[英]C++ - Windows - recvfrom() failing with “No such file or directory” on simple server
Here is the code of the very simple server I'm trying to make: 这是我要制作的非常简单的服务器的代码:
Network.h: Network.h:
#include <WinSock2.h>
#include <WS2tcpip.h>
#include <system_error>
#include <string>
#include <iostream>
#pragma once
class WSASession
{
public:
WSASession()
{
int ret = WSAStartup(MAKEWORD(2, 2), &data);
if (ret != 0)
throw std::system_error(WSAGetLastError(), std::system_category(), "WSAStartup Failed");
}
~WSASession()
{
WSACleanup();
}
private:
WSAData data;
};
class UDPSocket
{
public:
UDPSocket()
{
sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (sock == INVALID_SOCKET)
throw std::system_error(WSAGetLastError(), std::system_category(), "Error opening socket");
}
~UDPSocket()
{
closesocket(sock);
}
void SendTo(const std::string& address, unsigned short port, const char* buffer, int len, int flags = 0)
{
sockaddr_in add;
add.sin_family = AF_INET;
add.sin_addr.s_addr = inet_addr(address.c_str());
add.sin_port = htons(port);
int ret = sendto(sock, buffer, len, flags, reinterpret_cast<SOCKADDR *>(&add), sizeof(add));
if (ret < 0)
throw std::system_error(WSAGetLastError(), std::system_category(), "sendto failed");
}
void SendTo(sockaddr_in& address, const char* buffer, int len, int flags = 0)
{
int ret = sendto(sock, buffer, len, flags, reinterpret_cast<SOCKADDR *>(&address), sizeof(address));
if (ret < 0)
throw std::system_error(WSAGetLastError(), std::system_category(), "sendto failed");
}
sockaddr_in RecvFrom(char* buffer, int len, int flags = 0)
{
sockaddr_in from;
int size = sizeof(from);
int ret = recvfrom(sock, buffer, len, flags, reinterpret_cast<SOCKADDR *>(&from), &size);
if (ret < 0)
throw std::system_error(WSAGetLastError(), std::system_category(), "recvfrom failed");
// make the buffer zero terminated
buffer[ret] = 0;
return from;
}
void Bind(unsigned short port)
{
sockaddr_in add;
add.sin_family = AF_INET;
add.sin_addr.s_addr = htonl(INADDR_ANY);
add.sin_port = htons(port);
int ret = bind(sock, reinterpret_cast<SOCKADDR *>(&add), sizeof(add));
if (ret < 0)
throw std::system_error(WSAGetLastError(), std::system_category(), "Bind failed");
}
private:
SOCKET sock;
};
Listener server: 侦听器服务器:
try
{
WSASession Session;
UDPSocket Socket;
char buffer[512];
Socket.Bind(22);
while (1)
{
sockaddr_in add = Socket.RecvFrom(buffer, sizeof(buffer));
std::string srecv(buffer);
}
}
catch (std::system_error& e)
{
std::cout << e.what();
}
All is perfect until it accepts a connection from a client. 在接受来自客户端的连接之前,一切都是完美的。 The recvfrom function fails with error "No such file or directory" recvfrom函数失败,错误为“无此文件或目录”
Does anyone see the problem? 有人看到这个问题吗? I know the port isn't problematic because I was listening on the same port from a .net application which works perfectly. 我知道端口没有问题,因为我正在从.net应用程序监听同一端口,该端口运行良好。
You have: 你有:
const std::string& address, unsigned short port, const char* buffer, int len, int flags = 0)
and 和
int ret = sendto(sock, buffer, len, flags, reinterpret_cast<SOCKADDR *>(&add)
The cast is invalid. 强制转换无效。 A std::string
isn't a SOCKADDR
. std::string
不是SOCKADDR
。 You have to convert, probably by calling getaddrinfo()
. 您必须通过调用getaddrinfo()
进行转换 。
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