我正在尝试在VBA中使用WinSock2从本地TCP流发送（以后再接收）数据。
目前，我主要尝试从此处复制客户端样本，https://msdn.microsoft.com/en-us/library/windows/desktop/ms738630(v=vs.85).aspx
我的代码“几乎”有效；我可以创建一个套接字并建立与服务器的连接。不过，发送数据（例如调用ws2_32.dll的send（）函数）很奇怪。
在下面的示例中，服务器确实会收到长度为10的字节数组，但是其内容是奇数。设置数组的前4个字节（但随每次调用而变化），后6个字节始终为0。
我不太确定发生了什么；给定我在32位Excel中运行的结果，即指针的长度为4个字节，这似乎有点像仅发送某些变量的地址。
[当我尝试调用此函数以传递数据的显式地址（已注释掉的SendWithPtr（）调用时，发生相同的问题，因此也无济于事。
有人知道那里发生了什么吗？我是否需要以任何方式调用send（）函数？！
谢谢
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();
}
}
}
}
我正在尝试在VBA中使用WinSock2从本地TCP流发送（以后再接收）数据。目前，我主要是尝试从此处复制客户端示例，https：//msdn.microsoft ....
您需要在数组内传递数据的地址-即第一个元素的地址（因为变量本身的地址是包含SAFEARRAY的地址）
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$(strTempBuffer, lngBytesReceived)
Dim arrBuffers(1 To MAX_BUFFER_LENGTH) As Byte
Dim lngBytesReceived As Long
Dim strTempBuffer As String
lngBytesReceived = recv(s1, arrBuffers(1), MAX_BUFFER_LENGTH, 0&)
If lngBytesReceived > 0 Then
'
' If we have received some data, convert it to the Unicode
' string that is suitable for the Visual Basic String data type
'
strTempBuffer = StrConv(arrBuffers, vbUnicode)
'
' Remove unused bytes
'
strBuffer = Left$(strTempBuffer, lngBytesReceived)