c++ - 使用 WinSock2 开发，CreateThread() 函数出错

Question

我开始开发我的工具，它在 TCP 级别与 net 一起工作，但遇到了以下问题:

• 为Winsock的accept()函数创建线程

我用谷歌搜索并查找引用资料，到处都有关于创建新线程的信息:

• 它的前缀必须是 DWORD WINAPI (unsigned long __stdcall)
• 它必须接受 LPVOID 参数

并且此类函数将用作 CreateThread() 函数中的第三个参数作为 LPTHREAD_START_ROUTINE 结构。

但是编译后出现下一个错误:

(131):错误 C2664:“CreateThread”:无法将参数 3 从“DWORD (__stdcall Net::*)(LPVOID)”转换为“LPTHREAD_START_ROUTINE”

这是我的代码:

#include <iostream>
#include <Windows.h>

#pragma comment(lib, "Ws2_32.lib")

typedef struct Header
{
friend struct Net;

private:
    WORD wsa_version;
    WSAData wsa_data;

    SOCKET sock;
    SOCKADDR_IN service;

    char *ip;
    unsigned short port;

public:
    Header(void)
    {
        wsa_version = 0x202;

        ip = "0x7f.0.0.1";
        port = 0x51;

        service.sin_family = AF_INET;
        service.sin_addr.s_addr = inet_addr(ip);
        service.sin_port = htons(port);
    }

} Header;

typedef struct Net
{
private:
    int result;

    void WSAInit(WSAData *data, WORD *wsa_version)
    {
        result = WSAStartup(*wsa_version, &(*data));

        if(result != NO_ERROR)
        {
            std::cout << "WSAStartup() failed with the error: " << result << std::endl;
        }
        else
        {
            std::cout << (*data).szDescription << " " << (*data).szSystemStatus << std::endl;
        }
    }

    void SocketInit(SOCKET *my_socket)
    {
        (*my_socket) = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

        if((*my_socket) == INVALID_SOCKET)
        {
            std::cout << "Socket initialization failed with the error: " << WSAGetLastError() << std::endl;
            WSACleanup();
        }
        else
        {
            std::cout << "Socket initialization successful!" << std::endl;
        }
    }

    void SocketBind(SOCKET *my_socket, SOCKADDR_IN *service)
    {
        result = bind((*my_socket), (SOCKADDR*)&(*service), sizeof(*service));

        if(result == SOCKET_ERROR)
        {
            std::cout << "Socket binding failed with the error: " << WSAGetLastError() << std::endl;
            closesocket((*my_socket));
            WSACleanup();
        }
        else
        {
            std::cout << "Socket binding successful!" << std::endl;
        }

        result = listen(*my_socket, SOMAXCONN);

        if(result == SOCKET_ERROR)
        {
            std::cout << "Socket listening failed with the error: " << WSAGetLastError() << std::endl;
        }
        else
        {
            std::cout << "Listening to the socket..." << std::endl;
        }
    }

    void SocketAccept(SOCKET *my_socket)
    {
        SOCKET sock_accept = accept((*my_socket), 0, 0);

        if(sock_accept == INVALID_SOCKET)
        {
            std::cout << "Accept failed with the error: " << WSAGetLastError() << std::endl;
            closesocket(*my_socket);
            WSACleanup();
        }
        else
        {
            std::cout << "Client socket connected!" << std::endl;
        }

        char data[0x400];
        result = recv(sock_accept, data, sizeof(data), 0);
    }

    DWORD WINAPI Threading(LPVOID lpParam)
    {
        SOCKET *my_socket = (SOCKET*)lpParam;
        SocketAccept(my_socket);
    }

public:
    Net(void)
    {
        Header *obj_h = new Header();

        WSAInit(&obj_h->wsa_data, &obj_h->wsa_version);

        SocketInit(&obj_h->sock);
        SocketBind(&obj_h->sock, &obj_h->service);

        HANDLE thrd = CreateThread(NULL, 0, &Net::Threading, &obj_h->sock, 0, NULL);

        delete &obj_h;
    }
} Net;

int main(void)
{
    Net *obj_net = new Net();

    delete &obj_net;

    return 0;
}

Answer 1

你不能使用 C++ 非静态成员函数。

使用静态的