icmp.bas

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

Attribute VB_Name = "ICMP"
' WSock32 UDTs

Type Inet_address
    Byte4 As String * 1
    Byte3 As String * 1
    Byte2 As String * 1
    Byte1 As String * 1
End Type

Public IPLong As Inet_address

Type WSAdata
    wVersion As Integer
    wHighVersion As Integer
    szDescription(0 To 255) As Byte
    szSystemStatus(0 To 128) As Byte
    iMaxSockets As Integer
    iMaxUdpDg As Integer
    lpVendorInfo As Long
End Type

Type Hostent
    h_name As Long
    h_aliases As Long
    h_addrtype As Integer
    h_length As Integer
    h_addr_list As Long
End Type

Type IP_OPTION_INFORMATION
    TTL As Byte                   ' TTL
    Tos As Byte                   ' 服务类型，通常为0
    Flags As Byte                 ' IP标头，通常为0
    OptionsSize As Long           ' 选择数据的大小，通常为0，最大为40
    OptionsData As String * 128   ' Options数据缓冲区
End Type

Public pIPo As IP_OPTION_INFORMATION

Type IP_ECHO_REPLY
    Address(0 To 3) As Byte           ' 回复地址
    Status As Long                    ' 回复状态
    RoundTripTime As Long             ' 周期，单位是微秒
    DataSize As Integer               ' 回复数据大小
    Reserved As Integer               ' 系统保留字段
    data As Long                      ' 回显数据的指针
    Options As IP_OPTION_INFORMATION  ' 回复选项
End Type

Public pIPe As IP_ECHO_REPLY

' WSock32 API函数

Declare Function gethostname Lib "wsock32.dll" (ByVal hostname$, HostLen&) As Long
Declare Function gethostbyname& Lib "wsock32.dll" (ByVal hostname$)
Declare Function WSAGetLastError Lib "wsock32.dll" () As Long
Declare Function WSAStartup Lib "wsock32.dll" (ByVal wVersionRequired&, lpWSAData As WSAdata) As Long
Declare Function WSACleanup Lib "wsock32.dll" () As Long

' Kernel32 API函数

Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (hpvDest As Any, hpvSource As Any, ByVal cbCopy As Long)

' ICMP API函数

    '
'创建一个ICMP请求句柄
Declare Function IcmpCreateFile Lib "icmp.dll" () As Long
'关闭ICMP句柄
Declare Function IcmpCloseHandle Lib "icmp.dll" (ByVal HANDLE As Long) As Boolean

    ' IcmpHandle从函数IcmpCreateFile返回得到
    ' DestAddress是指向地址列表的第一项的指针
    ' RequestData是一个没有结束符的64字节的字符串，里面包含字符的ASCII为170
    ' RequestSize大小为64字节    ' RequestOptions is a NULL at this time
    ' ReplyBuffer
    ' ReplySize
    ' Timeout为超时时间

Declare Function IcmpSendEcho Lib "ICMP" (ByVal IcmpHandle As Long, ByVal DestAddress As Long, _
    ByVal RequestData As String, ByVal RequestSize As Integer, RequestOptns As IP_OPTION_INFORMATION, _
     ReplyBuffer As IP_ECHO_REPLY, ByVal ReplySize As Long, ByVal TimeOut As Long) As Boolean