Java Android客户端向C套接字服务器发送对象失败
我已经做了一个Android套接字程序作为客户端。一个c套接字服务器正在运行,它在套接字上执行recv。 read执行多次,即使我只发送一次有效负载结构 它发送以下数据:Java Android客户端向C套接字服务器发送对象失败,java,android,c,sockets,network-programming,Java,Android,C,Sockets,Network Programming,我已经做了一个Android套接字程序作为客户端。一个c套接字服务器正在运行,它在套接字上执行recv。 read执行多次,即使我只发送一次有效负载结构 它发送以下数据: import java.io.Externalizable; import java.io.ObjectInput; import java.io.ObjectOutput; public class DataToServer implements Externalizable { public int id;
import java.io.Externalizable;
import java.io.ObjectInput;
import java.io.ObjectOutput;
public class DataToServer implements Externalizable {
public int id;
public int cmd;
public byte active;
public byte level;
public byte group;
public DataToServer(int id, int cmd, byte active, byte level, byte group) {
super();
this.id = id;
this.cmd = cmd;
this.active = active;
this.level = level;
this.group = group;
}
public DataToServer() {
super();
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getCmd() {
return cmd;
}
public void setCmd(int cmd) {
this.cmd = cmd;
}
public byte getActive() {
return active;
}
public void setActive(byte active) {
this.active = active;
}
public byte getLevel() {
return level;
}
public void setLevel(byte level) {
this.level = level;
}
public byte getGroup() {
return group;
}
public void setGroup(byte group) {
this.group = group;
}
@Override
public void readExternal(ObjectInput input) throws IOException,
ClassNotFoundException {
this.id = input.readInt( );
this.cmd = input.readInt();
this.active = input.readByte();
this.level = input.readByte();
this.group = input.readByte();
}
@Override
public void writeExternal(ObjectOutput output) throws IOException {
output.writeInt(id);
output.writeInt(cmd);
output.writeByte(active);
output.writeByte(level);
output.writeByte(group);
}
}
接下来,我通过以下Android代码发送:
public class MainActivity extends Activity {
private Socket socket;
private static final int SERVERPORT = 3456;
private static final String SERVER_IP = "192.168.1.10";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new Thread(new ClientThread()).start();
}
public void sendData(View view){
try{
OutputStream objStream = socket.getOutputStream();
ObjectOutputStream ObjOpStream = new ObjectOutputStream(objStream);
byte active = 65;
byte level = (byte)150;
byte group = (byte) 255;
DataToServer data = new DataToServer();
data.setId(10);
data.setCmd(15);
data.setActive(active);
data.setLevel(level);
data.setGroup(group);
ObjOpStream.writeObject(data);
ObjOpStream.close();
objStream.close();
}catch (UnknownHostException e) {
e.printStackTrace();
}catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
class ClientThread implements Runnable {
@Override
public void run() {
try {
InetAddress serverAddress = InetAddress.getByName(SERVER_IP);
socket = new Socket(serverAddress,SERVERPORT);
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
在C服务器端,我需要接收以下代码
struct dali_payload
{
int id;
int cmd;
char active;
char level;
char group;
};
printf("Payload size: %d\n", sizeof(dp));
while(1)
{
read_size = read(client_sock ,&dp ,sizeof(dp));
if(read_size <= 0)
break;
printf("Received bytes: %d\n", read_size);
printf("Id: %x\n", (dp.id));
printf("cmd: %x\n",(dp.cmd));
printf("active: %x\n", (dp.active));
printf("level: %x\n", (dp.level));
printf("group: %x\n", (dp.group));
}
OUTPUT:
Socket created
bind done
Waiting for incoming connections...
Connection accepted
Payload size: 12
Received bytes: 2
Id: edac
cmd: 0
active: 0
level: 0
group: 0
Received bytes: 2
Id: 500
cmd: 0
active: 0
level: 0
group: 0
Received bytes: 1
Id: 573
cmd: 0
active: 0
level: 0
group: 0
Received bytes: 12
Id: 632a0072
cmd: 652e6d6f
active: 78
level: 61
group: 6d
Received bytes: 12
Id: 612e656c
cmd: 6f72646e
active: 69
level: 64
group: 73
Received bytes: 12
Id: 74656b63
cmd: 6f6d6564
active: 2e
level: 44
group: 61
Received bytes: 12
Id: 536f5461
cmd: 65767265
active: 72
level: 87
group: 2b
Received bytes: 12
Id: e51d8e7a
cmd: cc0
active: 78
level: 70
group: 77
Received bytes: 12
Id: a000000
cmd: f000000
active: 41
level: 96
group: ff
struct dali\u有效负载
{
int-id;
int-cmd;
活性炭;
煤焦水平;
半焦组;
};
printf(“有效负载大小:%d\n”,大小(dp));
而(1)
{
read_size=read(客户机_sock,&dp,sizeof(dp));
如果(读取代码中的大小)
recv(client_sock ,&dp ,1, 0);
将一次读取1
字节。很可能这不是您想要的
理想情况下,应该将提供的缓冲区的长度作为第三个参数
假设dp
定义为
struct dali_payload dp;
你可以用像
read_size = recv(client_sock ,&dp ,sizeof(dp), 0);
@Ian和我谈论的是socklen\u t*)&c
部分。它没有匹配的起始(
,当我将其格式化为一行时被删除。对此表示抱歉。请验证接收到的不是我的数据包的常量数据。只有最后12个字节是我的数据包。