Java bufferedreader -- how to read carriage return/new line sent over network from C

texasone · 01-19-2012, 11:17 PM

Basically, I have a server in C that is sending a string of text over the using write. Then I have a client written in Java that is receiving the string and updating the text in a JTextArea. The problem I am having is that when I send the string, all carriage returns or new lines are lost and its just sending it as one long line. Does anyone know how to fix this or a little workaround hack for it?
C server code:

Code:

struct meeting newMeet; 
newMeet = agenda(); 
char * s = NULL; 
ticks = time(NULL); 
snprintf(buffer, BUFFER_SIZE, "%.24s \r\n%s, %s at %d in %s. %s is on the agenda.\r\n",
ctime(&ticks), newMeet.event, newMeet.day, newMeet.time, newMeet.where, newMeet.agenda);
buffer_length = strlen(buffer); 
if (write(connection_handle, buffer, buffer_length) != buffer_length) { 
    perror("Write failed"); 
}

Java Client Code:

Code:

InetAddress serverAddress = InetAddress.getByName(host);
Socket clientSocket = new Socket(serverAddress, port);
InputStream input= clientSocket.getInputStream();

BufferedReader r = new BufferedReader( new InputStreamReader(input)); 
String s ; 
String text = ""; 
while ( (s = r.readLine()) != null) {
     text = text + s; 
} 
infoArea.setText(text + "\r\n" + TilMeet);

Let me know if you need the full code. Thanks in advance, RzITex

Nominal Animal · 01-20-2012, 03:05 AM

Since Java readLine() does not include the newline in the results, you'll need to add it back yourself:

Code:

text = text + s + "\n";

EDIT: As Proud noted below, JTextArea lines should be separated by \n and not by \r\n as I initially had. Thanks, Proud, for the heads-up.

Proud · 01-20-2012, 08:15 AM

I would suggest the system-specific newline char sequence, but then...

Quote:

Code:

public static String newline = System.getProperty("line.separator");

When NOT to use the system independent newline characters

JTextArea lines should be separated by a single '\n' character, not the sequence that is used for file line separators in the operating system.

Console output (eg, System.out.println()), works fine with '\n', even on Windows.