creditobject.cpp

Visual_C++[1].NET_Bible1 Visual_C++宝典书中的全部源码

// CreditObject.cpp
#include "stdafx.h"
#include "CreditServer_h.h"
#include "CreditObject.h"

long g_cComponents = 0;

CCreditVerification::CCreditVerification() : m_refCount(1) 
{
	InterlockedIncrement(&g_cComponents);
}

CCreditVerification::~CCreditVerification() 
{
	InterlockedDecrement(&g_cComponents);
}

// ICreditVerification
HRESULT __stdcall CCreditVerification::SetCardType(unsigned char* s)
{
	if (0 == strcmp("Visa", (const char*)s))
		m_type = Visa;
	else if (0 == strcmp("MasterCard", (const char*)s))
		m_type = MasterCard;
	else m_type = Amex;
	return S_OK;
}
HRESULT __stdcall CCreditVerification::VerifyCardNumber(long n) 
{
	if (m_type == Visa && (n % 2))
		return S_OK;
	else if (m_type == MasterCard && (n % 3))
		return S_OK;
	else if (m_type == Amex && (n % 5))
		return S_OK;
	else return E_INVALIDARG;
}

// IUnknown
HRESULT __stdcall CCreditVerification::QueryInterface(REFIID iid, void**pp)
{
	if (NULL == pp)
		return E_INVALIDARG;
	*pp = NULL;

	if (iid == IID_IUnknown) 
		*pp = this;
	else if (iid == IID_ICreditVerification)
		*pp = static_cast<ICreditVerification*>(this);

	if (*pp)
	{
		AddRef();
		return S_OK;
	}
	return E_NOINTERFACE;
}

ULONG __stdcall CCreditVerification::AddRef() 
{
	return InterlockedIncrement(&m_refCount); 
}

ULONG __stdcall CCreditVerification::Release() 
{
	if (InterlockedDecrement(&m_refCount) == 0) 
	{
		delete this;
		return 0;
	}
	return m_refCount;
}