C++停止服务及其依赖项
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概要
详细信息
可以通过将 SERVICE_CONTROL_STOP 请求发送到服务通过 SCM ControlService() API 通过停止服务。如果 SCM 收到 SERVICE_CONTROL_STOP 请求服务时，它指示服务停止通过转发 stop 代码服务的ServiceMain()功能才能正常工作。但是，如果 SCM 确定其他正在运行的服务都依赖于指定的服务，它将不会转发停止请求。相反，它将返回错误代码 1051 (ERROR_DEPENDENT_SERVICES_RUNNING) —"停止控制已发送给其他正在运行的服务依赖的服务。"
示例代码
下面的代码实现一个StopService()函数，还可以尝试停止指定的服务相关性。//**********************************************************************// // This program demonstrates how to programmatically stop a service // by first stopping its dependencies.// // THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED// TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A// PARTICULAR PURPOSE.// // Copyright (C) 1999 Microsoft Corporation. All rights reserved.// //**********************************************************************#include <windows.h>#include <tchar.h>#include <stdio.h>//**********************************************************************// // StopService()// // PURPOSE : This function attempts to stop a service. It allows// the caller to specify whether dependent services// should also be stopped. It also allows a timeout// value to be passed, to prevent a scenario in which a// service shutdown hangs, and in turn the application// stopping the service hangs.// // PARAMETERS: hSCM - open handle to the service control manager// hService - open handle to the service to be stopped// fStopDependencies - flag indicating whether to stop// dependent services// dwTimeout - maximum time (in milliseconds) to wait// for the service and its dependencies to stop// // RETURN VALUE: If the operation is successful, ERROR_SUCCESS is // returned. Otherwise, a Win32 error code is returned.// //**********************************************************************DWORD StopService( SC_HANDLE hSCM, SC_HANDLE hService, BOOL fStopDependencies, DWORD dwTimeout ) { SERVICE_STATUS ss; DWORD dwStartTime = GetTickCount(); // Make sure the service is not already stopped if ( !QueryServiceStatus( hService, &ss ) ) return GetLastError(); if ( ss.dwCurrentState == SERVICE_STOPPED ) return ERROR_SUCCESS; // If a stop is pending, just wait for it while ( ss.dwCurrentState == SERVICE_STOP_PENDING ) { Sleep( ss.dwWaitHint ); if ( !QueryServiceStatus( hService, &ss ) ) return GetLastError(); if ( ss.dwCurrentState == SERVICE_STOPPED ) return ERROR_SUCCESS; if ( GetTickCount() - dwStartTime > dwTimeout ) return ERROR_TIMEOUT; } // If the service is running, dependencies must be stopped first if ( fStopDependencies ) { DWORD i; DWORD dwBytesNeeded; DWORD dwCount; LPENUM_SERVICE_STATUS lpDependencies = NULL; ENUM_SERVICE_STATUS ess; SC_HANDLE hDepService; // Pass a zero-length buffer to get the required buffer size if ( EnumDependentServices( hService, SERVICE_ACTIVE, lpDependencies, 0, &dwBytesNeeded, &dwCount ) ) { // If the Enum call succeeds, then there are no dependent // services so do nothing } else { if ( GetLastError() != ERROR_MORE_DATA ) return GetLastError(); // Unexpected error // Allocate a buffer for the dependencies lpDependencies = (LPENUM_SERVICE_STATUS) HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, dwBytesNeeded ); if ( !lpDependencies ) return GetLastError(); __try { // Enumerate the dependencies if ( !EnumDependentServices( hService, SERVICE_ACTIVE, lpDependencies, dwBytesNeeded, &dwBytesNeeded, &dwCount ) ) return GetLastError(); for ( i = 0; i < dwCount; i++ ) { ess = *(lpDependencies + i); // Open the service hDepService = OpenService( hSCM, ess.lpServiceName, SERVICE_STOP | SERVICE_QUERY_STATUS ); if ( !hDepService ) return GetLastError(); __try { // Send a stop code if ( !ControlService( hDepService, SERVICE_CONTROL_STOP, &ss ) ) return GetLastError(); // Wait for the service to stop while ( ss.dwCurrentState != SERVICE_STOPPED ) { Sleep( ss.dwWaitHint ); if ( !QueryServiceStatus( hDepService, &ss ) ) return GetLastError(); if ( ss.dwCurrentState == SERVICE_STOPPED ) break; if ( GetTickCount() - dwStartTime > dwTimeout ) return ERROR_TIMEOUT; } } __finally { // Always release the service handle CloseServiceHandle( hDepService ); } } } __finally { // Always free the enumeration buffer HeapFree( GetProcessHeap(), 0, lpDependencies ); } } } // Send a stop code to the main service if ( !ControlService( hService, SERVICE_CONTROL_STOP, &ss ) ) return GetLastError(); // Wait for the service to stop while ( ss.dwCurrentState != SERVICE_STOPPED ) { Sleep( ss.dwWaitHint ); if ( !QueryServiceStatus( hService, &ss ) ) return GetLastError(); if ( ss.dwCurrentState == SERVICE_STOPPED ) break; if ( GetTickCount() - dwStartTime > dwTimeout ) return ERROR_TIMEOUT; } // Return success return ERROR_SUCCESS;}//**********************************************************************// // DisplayError()// // PURPOSE : This is a helper function to display an error message // if a function in _tmain() fails.// // PARAMETERS: szAPI - the name of the function that failed// // dwError - the Win32 error code indicating why the// function failed// // RETURN VALUE: None// //**********************************************************************void DisplayError( LPTSTR szAPI, DWORD dwError ) { LPTSTR lpBuffer = NULL; FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, NULL, dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR) &lpBuffer, 0, NULL ); _tprintf( TEXT("%s failed:\n"), szAPI ); _tprintf( TEXT(" error code = %u\n"), dwError ); _tprintf( TEXT(" message = %s\n"), lpBuffer ); LocalFree( lpBuffer );}//**********************************************************************// // _tmain() -- becomes main() for ANSI or wmain() for Unicode// // PURPOSE : This is the entry point for the program. This function// contains sample code demonstrating how to use the// StopService() function implemented above.// // PARAMETERS: argc - the number of command-line arguments// argv[] - an array of command-line arguments// // RETURN VALUE: None// //**********************************************************************void _tmain( int argc, TCHAR *argv[] ) { SC_HANDLE hSCM; SC_HANDLE hService; DWORD dwError; if ( argc < 2 ) { _tprintf( TEXT("usage: \"%s\" <ServiceName>\n"), argv[0] ); return; } __try { // Open the SCM database hSCM = OpenSCManager( NULL, NULL, SC_MANAGER_CONNECT ); if ( !hSCM ) { DisplayError( TEXT("OpenSCManager()"), GetLastError() ); __leave; } // Open the specified service hService = OpenService( hSCM, argv[1], SERVICE_STOP | SERVICE_QUERY_STATUS | SERVICE_ENUMERATE_DEPENDENTS ); if ( !hService ) { DisplayError( TEXT("OpenService()"), GetLastError() ); __leave; } // Try to stop the service, specifying a 30 second timeout dwError = StopService( hSCM, hService, TRUE, 30000 ) ; if ( dwError == ERROR_SUCCESS ) _tprintf( TEXT("Service stopped.\n") ); else DisplayError( TEXT("StopService()"), dwError ); } __finally { if ( hService ) CloseServiceHandle( hService ); if ( hSCM ) CloseServiceHandle( hSCM ); }} 0 0
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