Private Declare Sub CopyMemory Lib "kernel32" _ Alias "RtlMoveMemory" _ (xDest As Any, _ xSource As Any, _ ByVal nbytes As Long)Private Declare Function lstrlenA Lib "kernel32" _ (lpString As Any) 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 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 inet_addr Lib "wsock32" _ (ByVal s As String) As Long
Public 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 dwAddress is valid 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 success Ping = ECHO.status 'close the port handle Call IcmpCloseHandle(hPort)
End If 'If hPort
Else:
'the address format was probably invalid Ping = INADDR_NONE
End If
End Function Public 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: msg = "ip option too_big" Case IP_BAD_DESTINATION: msg = "ip bad destination" Case IP_ADDR_DELETED: msg = "ip addr deleted" Case IP_SPEC_MTU_CHANGE: msg = "ip spec mtu change" Case IP_MTU_CHANGE: msg = "ip mtu_change" Case IP_UNLOAD: msg = "ip unload" Case IP_ADDR_ADDED: msg = "ip addr added" Case IP_GENERAL_FAILURE: msg = "ip general failure" Case IP_PENDING: msg = "ip pending" Case PING_TIMEOUT: msg = "ping timeout" Case Else: msg = "unknown msg returned" End Select
GetStatusCode = CStr(status) & " [ " & msg & " ]"
End Function Public Function GetIPFromHostName(ByVal sHostName As String) As String 'converts a host name to an IP address. Dim nbytes As Long Dim ptrHosent As Long 'address of hostent structure Dim ptrName As Long 'address of name pointer Dim ptrAddress As Long 'address of address pointer Dim ptrIPAddress As Long Dim sAddress As String
sAddress = Space$(4) ptrHosent = gethostbyname(sHostName & vbNullChar) If ptrHosent <> 0 Then 'assign pointer addresses and offset
'ptrName is the official name of the host (PC). 'If using the DNS or similar resolution system, 'it is the Fully Qualified Domain Name (FQDN) 'that caused the server to return a reply. 'If using a local hosts file, it is the first 'entry after the IP address. ptrName = ptrHosent
'Null-terminated list of addresses for the host. 'The Address is offset 12 bytes from the start of 'the HOSENT structure. Note: Here we are retrieving 'only the first address returned. To return more than 'one, define sAddress as a string array and loop through 'the 4-byte ptrIPAddress members returned. The last 'item is a terminating null. All addresses are returned 'in network byte order. ptrAddress = ptrHosent + 12
'get the IP address CopyMemory ptrName, ByVal ptrName, 4 CopyMemory ptrAddress, ByVal ptrAddress, 4 CopyMemory ptrIPAddress, ByVal ptrAddress, 4 CopyMemory ByVal sAddress, ByVal ptrIPAddress, 4 GetIPFromHostName = IPToText(sAddress) End If
End Function Private Function IPToText(ByVal IPAddress As String) As String IPToText = CStr(Asc(IPAddress)) & "." & _ CStr(Asc(Mid$(IPAddress, 2, 1))) & "." & _ CStr(Asc(Mid$(IPAddress, 3, 1))) & "." & _ CStr(Asc(Mid$(IPAddress, 4, 1)))
End Function Public Sub SocketsCleanup()
If WSACleanup() <> 0 Then MsgBox "Windows Sockets error occurred in Cleanup.", vbExclamation End If
End Sub Public Function SocketsInitialize() As Boolean Dim WSAD As WSADATA
里面有一个函数：GetIPFromHostName。
多线程的太麻烦，我看还是算了吧。不过网上也有一些源代码，你可以看看。
代码很长，分几个帖子贴。Option Explicit
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' Copyright ©1996-2002 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 many 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_STATUS_BASE As Long = 11000
Private Const IP_SUCCESS As Long = 0
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 = 128Private 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 TypePrivate Type ICMP_OPTIONS
Ttl As Byte
Tos As Byte
Flags As Byte
OptionsSize As Byte
OptionsData As Long
End TypePublic Type ICMP_ECHO_REPLY
Address As Long
status As Long
RoundTripTime As Long
DataSize As Long
'Reserved As Integer
DataPointer As Long
Options As ICMP_OPTIONS
Data As String * 250
End TypePrivate Type HOSTENT
hName As Long
hAliases As Long
hAddrType As Integer
hLen As Integer
hAddrList As Long
End TypePrivate Declare Function gethostbyname Lib "wsock32" _
(ByVal hostname 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 lstrlenA Lib "kernel32" _
(lpString As Any) 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 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 inet_addr Lib "wsock32" _
(ByVal s As String) As Long
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 dwAddress is valid
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 success
Ping = ECHO.status 'close the port handle
Call IcmpCloseHandle(hPort)
End If 'If hPort
Else:
'the address format was probably invalid
Ping = INADDR_NONE
End If
End Function
Public 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: msg = "ip option too_big"
Case IP_BAD_DESTINATION: msg = "ip bad destination"
Case IP_ADDR_DELETED: msg = "ip addr deleted"
Case IP_SPEC_MTU_CHANGE: msg = "ip spec mtu change"
Case IP_MTU_CHANGE: msg = "ip mtu_change"
Case IP_UNLOAD: msg = "ip unload"
Case IP_ADDR_ADDED: msg = "ip addr added"
Case IP_GENERAL_FAILURE: msg = "ip general failure"
Case IP_PENDING: msg = "ip pending"
Case PING_TIMEOUT: msg = "ping timeout"
Case Else: msg = "unknown msg returned"
End Select
GetStatusCode = CStr(status) & " [ " & msg & " ]"
End Function
Public Function GetIPFromHostName(ByVal sHostName As String) As String 'converts a host name to an IP address. Dim nbytes As Long
Dim ptrHosent As Long 'address of hostent structure
Dim ptrName As Long 'address of name pointer
Dim ptrAddress As Long 'address of address pointer
Dim ptrIPAddress As Long
Dim sAddress As String
sAddress = Space$(4) ptrHosent = gethostbyname(sHostName & vbNullChar) If ptrHosent <> 0 Then 'assign pointer addresses and offset
'ptrName is the official name of the host (PC).
'If using the DNS or similar resolution system,
'it is the Fully Qualified Domain Name (FQDN)
'that caused the server to return a reply.
'If using a local hosts file, it is the first
'entry after the IP address.
ptrName = ptrHosent
'Null-terminated list of addresses for the host.
'The Address is offset 12 bytes from the start of
'the HOSENT structure. Note: Here we are retrieving
'only the first address returned. To return more than
'one, define sAddress as a string array and loop through
'the 4-byte ptrIPAddress members returned. The last
'item is a terminating null. All addresses are returned
'in network byte order.
ptrAddress = ptrHosent + 12
'get the IP address
CopyMemory ptrName, ByVal ptrName, 4
CopyMemory ptrAddress, ByVal ptrAddress, 4
CopyMemory ptrIPAddress, ByVal ptrAddress, 4
CopyMemory ByVal sAddress, ByVal ptrIPAddress, 4 GetIPFromHostName = IPToText(sAddress) End If
End Function
Private Function IPToText(ByVal IPAddress As String) As String IPToText = CStr(Asc(IPAddress)) & "." & _
CStr(Asc(Mid$(IPAddress, 2, 1))) & "." & _
CStr(Asc(Mid$(IPAddress, 3, 1))) & "." & _
CStr(Asc(Mid$(IPAddress, 4, 1)))
End Function
Public Sub SocketsCleanup()
If WSACleanup() <> 0 Then
MsgBox "Windows Sockets error occurred in Cleanup.", vbExclamation
End If
End Sub
Public Function SocketsInitialize() As Boolean Dim WSAD As WSADATA
SocketsInitialize = WSAStartup(WS_VERSION_REQD, WSAD) = IP_SUCCESS
End Function