VB IGMP (转)

VB IGMP (转)[@more@]

Option Explicit
'*******************IGMP************************
Private Type SockAddr 
  sin_family As Integer
  sin_port As Integer
  sin_addr As String * 4
  sin_zero As String * 8
End Type

Private Type T_WSA 
  wVersion As Integer
  wHighVersion As Integer
  szDescription(0 To 255) As Byte
  szSystemStatus(0 To 128) As Byte
  iMaxSockets As Integer
  iMaxUdpDg As Integer
  lpVendorInfo As Long
End Type

Private Declare Sub CopyMemory Lib "kernel32.dll" Alias "RtlMoveMemory" (Dest As Any, Src As Any, ByVal cb&)
Private Declare Function .NET_addr Lib "wsock32.dll" (ByVal addr As String) As Long
Private Declare Function WSAStartup Lib "wsock32.dll" (ByVal a As Long, b As T_WSA) As Long
Private Declare Function WSACleanUp Lib "wsock32.dll" Alias "WSACleanup" () As Integer
Private Declare Function Socket Lib "wsock32.dll" Alias "socket" (ByVal afinet As Integer, ByVal socktype As Integer, ByVal protocol As Integer) As Long
Private Declare Function ConnectWinsock Lib "wsock32.dll" Alias "connect" (ByVal sock As Long, sockstruct As SockAddr, ByVal structlen As Integer) As Integer
Private Declare Function send Lib "wsock32.dll" (ByVal sock As Long, ByVal msg As String, ByVal msglen As Long, ByVal flag As Integer) As Long
Private Declare Function htons Lib "wsock32.dll" (ByVal a As Integer) As Integer
Private Declare Function closesocket Lib "wsock32.dll" (ByVal sn As Long) As Integer
Private sock As Long
Private t As Long 
Private Sub cmd_Go_Click()
If t > 0 Then
  t = 0
  Else
  Dim addr As SockAddr
  Dim x As Long
  Dim ip As String
  Dim y(0 To 3) As Byte
  ip = ""
  x = inet_addr(txt_IP.Text) 
  CopyMemory y(0), x, 4 
  For x = 0 To 3
  ip = ip & Chr(y(x))
  Next x
  addr.sin_addr = ip
  addr.sin_family = 2
  addr.sin_port = htons(100) 
  addr.sin_zero = String(8, 0)
 
  If ConnectWinsock(sock, addr, Len(addr)) Then 
  MsgBox "connect error"
  Exit Sub
  End If
  t = 10
  Set cmd_Go.Picture = Image1.Picture 
  Timer1.Enabled = True
End If
End Sub
Private Sub Form_Load()
Dim WSAData As T_WSA
Set cmd_Go.Picture = Image2.Picture 
  WSAStartup 514, WSAData 
  sock = Socket(2, 3, 2) 
  If sock < 0 Then
  MsgBox "winsock error"
  Unload Me
  End If
t = 0
End Sub
Private Sub Form_Unload(Cancel As Integer)
closesocket sock
WSACleanUp 
End Sub

Private Sub Timer1_Timer() 
If t Then
  send sock, String(60000, "0"), 60000, 0
  t = t - 1
Else
  Timer1.Enabled = False
  Set cmd_Go.Picture = Image2.Picture
End If
End Sub

 

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转载于:http://blog.itpub.net/10752043/viewspace-987521/