据Sixto Saez的建议评论但无济于事]
<system.serviceModel>
<bindings>
<binding name="NetTcpBinding_IUploadService" closeTimeout="00:01:00"
openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
transactionFlow="false" transferMode="Streamed" transactionProtocol="OleTransactions"
hostNameComparisonMode="StrongWildcard" listenBacklog="10" maxBufferPoolSize="20971520"
maxBufferSize="20971520" maxConnections="10" maxReceivedMessageSize="20971520">
<readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
maxBytesPerRead="4096" maxNameTableCharCount="16384" />
<!--<reliableSession ordered="true" inactivityTimeout="00:10:00"
enabled="false" />-->
<security mode="None">
<transport clientCredentialType="Windows" protectionLevel="EncryptAndSign" />
<message clientCredentialType="Windows" />
</security>
</binding>
</netTcpBinding>
</bindings>
<client>
<endpoint address="net.tcp://mycomputername.mydomain/ImageSystem/UploadService.svc"
binding="netTcpBinding" bindingConfiguration="NetTcpBinding_IUploadService"
contract="UploadService.Local.IUploadService" name="NetTcpBinding_IUploadService">
<identity>
<dns value="localhost" />
</identity>
</endpoint>
</client>
</system.serviceModel>
客户端使用情况如下：
Public Sub Test()
Dim serviceClient As UploadService.Local.UploadServiceClient = New UploadService.Local.UploadServiceClient
AddHandler serviceClient.UploadFileCompleted, AddressOf LocalTestCallback
Dim ms As MemoryStream = New MemoryStream
My.Resources.Penguins.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg)
serviceClient.ClientCredentials.Windows.ClientCredential.Domain = "MYDOMAIN"
serviceClient.ClientCredentials.Windows.ClientCredential.UserName = "User"
serviceClient.ClientCredentials.Windows.ClientCredential.Domain = "Password123"
serviceClient.UploadFileAsync(Nothing, ..., ms, ms) '"..." is obviously not actually here, other values omitted. "ms" is passed as UserState object in addition to fulfilling the 'Data' parameter
End Sub
如果您想知道(或重要),企鹅图像是样本图片目录中随Windows 7提供的图像.图像为777,835字节(应在相关请求/缓冲区最大大小内).
我尝试了两种方法来在服务器端读取图像.
方法1：
Public Function UploadFile(ByVal file As ImageUpload) As ImageUpload Implements IUploadService.UploadFile
Dim uploadBuffer(Helper.Settings.AppSettings(Of Integer)("UploadBufferSize", True) - 1) As Byte
Dim ms As MemoryStream = New MemoryStream()
Dim bytesRead As Integer
Do
bytesRead = file.Data.Read(uploadBuffer, 0, uploadBuffer.Length)
ms.Write(uploadBuffer, 0, bytesRead)
Loop Until bytesRead = 0
End Function
方法2：
Public Function UploadFile(ByVal file As ImageUpload) As ImageUpload Implements IUploadService.UploadFile
Dim reader As StreamReader = New StreamReader(file.Data)
Dim imageB64 As String = reader.ReadToEnd
ms = New MemoryStream(Convert.FromBase64String(imageB64))
End Function
在两种情况下,ms.Length = 0.更明显,在第二种方法中,imageB64 =“”(空字符串).
为什么我从流中收到任何东西？另外,作为一个偷偷摸摸的子问题,为什么生成的代理类不提供接受ImageUpload类型对象的重载？
先感谢您！！
我觉得你会遇到你提到的问题似乎很奇怪,所以我很好奇并使用你的服务合同整理了一个实现.那个实际上是直接工作的.我实际上并不知道你的情况出了什么问题(这不是很明显),但是让我在这里发布一个有效的解决方案,希望这能帮助你解决问题.不幸的是,由于我多年前放弃了VB,我只能提供C#代码.希望没关系.
Server Web.config(在IIS中测试,使用net.tcp绑定)：
<system.serviceModel>
<bindings>
<netTcpBinding>
<binding transferMode="Streamed" maxReceivedMessageSize="1000000">
<security mode="None"/>
</binding>
</netTcpBinding>
</bindings>
<services>
<service name="ImageSystem.SVC.UploadService">
<endpoint address="" binding="netTcpBinding" contract="ImageSystem.SVC.IUploadService">
</endpoint>
<endpoint address="mex" kind="mexEndpoint" binding="mexTcpBinding"/>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior>
<serviceMetadata httpGetEnabled="false"/>
<serviceDebug includeExceptionDetailInFaults="true"/>
</behavior>
</serviceBehaviors>
</behaviors>
</system.serviceModel>
客户端app.config(控制台测试应用程序)：
<system.serviceModel>
<bindings>
<netTcpBinding>
<binding transferMode="Streamed" maxReceivedMessageSize="1000000">
<security mode="None"/>
</binding>
</netTcpBinding>
</bindings>
<client>
<endpoint
address="net.tcp://localhost/WcfService1/UploadService.svc"
binding="netTcpBinding"
contract="ImageServices.IUploadService"
name="NetTcpBinding_IUploadService">
</endpoint>
</client>
</system.serviceModel>
服务合同&执行：
[ServiceContract(Namespace="urn:ImageSystem")]
public interface IUploadService
{
[OperationContract]
ImageUpload UploadFile(ImageUpload file);
}
[MessageContract]
public class ImageUpload
{
[MessageHeader]
public long? ImageID { get; set; }
[MessageBodyMember]
public Stream Data;
}
public class UploadService : IUploadService
{
public ImageUpload UploadFile(ImageUpload file)
{
long length;
using (var ms = new MemoryStream())
{
file.Data.CopyTo(ms);
length = ms.Length;
}
return new ImageUpload { ImageID = length, Data = new MemoryStream() };
}
}
测试应用：
private static readonly string imgPath = @"C:\Pictures\somepicture.jpg";
private static readonly EventWaitHandle waitHandle = new AutoResetEvent(false);
static void Main()
{
long? result;
using (var service = new ImageServices.UploadServiceClient("NetTcpBinding_IUploadService"))
{
var image = new ImageServices.ImageUpload();
using (var imgStream = File.OpenRead(imgPath))
{
image.Data = imgStream;
service.UploadFileCompleted += (sender, e) =>
{
result = e.Result;
if (e.Data != null) image.Data.Dispose();
waitHandle.Set();
};
service.UploadFileAsync(null, imgStream);
waitHandle.WaitOne();
}
}
}
首先,正如您所看到的,配置文件可以更简单.特别是大型BufferSize值不是必需的.然后,关于服务合同,我不清楚为什么上传操作会收到AND返回一个ImageUpload消息.在我的实现中,我在ImageID参数中返回上传的文件大小,当然只是为了演示目的.我不知道你的合同背后的原因是什么,以及你真正想要回归的是什么.
实际上,当我知道你的代码为什么会失败时,就要点击“发送”.在测试客户端中,在调用serviceClient.UploadFileAsync()之前,将此行添加到代码中：ms.Seek(0,SeekOrigin.Begin).
这会将MemoryStream的位置重置回其开头.如果你不这样做,MemoryStream将仅从其当前位置消耗,这是它的结束 – 这解释了服务端收到的流的长度= 0！