创建专有命名空间单实例程序
// Singleton.h#pragma onceclass CSingleton{public:CSingleton(LPCTSTR lpszBoundary = _T("MyAppBoundary"), LPCTSTR lpszNamespace = _T("MyAppNamespace"));virtual ~CSingleton(void);public:BOOL IsInstanceExist(LPCTSTR lpszMutex);private:void DUMPINFO(LPCTSTR lpszFormat, ...);private:HANDLE m_hSingleton;HANDLE m_hBoundary;HANDLE m_hNamespace;BOOL m_bNamespaceOpen;};// Singleton.cpp#include "stdafx.h"#include "Singleton.h"#include <sddl.h>#pragma comment(lib, "Advapi32.lib")#define MAX_BUFFER_LENGTH(1024)CSingleton::CSingleton(LPCTSTR lpszBoundary, LPCTSTR lpszNamespace) : m_hSingleton(NULL), m_hBoundary(NULL), m_hNamespace(NULL), m_bNamespaceOpen(FALSE){// Create the boundary descriptorif(lpszBoundary && _tcslen(lpszBoundary)){m_hBoundary = CreateBoundaryDescriptor(lpszBoundary, 0);if(NULL == m_hBoundary){DUMPINFO(_T("CreateBoundaryDescriptor failed, error code : %d\r\n"), GetLastError());return ;}}if(NULL == m_hBoundary){DUMPINFO(_T("m_hBoundarg is NULL\r\n"));return ;}// Create SID corresponding to the local Adminstrator groupBYTE bySID[SECURITY_MAX_SID_SIZE] = {0};PSID pSID = bySID;DWORD dwSize = sizeof(bySID);if(!CreateWellKnownSid(WinBuiltinAdministratorsSid, NULL, pSID, &dwSize)){DUMPINFO(_T("CreateWellKnownSid failed, error code : %d\r\n"), GetLastError());return ;}// Associate the local admin SID to the boundary descriptorif(!AddSIDToBoundaryDescriptor(&m_hBoundary, pSID)){DUMPINFO(_T("AddSIDToBoundaryDescriptor failed, error code : %d\r\n"), GetLastError());return ;}// Create the namespace for local administrator onlySECURITY_ATTRIBUTES sa = {0};sa.nLength = sizeof(sa);sa.bInheritHandle = FALSE;if(!ConvertStringSecurityDescriptorToSecurityDescriptor(_T("D:(A;;GA;;;BA)"), SDDL_REVISION_1, &sa.lpSecurityDescriptor, NULL)){DUMPINFO(_T("ConvertStringSecurityDescriptorToSecurityDescriptor failed, error code : %d\r\n"), GetLastError());return ;}if(lpszNamespace && _tcslen(lpszNamespace)){m_hNamespace = CreatePrivateNamespace(&sa, m_hBoundary, lpszNamespace);DWORD dwRet = GetLastError();LocalFree(sa.lpSecurityDescriptor);if(NULL == m_hNamespace){if(ERROR_ALREADY_EXISTS != dwRet){DUMPINFO(_T("CreatePrivateNamespace failed, error code : %d\r\n"), dwRet);return ;}else{m_hNamespace = OpenPrivateNamespace(m_hBoundary, lpszNamespace);if(NULL == m_hNamespace){DUMPINFO(_T("OpenPrivateNamespace failed, error code : %d\r\n"), dwRet);return ;}m_bNamespaceOpen = TRUE;}}}if(NULL == lpszNamespace){DUMPINFO(_T("lpszNamespace is NULL\r\n"));return ;}}CSingleton::~CSingleton(void){if(NULL != m_hSingleton){CloseHandle(m_hSingleton);m_hSingleton = NULL;}if(NULL != m_hNamespace){ClosePrivateNamespace(m_hNamespace, m_bNamespaceOpen ? 0 : PRIVATE_NAMESPACE_FLAG_DESTROY);m_hNamespace = NULL;}if(NULL != m_hBoundary){DeleteBoundaryDescriptor(m_hBoundary);m_hBoundary = NULL;}}void CSingleton::DUMPINFO(LPCTSTR lpszFormat, ...){TCHAR szText[MAX_BUFFER_LENGTH] = {0};va_list argList;va_start(argList, lpszFormat);_vstprintf_s(szText, _countof(szText), lpszFormat, argList);va_end(argList);OutputDebugString(szText);}BOOL CSingleton::IsInstanceExist(LPCTSTR lpszMutex){if(m_hBoundary && m_hNamespace && lpszMutex && _tcslen(lpszMutex)){m_hSingleton = CreateMutex(NULL, FALSE, lpszMutex);DWORD dwRet = GetLastError();if(NULL == m_hSingleton){DUMPINFO(_T("CreateMutex failed, error code : %d\r\n"), dwRet);return FALSE;}if(ERROR_ALREADY_EXISTS == dwRet){DUMPINFO(_T("The another instance of App is running ...\r\n"));return TRUE;}else{DUMPINFO(_T("The first instance of App ...\r\n"));}}return FALSE;}// 调用方法，主要修改App类的InitInstance函数CSingleton* m_pSingleton = NULL; // 定义为App类的成员变量，并在App类的构造函数中初始化为NULLm_pSingleton = new CSingleton(_T("Chapter3Boundary"), _T("Chapter3Namesapce"));BOOL CXXXXXApp::InitInstance(){ // Check Instance of App if((NULL != m_pSingleton) && (m_pSingleton->IsInstanceExist(_T("Chapter3Mutex")))) { return FALSE; } ...}