Bin ein Stück weiter, aber noch nicht am Ziel
09.06.2011 00:36:16
Martin
Hallo alle zusammen!
nach langen Recherchen im Internet bin ich ein Stück weiter. Über Winsock API kann über das Netzwerk kommuniziert werden. Dazu muss folgende Datei im Windows-Verzeichnis enthalten sein: https://www.herber.de/bbs/user/75228.zip
Mit folgendem Code ist es mir gelungen die Netzwerkverbindung zu meinem Messgerät aufzubauen und Steuerbefehle zu senden (Messvorgang ein- und ausschalten), aber leider konnte ich noch keine Daten empfangen. Wer kann helfen?
'This is the Winsock API definition file for Visual Basic
'Setup the variable type 'hostent' for the WSAStartup command
Type Hostent
h_name As Long
h_aliases As Long
h_addrtype As String * 2
h_length As String * 2
h_addr_list As Long
End Type
Public Const SZHOSTENT = 16
'Set the Internet address type to a long integer (32-bit)
Type in_addr
s_addr As Long
End Type
'A note to those familiar with the C header file for Winsock
'Visual Basic does not permit a user-defined variable type
'to be used as a return structure. In the case of the
'variable definition below, sin_addr must
'be declared as a long integer rather than the user-defined
'variable type of in_addr.
Type sockaddr_in
sin_family As Integer
sin_port As Integer
sin_addr As Long
sin_zero As String * 8
End Type
Public Const WSADESCRIPTION_LEN = 256
Public Const WSASYS_STATUS_LEN = 128
Public Const WSA_DescriptionSize = WSADESCRIPTION_LEN + 1
Public Const WSA_SysStatusSize = WSASYS_STATUS_LEN + 1
'Setup the structure for the information returned from
'the WSAStartup() function.
Type WSAData
wVersion As Integer
wHighVersion As Integer
szDescription As String * WSA_DescriptionSize
szSystemStatus As String * WSA_SysStatusSize
iMaxSockets As Integer
iMaxUdpDg As Integer
lpVendorInfo As String * 200
End Type
'Define socket return codes
Public Const INVALID_SOCKET = &HFFFF
Public Const SOCKET_ERROR = -1
'Define socket types
Public Const SOCK_STREAM = 1 'Stream socket
Public Const SOCK_DGRAM = 2 'Datagram socket
Public Const SOCK_RAW = 3 'Raw data socket
Public Const SOCK_RDM = 4 'Reliable Delivery socket
Public Const SOCK_SEQPACKET = 5 'Sequenced Packet socket
'Define address families
Public Const AF_UNSPEC = 0 'unspecified
Public Const AF_UNIX = 1 'local to host (pipes, portals)
Public Const AF_INET = 2 'internetwork: UDP, TCP, etc.
Public Const AF_IMPLINK = 3 'arpanet imp addresses
Public Const AF_PUP = 4 'pup protocols: e.g. BSP
Public Const AF_CHAOS = 5 'mit CHAOS protocols
Public Const AF_NS = 6 'XEROX NS protocols
Public Const AF_ISO = 7 'ISO protocols
Public Const AF_OSI = AF_ISO 'OSI is ISO
Public Const AF_ECMA = 8 'european computer manufacturers
Public Const AF_DATAKIT = 9 'datakit protocols
Public Const AF_CCITT = 10 'CCITT protocols, X.25 etc
Public Const AF_SNA = 11 'IBM SNA
Public Const AF_DECnet = 12 'DECnet
Public Const AF_DLI = 13 'Direct data link interface
Public Const AF_LAT = 14 'LAT
Public Const AF_HYLINK = 15 'NSC Hyperchannel
Public Const AF_APPLETALK = 16 'AppleTalk
Public Const AF_NETBIOS = 17 'NetBios-style addresses
Public Const AF_MAX = 18 'Maximum # of address families
'Setup sockaddr data type to store Internet addresses
Type sockaddr
sa_family As Integer
sa_data As String * 14
End Type
Public Const SADDRLEN = 16
'Declare Socket functions
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_in, ByVal namelen As Long) As Long
Public Declare Function htons Lib "wsock32.dll" (ByVal hostshort As Long) As Integer
Public Declare Function inet_addr Lib "wsock32.dll" (ByVal cp As String) As Long
Public Declare Function recv Lib "wsock32.dll" (ByVal s As Long, ByVal buf As Any, ByVal buflen _
As Long, ByVal flags As Long) As Long
Public Declare Function recvB Lib "wsock32.dll" Alias "recv" (ByVal s As Long, buf As Any, _
ByVal buflen As Long, ByVal flags As Long) 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 socket Lib "wsock32.dll" (ByVal af As Long, ByVal socktype As Long, _
ByVal protocol As Long) As Long
Public Declare Function WSAStartup Lib "wsock32.dll" (ByVal wVersionRequired As Long, lpWSAData _
As WSAData) As Long
Public Declare Function WSACleanup Lib "wsock32.dll" () As Long
Public Declare Function WSAUnhookBlockingHook Lib "wsock32.dll" () As Long
Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (hpvDest As Any, hpvSource _
As Any, ByVal cbCopy As Long)
Public socketId
Public Function ConnectServer(ByVal Hostname As String, ByVal PortNumber As Integer) As Integer
Dim StartUpInfo As WSAData
'Version 1.1 (1*256 + 1) = 257
'version 2.0 (2*256 + 0) = 512
'Get WinSock version
'Initialize Winsock DLL
x = WSAStartup(257, StartUpInfo)
Dim I_SocketAddress As sockaddr_in
Dim ipAddress As Long
ipAddress = inet_addr(Hostname) '...........(1)
'Create a new socket
socketId = socket(AF_INET, SOCK_STREAM, 0) '
If socketId = SOCKET_ERROR Then '
MsgBox ("ERROR: socket = " + Str$(socketId)) '...........(2)
OpenSocket = COMMAND_ERROR '
GoTo end1
End If '
'Open a connection to a server
I_SocketAddress.sin_family = AF_INET '
I_SocketAddress.sin_port = htons(PortNumber) '...........(3)
I_SocketAddress.sin_addr = ipAddress '
I_SocketAddress.sin_zero = String$(8, 0) '
x = Connect(socketId, I_SocketAddress, Len(I_SocketAddress)) '
If socketId = SOCKET_ERROR Then '
MsgBox ("ERROR: connect = " + Str$(x)) '..(4)
OpenSocket = COMMAND_ERROR '
Else
OpenSocket = socketId
End If
end1:
End Function
Public Function RecData(dataBuf As String, ByVal maxLength As Integer) As Integer
Dim c As String * 1
Dim length As Integer
dataBuf = ""
While length
Folgende interessante Seiten habe ich zu Excel und Lan gefunden:
http://cp.literature.agilent.com/litweb/pdf/16000-95012.pdf
http://www.vbarchiv.net/api/api_connect.html
http://www.ostrosoft.com/oswinsck/oswinsck_vba.asp
