我正在尝试在VBA中使用WinSock2来发送（以及稍后接收）来自localhost TCP Stream的数据。
目前，我一直在尝试从此处复制客户端示例，https://msdn.microsoft.com/en-us/library/windows/desktop/ms738630(v=vs.85).aspx
我的代码“几乎”有效;我可以创建一个socket＆amp;建立与我的服务器的连接。 发送数据（例如调用ws2_32.dll的send（）函数）是奇怪的，但是..
在下面的示例中，服务器确实会收到长度为10的字节数组，但其内容为奇数。数组的前4个字节已设置（但随每次调用而变化），最后6个字节始终为0.
我不确定发生了什么事;鉴于我在32位运行这个Excel =指针将是4个字节长，它几乎看起来有点像只发送一些变量的地址。
当我尝试调用此函数传递数据的显式地址（注释掉的SendWithPtr（）调用）时，会出现同样的问题，因此这也无济于事。
有谁知道那里发生了什么？我是否需要以任何方式调用send（）函数？！
由于
VBA代码：
Option Explicit
' Constants ----------------------------------------------------------
Const INVALID_SOCKET = -1
Const WSADESCRIPTION_LEN = 256
Const SOCKET_ERROR = -1
' Typ definitions ----------------------------------------------------
Private Type WSADATA
wVersion As Integer
wHighVersion As Integer
szDescription(0 To WSADESCRIPTION_LEN) As Byte
szSystemStatus(0 To WSADESCRIPTION_LEN) As Byte
iMaxSockets As Integer
iMaxUdpDg As Integer
lpVendorInfo As Long
End Type
Private Type ADDRINFO
ai_flags As Long
ai_family As Long
ai_socktype As Long
ai_protocol As Long
ai_addrlen As Long
ai_canonName As LongPtr 'strptr
ai_addr As LongPtr 'p sockaddr
ai_next As LongPtr 'p addrinfo
End Type
' Enums ---------------------------------------------------------------
Enum AF
AF_UNSPEC = 0
AF_INET = 2
AF_IPX = 6
AF_APPLETALK = 16
AF_NETBIOS = 17
AF_INET6 = 23
AF_IRDA = 26
AF_BTH = 32
End Enum
Enum sock_type
SOCK_STREAM = 1
SOCK_DGRAM = 2
SOCK_RAW = 3
SOCK_RDM = 4
SOCK_SEQPACKET = 5
End Enum
' External functions --------------------------------------------------
Public Declare Function WSAStartup Lib "ws2_32.dll" (ByVal wVersionRequested As Integer, ByRef data As WSADATA) As Long
Public Declare Function connect Lib "ws2_32.dll" (ByVal socket As Long, ByVal SOCKADDR As Long, ByVal namelen As Long) As Long
Public Declare Sub WSACleanup Lib "ws2_32.dll" ()
Private Declare PtrSafe Function GetAddrInfo Lib "ws2_32.dll" Alias "getaddrinfo" (ByVal NodeName As String, ByVal ServName As String, ByVal lpHints As LongPtr, lpResult As LongPtr) As Long
Public Declare Function ws_socket Lib "ws2_32.dll" Alias "socket" (ByVal AF As Long, ByVal stype As Long, ByVal Protocol As Long) As Long
Public Declare Function closesocket Lib "ws2_32.dll" (ByVal socket As Long) As Long
Private Declare PtrSafe Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal length As Long)
Public Declare Function Send Lib "ws2_32.dll" Alias "send" (ByVal s As Long, ByRef buf() As Byte, ByVal buflen As Long, ByVal flags As Long) As Long
Public Declare Function SendWithPtr Lib "ws2_32.dll" Alias "send" (ByVal s As Long, ByVal bufPtr As Long, ByVal buflen As Long, ByVal flags As Long) As Long
Private Declare PtrSafe Function WSAGetLastError Lib "ws2_32.dll" () As Long
Private Declare Function VarPtrArray Lib "VBE7" Alias "VarPtr" (var() As Any) As Long
Sub TestWinsock()
Dim m_wsaData As WSADATA
Dim m_RetVal As Integer
Dim m_Hints As ADDRINFO
Dim m_ConnSocket As Long: m_ConnSocket = INVALID_SOCKET
Dim Server As String
Dim port As String
Dim pAddrInfo As LongPtr
Dim RetVal As Long
Dim lastError As Long
RetVal = WSAStartup(MAKEWORD(2, 2), m_wsaData)
If (RetVal <> 0) Then
LogError "WSAStartup failed with error " & RetVal, WSAGetLastError()
Call WSACleanup
Exit Sub
End If
m_Hints.ai_family = AF.AF_UNSPEC
m_Hints.ai_socktype = sock_type.SOCK_STREAM
Server = "localhost"
port = "5001"
RetVal = GetAddrInfo(Server, port, VarPtr(m_Hints), pAddrInfo)
If (RetVal <> 0) Then
LogError "Cannot resolve address " & Server & " and port " & port & ", error " & RetVal, WSAGetLastError()
Call WSACleanup
Exit Sub
End If
m_Hints.ai_next = pAddrInfo
Dim connected As Boolean: connected = False
Do While m_Hints.ai_next > 0
CopyMemory m_Hints, ByVal m_Hints.ai_next, LenB(m_Hints)
m_ConnSocket = ws_socket(m_Hints.ai_family, m_Hints.ai_socktype, m_Hints.ai_protocol)
If (m_ConnSocket = INVALID_SOCKET) Then
LogError "Error opening socket, error " & RetVal
Else
Dim connectionResult As Long
connectionResult = connect(m_ConnSocket, m_Hints.ai_addr, m_Hints.ai_addrlen)
If connectionResult <> SOCKET_ERROR Then
connected = True
Exit Do
End If
LogError "connect() to socket failed"
closesocket (m_ConnSocket)
End If
Loop
If Not connected Then
LogError "Fatal error: unable to connect to the server", WSAGetLastError()
Call WSACleanup
Exit Sub
End If
Dim SendBuf() As Byte
SendBuf = StrConv("Message #1", vbFromUnicode)
Dim buflen As Integer
buflen = UBound(SendBuf) - LBound(SendBuf) + 1
' !!!!!!!!!!!
' !! Send() does not seem to send the right bytes !!
' !!!!!!!!!!!
RetVal = Send(m_ConnSocket, SendBuf, buflen, 0)
' The following does not work either:
' RetVal = SendWithPtr(m_ConnSocket, VarPtrArray(SendBuf), buflen, 0)
If RetVal = SOCKET_ERROR Then
LogError "send() failed", WSAGetLastError()
Call WSACleanup
Exit Sub
Else
Debug.Print "sent " & RetVal & " bytes"
End If
RetVal = closesocket(m_ConnSocket)
If RetVal <> 0 Then
LogError "closesocket() failed", WSAGetLastError()
Call WSACleanup
Else
Debug.Print "closed socket"
End If
End Sub
Public Function MAKEWORD(Lo As Byte, Hi As Byte) As Integer
MAKEWORD = Lo + Hi * 256& Or 32768 * (Hi > 127)
End Function
Private Sub LogError(msg As String, Optional ErrorCode As Long = -1)
If ErrorCode > -1 Then
msg = msg & " (error code " & ErrorCode & ")"
End If
Debug.Print msg
End Sub
服务器代码，仅供参考：
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
namespace Server
{
class Program
{
static void Main(string[] args)
{
var address = Dns.GetHostEntry("localhost").AddressList[0];
var addressBytes = address.GetAddressBytes();
var port = 5001;
var ipEndpoint = new IPEndPoint(address, port);
var listener = new TcpListener(ipEndpoint);
listener.Start();
bool done = false;
TcpClient tcpClient = null;
try
{
while (!done)
{
Thread.Sleep(10);
Console.WriteLine("Waiting for broadcast");
tcpClient = listener.AcceptTcpClient();
byte[] bytes = new byte[10];
NetworkStream stream = tcpClient.GetStream();
var bytesRead = stream.Read(bytes, 0, bytes.Length);
// when called via the VBA sample, "bytes" will contain odd values.
// when called through Microsoft's C++ sample, everything works fine
}
}
finally {
tcpClient?.Close();
}
}
}
}
答案 0 :(得分：1)
你需要传递数组中数据的地址 - 即第一个元素的地址（因为变量本身的地址是封闭的SAFEARRAY的地址）
将send参数更改为ByRef buf As Any
传递第一个数组元素的地址：
RetVal = Send(m_ConnSocket, SendBuf(0), buflen, 0)
答案 1 :(得分：0)
Dim arrBuffers(1 To MAX_BUFFER_LENGTH) As Byte
Dim lngBytesReceived As Long
Dim strTempBuffer As String
lngBytesReceived = recv(s1, arrBuffers(1), MAX_BUFFER_LENGTH, 0&)
If lngBytesReceived > 0 Then
'
' If we have received some data, convert it to the Unicode
' string that is suitable for the Visual Basic String data type
'
strTempBuffer = StrConv(arrBuffers, vbUnicode)
'
' Remove unused bytes
'
strBuffer = Left$(strTempBuffer, lngBytesReceived)
答案 2 :(得分：0)
Const MAX_BUFFER_LENGTH As Long = 8192
Dim arrBuffers(1 To MAX_BUFFER_LENGTH) As Byte
Dim lngBytesReceived As Long
Dim strTempBuffer As String
lngBytesReceived = recv(s1, arrBuffers(1), MAX_BUFFER_LENGTH, 0&)
strTempBuffer = StrConv(arrBuffers, vbUnicode)
strBuffer = Left$(strTempBuffer, lngBytesReceived)