每日一贴,今天的内容关键字为实现接口

// Service.h, DLL定义(供实现方、调用方使用)#ifdef SERVICE_EXPORTS#define SERVICE_API extern "C" __declspec(dllexport)
#else#define SERVICE_API//#define SERVICE_API extern "C" __declspec(dllimport)
#endifinterface IService
{
public:IService() {}virtual ~IService() {}public:virtual void Start() = 0;virtual void Stop() = 0;
};typedef IService *(*CreateInstance_t)();
typedef void (*DestroyInstance_t)(IService *pInst);SERVICE_API IService *CreateInstance();
SERVICE_API void DestroyInstance(IService *pInst);// Service.cpp, DLL实现#include "Service.h"
class CService : public IService
{
public:CService();virtual ~CService();public:virtual void Start();virtual void Stop();private://.....
};CService::CService()
{
}CService::~CService()
{
}void CService::Start()
{
}void CService::Stop()
{
}IService *CreateInstance()
{return new CService();
}void DestroyInstance(IService *pInst)
{if (!pInst) return;delete pInst;
}SERVICE_API HRESULT WINAPI DllRegisterServer()
{//CMD> regsvr32.exe Service.dll 时须要执行的安装代码return S_OK;
}SERVICE_API HRESULT WINAPI DllUnregisterServer()
{//CMD> regsvr32.exe /u Service.dll 时须要执行的卸载代码return S_OK;
}// Demo.cpp, DLL调用#include "Service.h"
int WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)
{HMODULE hDll = LoadLibraryA("Service.dll");if (hDll){CreateInstance_t pfnCreateInstance =(CreateInstance_t)GetProcAddress(hDll, "CreateInstance");DestroyInstance_t pfnDestroyInstance =(DestroyInstance_t)GetProcAddress(hDll, "DestroyInstance");if (pfnCreateInstance && pfnDestroyInstance){IService *pInst = pfnCreateInstance();if (pInst){pInst->Start();pInst->Stop();pfnDestroyInstance(pInst);}}FreeLibrary(hDll);}return 0;
}

文章结束给大家分享下程序员的一些笑话语录： 《诺基亚投资手机浏览器UCWEB，资金不详或控股》杯具了，好不容易养大的闺女嫁外国。（心疼是你养的吗？中国创业型公司创业初期哪个从国有银行贷到过钱？）

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实现和接口
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