我认为这是一个简单的问题，其他人也许能够提供缺失的链接。我有一个 Workflow wcf 服务，我的 .NET 客户端可以与之正确通信。我已经在 appfabric 下打开跟踪并且可以看到服务调用正确执行，所以我觉得服务不是问题。我的 Android 调用从未到达第一个跟踪点。

在使用 ksoap2 (2.6.5) 的 Android 中，当我调用此行时，我得到一个 Object reference not set 错误:

SoapObject response = (SoapObject)envelope.getResponse();

对我来说，这看起来很简单，信封必须为空，当我们尝试访问它以执行 getResponse 时，我们遇到了错误，但在调试器中它显示为有效对象。此外，我找不到文档来解释，我看到的每个教程都是这样......？

有一点不同的是，在 .NET 中我会创建一个对象传递对象，让 .NET 为我序列化它。在这里，我添加了几个参数，它们都是字符串，但我将显示枚举，因为它可能是罪魁祸首。这是我的完整 Java 实现:

String NAMESPACE = "http://tempuri.org/";
String METHOD_NAME = "LiftDataExchange";
String SOAP_ACTION = "http://tempuri.org/ILiftDataExchange/ProcessDataRequest";
String URL = "http://www.icyarmtesting.com/LiftDataExchange.xamlx";
String SOAP_REMOTE_NAMESPACE = "http://schemas.datacontract.org/2004/07/IronMikeDataExchangeWorkflowService.Enum";

String X = "";
ExchangeEnumerations ExrcsEnum = ExchangeEnumerations.GetNextWorkout;

//Initialize soap request
SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);

//add parameters
PropertyInfo piAct = new PropertyInfo();
piAct.setName("Action");
piAct.setValue(ExrcsEnum);
piAct.setType(ExchangeEnumerations.class);
request.addProperty(piAct);

//Declare the version of the SOAP request
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.addMapping(SOAP_REMOTE_NAMESPACE, "ExchangeEnumerations", ExchangeEnumerations.class, ExchangeEnumerationsEnumClass.getInstance());
envelope.dotNet = true;
envelope.setOutputSoapObject(request);

//Needed to make the internet call
HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
androidHttpTransport.debug = true;
try 
    {          
  //this is the actual part that will call the webservice
  androidHttpTransport.call(SOAP_ACTION, envelope); 
  SoapObject response = (SoapObject)envelope.getResponse();
  X = response.getProperty(0).toString();
}
catch (Exception e)...... 

这是我的请求转储:

<v:Envelope xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns:d="http://www.w3.org/2001/XMLSchema" xmlns:c="http://schemas.xmlsoap.org/soap/encoding/" xmlns:v="http://schemas.xmlsoap.org/soap/envelope/">
    <v:Header />
    <v:Body>
        <LiftDataExchange xmlns="http://tempuri.org/" id="o0" c:root="1">
            <UserName i:type="d:string">STERILIZED_OUT</UserName>
            <Password i:type="d:string">STERILIZED_OUT</Password>
            <ExerciseProgramID i:type="d:string">STERILIZED_OUT</ExerciseProgramID>
            <IncomingWorkoutData i:type="d:string">STERILIZED_OUT</IncomingWorkoutData>
            <Action i:type="n0:ExchangeEnumerations" xmlns:n0="http://schemas.datacontract.org/2004/07/IronMikeDataExchangeWorkflowService.Enum">GetNextWorkout</Action>
        </LiftDataExchange>
    </v:Body>
</v:Envelope>

这是我的响应转储:

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
    <s:Body>
        <s:Fault>
            <faultcode xmlns:a="http://schemas.microsoft.com/net/2005/12/windowscommunicationfoundation/dispatcher">a:InternalServiceFault</faultcode>
            <faultstring xml:lang="en-US">Object reference not set to an instance of an object.</faultstring>
            <detail>
                <ExceptionDetail xmlns="http://schemas.datacontract.org/2004/07/System.ServiceModel" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
                <HelpLink i:nil="true"/>
                <InnerException i:nil="true"/>
                <Message>Object reference not set to an instance of an object.</Message>                
                <StackTrace>   at System.ServiceModel.Activities.WorkflowOperationContext.HandleEndResumeBookmark(IAsyncResult result)&#xD; at System.ServiceModel.Activities.WorkflowOperationContext.OnResumeBookmark()&#xD; at System.ServiceModel.Activities.WorkflowOperationContext..ctor(Object[] inputs, OperationContext operationContext, String operationName, Boolean performanceCountersEnabled, Boolean propagateActivity, Transaction currentTransaction, WorkflowServiceInstance workflowInstance, IInvokeReceivedNotification notification, WorkflowOperationBehavior behavior, ServiceEndpoint endpoint, TimeSpan timeout, AsyncCallback callback, Object state)&#xD; at System.ServiceModel.Activities.Description.WorkflowOperationBehavior.WorkflowOperationInvoker.OnBeginServiceOperation(WorkflowServiceInstance workflowInstance, OperationContext operationContext, Object[] inputs, Transaction currentTransaction, IInvokeReceivedNotification notification, TimeSpan timeout, AsyncCallback callback, Object state)&#xD; at System.ServiceModel.Activities.Dispatcher.ControlOperationInvoker.ControlOperationAsyncResult.PerformOperation()&#xD; at System.ServiceModel.Activities.Dispatcher.ControlOperationInvoker.ControlOperationAsyncResult.HandleEndGetInstance(IAsyncResult result)&#xD; at System.ServiceModel.Activities.Dispatcher.ControlOperationInvoker.ControlOperationAsyncResult.Process()&#xD; at System.ServiceModel.Activities.Dispatcher.ControlOperationInvoker.ControlOperationAsyncResult..ctor(ControlOperationInvoker invoker, Object[] inputs, IInvokeReceivedNotification notification, TimeSpan timeout, AsyncCallback callback, Object state)&#xD; at System.ServiceModel.Activities.Dispatcher.ControlOperationInvoker.InvokeBegin(Object instance, Object[] inputs, IInvokeReceivedNotification notification, AsyncCallback callback, Object state)&#xD; at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc&amp; rpc)&#xD; at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc&amp; rpc)&#xD; at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc&amp; rpc)&#xD; at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)</StackTrace><Type>System.NullReferenceException</Type></ExceptionDetail></detail></s:Fault></s:Body></s:Envelope>

更新:

切换到 Edwin 的方法调用具有相同的结果。所以我从 KSoap2 2.6.5 升级到 3.0.0-RC4，现在我得到一个 NullRefException。使用以前的版本我会点击服务并抛出对象未设置错误。使用此版本，我不会点击服务并抛出 NullRef。代码是一样的，唯一不同的是我使用的是哪个版本的 KSoap。我编写了一个简单的服务(记住这些是工作流服务)，它接收一个字符串，对其进行更改，然后踢出一个字符串。

FWIW 这是我调用电话的代码:

String SOAP_ACTION = "http://tempuri.org/";
    String OPERATION_NAME="ChangeName";
    final String WSDL_TARGET_NAMESPACE = SOAP_ACTION;
    final String SOAP_ADDRESS= "http://www.icyarmtesting.com/ServiceTest/Service1.xamlx";
    Exception exception;
    String ErrorMsg="";
    String TEST_URL="" ;

    SoapObject request = new SoapObject(WSDL_TARGET_NAMESPACE, OPERATION_NAME);

    //PropertyInfo piName = new PropertyInfo();
    //piName.setName("UserName");
    //piName.setValue("ramjet");
    //piName.setType(String.class);
    //request.addProperty(piName);
    request.addProperty("UserName", "ramjet");

    SoapSerializationEnvelope  envelope = new SoapSerializationEnvelope(SoapEnvelope.VER12);
    envelope.dotNet= true;
    envelope.setOutputSoapObject(request);

    HttpTransportSE httpTransport =null;
    if(!TEST_URL.equals(""))
        httpTransport = new HttpTransportSE(TEST_URL);
    else
        httpTransport = new HttpTransportSE(SOAP_ADDRESS);



    Object Response =null;
     try
     {
        httpTransport.call(SOAP_ACTION + "IService/" + OPERATION_NAME, envelope);
        Response = envelope.getResponse();
      }
     catch (SocketTimeoutException ex) 
     {
         ErrorMsg="Unable to connect";
          Response=null;
         exception=ex;
      }
      catch (IOException ie) 
      {
       ErrorMsg="Unable to connect";
      Response=null;
       exception=ie;
      }
       catch (Exception e) 
       {
        ErrorMsg="Unable to connect";
        Response=null;
        exception=e;
     }

最佳答案

更改以下内容:

SoapObject response = (SoapObject)envelope.getResponse();
  X = response.getProperty(0).toString();

成为:

SoapObject response = (SoapObject)envelope.bodyIn;
                if(response != null)
                {
                      X=response.getProperty(0).toString();
                }

关于android - KSoap2 SoapObject 对象引用未设置为实例，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14526892/