Question

我正在开发Windows窗体应用程序中的套接字编程（UDP套接字）。我按下了按钮点击socket（）然后我想在其他按钮上发送一些字节click.Sendto（）在我点击所需的按钮时返回0但是在另一端没有收到数据但是当我从一个调用sendto（）时它在同一个应用程序中运行正常。

下面是调用socket（）的函数：

int socket_create(String^* error,SOCKET *sock_fd,int port_number)
{
    sockaddr_in my_addr;
    *sock_fd = INVALID_SOCKET;

    // Create a SOCKET for the server to listen for client connections
    *sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
    if (*sock_fd == INVALID_SOCKET)
    {
        this->richTextBox1->AppendText("Error at socket():"+     WSAGetLastError() + "\n");
        return -1;
    }
    else 
        this->richTextBox1->AppendText("Socket succesfully opened on port number: " + port_number + "\n");
    // The sockaddr_in structure specifies the address family,
    // IP address, and port for the socket that is being bound.
    my_addr.sin_family = AF_INET;
    my_addr.sin_addr.s_addr = inet_addr("192.168.1.2");
    my_addr.sin_port = htons(port_number);

    if (bind(*sock_fd, (SOCKADDR *) & my_addr, sizeof (my_addr)) == SOCKET_ERROR)
    {
        this->richTextBox1->AppendText("bind failed:" + WSAGetLastError()+ "\n");
        //freeaddrinfo(result);
        closesocket(*sock_fd);
        return -1;
    }
    else
        this->richTextBox1->AppendText("Bind succesful on port number:" + port_number + "\n");
    return 0;
}

下面是按钮代码，它调用socket_create（）来打开socket：

private: System::Void Connect_btn_Click(System::Object^  sender, System::EventArgs^  e) 
{
    int status = 0;
    String^ error;
    status = socket_create(&error, &s_8888,8888);   
}

套接字描述符s_8888是全局定义的。

下面是调用sendto（）的按钮代码：

private: System::Void test_btn_Click(System::Object^  sender, System::EventArgs^  e) 
{
    sockaddr_in their_addr;
    their_addr.sin_family = AF_INET;
    their_addr.sin_addr.s_addr = inet_addr(ip_address);
    their_addr.sin_port = htons(8888);
    int length = sizeof (their_addr);
    i=sendto(s_8888 , buf , sizeof(buf), 0, (SOCKADDR *) &their_addr, length);
    if(i== SOCKET_ERROR)
    {
        MessageBox::Show("" + WSAGetLastError());
    }
    richTextBox1->AppendText("" + i + "\n");
}

我无法理解为什么它表现得那样以及如何解决它？

Sendto无法使用Windows窗体应用程序

0 个答案: