vb.net socket 通过主机名而非IP连接局域网主机

以下代码可以根据主机名获取IP，至于扫描局域网的主机名和ip，建议多去逛逛csdn。

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Dim hostInfo As IPHostEntry

Dim address As Net.IPAddress()

hostInfo = Dns.GetHostEntry("ZHH") ‘ZHH即主机名

address = hostInfo.AddressList

Dim index As Integer

For index = 0 To address.Length - 1

MsgBox(address(index).ToString)

Next index

怎样在VB.net中获得ping命令的结果

首先添加一模块，代码如下

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

Public PingTime As Long

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

Public Declare Function timeGetTime Lib "winmm.dll" () 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 IcmpCreateFile Lib "icmp.dll" () As Long

Private Declare Function inet_addr Lib "wsock32" (ByVal s As String) 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 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 Function GetStatusCode(status As Long) As String

On Error GoTo ErrLine

Dim Msg As String

GetStatusCode = ""

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 port 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 = Msg

Exit Function

ErrLine:

End Function

Private Function Ping(sAddress As String, sDataToSend As String, ECHO As ICMP_ECHO_REPLY) As Long

On Error GoTo ErrLine

Dim hPort As Long

Dim dwAddress As Long

dwAddress = inet_addr(sAddress)

If dwAddress INADDR_NONE Then

hPort = IcmpCreateFile()

If hPort Then

Call IcmpSendEcho(hPort, dwAddress, sDataToSend, Len(sDataToSend), 0, ECHO, Len(ECHO), PING_TIMEOUT)

Ping = ECHO.status

Call IcmpCloseHandle(hPort)

End If

Else

Ping = INADDR_NONE

End If

Exit Function

ErrLine:

Ping = INADDR_NONE

End Function

Public Function PingIP(ByVal szIp As String) As Boolean

On Error GoTo ErrLine

Dim WSAD As WSADATA

Dim ECHO As ICMP_ECHO_REPLY

Dim ret As Long

'Delay 150

PingIP = False

PingTime = Empty

If WSAStartup(WS_VERSION_REQD, WSAD) = IP_SUCCESS Then

ret = Ping(Trim(szIp), "tanaya", ECHO)

PingTime = ECHO.RoundTripTime

If InStr(1, GetStatusCode(ret), "success") 0 Then

WSACleanup

PingIP = True

PingTime = ECHO.RoundTripTime

Exit Function

End If

End If

Exit Function

ErrLine:

End Function

然后建立一窗体，一command

Private Sub Command1_Click()

If PingIP("你需要访问的ip") = True Then

'你自己增加需要执行的代码

else

'增加不联网时需要执行的代码

end if

vb.net 怎样用UDP 协议 写一个聊天程序啊？如图

'xiansr.2014/2/7 vb.net2010 调试通过

Imports System.Net

Imports System.Net.Sockets

Imports System.Text

Public Class Form1

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click

Dim udpClient As New UdpClient(11000)

Try

udpClient.Connect("127.0.0.1", 11000)

Dim sendBytes As [Byte]() = Encoding.ASCII.GetBytes(RichTextBox1.Text)

udpClient.Send(sendBytes, sendBytes.Length)

Dim RemoteIpEndPoint As New IPEndPoint(IPAddress.Any, 0)

Dim receiveBytes As [Byte]() = udpClient.Receive(RemoteIpEndPoint)

Dim returnData As String = Encoding.ASCII.GetString(receiveBytes)

RichTextBox2.Text = "接收到： " + returnData.ToString()

'Debug.Print(("This message was sent from " + RemoteIpEndPoint.Address.ToString() + " on their port number " + RemoteIpEndPoint.Port.ToString()))

udpClient.Close()

Catch ex As Exception

stop

End Try

End Sub

End Class

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