80,488
社区成员
发帖
与我相关
我的任务
分享Windows的C++服务器和Android客户端用Socket通信，为什么会报IOException？
Android中的接收线程是这样的：
Windows上的服务器我用了一份开源的库，主程序是这样的：
其中SendLine函数是这么写的：
现在现象是：打开服务器后，运行客户端，客户端能够正确连接至服务器，但是服务器发给他“Hello”时，客户端接收不到，并报IOException。
这份代码之前我曾在多个地方用过，只不过当时的服务器不同，一个是用Java写的，一个是用Linux的C++写的……
想知道出错的可能原因？ 谢谢~~
class GetThread implements Runnable
{
@Override
public void run()
{
try
{
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
while(true)
{
String input = in.readLine();
if(input!=null)
{
Message msg = new Message();
msg.obj = input;
handler.sendMessage(msg);
}
}
}
catch (IOException e)
{
System.out.println("NetThreadIOException");
Message msg = new Message();
msg.obj = "net error";
handler.sendMessage(msg);
}Windows上的服务器我用了一份开源的库，主程序是这样的：
#include "Socket.h"
#include<iostream>
using namespace std;
const int PORT = 12121;
const int MAX_CONNECT = 100;
int main()
{
cout<<"Working..."<<endl;
SocketServer socket(PORT, MAX_CONNECT);
cout<<"Waiting for Client"<<endl;
socket.Accept();
socket.SendLine("Hello!");
cout<<"Hello!"<<endl;
system("pause");
return 0;
}其中SendLine函数是这么写的：
void Socket::SendLine(std::string s) {
s += '/n';
send(s_,s.c_str(),s.length(),0);
}现在现象是：打开服务器后，运行客户端，客户端能够正确连接至服务器，但是服务器发给他“Hello”时，客户端接收不到，并报IOException。
这份代码之前我曾在多个地方用过，只不过当时的服务器不同，一个是用Java写的，一个是用Linux的C++写的……
想知道出错的可能原因？ 谢谢~~
...全文
请发表友善的回复…
发表回复
qq_33455714 2015-12-21
- 打赏
- 举报
请问join()等待写在哪里 我也遇到了同样的问题
暗黑Zero 2015-03-04
- 打赏
- 举报
谢谢，检查了一下，确实是这个的问题，我现在用join()等待LoginThread结束以后再执行openGetThread就没问题了~
开发者_android 2015-03-04
- 打赏
- 举报
client_socket_manager.login()；这句开的线程在login，马上就执行下一句 client_socket_manager.openGetThread();
如果login的线程挂起或未login成功，那socket肯定是null，后面读信息，怎么读呢？
应该是确保login成功后，再oopenGetThread()。
暗黑Zero 2015-03-04
- 打赏
- 举报
我试着修改了一下，发现如果把接收线程写在主Activity里面，程序就是正常工作的，这说明服务器那边没有问题：
public class MainActivity extends Activity
{
EditText ip_box;
Button login_button;
TextView text;
Handler handler;
final int port = 12121;
ClientSocketManager client_socket_manager;
Socket socket;
String ip;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
handler = new Handler()
{
public void handleMessage(Message msg)
{
String words = (String)msg.obj;
if( words.equals("ok") == true )
{
Toast.makeText(MainActivity.this, "来自服务器的问候：登陆成功！！欢迎使用~",Toast.LENGTH_LONG).show();
finish();
}
else if(words.equals("did not login") )
{
Toast.makeText(MainActivity.this,"ip错了或者是主机没有开", Toast.LENGTH_SHORT).show();
}
else
{
text.setText((String)msg.obj);
}
}
};
class GetThread implements Runnable //接收线程
{
public void getMsg()
{
try
{
Scanner in = new Scanner(socket.getInputStream());
String gotmsg = in.nextLine();
Message msg = new Message();
msg.obj = gotmsg;
MainActivity.this.handler.sendMessage(msg);
} catch (UnknownHostException e)
{
Message msg = new Message();
msg.obj = "net error";
MainActivity.this.handler.sendMessage(msg);
} catch (IOException e)
{
Message msg = new Message();
msg.obj = "net error";
MainActivity.this.handler.sendMessage(msg);
}
}
@Override
public void run()
{
try
{
socket = new Socket();
socket.connect(new InetSocketAddress(ip, port) , 5000);
} catch (UnknownHostException e)
{
Message msg = new Message();
msg.obj = "did not login";
MainActivity.this.handler.sendMessage(msg);
} catch (IOException e) {
Message msg = new Message();
msg.obj = "did not login";
MainActivity.this.handler.sendMessage(msg);
}
if( socket != null)
getMsg();
else
{
Message msg = new Message();
msg.obj = "did not login";
MainActivity.this.handler.sendMessage(msg);
}
}
}
login_button.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View arg0)
{
// TODO Auto-generated method stub
ip = ip_box.getText().toString();
client_socket_manager = new ClientSocketManager(ip, port, handler);
boolean logged = client_socket_manager.login();
GetThread g = new GetThread();
new Thread(g).start();
}
});
}
}
public class ClientSocketManager //管理网络的类
{
String ip;
int port;
Socket socket;
Handler handler; //通过这个handler发消息
/**
* Thread to get message from server
* @author Zero
*
*/
class GetThread implements Runnable
{
@Override
public void run()
{
try
{
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
while(true)
{
String input = in.readLine();
if(input!=null)
{
Message msg = new Message();
msg.obj = input;
handler.sendMessage(msg);
}
}
}
catch (IOException e)
{
System.out.println("NetThreadIOException");
Message msg = new Message();
msg.obj = "net error";
handler.sendMessage(msg);
}
catch (NullPointerException e)
{
//System.out.println("NetThreadIOException");
Message msg = new Message();
msg.obj = "net error";
handler.sendMessage(msg);
}
}
}
/**
* Thread to login to server
* @author Zero
*
*/
class LoginThread implements Runnable
{
boolean ok;
@Override
public void run()
{
try
{
socket = new Socket();
socket.connect(new InetSocketAddress(ip, port) , 5000);
} catch (UnknownHostException e)
{
System.out.println("UnknownHostException");
Message msg = new Message();
msg.obj = "did not login";
handler.sendMessage(msg);
ok=false;
} catch (IOException e) {
System.out.println("IOException");
Message msg = new Message();
msg.obj = "did not login";
handler.sendMessage(msg);
ok=false;
}
}
}
public ClientSocketManager(){}
/**
* Create a new ClientSocketManager
* @param _ip
* @param _port
* @param _handler
*/
public ClientSocketManager(String _ip, int _port, Handler _handler)
{
ip = _ip;
port = _port;
handler = _handler;
}
public boolean login()
{
LoginThread login_thread = new LoginThread();
new Thread(login_thread).start();
return login_thread.ok;
}
public void openGetThread()
{
GetThread getThread = new GetThread();
new Thread(getThread).start();
}
}
login_button.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View arg0)
{
// TODO Auto-generated method stub
ip = ip_box.getText().toString();
client_socket_manager = new ClientSocketManager(ip, port, handler);
boolean logged = client_socket_manager.login();
//if(!logged)
// return;
client_socket_manager.openGetThread();
}
});
