C ++客户端无法发送到服务器/ Winsock

时间:2013-10-16 13:33:10

标签: c++ client-server winsock2 winsockets

我正在开发一个高级客户端 - 服务器程序,我将一个游戏手柄的代码(已按下的按钮)发送到服务器。由于我发送了多个游戏手柄代码,在我的C ++代码的一个段落中,我必须重复客户端代码段。

我想在每次发送内容时调用一个函数。

客户端功能:

int client()
{
    // Initialize Winsock.
    WSADATA wsaData;
    int iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
    if (iResult != NO_ERROR) {
        MessageBox(NULL, TEXT("Winsock initialization, done unsuccessfully"), TEXT("Diploma   thesis"), MB_ICONERROR | MB_OK);
        return 1;
    }

    // Create a socket for connecting to server.
    SOCKET ConnectSocket;
    ConnectSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (ConnectSocket == INVALID_SOCKET) {
        MessageBox(NULL, TEXT("Socket creation for connecting to server, done    unsuccessfully"), TEXT("Diploma thesis"), MB_ICONERROR | MB_OK);
        WSACleanup();
        return 1;
    }

    // The sockaddr_in structure specifies the address family,
    // IP address, and port of the server to be connected to.
    sockaddr_in Service;
    memset(&Service, 0, sizeof(Service));
    Service.sin_family = AF_INET;
    Service.sin_addr.s_addr = inet_addr("127.0.0.1");
    Service.sin_port = htons(5004);

    // Connect to server.
    iResult = connect(ConnectSocket, (SOCKADDR *) &Service, sizeof (Service));
    if (iResult == SOCKET_ERROR) {
        iResult = closesocket(ConnectSocket);
        MessageBox(NULL, TEXT("Connection with server, done unsuccessfully"), TEXT("Diploma thesis"), MB_ICONERROR | MB_OK);
        WSACleanup();
        return 1;
    }

正如您所注意到的,客户端代码段不包含send函数。这是因为,正如我所说的,我并不总是发送相同的char变量。根据按下的按钮,有一个不同的字符要发送。例如:

代码段(发送Δ和O按钮):

client();
if (send(ConnectSocket, c_szText1, sizeof(c_szText1), 0) == SOCKET_ERROR)
    {MessageBox(NULL, TEXT("The message could not be sent"), TEXT("Diploma thesis"), MB_ICONERROR | MB_OK);}
}
client();
if (send(ConnectSocket, c_szText2, sizeof(c_szText2), 0) == SOCKET_ERROR)
    {MessageBox(NULL, TEXT("The message could not be sent"), TEXT("Diploma thesis"), MB_ICONERROR | MB_OK);}
    }

但是,发送功能因SOCKET_ERROR而失败。为什么会这样?任何帮助将不胜感激。

1 个答案:

答案 0 :(得分:0)

很难从您的代码中看出,但似乎int client()应该是您的服务器的某种连接启动功能,然后您拨打send,但您的SOCKET ConnectSocket;是本地到client() ...你还有套接字句柄的全局声明吗?也许您打算从ConnectSocket返回client()?此外,我强烈建议不要按每按一次按键。我建议使用单个持久连接,即连接一次,然后在必要时发送。