怎么样通过VB实现ping指定IP？

Option Explicit
'用于网络不通时先判断网络状态,免得网络不通而导致数据库连接状态检查时间较长带来的麻烦
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.DLL" () As Long
Private Declare Function WSAStartup Lib "WSOCK32.DLL" (ByVal wVersionRequired As Long, lpWSADATA As WSADATA) As Long
Private Declare Function WSACleanup Lib "WSOCK32.DLL" () As Long

' ICMP返回的报文信息常数和Winsock版本等相关 常数
Private Const IP_STATUS_BASE = 11000
Private Const IP_SUCCESS = 0
Private Const IP_BUF_TOO_SMALL = (11000 + 1)
Private Const IP_DEST_NET_UNREACHABLE = (11000 + 2)
Private Const IP_DEST_HOST_UNREACHABLE = (11000 + 3)
Private Const IP_DEST_PROT_UNREACHABLE = (11000 + 4)
Private Const IP_DEST_PORT_UNREACHABLE = (11000 + 5)
Private Const IP_NO_RESOURCES = (11000 + 6)
Private Const IP_BAD_OPTION = (11000 + 7)
Private Const IP_HW_ERROR = (11000 + 8)
Private Const IP_PACKET_TOO_BIG = (11000 + 9)
Private Const IP_REQ_TIMED_OUT = (11000 + 10)
Private Const IP_BAD_REQ = (11000 + 11)
Private Const IP_BAD_ROUTE = (11000 + 12)
Private Const IP_TTL_EXPIRED_TRANSIT = (11000 + 13)
Private Const IP_TTL_EXPIRED_REASSEM = (11000 + 14)
Private Const IP_PARAM_PROBLEM = (11000 + 15)
Private Const IP_SOURCE_QUENCH = (11000 + 16)
Private Const IP_OPTION_TOO_BIG = (11000 + 17)
Private Const IP_BAD_DESTINATION = (11000 + 18)
Private Const IP_ADDR_DELETED = (11000 + 19)
Private Const IP_SPEC_MTU_CHANGE = (11000 + 20)
Private Const IP_MTU_CHANGE = (11000 + 21)
Private Const IP_UNLOAD = (11000 + 22)
Private Const IP_ADDR_ADDED = (11000 + 23)
Private Const IP_GENERAL_FAILURE = (11000 + 50)
Private Const MAX_IP_STATUS = 11000 + 50
Private Const IP_PENDING = (11000 + 255)
Private Const PING_TIMEOUT = 200
Private Const WS_VERSION_REQD = &H101
Private Const WS_VERSION_MAJOR = WS_VERSION_REQD / &H100 And &HFF&
Private Const WS_VERSION_MINOR = WS_VERSION_REQD And &HFF&
Private Const MIN_SOCKETS_REQD = 1
Private Const SOCKET_ERROR = -1
Private Const MAX_WSADescription = 256
Private Const MAX_WSASYSStatus = 128

' ICMP选项结构
Private Type ICMP_OPTIONS
Ttl As Byte
Tos As Byte
Flags As Byte
OptionsSize As Byte
OptionsData As Long
End Type

' ICMP应答结构
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

' 存放Winsock版本等信息的结构
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

Dim ICMPOPT As ICMP_OPTIONS

' 返回
Private Function GetStatusCode(status As Long) As String
Dim msg As String
Select Case status
Case IP_SUCCESS: msg = "ip success"
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
' 获得一个整数的高位字节
Private Function HiByte(ByVal wParam As Long) As Integer
HiByte = wParam / &H100 And &HFF&
End Function
'获得一个整数的低位字节
Private Function LoByte(ByVal wParam As Long) As Integer
LoByte = wParam And &HFF&
End Function

' Ping一个IP地址
Private Function Ping(szAddress As String, ECHO As ICMP_ECHO_REPLY) As Long
Dim hPort As Long
Dim dwAddress As Long
Dim sDataToSend As String
Dim iOpt As Long
sDataToSend = "Echo This"
dwAddress = AddressStringToLong(szAddress)
hPort = IcmpCreateFile()
If IcmpSendEcho(hPort, dwAddress, sDataToSend, Len(sDataToSend), 0, ECHO, Len(ECHO), PING_TIMEOUT) Then
'如果ping成功,返回状态0
Ping = ECHO.RoundTripTime
Else
Ping = ECHO.status * -1
End If
Call IcmpCloseHandle(hPort)
End Function

' 将文本框中的IP地址转换成系统识别的长整数形式
Function AddressStringToLong(ByVal tmp As String) As Long
Dim i As Integer
Dim parts(1 To 4) As String
i = 0
'转换IP地址
While InStr(tmp, ".") > 0
i = i + 1
parts(i) = Mid(tmp, 1, InStr(tmp, ".") - 1)
tmp = Mid(tmp, InStr(tmp, ".") + 1)
Wend
i = i + 1
parts(i) = tmp
If i <> 4 Then
AddressStringToLong = 0
Exit Function
End If
AddressStringToLong = Val("&H" & Right("00" & Hex(parts(4)), 2) & Right("00" & Hex(parts(3)), 2) & Right("00" & Hex(parts(2)), 2) & Right("00" & Hex(parts(1)), 2))
End Function

' 初始化Socket
Private Function SocketsInitialize() As Boolean
Dim WSAD As WSADATA
Dim x As Integer
Dim szLoByte As String
Dim szHiByte As String
Dim szBuf As String

'初始化Socket
x = WSAStartup(WS_VERSION_REQD, WSAD)
If x <> 0 Then
'MsgBox "Windows Sockets for 32 bit Windows " & "environments is not successfully responding."
Exit Function
End If

' 判断是否有支持足够的Socket
If LoByte(WSAD.wVersion) < WS_VERSION_MAJOR Or (LoByte(WSAD.wVersion) = WS_VERSION_MAJOR And HiByte(WSAD.wVersion) < WS_VERSION_MINOR) Then
szHiByte = Trim$(Str$(HiByte(WSAD.wVersion)))
szLoByte = Trim$(Str$(LoByte(WSAD.wVersion)))
szBuf = "Windows Sockets Version " & szLoByte & "." & szHiByte
szBuf = szBuf & " is not supported by Windows " & "Sockets for 32 bit Windows environments."
'MsgBox szBuf, vbExclamation
Exit Function
End If

' 判断Winsock的版本是否被32位的Winsock支持
If WSAD.wMaxSockets < MIN_SOCKETS_REQD Then
szBuf = "This application requires a minimum of " & Trim$(Str$(MIN_SOCKETS_REQD)) & " supported sockets."
'MsgBox szBuf, vbExclamation
Exit Function
End If
SocketsInitialize = True
End Function

' 关闭Sockets
Private Sub SocketsCleanup()
Dim x As Long
'关闭Sockets
x = WSACleanup()
If x <> 0 Then
MsgBox "Windows Sockets error " & Trim$(Str$(x)) & " occurred in Cleanup.", vbExclamation
End If
End Sub

Public Function Ping_IP(IPStr As String) As Long
'0-成功;1-错误IP(继续访问数据库);2-Ping不通
Ping_IP = 1
If Trim(IPStr) = "" Then Exit Function
Dim ECHO As ICMP_ECHO_REPLY
Dim pos As Integer
If SocketsInitialize() Then
'ping地址
Call Ping(IPStr, ECHO)
'显示ping结果
Select Case ECHO.status
Case IP_SUCCESS:
Ping_IP = 0
Case IP_BAD_DESTINATION:
Ping_IP = 1
Case Else:
Ping_IP = 2
End Select
SocketsCleanup
End If
End Function