AW: Socketverbindung
19.08.2003 12:40:54
Michael Scheffler
Hi,
aus dem API-Guide:
'This project needs a TextBox
'-> (Name)=Text1
'-> MultiLine=True
'in a form
Private Sub Form_Load()
'KPD-Team 2000
'URL: http://www.allapi.net/
'E-Mail: KPDTeam@Allapi.net
Dim sSave As String
Me.AutoRedraw = True
Set Obj = Me.Text1
'Start subclassing
HookForm Me
'create a new winsock session
StartWinsock sSave
'show the winsock version on this form
If InStr(1, sSave, Chr$(0)) > 0 Then sSave = Left$(sSave, InStr(1, sSave, Chr$(0)) - 1)
Me.Print sSave
'connect to Microsoft.com
lSocket = ConnectSock("www.microsoft.com", 80, 0, Me.hwnd, False)
End Sub
Private Sub Form_Unload(Cancel As Integer)
'close our connection to microsoft.com
closesocket lSocket
'end winsock session
EndWinsock
'stop subclassing
UnHookForm Me
End Sub
'in a module
Public Const AF_INET = 2
Public Const INVALID_SOCKET = -1
Public Const SOCKET_ERROR = -1
Public Const FD_READ = &H1&
Public Const FD_WRITE = &H2&
Public Const FD_CONNECT = &H10&
Public Const FD_CLOSE = &H20&
Public Const PF_INET = 2
Public Const SOCK_STREAM = 1
Public Const IPPROTO_TCP = 6
Public Const GWL_WNDPROC = (-4)
Public Const WINSOCKMSG = 1025
Public Const WSA_DESCRIPTIONLEN = 256
Public Const WSA_DescriptionSize = WSA_DESCRIPTIONLEN + 1
Public Const WSA_SYS_STATUS_LEN = 128
Public Const WSA_SysStatusSize = WSA_SYS_STATUS_LEN + 1
Public Const INADDR_NONE = &HFFFF
Public Const SOL_SOCKET = &HFFFF&
Public Const SO_LINGER = &H80&
Public Const hostent_size = 16
Public Const sockaddr_size = 16
Type WSADataType
wVersion As Integer
wHighVersion As Integer
szDescription As String * WSA_DescriptionSize
szSystemStatus As String * WSA_SysStatusSize
iMaxSockets As Integer
iMaxUdpDg As Integer
lpVendorInfo As Long
End Type
Type HostEnt
h_name As Long
h_aliases As Long
h_addrtype As Integer
h_length As Integer
h_addr_list As Long
End Type
Type sockaddr
sin_family As Integer
sin_port As Integer
sin_addr As Long
sin_zero As String * 8
End Type
Type LingerType
l_onoff As Integer
l_linger As Integer
End Type
Public Declare Function setsockopt Lib "wsock32.dll" (ByVal s As Long, ByVal Level As Long, ByVal optname As Long, optval As Any, ByVal optlen As Long) As Long
Public Declare Function getsockopt Lib "wsock32.dll" (ByVal s As Long, ByVal Level As Long, ByVal optname As Long, optval As Any, optlen As Long) As Long
Public Declare Function WSAGetLastError Lib "wsock32.dll" () As Long
Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Public Declare Function WSAIsBlocking Lib "wsock32.dll" () As Long
Public Declare Function WSACleanup Lib "wsock32.dll" () As Long
Public Declare Function Send Lib "wsock32.dll" Alias "send" (ByVal s As Long, buf As Any, ByVal buflen As Long, ByVal flags As Long) As Long
Public Declare Function recv Lib "wsock32.dll" (ByVal s As Long, buf As Any, ByVal buflen As Long, ByVal flags As Long) As Long
Public Declare Function WSAStartup Lib "wsock32.dll" (ByVal wVR As Long, lpWSAD As WSADataType) As Long
Public Declare Function htons Lib "wsock32.dll" (ByVal hostshort As Long) As Integer
Public Declare Function ntohs Lib "wsock32.dll" (ByVal netshort As Long) As Integer
Public Declare Function socket Lib "wsock32.dll" (ByVal af As Long, ByVal s_type As Long, ByVal protocol As Long) As Long
Public Declare Function closesocket Lib "wsock32.dll" (ByVal s As Long) As Long
Public Declare Function Connect Lib "wsock32.dll" Alias "connect" (ByVal s As Long, addr As sockaddr, ByVal namelen As Long) As Long
Public Declare Function WSAAsyncSelect Lib "wsock32.dll" (ByVal s As Long, ByVal hwnd As Long, ByVal wMsg As Long, ByVal lEvent As Long) As Long
Public Declare Function inet_addr Lib "wsock32.dll" (ByVal cp As String) As Long
Public Declare Function gethostbyname Lib "wsock32.dll" (ByVal host_name As String) As Long
Public Declare Sub MemCopy Lib "kernel32" Alias "RtlMoveMemory" (Dest As Any, Src As Any, ByVal cb&)
Public Declare Function inet_ntoa Lib "wsock32.dll" (ByVal inn As Long) As Long
Public Declare Function lstrlen Lib "kernel32" Alias "lstrlenA" (ByVal lpString As Any) As Long
Public Declare Function WSACancelBlockingCall Lib "wsock32.dll" () As Long
Public saZero As sockaddr
Public WSAStartedUp As Boolean, Obj As TextBox
Public PrevProc As Long, lSocket As Long
'subclassing functions
'for more information about subclassing,
'check out the subclassing tutorial at http://www.allapi.net/
Public Sub HookForm(F As Form)
PrevProc = SetWindowLong(F.hwnd, GWL_WNDPROC, AddressOf WindowProc)
End Sub
Public Sub UnHookForm(F As Form)
If PrevProc <> 0 Then
SetWindowLong F.hwnd, GWL_WNDPROC, PrevProc
PrevProc = 0
End If
End Sub
Public Function WindowProc(ByVal hwnd As Long, ByVal uMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
If uMsg = WINSOCKMSG Then
ProcessMessage wParam, lParam
Else
WindowProc = CallWindowProc(PrevProc, hwnd, uMsg, wParam, lParam)
End If
End Function
'our Winsock-message handler
Public Sub ProcessMessage(ByVal lFromSocket As Long, ByVal lParam As Long)
Dim X As Long, ReadBuffer(1 To 1024) As Byte, strCommand As String
Select Case lParam
Case FD_CONNECT 'we are connected to microsoft.com
Case FD_WRITE 'we can write to our connection
'this is a part of the HTTP protocol
'for more information about this protocol, visit http://www.w3c.org/
strCommand = "GET http://www.microsoft.com/ HTTP/1.0" + vbCrLf
strcomand = strCommand + "Pragma: no-cache" + vbCrLf
strCommand = strCommand + "Accept: */*" + vbCrLf
strCommand = strCommand + "Accept: text/html" + vbCrLf + vbCrLf
'send the data to our microsoft.com-connection
SendData lFromSocket, strCommand
Case FD_READ 'we have data waiting to be processed
'start reading the data
Do
X = recv(lFromSocket, ReadBuffer(1), 1024, 0)
If X > 0 Then
Obj.Text = Obj.Text + Left$(StrConv(ReadBuffer, vbUnicode), X)
End If
If X <> 1024 Then Exit Do
Loop
Case FD_CLOSE 'the connection with microsoft.com is closed
End Select
End Sub
'the following functions are standard WinSock functions
'from the wsksock.bas-file
Public Function StartWinsock(sDescription As String) As Boolean
Dim StartupData As WSADataType
If Not WSAStartedUp Then
If Not WSAStartup(&H101, StartupData) Then
WSAStartedUp = True
sDescription = StartupData.szDescription
Else
WSAStartedUp = False
End If
End If
StartWinsock = WSAStartedUp
End Function
Sub EndWinsock()
Dim Ret&
If WSAIsBlocking() Then
Ret = WSACancelBlockingCall()
End If
Ret = WSACleanup()
WSAStartedUp = False
End Sub
Public Function SendData(ByVal s&, vMessage As Variant) As Long
Dim TheMsg() As Byte, sTemp$
TheMsg = ""
Select Case VarType(vMessage)
Case 8209 'byte array
sTemp = vMessage
TheMsg = sTemp
Case 8 'string, if we recieve a string, its assumed we are linemode
sTemp = StrConv(vMessage, vbFromUnicode)
Case Else
sTemp = CStr(vMessage)
sTemp = StrConv(vMessage, vbFromUnicode)
End Select
TheMsg = sTemp
If UBound(TheMsg) > -1 Then
SendData = Send(s, TheMsg(0), (UBound(TheMsg) - LBound(TheMsg) + 1), 0)
End If
End Function
Function ConnectSock(ByVal Host$, ByVal Port&, retIpPort$, ByVal HWndToMsg&, ByVal Async%) As Long
Dim s&, SelectOps&, Dummy&
Dim sockin As sockaddr
SockReadBuffer$ = ""
sockin = saZero
sockin.sin_family = AF_INET
sockin.sin_port = htons(Port)
If sockin.sin_port = INVALID_SOCKET Then
ConnectSock = INVALID_SOCKET
Exit Function
End If
sockin.sin_addr = GetHostByNameAlias(Host$)
If sockin.sin_addr = INADDR_NONE Then
ConnectSock = INVALID_SOCKET
Exit Function
End If
retIpPort$ = getascip$(sockin.sin_addr) & ":" & ntohs(sockin.sin_port)
s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)
If s < 0 Then
ConnectSock = INVALID_SOCKET
Exit Function
End If
If SetSockLinger(s, 1, 0) = SOCKET_ERROR Then
If s > 0 Then
Dummy = closesocket(s)
End If
ConnectSock = INVALID_SOCKET
Exit Function
End If
If Not Async Then
If Connect(s, sockin, sockaddr_size) <> 0 Then
If s > 0 Then
Dummy = closesocket(s)
End If
ConnectSock = INVALID_SOCKET
Exit Function
End If
SelectOps = FD_READ Or FD_WRITE Or FD_CONNECT Or FD_CLOSE
If WSAAsyncSelect(s, HWndToMsg, ByVal 1025, ByVal SelectOps) Then
If s > 0 Then
Dummy = closesocket(s)
End If
ConnectSock = INVALID_SOCKET
Exit Function
End If
Else
SelectOps = FD_READ Or FD_WRITE Or FD_CONNECT Or FD_CLOSE
If WSAAsyncSelect(s, HWndToMsg, ByVal 1025, ByVal SelectOps) Then
If s > 0 Then
Dummy = closesocket(s)
End If
ConnectSock = INVALID_SOCKET
Exit Function
End If
If Connect(s, sockin, sockaddr_size) <> -1 Then
If s > 0 Then
Dummy = closesocket(s)
End If
ConnectSock = INVALID_SOCKET
Exit Function
End If
End If
ConnectSock = s
End Function
Function GetHostByNameAlias(ByVal hostname$) As Long
On Error Resume Next
Dim phe&
Dim heDestHost As HostEnt
Dim addrList&
Dim retIP&
retIP = inet_addr(hostname)
If retIP = INADDR_NONE Then
phe = gethostbyname(hostname)
If phe <> 0 Then
MemCopy heDestHost, ByVal phe, hostent_size
MemCopy addrList, ByVal heDestHost.h_addr_list, 4
MemCopy retIP, ByVal addrList, heDestHost.h_length
Else
retIP = INADDR_NONE
End If
End If
GetHostByNameAlias = retIP
If Err Then GetHostByNameAlias = INADDR_NONE
End Function
Function getascip(ByVal inn As Long) As String
On Error Resume Next
Dim lpStr&
Dim nStr&
Dim retString$
retString = String(32, 0)
lpStr = inet_ntoa(inn)
If lpStr = 0 Then
getascip = "255.255.255.255"
Exit Function
End If
nStr = lstrlen(lpStr)
If nStr > 32 Then nStr = 32
MemCopy ByVal retString, ByVal lpStr, nStr
retString = Left(retString, nStr)
getascip = retString
If Err Then getascip = "255.255.255.255"
End Function
Public Function SetSockLinger(ByVal SockNum&, ByVal OnOff%, ByVal LingerTime%) As Long
Dim Linger As LingerType
Linger.l_onoff = OnOff
Linger.l_linger = LingerTime
If setsockopt(SockNum, SOL_SOCKET, SO_LINGER, Linger, 4) Then
Debug.Print "Error setting linger info: " & WSAGetLastError()
SetSockLinger = SOCKET_ERROR
Else
If getsockopt(SockNum, SOL_SOCKET, SO_LINGER, Linger, 4) Then
Debug.Print "Error getting linger info: " & WSAGetLastError()
SetSockLinger = SOCKET_ERROR
End If
End If
End Function