/// <summary> /// 遍历从属服务 /// </summary> /// <param name="serviceHandle"></param> /// <param name="state">选择性遍历(活动、非活动、全部)</param> private static string[] EnumDependentServices(IntPtr serviceHandle, EnumServiceState state) { int bytesNeeded = 0; //存放从属服务的空间大小,由API返回 int numEnumerated = 0; //从属服务数,由API返回 //先尝试以空结构获取,如获取成功说明从属服务为空,否则拿到上述俩值 if (Win32Class.EnumDependentServices(serviceHandle, state, IntPtr.Zero, 0, ref bytesNeeded, ref numEnumerated)) { return(new string[0]); } if (Marshal.GetLastWin32Error() != 0xEA) //仅当错误值不是大小不够(ERROR_MORE_DATA)时才抛异常 { throw new Win32Exception(); } //在非托管区域创建指针 IntPtr structsStart = Marshal.AllocHGlobal(new IntPtr(bytesNeeded)); try { //往上述指针处塞存放从属服务的结构组,每个从属服务是一个结构 if (!Win32Class.EnumDependentServices(serviceHandle, state, structsStart, bytesNeeded, ref bytesNeeded, ref numEnumerated)) { throw new Win32Exception(); } string[] dependentServices = new string[numEnumerated]; int sizeOfStruct = Marshal.SizeOf(typeof(Win32Class.ENUM_SERVICE_STATUS)); //每个结构的大小 long structsStartAsInt64 = structsStart.ToInt64(); for (int i = 0; i < numEnumerated; i++) { Win32Class.ENUM_SERVICE_STATUS structure = new Win32Class.ENUM_SERVICE_STATUS(); IntPtr ptr = new IntPtr(structsStartAsInt64 + i * sizeOfStruct); //根据起始指针、结构次序和结构大小推算各结构起始指针 Marshal.PtrToStructure(ptr, structure); //根据指针拿到结构 dependentServices[i] = structure.serviceName; //从结构中拿到服务名 } return(dependentServices); } finally { Marshal.FreeHGlobal(structsStart); } }
/// <summary> /// 遍历从属服务 /// </summary> /// <param name="serviceHandle"></param> /// <param name="state">选择性遍历(活动、非活动、全部)</param> private static string[] EnumDependentServices(IntPtr serviceHandle, EnumServiceState state) { int bytesNeeded = 0; //存放从属服务的空间大小,由API返回 int numEnumerated = 0; //从属服务数,由API返回 //先尝试以空结构获取,如获取成功说明从属服务为空,否则拿到上述俩值 if (Win32Class.EnumDependentServices(serviceHandle, state, IntPtr.Zero, 0, ref bytesNeeded, ref numEnumerated)) { return new string[0]; } if (Marshal.GetLastWin32Error() != 0xEA) //仅当错误值不是大小不够(ERROR_MORE_DATA)时才抛异常 { throw new Win32Exception(); } //在非托管区域创建指针 IntPtr structsStart = Marshal.AllocHGlobal(new IntPtr(bytesNeeded)); try { //往上述指针处塞存放从属服务的结构组,每个从属服务是一个结构 if (!Win32Class.EnumDependentServices(serviceHandle, state, structsStart, bytesNeeded, ref bytesNeeded, ref numEnumerated)) { throw new Win32Exception(); } string[] dependentServices = new string[numEnumerated]; int sizeOfStruct = Marshal.SizeOf(typeof(Win32Class.ENUM_SERVICE_STATUS)); //每个结构的大小 long structsStartAsInt64 = structsStart.ToInt64(); for (int i = 0; i < numEnumerated; i++) { Win32Class.ENUM_SERVICE_STATUS structure = new Win32Class.ENUM_SERVICE_STATUS(); IntPtr ptr = new IntPtr(structsStartAsInt64 + i * sizeOfStruct); //根据起始指针、结构次序和结构大小推算各结构起始指针 Marshal.PtrToStructure(ptr, structure); //根据指针拿到结构 dependentServices[i] = structure.serviceName; //从结构中拿到服务名 } return dependentServices; } finally { Marshal.FreeHGlobal(structsStart); } }