我正在编写两个应该相互连接的程序(客户端和服务器)。我终于解决了所有的个别错误,但是当我开始测试客户端程序时(在启动和服务器之后),连接函数停止了代码的进程。我用一些简单的文本输出对此进行了测试。
这是我的服务器代码(不是很重要)
#include "stdafx.h"
using namespace std;
int main()
{
WSAData WinSockData;
WORD DLLVERSION;
DLLVERSION = MAKEWORD(2, 1);
int wsa_success = WSAStartup(DLLVERSION, &WinSockData);
if (wsa_success != 0)
{
printf("Error %d while starting WSA\n", WSAGetLastError());
pause();
return 1;
}
SOCKET uc_socket;
uc_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (uc_socket == INVALID_SOCKET)
{
printf("Error %d while creating socket\n", WSAGetLastError());
pause();
return 1;
}
SOCKADDR_IN ADDRESS;
int AddressSize = sizeof(ADDRESS);
ADDRESS.sin_addr.s_addr = INADDR_ANY;
ADDRESS.sin_family = AF_INET;
ADDRESS.sin_port = htons(444);
int bind_success = bind(uc_socket, (SOCKADDR *)&ADDRESS, AddressSize);
if (bind_success != 0)
{
printf("Error %d while binding socket\n", WSAGetLastError());
pause();
return 1;
}
int listen_success = listen(uc_socket, 12);
if (listen_success != 0)
{
printf("Error %d while setting socket to listen\n", WSAGetLastError());
pause();
return 1;
}
SOCKET c_socket;
SOCKADDR_IN client_sock;
int client_sock_size = sizeof(client_sock);
printf("Socket created; Set to listen for incoming connections\n");
c_socket = accept(uc_socket, (SOCKADDR *)&client_sock, &client_sock_size);
if (c_socket == INVALID_SOCKET)
{
printf("Error %d while accepting connection request\n", WSAGetLastError());
pause();
return 1;
}
else
{
printf("Connection established!");
}
pause();
return 0;
}
还有我的客户端代码
#include "stdafx.h"
using namespace std;
int main()
{
int wsasuccessful = -1;
WSAData WinSockData;
WORD DLLVERSION;
DLLVERSION = MAKEWORD(2, 1);
wsasuccessful = WSAStartup(DLLVERSION, &WinSockData);
if (wsasuccessful != 0)
{
printf("Error %d in client while starting WSA\n", WSAGetLastError());
pause();
return 1;
}
SOCKET client_socket;
client_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (WSAGetLastError() != 0)
{
printf("Error %d in client while instantiating socket\n", WSAGetLastError());
pause();
return 1;
}
SOCKADDR_IN client_connection;
client_connection.sin_family = AF_INET;
client_connection.sin_port = htons(444);
client_connection.sin_addr.S_un.S_addr = INADDR_LOOPBACK;
int connection_success = -1;
printf("before connect()\n"); //for debugging
connection_success = connect(client_socket, (SOCKADDR *)&client_connection, sizeof(client_connection));
printf("after conenct()\n"); //for debugging
if (connection_success != 0)
{
printf("Error %d in client while instantiating socket\n", WSAGetLastError());
pause();
return 2;
}
printf("The client has found a server!");
printf("The last WSA error was: %d", WSAGetLastError());
pause();
return 0;
}
这两个程序都可以正常运行,但它们没有相互连接。我已将我的系统配置为允许监听和连接。
服务器输出是—— 已创建套接字;设置为监听传入连接
客户端输出是 - connect() 之前
我所看到的问题是客户端无法识别端口 444 上的监听套接字,并且会暂停程序直到可以建立连接。
我可以使用非阻塞套接字绕过它,但这并不能解决根本问题。
编辑:忘记包含我的 stdafx.h
#pragma once
#include "targetver.h"
#include <stdio.h>
#include <tchar.h>
#include <winsock2.h>
#include <Ws2tcpip.h>
#include <Inaddr.h>
#include <string.h>
#include <io.h>
#include <Windef.h>
#include <Ws2tcpip.h>
#include <WinNT.h>
#include <Windows.h>
#include <tchar.h>
void pause(void); //defined in stdafx.cpp
服务端和客户端都一样
编辑 2:在服务器代码的 accept() 函数中将 SOCKADDR 更改为 SOCKADDR_IN 后,最终收到 WSA 错误 10060。
问题仍然存在,但现在至少我知道这是连接失败,而不是代码。
最佳答案
connect 是一个阻塞操作(默认情况下)。它正在尝试连接并且不会返回,直到它工作或失败。听起来它会超时,可能是由于服务器计算机上的 Windows 防火墙阻止了端口。你等了多久?它是否曾经完成(失败)
关于c++ - connect() 函数停止程序,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35569146/