Question

我正在实现一个简单的多线程FTP客户端服务器，我面临一个对我来说很奇怪的问题（因为我不是C ++和线程的主人）。

我写的代码正常工作，直到我#include <thread>。

一旦我包含线程类，程序就会在listen上失败并给出10022错误。（我还没有完成与线程相关的任何事情，只能导入）。

以下是代码。该方法从main（）。

调用

#include <winsock2.h>
#include <ws2tcpip.h>
#include <process.h>
#include <winsock.h>
#include <iostream>
#include <windows.h>
#include <fstream>
#include <string>
#include <stdio.h>
#include <time.h>
#include <thread>

using namespace std;

void initializeSockets()
    {
    try{
        logEvents("SERVER", "Initializing the server");
        WSADATA wsadata;
        if (WSAStartup(0x0202,&wsadata)!=0){
            cout<<"Error in starting WSAStartup()\n";
            logEvents("SERVER", "Error in starting WSAStartup()");
        }else{

            logEvents("SERVER", "WSAStartup was suuccessful");
        }

        gethostname(localhost,20);
        cout<<"hostname: "<<localhost<< endl;
        if((hp=gethostbyname(localhost)) == NULL) {
            cout << "gethostbyname() cannot get local host info?"
                << WSAGetLastError() << endl;
            logEvents("SERVER", "Cannot get local host info. Exiting....");
            exit(1);
        }

        //Create the server socket
        if((serverSocket = socket(AF_INET,SOCK_STREAM,0))==INVALID_SOCKET) 
            throw "can't initialize socket";

        //Fill-in Server Port and Address info.
        serverSocketAddr.sin_family = AF_INET;
        serverSocketAddr.sin_port = htons(port);
        serverSocketAddr.sin_addr.s_addr = htonl(INADDR_ANY);

        //Bind the server port
        if (bind(serverSocket,(LPSOCKADDR)&serverSocketAddr,sizeof(serverSocketAddr)) == SOCKET_ERROR)
            throw "can't bind the socket";
        cout << "Bind was successful" << endl;
        logEvents("SERVER", "Socket bound successfully.");

        if(listen(serverSocket,10) == SOCKET_ERROR)
            throw "couldn't set up listen on socket";
        else 
            cout << "Listen was successful" << endl;
        logEvents("SERVER", "Socket now listening...");
        //Connection request accepted.
        acceptUserConnections();
    }

    catch(char* desc)
    { 
        cerr<<str<<WSAGetLastError()<<endl;
        logEvents("SERVER", desc);
    }

    logEvents("SERVER", "Closing client socket...");
    closesocket(clientSocket);
    logEvents("SERVER", "Closed. \n Closing server socket...");
    closesocket(serverSocket);
    logEvents("SERVER", "Closed. Performing cleanup...");

    WSACleanup();

}

int main(void){

    initializeSockets();
    return 0;
}

我已阅读帖子Winsock Error 10022 on Listen，但我不认为这可以解决我的问题。

Answer 1

错误10022是WSAEINVAL。 listen()的{{3}}明确指出：

WSAEINVAL
套接字尚未绑定绑定。

添加#include <thread>后代码停止工作的原因是因为您对bind()的调用被更改为不再调用WinSock的documentation函数，而是调用STL的using namespace std 3}}功能。您的using namespace std声明掩盖了该问题（这是using namespace std如此错误练习的众多原因之一 - 教会自己停止使用它！）。

所以你需要：

摆脱bind()。
使用全局命名空间限定if (::bind(...) == SOCKET_ERROR)，因此它调用WinSock的函数：
```
{{1}}
```

包含线程时监听时WINSOCK错误10022

1 个答案: