C++ 运行单个实例，防止程序多次启动

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利用内核对象封装的类，使用运行单个实例，防止多次启动Demo

例子下载地址：http://pan.baidu.com/share/link?shareid=3202369154&uk=3037189616

光影道和

//File Name: Singleton.h#pragma onceclass Singleton{private:    CString strGUID;    CString strMapFileGUID;    HANDLE m_hSingleton;public:    Singleton();    ~Singleton();public:    void AppStart (const HWND & hWnd) const;};

//File Name: Singleton.cpp#include "stdafx.h"#include "Singleton.h"Singleton::Singleton(){    strGUID = _T("{D727BDB5-F86A-405b-910D-11AD2A4CA76E}");    strMapFileGUID = strGUID + _T("_MapFile");    m_hSingleton = NULL;}Singleton::~Singleton(){    if (m_hSingleton)    {        CloseHandle(m_hSingleton);        m_hSingleton = NULL;    }}void Singleton::AppStart(const HWND & hWnd) const{    HANDLE m_hSingleton = NULL;    m_hSingleton = CreateMutex(NULL, TRUE, strGUID);    RECT rect;    ZeroMemory(&rect, sizeof(rect));    ::GetWindowRect(hWnd, &rect);    if (GetLastError() == ERROR_ALREADY_EXISTS)    {        // 打开共享文件        HANDLE hHandle = ::OpenFileMapping(FILE_MAP_ALL_ACCESS, FALSE, strMapFileGUID);        if (hHandle)        {            LPTSTR lpMapAddr = (LPTSTR)::MapViewOfFile(hHandle, FILE_MAP_ALL_ACCESS, 0, 0, 0);            CString strBuffer(lpMapAddr);                        HWND hOldWnd = (HWND)_tcstoul(strBuffer, NULL, 10);            ::SetForegroundWindow(hOldWnd);            // 取消内核对象的映射            UnmapViewOfFile(hHandle);            CloseHandle(hHandle);            exit(0);        }            }    else        // 第一运行程序    {        int nNum = sizeof(HANDLE);                // 创建文件映射内核对象        HANDLE hHandle = ::CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, sizeof(HANDLE), strMapFileGUID);        if (hHandle)        {            // 拷贝数据到共享文件里            LPTSTR lpMapAddr = (LPTSTR)::MapViewOfFile(hHandle, FILE_MAP_ALL_ACCESS, 0, 0, 0);            CString strBuffer;            strBuffer.Format(_T("%d"), hWnd);            _tcscpy(lpMapAddr, strBuffer);            // 讲写入文件映射缓冲区的所有数据刷新到磁盘；            ::FlushViewOfFile(lpMapAddr, strBuffer.GetLength()+1);        }    }}

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