C++ WSARecvFrom目标ip地址

我使用WSARecvFrom函数。看起来是这样的：

addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = htons(listen_port);

bind(s, reinterpret_cast<PSOCKADDR>(&addr), sizeof(addr));

...

WSARecvFrom(s, ..., reinterpret_cast<sockaddr *>(&event->address), &event->addressLength, ...);

初始化：

    if (dwMajorVersion >= 6)
    {
        if (pfWSARecvMsg == NULL)
        {
            // get WSARecvMsg pointer
            GUID WSARecvMsg_GUID = WSAID_WSARECVMSG;
            DWORD NumberOfBytes = 0;
            if (WSAIoctl(socket_, SIO_GET_EXTENSION_FUNCTION_POINTER,
                    &WSARecvMsg_GUID, sizeof(WSARecvMsg_GUID),
                    &pfWSARecvMsg, sizeof(pfWSARecvMsg),
                    &NumberOfBytes, NULL, NULL) == SOCKET_ERROR)
            {
                printf("Could not get WSARecvMsg. WSAGetLastError returned [%i]", WSAGetLastError());
                pfWSARecvMsg = NULL;
            }
        }

        if (pfWSASendMsg == NULL)
        {
            // get WSASendMsg pointer
            GUID WSASendMsg_GUID = WSAID_WSASENDMSG;
            DWORD NumberOfBytes = 0;
            if (WSAIoctl(socket_, SIO_GET_EXTENSION_FUNCTION_POINTER,
                    &WSASendMsg_GUID, sizeof(WSASendMsg_GUID),
                    &pfWSASendMsg, sizeof(pfWSASendMsg),
                    &NumberOfBytes, NULL, NULL) == SOCKET_ERROR)
            {
                printf("Could not get WSASendMsg. WSAGetLastError returned [%i]", WSAGetLastError());
                pfWSASendMsg = NULL;
            }
        }
    }

使用WSASendToEx的示例：

int result = WSASendToEx(event->socket_, &sendBufferDescriptor, 1, &dwSent, 0,
            reinterpret_cast<sockaddr *>(&event->address), event->addressLength, 
            from, event->controlBuffer, sizeof(event->controlBuffer), 
            &event->overlapped, NULL);

int result=WSASendToEx（事件->套接字和发送缓冲描述符，1，&dwSent，0，
重新解释\u cast（&event->address），event->addressLength，
from，event->controlBuffer，sizeof（event->controlBuffer），
&事件->重叠，空）；

WSARecvFromEx的用法示例：

int result = WSARecvFromEx(event->socket_, &recvBufferDescriptor, 1,
            &numberOfBytes, &recvFlags, 
        reinterpret_cast<sockaddr *>(&event->address), &event->addressLength, 
    event->controlBuffer, sizeof(event->controlBuffer),
    &event->overlapped, NULL);

int result=WSARecvFromEx（事件->socket\ux，&recvBufferDescriptor，1，
&numberOfBytes和recvFlags，
重新解释强制转换（&event->address），&event->addressLength，
事件->控制缓冲区，sizeof（事件->控制缓冲区），
&事件->重叠，空）；

当绑定到

INADDR\u ANY

时，无法从

WSARecvFrom（）

获取目标IP。如果您需要目标IP，则必须为要接收的每个本地IP创建并绑定一个单独的套接字，然后可以使用

getsockname（）

了解接收套接字绑定到哪个本地IP。

感谢您的回复，但我找到了解决方案：可以使用WSARECVMG函数获取目标IP（从Windows XP开始提供，但在XP上它给了我一个例外，在Win 7和Win Server 2008上工作正常）。

int result = WSARecvFromEx(event->socket_, &recvBufferDescriptor, 1,
            &numberOfBytes, &recvFlags, 
        reinterpret_cast<sockaddr *>(&event->address), &event->addressLength, 
    event->controlBuffer, sizeof(event->controlBuffer),
    &event->overlapped, NULL);