我用VC(ATL)实现OPC XML DA， __interface ISimpleSoapAppService { [id(1)] HRESULT GetStatus([in] BSTR LocaleID, [in] BSTR ClientRequestHandle, [out] ServerStatus* Status, [out,retval] ReplyBase* GetStatusResult); }; [ soap_method ] HRESULT GetStatus(/*[in]*/ BSTR LocaleID, /*[in]*/ BSTR ClientRequestHandle, /*[out]*/ ServerStatus* Status, /*[out,retval]*/ ReplyBase* GetStatusResult) { ．．．．．． return S_OK; } 但是我发现OPC XML的规范好像不是标准的SOAP规范，我看过的许多SOAP都没有属性的概念．如下： <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" > <soap:Body> <GetStatus LocaleID="de-AT" xmlns="http://opcfoundation.org/webservices/XMLDA/1.0/" /> </soap:Body> </soap:Envelope> 其中LocaleID是以XML节点属性的方式出现，这样的话我以上VC设计中的接口永远无法得到LocaleID的值，如果改成这样就可以 <?xml version="1.0" encoding="utf-8"?> <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" > <soap:Body> <GetStatus xmlns="http://opcfoundation.org/webservices/XMLDA/1.0/" > <LocaleID>de-AT</LocaleID> <／GetStatus＞ </soap:Body> </soap:Envelope> 还有，按OPC XML的例子中，其返回的XML如下： <GetStatusResult RcvTime="2003-05-26T20:17:42.4781250-07:00" ReplyTime="2003-05-26T20:17:42.5781250-07:00" RevisedLocaleID="de" ServerState="running" /> 可是我的程序返回的却是： <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"> <soap:Body soap:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"> <snp:GetStatus xmlns:snp="urn:SimpleSoapAppService"> <GetStatusResult> <RcvTime>38406.732187499998</RcvTime> <ReplyTime>38406.732187499998</ReplyTime> <ClientRequestHandle>ClientRequestHandle Demo</ClientRequestHandle> <RevisedLocaleID>RevisedLocaleID Demo</RevisedLocaleID> <ServerState>running</ServerState> </GetStatusResult> <Status> <StatusInfo>StatusInfo Demo</StatusInfo> <VendorInfo>VendorInfo</VendorInfo> <SupportedLocaleIDs>SupportedLocaleIDs</SupportedLocaleIDs> <SupportedInterfaceVersions>XML_DA_Version_1_0</SupportedInterfaceVersions> <StartTime>38406.732187499998</StartTime> <ProductVersion>ProductVersion Demo</ProductVersion> </Status> </snp:GetStatus> 她就说例子中有此是作为节点属性出现，有些是作为节点文本出现，可我的返回值却全部是作为节点文本． 我是这样定义ServerStatus的 struct ServerStatus { BSTR StatusInfo; BSTR VendorInfo; BSTR SupportedLocaleIDs; interfaceVersion SupportedInterfaceVersions; DATE StartTime; BSTR ProductVersion; } 请问我错在哪里，该如何改！请高手指点一二．