变量或字段 'nameOfVariable' 声明为 void 不知道为啥 :(

Posted 2023-02-22

【中文标题】变量或字段 \'nameOfVariable\' 声明为 void 不知道为啥 :(

【英文标题】：Variable or Field 'nameOfVariable' declared void no idea why :(变量或字段 'nameOfVariable' 声明为 void 不知道为什么 :(

【发布时间】：2011-02-05 04:02:52

【问题描述】：

我在各种网站上进行了谷歌搜索和搜索，但我无法弄清楚为什么我的某个功能会出现以下错误。

错误：变量或字段“ConnectClient”声明为无效

错误：未在此范围内声明“套接字”

这两个错误都是针对我的代码的第 38 行，即...

void ConnectClient(Socket _newConnection)

根据我从其他帖子中询问这个问题的理解，它通常归结为与头文件不一致（我没有用于这个小测试）或者他们在我没有的 void 函数中有一个返回类型没有。

注意：我已经删除了与部分游戏代码相关的额外代码，以及我正在测试的大量注释掉的代码。这个程序是对winsock使用的一个小测试

#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;

【问题讨论】：

类Socket（注意大写S和小写ocket）定义在哪里？

【参考方案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，而不是 Socket。

2) 您在上面的 cout 语句末尾缺少分号 (;)。

修复上面的两个错误，main() 中的相关编译器错误，您的代码至少可以编译。至于有没有用……

【讨论】：

FFFFFFFFFFFFUUUUUUUUUUUUUUUUUUUUUUUUU!!!!!!!!!当我犯这种错误时我讨厌它>_