SoapClientBase ,A Good Class provide a mean to WebServices

#pragma once

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/****************************************************************************************************

Soap client helper class for C++

Usage:

?????? 1. Inherit a class from this base class

?????? 2. Call Init in constructor,like this:

????????????? Init("http://localhost/AuthService/AuthService.asmx?wsdl","AuthService","");

?????? 3. Wrap the webservice by writing proxy function for each web method

?????? 4. Call Invoke to execute the function,processing the input params and return value

????????????? be careful,the order of parameters should be reversed in the parameter array while callin Invoke

?????? 5. Then use this class to call webservice,like this:

????????????? AuthServiceClient?????? service;

????????????? bool ret = service.IsAuthorized(strCode);

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*******************************************************************************************************/

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//import soapsdk

//modify the path if needed

#import "C:/Program Files/Common Files/MSSoap/Binaries/mssoap30.dll" /

?????? exclude("IStream","IErrorInfo","ISequentialStream","_LARGE_INTEGER",/

?????? "_ULARGE_INTEGER","tagSTATSTG","_FILETIME")

using namespace MSSOAPLib30;

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///////////////////////////////////////////////////////////////////////////////////////

// Base class for calling a webservice using soap

class SoapClientBase

{

protected:

?????? ISoapClient?? *m_pSoapClient;

?????? char*???????????? m_pError;

?????? HRESULT??????????? m_hr;

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public:

?????? SoapClientBase(void)

?????? {

????????????? m_pSoapClient = NULL;

????????????? m_pError = NULL;

????????????? m_hr = 0;

?????? }

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?????? virtual ~SoapClientBase(void)

?????? {

????????????? Reset();

?????? }

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?????? ///////////////////////////////////////////////////////////////////

?????? // Check error message issued by last call(if any)

?????? char* GetLastError()

?????? {

????????????? return m_pError;

?????? }

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?????? ////////////////////////////////////////////////////////////////

?????? // Init SoapClient object

?????? bool Init(char* szWSDLFile,char* szService,char* szPort)

?????? {

????????????? Reset();

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????????????? //create soapclient object

????????????? m_hr = ::CoCreateInstance(__uuidof(SoapClient30),NULL,CLSCTX_INPROC_SERVER,__uuidof(ISoapClient),(LPVOID *)&m_pSoapClient);

????????????? if (m_pSoapClient==NULL)

????????????? {

???????????????????? IssueError("Create soap client object fail");

???????????????????? return false;

????????????? }

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????????????? //init soap client

????????????? _variant_t???? varWSDL????? = szWSDLFile;

????????????? _variant_t???? varWSML = "";

????????????? _bstr_t bstrService???? = szService;

????????????? _bstr_t bstrPort??? = szPort;

????????????? _bstr_t bstrNS???????????? = "";

????????????? m_hr = m_pSoapClient->MSSoapInit2(varWSDL,varWSML,bstrService,bstrPort,bstrNS);

????????????? if (FAILED(m_hr))

????????????? {

???????????????????? IssueError("Error calling MSSoapInit2");

???????????????????? return false;

????????????? }

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????????????? return true;

?????? }

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protected:

?????? ///////////////////////////////////////////////////////////////////

?????? // Record an error message issued by this class or inherited

?????? void IssueError(char* szError)

?????? {

????????????? if (m_pError)

???????????????????? delete [] m_pError;

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????????????? m_pError = new char[strlen(szError)+1];

????????????? strcpy(m_pError,szError);

?????? }

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?????? ////////////////////////////////////////////////////////////////////

?????? // Release interface,free memory,clean everything

?????? void Reset()

?????? {

????????????? if (m_pSoapClient)

????????????? {

???????????????????? m_pSoapClient->Release();

???????????????????? m_pSoapClient = NULL;

????????????? }

????????????? if (m_pError)

????????????? {

???????????????????? delete [] m_pError;

???????????????????? m_pError = NULL;

????????????? }

????????????? m_hr = S_OK;

?????? }

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protected:

?????? /////////////////////////////////////////////////////////////////////////////////////////

?????? // the following code is copied from ATL code(CComDispatchDriver),and modified

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?????? HRESULT GetIDOfName(LPCOLESTR lpsz,DISPID* pdispid)

?????? {

????????????? return m_pSoapClient->GetIDsOfNames(IID_NULL,(LPOLESTR*)&lpsz,1,LOCALE_USER_DEFAULT,pdispid);

?????? }

?????? // Invoke a method by DISPID with N parameters

?????? HRESULT Invoke(DISPID dispid,VARIANT* pvarParams,int nParams,VARIANT* pvarRet = NULL)

?????? {

????????????? DISPPARAMS dispparams = { pvarParams,nParams,0};

????????????? return m_pSoapClient->Invoke(dispid,IID_NULL,DISPATCH_METHOD,&dispparams,pvarRet,NULL);

?????? }

?????? // Invoke a method by name with Nparameters

?????? HRESULT Invoke(LPCOLESTR lpszName,VARIANT* pvarRet = NULL)

?????? {

????????????? HRESULT hr;

????????????? DISPID dispid;

????????????? hr = GetIDOfName(lpszName,&dispid);

????????????? if (SUCCEEDED(hr))

???????????????????? hr = Invoke(dispid,pvarParams,pvarRet);

????????????? return hr;

?????? }

};