服务器套接字只能连接几次（Winsock C+；+；） 我试图在C++中编写一个服务器Winsock，以允许从PHP客户端代码连接。PHP将从服务器请求数据，接收数据，然后关闭连接。但是，经过2-3次连接后，当PHP再次请求时，它挂起在socket_read（），页面继续加载，并且服务器没有收到FD_ACCEPT事件。是否因为等待时间的关系，连接尚未关闭？任何关于代码改进的建议都很好 SOCKET s; SOCKADDR_IN from; int fromLen = sizeof(from); int port = 1111; int listenOnPort(int portNo) { WSAData w; int error = WSAStartup(0x0202, &w); // fill in wsa info if(error) { printError(5); return 0; } if(w.wVersion != 0x0202) { printError(6); WSACleanup(); return 0; } SOCKADDR_IN addr; SOCKET client; addr.sin_family = AF_INET; addr.sin_port = htons(portNo); addr.sin_addr.s_addr = htonl(INADDR_ANY); s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if(s == INVALID_SOCKET) { printError(7); return 0; } BOOL bOptVal = TRUE; int bOptLen = sizeof (BOOL); if(setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&bOptVal, bOptLen) == SOCKET_ERROR) { printError(12); return 0; } if(bind(s, (LPSOCKADDR)&addr, sizeof(addr)) == SOCKET_ERROR) { printError(8); return 0; } if( listen(s, 1) == SOCKET_ERROR ) //start listening { printError(13); return 0; } //WSAAsyncSelect(s, hwnd, 1045, FD_READ | FD_CONNECT | FD_CLOSE | FD_ACCEPT); cout << "Ready to accept connection, listening on port " << portNo << endl; CreateThread(0,0, &listenForEvents, NULL, 0, 0); //listenForEvents(); return 1; //ok } DWORD WINAPI listenForEvents(void* lp) { HANDLE sockEv=CreateEvent(NULL,TRUE,FALSE,NULL); if(WSAEventSelect(s,sockEv,FD_ACCEPT|FD_CONNECT| FD_READ | FD_CLOSE )==SOCKET_ERROR) printError(9); for(;;) { if(WSAWaitForMultipleEvents(1,&sockEv,FALSE,INFINITE,FALSE)!=WSA_WAIT_EVENT_0) printError(10); WSANETWORKEVENTS wsaEvents={0}; if(WSAEnumNetworkEvents(s,sockEv,&wsaEvents)==SOCKET_ERROR) printError(11); if((wsaEvents.lNetworkEvents & FD_ACCEPT)==FD_ACCEPT) { SOCKET tempSock = accept(s, (struct sockaddr*) &from, &fromLen); s = tempSock; //switch our old socket to the new one char acceptAddr[100]; char* msg = "Connnection from [%s] accepted."; //sprintf(acceptAddr, msg, inet_ntoa(from.sin_addr) ); sprintf_s(acceptAddr, strlen(msg) + 100, msg, inet_ntoa(from.sin_addr)); cout << acceptAddr << endl; hasClient = true; } else if((wsaEvents.lNetworkEvents & FD_READ) == FD_READ){ char buffer[1000]; memset(buffer, 0, sizeof(buffer)); recv(s, buffer, sizeof(buffer)-1, 0); receiveAction(string(buffer)); //cout << buffer << endl; } else if((wsaEvents.lNetworkEvents & FD_CLOSE) == FD_CLOSE){ shutdown(s, SD_BOTH ); closesocket(s); cout << "socket closed" << endl; startServer(); // start server again return 0; } else if(wsaEvents.lNetworkEvents==0) { printError(14); cout << "lNetworkEvents==0" << endl; } } } void startServer(){ listenOnPort(port); }

最后，它成功了，我对winsock函数、流等还不是很了解。这是有效的。关键是让侦听器套接字保持活动状态，然后将客户机/接受的套接字存储在另一个位置

SOCKET sock[2];
SOCKADDR_IN from;
int fromLen = sizeof(from);
int port = 1111;
int listenOnPort(int portNo)
{
    WSAData w;

    int error = WSAStartup(0x0202, &w); // fill in wsa info

    if(error)
    {
        printError(5);
        return 0;
    }

    if(w.wVersion !=  0x0202)
    {
        printError(6);
        WSACleanup();
        return 0;
    }

    SOCKADDR_IN addr;
    SOCKET client;

    addr.sin_family = AF_INET;
    addr.sin_port = htons(portNo);
    addr.sin_addr.s_addr = htonl(INADDR_ANY);

    sock[0] = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    if(sock[0] == INVALID_SOCKET)
    {
        printError(7);
        return 0;
    }

    BOOL bOptVal = TRUE;
    int bOptLen = sizeof (BOOL);
    if(setsockopt(sock[0], SOL_SOCKET, SO_REUSEADDR, (char *)&bOptVal, bOptLen) == SOCKET_ERROR)
    {
        printError(12);
        return 0;
    }

    if(bind(sock[0], (LPSOCKADDR)&addr, sizeof(addr)) == SOCKET_ERROR)
    {
        printError(8);
        return 0;
    }

    if( listen(sock[0], 1) == SOCKET_ERROR ) //start listening
    {
        printError(13);
        return 0;
    }

    //WSAAsyncSelect(sock[0], hwnd, 1045, FD_READ | FD_CONNECT | FD_CLOSE | FD_ACCEPT);

    cout << "Ready to accept connection, listening on port " << portNo << endl;

    CreateThread(0,0, &listenForEvents, NULL, 0, 0);

    //listenForEvents();

    return 1; //ok
}


DWORD WINAPI listenForEvents(void* lp)
{
    HANDLE sockEv[2];
    sockEv[0]=CreateEvent(NULL,TRUE,FALSE,NULL);
    sockEv[1]=CreateEvent(NULL,TRUE,FALSE,NULL);
    if(WSAEventSelect(sock[0],sockEv[0],FD_ACCEPT|FD_CONNECT|FD_CLOSE )==SOCKET_ERROR) 
        printError(9);

    for(;;) {

        int index = WSAWaitForMultipleEvents(2,sockEv,FALSE,INFINITE,FALSE);
        //if(index != WSA_WAIT_EVENT_0)
        //  printError(10);

        index -= WSA_WAIT_EVENT_0;

      WSANETWORKEVENTS wsaEvents={0};
      if(WSAEnumNetworkEvents(sock[index],sockEv[index],&wsaEvents)==SOCKET_ERROR)
          printError(11);

      if((wsaEvents.lNetworkEvents & FD_ACCEPT)==FD_ACCEPT) {
            sock[index+1]= accept(sock[index], (struct  sockaddr*) &from, &fromLen);
            //s = clientSock; //switch our old socket to the new one

            if(WSAEventSelect(sock[index+1], sockEv[index+1], FD_READ|FD_CLOSE  ) == SOCKET_ERROR)
            {
                printError(15);
            }

            char acceptAddr[100];
            char* msg = "Connnection from [%s] accepted.";
            //sprintf(acceptAddr, msg, inet_ntoa(from.sin_addr) );
            sprintf_s(acceptAddr, strlen(msg) + 100, msg, inet_ntoa(from.sin_addr));

            cout << acceptAddr << endl;
            hasClient = true;
      }
      else if((wsaEvents.lNetworkEvents & FD_READ) == FD_READ){
          char buffer[1000];
          memset(buffer, 0, sizeof(buffer));
          recv(sock[index], buffer, sizeof(buffer)-1, 0);

          receiveAction(string(buffer));

      }
        else if((wsaEvents.lNetworkEvents & FD_CLOSE) == FD_CLOSE){
            shutdown(sock[index], SD_BOTH );
            closesocket(sock[index]);
            if(getDebug())
            {
                cout << "socket closed" << endl;
            }
            //startServer(); // start server again
            //return 0;
        }
      else if(wsaEvents.lNetworkEvents==0) {
          printError(14);
        cout << "lNetworkEvents==0" << endl;
      }
    }
}

插座插座[2]；
SOCKADDR_从中输入；
int-fromLen=sizeof（from）；
int端口=1111；
int-listenport（int-portNo）
{
WSAData w；
int error=WSAStartup（0x0202，&w）；//填写wsa信息
如果（错误）
{
打印错误（5）；
返回0；
}
如果（w.wVersion！=0x0202）
{
打印错误（6）；
WSACleanup（）；
返回0；
}
地址中的SOCKADDR_；
套接字客户端；
addr.sin_family=AF_INET；
地址sin_端口=htons（端口号）；
addr.sin_addr.s_addr=htonl（INADDR_ANY）；
sock[0]=套接字（自动网络、sock流、IPPROTO\u TCP）；
if（sock[0]==无效的\u套接字）
{
打印错误（7）；
返回0；
}
BOOL-bOptVal=TRUE；
int bOptLen=sizeof（布尔）；
if（setsockopt（sock[0]，SOL_SOCKET，SO_REUSEADDR，（char*）&bOptVal，bOptLen）=套接字错误）
{
打印错误（12）；
返回0；
}
if（bind（sock[0]，（LPSOCKADDR）&addr，sizeof（addr））==SOCKET\u错误）
{
打印错误（8）；
返回0；
}
if（listen（sock[0]，1）==SOCKET\u ERROR）//开始侦听
{
打印错误（13）；
返回0；
}
//WSAAsyncSelect（sock[0]，hwnd，1045，FD|u READ | FD|u CONNECT | FD|u CLOSE | FD|u ACCEPT）；
库特
SOCKET sock[2];
SOCKADDR_IN from;
int fromLen = sizeof(from);
int port = 1111;
int listenOnPort(int portNo)
{
    WSAData w;

    int error = WSAStartup(0x0202, &w); // fill in wsa info

    if(error)
    {
        printError(5);
        return 0;
    }

    if(w.wVersion !=  0x0202)
    {
        printError(6);
        WSACleanup();
        return 0;
    }

    SOCKADDR_IN addr;
    SOCKET client;

    addr.sin_family = AF_INET;
    addr.sin_port = htons(portNo);
    addr.sin_addr.s_addr = htonl(INADDR_ANY);

    sock[0] = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    if(sock[0] == INVALID_SOCKET)
    {
        printError(7);
        return 0;
    }

    BOOL bOptVal = TRUE;
    int bOptLen = sizeof (BOOL);
    if(setsockopt(sock[0], SOL_SOCKET, SO_REUSEADDR, (char *)&bOptVal, bOptLen) == SOCKET_ERROR)
    {
        printError(12);
        return 0;
    }

    if(bind(sock[0], (LPSOCKADDR)&addr, sizeof(addr)) == SOCKET_ERROR)
    {
        printError(8);
        return 0;
    }

    if( listen(sock[0], 1) == SOCKET_ERROR ) //start listening
    {
        printError(13);
        return 0;
    }

    //WSAAsyncSelect(sock[0], hwnd, 1045, FD_READ | FD_CONNECT | FD_CLOSE | FD_ACCEPT);

    cout << "Ready to accept connection, listening on port " << portNo << endl;

    CreateThread(0,0, &listenForEvents, NULL, 0, 0);

    //listenForEvents();

    return 1; //ok
}


DWORD WINAPI listenForEvents(void* lp)
{
    HANDLE sockEv[2];
    sockEv[0]=CreateEvent(NULL,TRUE,FALSE,NULL);
    sockEv[1]=CreateEvent(NULL,TRUE,FALSE,NULL);
    if(WSAEventSelect(sock[0],sockEv[0],FD_ACCEPT|FD_CONNECT|FD_CLOSE )==SOCKET_ERROR) 
        printError(9);

    for(;;) {

        int index = WSAWaitForMultipleEvents(2,sockEv,FALSE,INFINITE,FALSE);
        //if(index != WSA_WAIT_EVENT_0)
        //  printError(10);

        index -= WSA_WAIT_EVENT_0;

      WSANETWORKEVENTS wsaEvents={0};
      if(WSAEnumNetworkEvents(sock[index],sockEv[index],&wsaEvents)==SOCKET_ERROR)
          printError(11);

      if((wsaEvents.lNetworkEvents & FD_ACCEPT)==FD_ACCEPT) {
            sock[index+1]= accept(sock[index], (struct  sockaddr*) &from, &fromLen);
            //s = clientSock; //switch our old socket to the new one

            if(WSAEventSelect(sock[index+1], sockEv[index+1], FD_READ|FD_CLOSE  ) == SOCKET_ERROR)
            {
                printError(15);
            }

            char acceptAddr[100];
            char* msg = "Connnection from [%s] accepted.";
            //sprintf(acceptAddr, msg, inet_ntoa(from.sin_addr) );
            sprintf_s(acceptAddr, strlen(msg) + 100, msg, inet_ntoa(from.sin_addr));

            cout << acceptAddr << endl;
            hasClient = true;
      }
      else if((wsaEvents.lNetworkEvents & FD_READ) == FD_READ){
          char buffer[1000];
          memset(buffer, 0, sizeof(buffer));
          recv(sock[index], buffer, sizeof(buffer)-1, 0);

          receiveAction(string(buffer));

      }
        else if((wsaEvents.lNetworkEvents & FD_CLOSE) == FD_CLOSE){
            shutdown(sock[index], SD_BOTH );
            closesocket(sock[index]);
            if(getDebug())
            {
                cout << "socket closed" << endl;
            }
            //startServer(); // start server again
            //return 0;
        }
      else if(wsaEvents.lNetworkEvents==0) {
          printError(14);
        cout << "lNetworkEvents==0" << endl;
      }
    }
}