高手进阶：给WINDOWS服务加上描述之一

using System;
using System.Runtime.InteropServices;

namespace FileWatchService
{
 public class modAPI
 {
  [DllImport("advapi32.dll")]
  public static extern int LockServiceDatabase(int hSCManager);
 
  [DllImport("advapi32.dll")]
  public static extern bool UnlockServiceDatabase(int hSCManager);
 
  [DllImport("kernel32.dll")]
  public static extern void CopyMemory(IntPtr pDst, SC_ACTION[] pSrc,int ByteLen);
 
  [DllImport("advapi32.dll")]
  public static extern bool ChangeServiceConfigA(
   int hService, ServiceType dwServiceType, int dwStartType,
   int dwErrorControl, string lpBinaryPathName, string lpLoadOrderGroup,
   int lpdwTagId, string lpDependencies, string lpServiceStartName,
   string lpPassword, string lpDisplayName);
    
  [DllImport("advapi32.dll")]
  public static extern bool ChangeServiceConfig2A(
   int hService, InfoLevel dwInfoLevel, 
   [MarshalAs(UnmanagedType.Struct)] ref SERVICE_DESCRIPTION lpInfo);
  [DllImport("advapi32.dll")]
  public static extern bool ChangeServiceConfig2A(
   int hService, InfoLevel dwInfoLevel, 
   [MarshalAs(UnmanagedType.Struct)] ref SERVICE_FAILURE_ACTIONS lpInfo);
  [DllImport("advapi32.dll")]
  public static extern int OpenServiceA(
   int hSCManager, string lpServiceName, ACCESS_TYPE dwDesiredAccess);
  [DllImport("advapi32.dll")]
  public static extern int OpenSCManagerA(
   string lpMachineName, string lpDatabaseName, ServiceControlManagerType dwDesiredAccess);
  [DllImport("advapi32.dll")]
  public static extern bool CloseServiceHandle(
   int hSCObject);
  [DllImport("advapi32.dll")]
  public static extern bool QueryServiceConfigA(
   int hService, [MarshalAs(UnmanagedType.Struct)] 
    ref QUERY_SERVICE_CONFIG lpServiceConfig, int cbBufSize,
   int pcbBytesNeeded);
  [DllImport("advapi32.dll")]
  public static extern int StartService(int SVHANDLE,int dwNumServiceArgs,string lpServiceArgVectors);
  public const int STANDARD_RIGHTS_REQUIRED = 0xF0000;
  public const int GENERIC_READ = -2147483648;
  public const int ERROR_INSUFFICIENT_BUFFER = 122;
  public const int SERVICE_NO_CHANGE = -1;
  //public const int SERVICE_NO_CHANGE = 0xFFFF;
  public enum ServiceType
  {
   SERVICE_KERNEL_DRIVER = 0x1,
   SERVICE_FILE_SYSTEM_DRIVER = 0x2,
   SERVICE_WIN32_OWN_PROCESS = 0x10,
   SERVICE_WIN32_SHARE_PROCESS = 0x20,
   SERVICE_INTERACTIVE_PROCESS = 0x100,
   SERVICETYPE_NO_CHANGE = SERVICE_NO_CHANGE
  }
  public enum ServiceStartType:int
  {
   SERVICE_BOOT_START = 0x0,
   SERVICE_SYSTEM_START = 0x1,
   SERVICE_AUTO_START = 0x2,
   SERVICE_DEMAND_START = 0x3,
   SERVICE_DISABLED = 0x4,
   SERVICESTARTTYPE_NO_CHANGE = SERVICE_NO_CHANGE
  }
  public enum ServiceErrorControl:int
  {
   SERVICE_ERROR_IGNORE = 0x0,
   SERVICE_ERROR_NORMAL = 0x1,
   SERVICE_ERROR_SEVERE = 0x2,
   SERVICE_ERROR_CRITICAL = 0x3,
   msidbServiceInstallErrorControlVital = 0x8000,
   SERVICEERRORCONTROL_NO_CHANGE = SERVICE_NO_CHANGE
  }
  public enum ServiceStateRequest:int
  {
   SERVICE_ACTIVE = 0x1,
   SERVICE_INACTIVE = 0x2,
   SERVICE_STATE_ALL = (SERVICE_ACTIVE + SERVICE_INACTIVE)
  }
  public enum ServiceControlType:int
  {
   SERVICE_CONTROL_STOP = 0x1,
   SERVICE_CONTROL_PAUSE = 0x2,
   SERVICE_CONTROL_CONTINUE = 0x3,
   SERVICE_CONTROL_INTERROGATE = 0x4,
   SERVICE_CONTROL_SHUTDOWN = 0x5,
   SERVICE_CONTROL_PARAMCHANGE = 0x6,
   SERVICE_CONTROL_NETBINDADD = 0x7,
   SERVICE_CONTROL_NETBINDREMOVE = 0x8,
   SERVICE_CONTROL_NETBINDENABLE = 0x9,
   SERVICE_CONTROL_NETBINDDISABLE = 0xA,
   SERVICE_CONTROL_DEVICEEVENT = 0xB,
   SERVICE_CONTROL_HARDWAREPROFILECHANGE = 0xC,
   SERVICE_CONTROL_POWEREVENT = 0xD,
   SERVICE_CONTROL_SESSIONCHANGE = 0xE,
  }
 
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