无法接收放入套接字的数据（cpp中的recv）（java中的write（））

Question

I'm new to socket programming so as to test some cases I'm using a java side client to send integer data through socket and I want ot receive that data on the server side in cpp.

My code on client side (java) looks like

out=new DataOutputStream(s.getOutputStream());
ar=1;
le=1;
out.writeInt(ar);
out.flush(); 
out.writeInt(le);
out.flush();

and im using recv function in cpp to receive this data. the code on cpp side looks like

  if (int(recv(acceptFD, &number, sizeof(int), 0)) != sizeof(int))
  {
     ALOGE ("error reading on socket: number of Args: %d,reutrned value =%d\n",number);
    return;
  }

  for (int i = 0; i < number; i++) 
  {
    int len;
    if (recv(acceptFD, &len, sizeof(int), 0) != sizeof(int)) 
    {
        ALOGE ("error reading on socket: Len of Args: expected length :%d\n",len); 
         freeDebugCallbackArgs(i, args);
        return;
    }

and its showing the log as

E/RILC ( 235): error reading on socket: number of Args: 16777216, returned value =-1073741824 E/RILC ( 235): error reading on socket: Len of Args: expected length :1075093557

It would be a great help if someone posts an answer to this. Thank you

Answer 1

I stongly suspect this is a problem with the byte order.

The number 16777206 represented as hex is 0x01000000, which is 1677206 in little-endian representation, but 1 in big-endian representation.

Read your numbers as a byte array and include code to compensate for the different byte order between the Java source and C destination.