Developing COM Components using VC-ATL(3-5)

4. 编写实现函数功能的代码 

     ValidateCard.cpp清单

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     // ValidateCard.cpp : Implementation of CValidateCard

#include "stdafx.h"

#include "ValidateCreditCardServer.h"

#include "ValidateCard.h"

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

// CValidateCard 

STDMETHODIMP CValidateCard::ValidateCreditCard(BSTR bstrCCNo, BSTR bstrCCType, long *val)

{

         AFX_MANAGE_STATE(AfxGetStaticModuleState()) 

         // TODO: Add your implementation code here

    CString strType(bstrCCType);

         strType.MakeUpper();

         if(strType.Compare("VISA")==0)

                   bstrCCType=SysAllocString(OLESTR("V"));

         else if(strType.Compare("MASTER")==0)

                   bstrCCType=SysAllocString(OLESTR("M"));

         else if(strType.Compare("AMERICAN")==0)

                   bstrCCType=SysAllocString(OLESTR("A"));

         else

         {

                   *val=0;

                   return S_FALSE;

         }