c++ - 变量或字段 'nameOfVariable' 声明无效不知道为什么 :(

Question

我在各种网站上进行了谷歌搜索，但我无法弄清楚为什么我的其中一个函数会出现以下错误。

错误:变量或字段“ConnectClient”声明无效

错误:“套接字”未在此范围内声明

这两个错误都是针对我的代码的第 38 行，也就是...

void ConnectClient(Socket _newConnection)

根据我从其他询问这个问题的帖子中了解到的，它通常归结为与头文件不一致(我没有将其用于这个小测试)或者它们在 void 函数中有一个我不知道的返回类型'有。

注意:我已经删除了与部分游戏代码相关的额外代码，以及我正在测试的一堆注释掉的代码。这个程序是winsock使用的小测试

#include <iostream>
#include <winsock2.h>

using namespace std;
const int serverPort = 31337;
const int serverMaxClients = 10;
SOCKET serverSocket;
SOCKET clientSocketArray[serverMaxClients];   //should this have a -1 on it?

bool clientSlotTaken[serverMaxClients];
sockaddr clientSocketAddresses[serverMaxClients];

int FindFreePlayerSpot()
{
    for (int slotIndex = 0; slotIndex < serverMaxClients; slotIndex++)
    {
        if (clientSlotTaken[slotIndex] == false)
        {
            return slotIndex;
        }
    }
    return -1;
}

void ConnectClient(Socket _newConnection)
{
    int slotIndex = FindFreePlayerSpot();
    if (slotIndex == -1)
    {
        closesocket(_newConnection);
        cout << "No player slots available, connection aborted"
    }
    else //Should have a connection
    {
        clientSocketArray[slotIndex] = _newConnection;
        if (clientSocketArray[slotIndex] == INVALID_SOCKET)
        {
            cout << "Client Connection Error - INVALID SOCKET " << WSAGetLastError();
        }
        else //Client should have connected
        {
            cout << "Client Connected on socket slot [" << slotIndex << "] from " << "\n";
            clientSlotTaken[slotIndex] = true;
        }
    }
}

void StartWinSock()
{
    WSADATA WsaDat;
    if(WSAStartup(MAKEWORD(2,2),&WsaDat)!=0)
    {
        std::cout<<"WSA Initialization failed!\r\n";
        WSACleanup();
        system("PAUSE");
    }

    serverSocket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
    if(serverSocket==INVALID_SOCKET)
    {
        std::cout<<"Server Socket creation failed.\r\n";
        WSACleanup();
        system("PAUSE");
    }

    SOCKADDR_IN serverInf;
    serverInf.sin_family=AF_INET;
    serverInf.sin_addr.s_addr=INADDR_ANY;
    serverInf.sin_port=htons(serverPort);

    if(bind(serverSocket,(SOCKADDR*)(&serverInf),sizeof(serverInf))==SOCKET_ERROR)
    {
        std::cout<<"Unable to bind socket!\r\n";
        WSACleanup();
        system("PAUSE");
    }

    if(listen(serverSocket,SOMAXCONN)==SOCKET_ERROR)
    {
        std::cout<<"Unable to Listen!\r\n";
        WSACleanup();
        system("PAUSE");
    }

    u_long iMode=1;
    ioctlsocket(serverSocket,FIONBIO,&iMode);
}


int main()
{
    playerShip = new PlayerShip;
    bool runningServer = true;

        cout << "Starting WinSock\n";
        StartWinSock();
        cout << "Running on port " << serverPort << "\n";


        while (true)
        {
            //Check for a connection
            Socket newConnection = accept(serverSocket,NULL,NULL);
            if (newConnection != SOCKET_ERROR)
            {
                cout << "Incomming connection attempt";
                ConnectClient(newConnection);
            }
            Sleep(1);
        }


    WSACleanup();
    return 0;
}

Answer 1

void ConnectClient(Socket _newConnection)
{
    int slotIndex = FindFreePlayerSpot();
    if (slotIndex == -1)
    {
        closesocket(_newConnection);
        cout << "No player slots available, connection aborted"
    }

这里有两个问题。

1)应该是SOCKET，不是Socket。

2) 上面的 cout 语句末尾缺少分号 (;)。

修复上面的这两个错误，main() 中的相关编译器错误和您的代码至少可以编译。至于能不能用……