VB如何去判断某个IP是否能ping通？

答案：Option Explicit''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' Copyright ?1996-2009 VBnet, Randy Birch, All Rights Reserved.' Some pages may also contain other copyrights by the author.''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' Distribution: You can freely use this code in your own'               applications, but you may not reproduce '               or publish this code on any web site,'               online service, or distribute as source '               on any media without express permission.''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Private Const IP_SUCCESS As Long = 0Private Const IP_STATUS_BASE As Long = 11000Private 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 = 500Private Const WS_VERSION_REQD As Long = &H101Private Const MIN_SOCKETS_REQD As Long = 1Private Const SOCKET_ERROR As Long = -1Private Const INADDR_NONE As Long = &HFFFFFFFFPrivate Const MAX_WSADescription As Long = 256Private Const MAX_WSASYSStatus As Long = 128Private Type ICMP_OPTIONS    Ttl             As Byte    Tos             As Byte    Flags           As Byte    OptionsSize     As Byte    OptionsData     As LongEnd TypePrivate Type ICMP_ECHO_REPLY    Address         As Long    status          As Long    RoundTripTime   As Long    DataSize        As Long 'formerly integer   'Reserved        As Integer    DataPointer     As Long    Options         As ICMP_OPTIONS    Data            As String * 250End TypePrivate 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 LongEnd TypePrivate Declare Function IcmpCreateFile Lib "icmp.dll" () As LongPrivate 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 LongPrivate Declare Function WSAStartup Lib "wsock32" _   (ByVal wVersionRequired As Long, _    lpWSADATA As WSADATA) As Long    Private Declare Function WSACleanup Lib "wsock32" () As LongPrivate 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 LongPrivate 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 LongPrivate Sub Command1_Click()      Dim ECHO As ICMP_ECHO_REPLY   Dim pos As Long   Dim success As Long      If SocketsInitialize() Then        'ping the IP by passing the address,     'text to send, and the ECHO structure.      success = Ping((Text1.Text), (Text2.Text), ECHO)           'display the results      Text3(0).Text = GetStatusCode(success)      Text3(1).Text = ECHO.Address      Text3(2).Text = ECHO.RoundTripTime & " ms"      Text3(3).Text = ECHO.DataSize & " bytes"            If Left$(ECHO.Data, 1) <> Chr$(0) Then         pos = InStr(ECHO.Data, Chr$(0))         Text3(4).Text = Left$(ECHO.Data, pos - 1)      End If         Text3(5).Text = ECHO.DataPointer            SocketsCleanup         Else           MsgBox "Windows Sockets for 32 bit Windows " & _               "environments is not successfully responding."      End If   End SubPrivate Function Ping(sAddress As String, _                     sDataToSend As String, _                     ECHO As ICMP_ECHO_REPLY) As Long  'If Ping succeeds :  '.RoundTripTime = time in ms for the ping to complete,  '.Data is the data returned (NULL terminated)  '.Address is the Ip address that actually replied  '.DataSize is the size of the string in .Data  '.Status will be 0  '  'If Ping fails .Status will be the error code      Dim hPort As Long   Dim dwAddress As Long     'convert the address into a long representation   dwAddress = inet_addr(sAddress)     'if a valid address..   If dwAddress <> INADDR_NONE Then        'open a port      hPort = IcmpCreateFile()           'and if successful,      If hPort Then              'ping it.         Call IcmpSendEcho(hPort, _                           dwAddress, _                           sDataToSend, _                           Len(sDataToSend), _                           0, _                           ECHO, _                           Len(ECHO), _                           PING_TIMEOUT)        'return the status as ping succes and close         Ping = ECHO.status         Call IcmpCloseHandle(hPort)            End If           Else        'the address format was probably invalid         Ping = INADDR_NONE            End If  End Function   Private Sub SocketsCleanup()      If WSACleanup() <> 0 Then       MsgBox "Windows Sockets error occurred in Cleanup.", vbExclamation   End If    End SubPrivate Function SocketsInitialize() As Boolean   Dim WSAD As WSADATA      SocketsInitialize = WSAStartup(WS_VERSION_REQD, WSAD) = IP_SUCCESS    End FunctionPrivate Function GetStatusCode(status As Long) As String   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"      Case IP_NO_RESOURCES:          msg = "ip no resources"      Case IP_BAD_OPTION:            msg = "ip bad option"      Case IP_HW_ERROR:              msg = "ip hw_error"      Case IP_PACKET_TOO_BIG:        msg = "ip packet too_big"      Case IP_REQ_TIMED_OUT:         msg = "ip req timed out"      Case IP_BAD_REQ:               msg = "ip bad req"      Case IP_BAD_ROUTE:             msg = "ip bad route"      Case IP_TTL_EXPIRED_TRANSIT:   msg = "ip ttl expired transit"      Case IP_TTL_EXPIRED_REASSEM:   msg = "ip ttl expired reassem"      Case IP_PARAM_PROBLEM:         msg = "ip param_problem"      Case IP_SOURCE_QUENCH:         msg = "ip source quench"      Case IP_OPTION_TOO_BIG:
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