레지스트리 감시

레지스트리 감시

 

http://msdn.microsoft.com/en-us/library/ms724892(VS.85).aspx

 

레지스트리의 특정 키값을 변경을 통지 받을 수 있다.

 

LONG WINAPI RegNotifyChangeKeyValue(   __in      HKEY hKey,   __in      BOOL bWatchSubtree,   __in      DWORD dwNotifyFilter,   __in_opt  HANDLE hEvent,   __in      BOOL fAsynchronous );

 

아래는 Thread에서 특정 Registry Key를 감시하는 샘플이다.

int  MonitoringRegChange( WCHAR *pwKey ) {    DWORD  dwFilter = REG_NOTIFY_CHANGE_NAME | REG_NOTIFY_CHANGE_LAST_SET; HKEY   hKey = NULL;   LONG lErrorCode = ::RegOpenKeyEx( HKEY_CURRENT_USER, pwKey, 0, KEY_NOTIFY, &hKey); if ( lErrorCode != ERROR_SUCCESS ) { if ( lErrorCode != ERROR_FILE_NOT_FOUND  ) { return -1; }   lErrorCode = RegCreateKeyEx( HKEY_CURRENT_USER, pwKey, 0, NULL, 0, KEY_NOTIFY, NULL, &hKey, NULL) ; if ( lErrorCode != ERROR_SUCCESS ) { return -1; } }   HANDLE hEvent = CreateEvent(NULL, TRUE, FALSE, NULL); if (hEvent == NULL) { CloseHandle(hEvent); RegCloseKey(hKey); return -1; }   HANDLE hEvents[2]; hEvents[0] = m_hExitEvent; hEvents[1] = hEvent;   while( TRUE ) { lErrorCode = RegNotifyChangeKeyValue( hKey, TRUE, dwFilter, hEvent, TRUE ); if (lErrorCode != ERROR_SUCCESS) // Reg감시중, key삭제되는경우의복구루틴 { RegCloseKey(hKey);             if ( lErrorCode != ERROR_KEY_DELETED )             {                return -1;             }          lErrorCode = RegCreateKeyEx( HKEY_CURRENT_USER, pwKey, 0, NULL, 0, KEY_NOTIFY, NULL, &hKey, NULL) ;             if ( lErrorCode != ERROR_SUCCESS )             { return -1;             }            // Detect Registry Changed – Key is Deleted             continue; }   if ( WaitForSingleObject( hEvent, 0 ) == WAIT_OBJECT_0 ) { // 첫번째 RegNotifyChangeKeyValue() Call과두번째 RegNotifyChangeKeyValue() // Call사이에 변경이있을경우, Envent가 바로활성화되어, // 한번의 레지스트리 변경에 대해 두번의 noty를받게되는 문제 Fix             // http://support.microsoft.com/kb/236570/en-us             lErrorCode = RegNotifyChangeKeyValue( hKey, TRUE, dwFilter, hEvent, TRUE );             if (lErrorCode != ERROR_SUCCESS)             {                CloseHandle(hEvent);                RegCloseKey(hKey);                return -1;             } }   DWORD dwResult = ::WaitForMultipleObjects( 2, hEvents, FALSE, INFINITE ); if ( dwResult == WAIT_FAILED ) { CloseHandle(hEvent);             RegCloseKey(hKey);             return -1; } else if ( dwResult == WAIT_OBJECT_0 ) {    // recevie Stop monitoring noty       return 0;   } else if ( dwResult == WAIT_OBJECT_0 + 1 ) { // Detect Registry Changed continue; } }   CloseHandle(hEvent); RegCloseKey(hKey);            return 0; }