error.cls

本书源码主要针对目前流行的FTP、HTTP、E-mail、Telnet、ICMP、Modem串口通信编程、拨号网络编程等内容进行详细的讲解

VERSION 1.0 CLASS
BEGIN
  MultiUse = -1  'True
  Persistable = 0  'NotPersistable
  DataBindingBehavior = 0  'vbNone
  DataSourceBehavior  = 0  'vbNone
  MTSTransactionMode  = 0  'NotAnMTSObject
END
Attribute VB_Name = "RASError"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Option Explicit

'该类用于错误处理
'************************************************************************************************************************************************************************************

Public Function fcnRASErrorString() As String
    
   Dim lngRetCode As Long
   '所有的错误描述一般都不超过256个字节
   Dim strRASErrorString As String
    
   '首先创建一个空字符串
   strRASErrorString = Space$(256)
   '获得拨号产生的错误码
   Select Case lngRASErrorNumber
      Case Is >= 600
         lngRetCode = RasGetErrorString(lngRASErrorNumber, strRASErrorString, 256&)
         If lngRetCode Then
            '通常不会出现这种情况
            fcnRASErrorString = "Call To RasGetErrorString Failed. Error Retrieving The Error String!!!"
         Else
            '返回错误描述
            fcnRASErrorString = strRASErrorString
         End If
      Case NOT_SUPPORTED
         fcnRASErrorString = "Function Is Not Supported On This Version of Windows."
      Case Else
         fcnRASErrorString = "Unexpected Error. See WIN32 SDK More Information On This Error Number!!!"
   End Select
    
End Function
Public Property Get ErrorNumber() As Long

   '返回错误码，没有用处
   ErrorNumber = lngRASErrorNumber

End Property



Public Property Get Description() As String
   
   '获得描述
   Description = strRASDescription

End Property

Public Sub Clear()

   '清除错误
   lngRASErrorNumber = 0
   strRASDescription = ""
   
End Sub