复制代码 代码如下:

//File Name: Singleton.h

#pragma once

class Singleton

{

private:

CString strGUID;

CString strMapFileGUID;

HANDLE m_hSingleton;

public:

Singleton();

~Singleton();

public:

void AppStart (const HWND & hWnd) const;

};

复制代码 代码如下:

//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);

}

}

}