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);
}
}
}
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