Question

我想在我的Android智能手机和Win10计算机之间启动TCP连接。我有一个正在运行的C ++服务器，可以很容易地与其他C ++客户端连接。 Xamarin上的C＃客户端抛出以下异常：

{System.Net.Sockets.SocketException（0x80004005）：在以下位置拒绝连接
  System.Net.Sockets.Socket.Connect（System.Net.EndPoint remoteEP）[0x000b6]，位于：0处，
  AndroidSocketClient.MainActivity.ConnectServer（System.Object发送者，System.EventArgs e）[0x00039]

C ++服务器

#include<io.h>
#include<stdio.h>
#include <string>
#include<winsock2.h>

#pragma comment(lib,"ws2_32.lib") //Winsock Library

int main(int argc, char* argv[])
{
    WSADATA wsa;
    SOCKET s, new_socket;
    struct sockaddr_in server, client;
    int c;

    printf("\nInitialising Winsock...");
    if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0)
    {
        printf("Failed. Error Code : %d", WSAGetLastError());
        return 1;
    }

    printf("Initialised.\n");

    //Create a socket
    if ((s = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
    {
        printf("Could not create socket : %d", WSAGetLastError());
    }

    printf("Socket created.\n");

    //Prepare the sockaddr_in structure
    server.sin_family = AF_INET;
    server.sin_addr.s_addr = INADDR_ANY;
    server.sin_port = htons(27015);

    //Bind
    if (bind(s, (struct sockaddr*) & server, sizeof(server)) == SOCKET_ERROR)
    {
        printf("Bind failed with error code : %d", WSAGetLastError());
    }

    puts("Bind done");

    //Listen to incoming connections
    listen(s, 3);

    //Accept and incoming connection
    puts("Waiting for incoming connections...");

    c = sizeof(struct sockaddr_in);
    new_socket = accept(s, (struct sockaddr*) & client, &c);
    if (new_socket == INVALID_SOCKET)
    {
        printf("accept failed with error code : %d", WSAGetLastError());
    }

    puts("Connection accepted");

    //Reply to client
    const char* message = "Hello Client , I have received your connection. But I have to go now, bye\n";
    send(new_socket, message, strlen(message), 0);

    getchar();

    closesocket(s);
    WSACleanup();

    return 0;
}

C＃-客户端

public void ConnectServer(object sender, System.EventArgs e)
{
    byte[] data = new byte[10];

    IPHostEntry iphostInfo = Dns.GetHostEntry(Dns.GetHostName());
    IPAddress ipAdress = iphostInfo.AddressList[0];
    IPEndPoint ipEndpoint = new IPEndPoint(ipAdress, 27015);

    Socket client = new Socket(ipAdress.AddressFamily, SocketType.Stream, ProtocolType.Tcp);

    try
    {
        client.Connect(ipEndpoint);
        Console.WriteLine("Socket created to {0}", client.RemoteEndPoint.ToString());

        while (true)
        {
            string message = "Test";
            byte[] sendmsg = Encoding.ASCII.GetBytes(message);
            int n = client.Send(sendmsg);
        }
    }
    catch (Exception ex)
    {
        Toast.MakeText(this, ex.ToString(), ToastLength.Short).Show();
    }

    Console.WriteLine("Transmission end.");
}

经过测试的解决方案：

我已经尝试关闭防火墙并允许Internet连接。

uses-permission android:name="android.permission.INTERNET"

将C＃-Client连接到C ++ Server时出现System.Net.Sockets.SocketException（0x80004005）

0 个答案: