Objective c 对web服务使用wcf框架时发生xml分析错误

这是iam第一次为iOS应用程序处理WCFSOAP服务时，em在尝试使用post方法将xml发送到服务器时遇到问题。我的iOS端代码如下所示

NSString *soapMessage = [NSString stringWithFormat:@"<SOAP-ENV:Envelope xmlns:SOAP-ENV=\"http://schemas.xmlsoap.org/soap/envelope/\"><SOAP-ENV:Body><SaveAllRecords33><xmlData></xmlData></SaveAllRecords33></SOAP-ENV:Body></SOAP-ENV:Envelope>"];

NSURL *url = [NSURL URLWithString:@"http://webservice.net2survey.com/servicejson.svc/SaveAllRecord33"];
NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];                        
NSString *msgLength = [NSString stringWithFormat:@"%d", [soapMessage length]];             

[theRequest addValue: @"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
[theRequest addValue: @"urn:ServiceJSON/SaveAllRecords33" forHTTPHeaderField:@"SOAPAction"];
[theRequest addValue: msgLength forHTTPHeaderField:@"Content-Length"];
[theRequest setHTTPMethod:@"POST"];    
[theRequest setHTTPBody: [soapMessage dataUsingEncoding:NSUTF8StringEncoding]];

NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];

当aim点击这个url时，它会显示一些错误，如下所示

<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">Root element is missing.</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>Root element is missing.</Message><StackTrace>   at System.Xml.XmlTextReaderImpl.ThrowWithoutLineInfo(String res)&#xD;
   at System.Xml.XmlTextReaderImpl.ParseDocumentContent()&#xD;
   at System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace)&#xD;
   at System.Xml.XmlDocument.Load(XmlReader reader)&#xD;
   at System.Xml.XmlDocument.LoadXml(String xml)&#xD;
   at WcfService.ServiceJSON.SaveAllRecords33(String xmlData)&#xD;
   at SyncInvokeSaveAllRecords33(Object , Object[] , Object[] )&#xD;
   at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]&amp; outputs)&#xD;
   at System.S
2012-09-25 17:50:00.846 Net2Survey_demo[1576:b903] str: erviceModel.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.Xml.XmlException</Type></ExceptionDetail></detail></s:Fault></s:Body></s:Envelope>

a:InternalServiceFaultRoot元素缺失。根元素缺失。在System.Xml.XmlTextReaderImpl.ThrowWithoutLineInfo（字符串res）和xD；
在System.Xml.XmlTextReaderImpl.ParseDocumentContent（）和#xD；
在System.Xml.xmloader.Load（XmlDocument doc、XmlReader reader、Boolean preserve whitespace）和#xD；
加载（XmlReader）和xD；
在System.Xml.XmlDocument.LoadXml（字符串Xml）和#xD；
在WcfService.ServiceJSON.SaveAllRecords33（字符串xmlData）和xD；
在SyncInvokeSavallRecords33（对象，对象[]，对象[]）和#xD；
在System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke（对象实例、对象[]输入、对象[]输出）和#xD；
在System.S
2012-09-25 17:50:00.846 Net2Survey_demo[1576:b903]str:servicecmodel.Dispatcher.dispatcheoperationruntime.InvokeBegin（MessageRpc&；rpc）和xD；
在System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5（MessageRpc&；rpc）和#xD；
在System.ServiceModel.Dispatcher.ImmutableDispatcheRuntime.ProcessMessage31（MessageRpc&；rpc）和#xD；
位于System.ServiceModel.Dispatcher.MessageRpc.Process（Boolean isOperationContextSet）System.Xml.XmlException

我像这样调用了这种类型的WCF Web服务尝试调用可能对您有所帮助..）

-（void）视图将出现
{
NSString*soapMsg=[NSString stringWithFormat:@]
"%@"
"%@"
"%@"
""
“”，txtToPostalCode.text，txtFrmPostalCode.text，txtWeight.text]；
NSURL*url=[NSURL URLWithString:@http://webservice.net2survey.com/servicejson.svc/basic"];
NSMutableURLRequest*req=[NSMutableUrlRequestWithURL:url]；
NSString*msgLength=[NSString stringWithFormat:@“%d”，[soapMsg长度]]；
[req addValue:@“应用程序/xml；字符集=utf-8”用于HttpHeaderField:@“内容类型”]；
[请求添加值：@”http://webservice.net2survey.com/servicejson.svc/basicforHTTPHeaderField:@“SOAPAction”]；
[req addValue:msgLength for HttpHeaderField:@“内容长度”]；
[req setHTTPMethod:@“POST”]；
[req setHTTPBody:[soapMsg dataUsingEncoding:NSUTF8StringEncoding]]；
conn=[[NSURLConnection alloc]initWithRequest:req委托：self]；
如果（康涅狄格州）{
webData=[[NSMutableData]保留]；
}
objAppDelegate.arrglbpostatesing=[[NSMutableArray alloc]init]；
}

服务本身工作正常，问题不在WCF中。如果在堆栈跟踪中向右滚动，您将看到它显示缺少

根元素。

并且在服务中创建XmlDocument时失败

您只是发送了一个无效的Xml字符串，它无法解析。

Uhh，当然。

valuevalue

<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">Root element is missing.</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>Root element is missing.</Message><StackTrace>   at System.Xml.XmlTextReaderImpl.ThrowWithoutLineInfo(String res)&#xD;
   at System.Xml.XmlTextReaderImpl.ParseDocumentContent()&#xD;
   at System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace)&#xD;
   at System.Xml.XmlDocument.Load(XmlReader reader)&#xD;
   at System.Xml.XmlDocument.LoadXml(String xml)&#xD;
   at WcfService.ServiceJSON.SaveAllRecords33(String xmlData)&#xD;
   at SyncInvokeSaveAllRecords33(Object , Object[] , Object[] )&#xD;
   at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]&amp; outputs)&#xD;
   at System.S
2012-09-25 17:50:00.846 Net2Survey_demo[1576:b903] str: erviceModel.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.Xml.XmlException</Type></ExceptionDetail></detail></s:Fault></s:Body></s:Envelope>

 -(void)ViewWillAppear
 {

 NSString *soapMsg = [NSString stringWithFormat:@"<SOAP-ENV:Envelope xmlns:SOAP-ENV=\"http://schemas.xmlsoap.org/soap/envelope\">"
                                 "<ToPostalCode>%@</ToPostalCode>"
                                 "<FromPostalCode>%@</FromPostalCode>"
                                 "<Weight>%@</Weight>"
                                 "<DeliveryServiceName></DeliveryServiceName>"
                                 "</SingaporePostalInfoDetailsRequest>",txtToPostalCode.text,txtFrmPostalCode.text,txtWeight.text];

            NSURL *url = [NSURL URLWithString: @http://webservice.net2survey.com/servicejson.svc/basic"];
            NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url];

            NSString *msgLength = [NSString stringWithFormat:@"%d", [soapMsg length]];
            [req addValue:@"application/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
            [req addValue:@"http://webservice.net2survey.com/servicejson.svc/basic" forHTTPHeaderField:@"SOAPAction"];
            [req addValue:msgLength forHTTPHeaderField:@"Content-Length"];
            [req setHTTPMethod:@"POST"];
            [req setHTTPBody: [soapMsg dataUsingEncoding:NSUTF8StringEncoding]];

            conn = [[NSURLConnection alloc] initWithRequest:req delegate:self];
            if (conn) {
                webData = [[NSMutableData data] retain];
            }

            objAppDelegate.arrGlbPostageSing = [[NSMutableArray alloc]init];


 }