Question

I have a program that takes characters from the buffer to form a string.

My program is:

while (i < 5) {
    ch = inStream.read();
    buffer.append((char)ch);
    i++;
}
data = buffer.toString();

For my program above, I can only take 5 characters to form a string. What I want to do is have a variable length of string. The length of the string will depend on the detection of <CR>. The serial device I am using always terminates the data by <CR>. By doing it, my string can have any length.

Problem solved. Here’s what I tried and worked perfectly – assuming 300 is my max and i want to detect /n as well.

My code:

while (i < 300) {
    ch = inStream.read();
    if ((ch=='\r')||(ch=='\n')) {
        i = 300;
    }
    buffer.append((char)ch);
    i++;
}
data = buffer.toString();

Answer 1

Assuming you mean with <CR> “Carriage Return”, you should use BufferedReader:

BufferedReader reader = new BufferedReader(inStream);
String line = null
while ((line = reader.readLine()) != null) {
    // do something with `line`

}