高手帮忙解释下，关于《不使用installutil.exe安装WINDOWS服务》

using System;
using System.Runtime.InteropServices;
namespace MyServiceInstaller
{class ServiceInstaller
{
#region Private Variables
private string _servicePath;
private string _serviceName;
private string _serviceDisplayName;
#endregion Private Variables
#region DLLImport
[DllImport("advapi32.dll")]
public static extern IntPtr OpenSCManager(string lpMachineName,string lpSCDB, int scParameter);
[DllImport("Advapi32.dll")]
public static extern IntPtr CreateService(IntPtr SC_HANDLE,string lpSvcName,string lpDisplayName, 
int dwDesiredAccess,int dwServiceType,int dwStartType,int dwErrorControl,string lpPathName, 
string lpLoadOrderGroup,int lpdwTagId,string lpDependencies,string lpServiceStartName,string lpPassword);
[DllImport("advapi32.dll")]
public static extern void CloseServiceHandle(IntPtr SCHANDLE);
[DllImport("advapi32.dll")]
public static extern int StartService(IntPtr SVHANDLE,int dwNumServiceArgs,string lpServiceArgVectors);
[DllImport("advapi32.dll",SetLastError=true)]
public static extern IntPtr OpenService(IntPtr SCHANDLE,string lpSvcName,int dwNumServiceArgs);
[DllImport("advapi32.dll")]
public static extern int DeleteService(IntPtr SVHANDLE);
[DllImport("kernel32.dll")]
public static extern int GetLastError();
#endregion DLLImport
/// 
/// 应用程序入口.
/// [STAThread]
static void Main(string[] args)
{string svcPath;
string svcName;
string svcDispName;
//服务程序的路径
svcPath = @"C:\MyService.exe";
svcDispName="MyService";
svcName= "MyService";
ServiceInstaller c = new ServiceInstaller();
c.InstallService(svcPath, svcName, svcDispName);
Console.Read();}/// 
/// 安装和运行
/// 
/// 程序路径.
/// 服务名
/// 服务显示名称.
/// 服务安装是否成功.
public bool InstallService(string svcPath, string svcName, string svcDispName)
{
#region Constants declaration.
int SC_MANAGER_CREATE_SERVICE = 0x0002;
int SERVICE_WIN32_OWN_PROCESS = 0x00000010;
//int SERVICE_DEMAND_START = 0x00000003;
int SERVICE_ERROR_NORMAL = 0x00000001;
int STANDARD_RIGHTS_REQUIRED = 0xF0000;
int SERVICE_QUERY_CONFIG = 0x0001;
int SERVICE_CHANGE_CONFIG = 0x0002;
int SERVICE_QUERY_STATUS = 0x0004;
int SERVICE_ENUMERATE_DEPENDENTS = 0x0008;
int SERVICE_START =0x0010;
int SERVICE_STOP =0x0020;
int SERVICE_PAUSE_CONTINUE =0x0040;
int SERVICE_INTERROGATE =0x0080;
int SERVICE_USER_DEFINED_CONTROL =0x0100;
int SERVICE_ALL_ACCESS = (STANDARD_RIGHTS_REQUIRED | 
SERVICE_QUERY_CONFIG |
SERVICE_CHANGE_CONFIG |
SERVICE_QUERY_STATUS | 
SERVICE_ENUMERATE_DEPENDENTS | 
SERVICE_START | 
SERVICE_STOP | 
SERVICE_PAUSE_CONTINUE | 
SERVICE_INTERROGATE | 
SERVICE_USER_DEFINED_CONTROL);
int SERVICE_AUTO_START = 0x00000002;
#endregion Constants declaration.
try
{
IntPtr sc_handle = OpenSCManager(null,null,SC_MANAGER_CREATE_SERVICE);
if (sc_handle.ToInt32() != 0)
{
IntPtr sv_handle = CreateService(sc_handle,svcName,svcDispName,SERVICE_ALL_ACCESS,SERVICE_WIN32_OWN_PROCESS, SERVICE_AUTO_START,SERVICE_ERROR_NORMAL,svcPath,null,0,null,null,null);
if(sv_handle.ToInt32() ==0)
{
CloseServiceHandle(sc_handle);
return false;
}
else
{
//试尝启动服务
int i = StartService(sv_handle,0,null);
if(i==0)
{return false;
}CloseServiceHandle(sc_handle);
return true;
}
}
elsereturn false;
}
catch(Exception e)
{
throw e;
}
}
/// 
/// 反安装服务.
/// 
/// 服务名.
public bool UnInstallService(string svcName)
{
int GENERIC_WRITE = 0x40000000;
IntPtr sc_hndl = OpenSCManager(null,null,GENERIC_WRITE);
if(sc_hndl.ToInt32() !=0)
{
int DELETE = 0x10000;
IntPtr svc_hndl = OpenService(sc_hndl,svcName,DELETE);
if(svc_hndl.ToInt32() !=0)
{ 
int i = DeleteService(svc_hndl);
if (i != 0)
{
CloseServiceHandle(sc_hndl);
return true;
}
else
{
CloseServiceHandle(sc_hndl);
return false;
}
}
else
return false;
}
else
return false;
}
}
}上面的程序是我在网上找的，非常好用，但我不明白这些二进制码是如何获得的，这段程序对我来说有如天书，请高手赐教！谢谢！！