error while sending a String from C client to Java server -

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i send integer c client java server , worked perfectly. when tried same thing string got , error client code send string

char clientstring[30];      printf("string send : \n");          if( send( to_server_socket, &clientstring, sizeof( clientstring ), 0 ) != sizeof( clientstring ) )         {             printf( "socket write failed");             exit( -1 );         }

and java code read it

datainputstream din = new datainputstream(socket.getinputstream());           string clientstring=din.readutf();            system.out.println(clientstring);

error

java.io.eofexception @ java.io.datainputstream.readfully(datainputstream.java:180) @ java.io.datainputstream.readutf(datainputstream.java:592) @ java.io.datainputstream.readutf(datainputstream.java:547) @ servicerequest.run(servicerequest.java:43) @ java.util.concurrent.executors$runnableadapter.call(executors.java:439) @ java.util.concurrent.futuretask$sync.innerrun(futuretask.java:303) @ java.util.concurrent.futuretask.run(futuretask.java:138) @ java.util.concurrent.threadpoolexecutor$worker.runtask(threadpoolexecutor.java:895) @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:918) @ java.lang.thread.run(thread.java:680)

edit :i tried using din.readline(),i don't have error anymore if type fffffff12 on client got fffffff12`?7e^Ê?h in server

readutf doesn't read bytes socket. starts reading length of string (as 16-bit integer) , reading string. problem send not required readutf work successfully.

as joachim pileborg noted, sending entire 30 bytes of clientstring (including remaining bytes not explicitly set). should send instead:

send(to_server_socket, clientstring, strlen(clientstring), 0);

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