我写了个 Ping 模块 很实用！

今天周末，看见同事为写一个Ping程序着急，我就改写了个Ping函数，给他，他不要，那算了，呵呵，贴出来，想要的同志可以“剪”去，

算是我送给大家的一个小礼物！

图：Ping通的情况

图：Ping失败的情况

下面是源代码(VB6)：(完善的出错控制，所以是个好函数）

Option Explicit

Private Const IP_SUCCESS As Long = 0
Private Const IP_STATUS_BASE As Long = 11000
Private Const IP_BUF_TOO_SMALL As Long = (11000 1)
Private Const IP_DEST_NET_UNREACHABLE As Long = (11000 2)
Private Const IP_DEST_HOST_UNREACHABLE As Long = (11000 3)
Private Const IP_DEST_PROT_UNREACHABLE As Long = (11000 4)
Private Const IP_DEST_PORT_UNREACHABLE As Long = (11000 5)
Private Const IP_NO_RESOURCES As Long = (11000 6)
Private Const IP_BAD_OPTION As Long = (11000 7)
Private Const IP_HW_ERROR As Long = (11000 8)
Private Const IP_PACKET_TOO_BIG As Long = (11000 9)
Private Const IP_REQ_TIMED_OUT As Long = (11000 10)
Private Const IP_BAD_REQ As Long = (11000 11)
Private Const IP_BAD_ROUTE As Long = (11000 12)
Private Const IP_TTL_EXPIRED_TRANSIT As Long = (11000 13)
Private Const IP_TTL_EXPIRED_REASSEM As Long = (11000 14)
Private Const IP_PARAM_PROBLEM As Long = (11000 15)
Private Const IP_SOURCE_QUENCH As Long = (11000 16)
Private Const IP_OPTION_TOO_BIG As Long = (11000 17)
Private Const IP_BAD_DESTINATION As Long = (11000 18)
Private Const IP_ADDR_DELETED As Long = (11000 19)
Private Const IP_SPEC_MTU_CHANGE As Long = (11000 20)
Private Const IP_MTU_CHANGE As Long = (11000 21)
Private Const IP_UNLOAD As Long = (11000 22)
Private Const IP_ADDR_ADDED As Long = (11000 23)
Private Const IP_GENERAL_FAILURE As Long = (11000 50)
Private Const MAX_IP_STATUS As Long = (11000 50)
Private Const IP_PENDING As Long = (11000 255)
Private Const PING_TIMEOUT As Long = 500
Private Const WS_VERSION_REQD As Long = &H101
Private Const MIN_SOCKETS_REQD As Long = 1
Private Const SOCKET_ERROR As Long = -1
Private Const INADDR_NONE As Long = &HFFFFFFFF
Private Const MAX_WSADescription As Long = 256
Private Const MAX_WSASYSStatus As Long = 128

Private Type ICMP_OPTIONS
Ttl As Byte
Tos As Byte
Flags As Byte
OptionsSize As Byte
OptionsData As Long
End Type

Private Type ICMP_ECHO_REPLY
Address As Long
status As Long
RoundTripTime As Long
DataSize As Long
DataPointer As Long
Options As ICMP_OPTIONS
Data As String * 250
End Type

Private Type WSADATA
wVersion As Integer
wHighVersion As Integer
szDescription(0 To MAX_WSADescription) As Byte
szSystemStatus(0 To MAX_WSASYSStatus) As Byte
wMaxSockets As Long
wMaxUDPDG As Long
dwVendorInfo As Long
End Type

Private Declare Function IcmpCreateFile Lib "icmp.dll" () As Long
Private Declare Function IcmpCloseHandle Lib "icmp.dll" (ByVal IcmpHandle As Long) As Long
Private Declare Function IcmpSendEcho Lib "icmp.dll" (ByVal IcmpHandle As Long, ByVal DestinationAddress As Long, ByVal RequestData As String, ByVal RequestSize As Long, ByVal RequestOptions As Long, ReplyBuffer As ICMP_ECHO_REPLY, ByVal ReplySize As Long, ByVal Timeout As Long) As Long
Private Declare Function WSAGetLastError Lib "wsock32" () As Long
Private Declare Function WSAStartup Lib "wsock32" (ByVal wVersionRequired As Long, lpWSADATA As WSADATA) As Long
Private Declare Function WSACleanup Lib "wsock32" () As Long
Private Declare Function gethostname Lib "wsock32" (ByVal szHost As String, ByVal dwHostLen As Long) As Long
Private Declare Function gethostbyname Lib "wsock32" (ByVal szHost As String) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (xDest As Any, xSource As Any, ByVal nbytes As Long)
Private Declare Function inet_addr Lib "wsock32" (ByVal s As String) As Long

Private Function GetStatusCode(status As Long) As String
On Error GoTo Z
Dim Msg As String
Select Case status
Case IP_SUCCESS: Msg = "ip success"
Case INADDR_NONE: Msg = "inet_addr: bad IP format"
Case IP_BUF_TOO_SMALL: Msg = "ip buf too_small"
Case IP_DEST_NET_UNREACHABLE: Msg = "ip dest net unreachable"
Case IP_DEST_HOST_UNREACHABLE: Msg = "ip dest host unreachable"
Case IP_DEST_PROT_UNREACHABLE: Msg = "ip dest prot unreachable"
Case IP_DEST_PORT_UNREACHABLE: Msg = "ip dest port unreachable"

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