c++ - TCP 温索克 : accept multiple connections/clients

Question

我试图增加客户数量，并将其发送给每个客户。 但它仅适用于一个客户端，在一个客户端连接到服务器后，服务器对传入连接毫无用处。

while(true)
{
    if(Sub = accept(Socket, (sockaddr*)&IncomingAddress, &AddressLen))
    {
        for(int i = 0; i < MaxUsers; i++)
        {
            if(!ClientAddress[i].sin_family)
            {
                ClientAddress[i] = IncomingAddress;
                char Version[128], Dir[256], Path[256], URL[128], Message[256];
                GetCurrentDirectory(256, Dir);
                sprintf(Path, "%s\\Version.ini", Dir);
                GetPrivateProfileString("Default", "Version", "1.0.0.0", Version, 128, Path);
                GetPrivateProfileString("Default", "URL", "", URL, 128, Path);
                GetPrivateProfileString("Default", "Message", "", Message, 256, Path);
                send(Sub, Version, 128, 0);
                send(Sub, Message, 256, 0);
                break;
            }
        }
        continue;

    }
}

Answer 1

当然不能接受新客户端，因为服务器处理刚刚接受的客户端，即服务器正忙。

解决方案很简单:为每个接受的客户端创建一个新线程并在那里处理客户端 session 。只需使用 _beginthreadex() ( #include <process.h> ):

unsigned __stdcall ClientSession(void *data)
{
    SOCKET client_socket = (SOCKET)data;
    // Process the client.
}

int _tmain(int argc, _TCHAR* argv[])
{
    ...

    SOCKET client_socket;
    while ((client_socket = accept(server_socket, NULL, NULL))) {
        // Create a new thread for the accepted client (also pass the accepted client socket).
        unsigned threadID;
        HANDLE hThread = (HANDLE)_beginthreadex(NULL, 0, &ClientSession, (void*)client_socket, 0, &threadID);
    }
}

顺便说一下，send()/recv()函数不保证所有数据将在一次调用中发送/接收。有关这些函数的返回值，请参阅文档。