GPS Java Problem

Chardee MacDennis

hey i have posted in this problem before and i have meet another problem, basically i am trying to read in via bluetooth from a gps device but the data i am getting doesnt seem to be right.

this is the output am getting from the code:

avetanaBluetooth version 1.3.6
2006-03-20 16:35:18.972 java[2591] *** _NSAutoreleaseNoPool(): Object 0x3195c0 of class NSCFString autoreleased with no pool in place - just leaking
[52, 44, 87, 44, 48, 46, 48, 48, 44, 44, 50, 48, 48, 51, 48, 54, 44, 44, 42, 49, 50, 13, 10, 36, 71, 80, 86, 84, 71, 44, 44, 84, 44, 44, 77, 44, 44, 78, 44, 44, 75, 42, 52, 69, 13, 10, 36, 71, 80, 71, 71, 65, 44, 49, 54, 51, 53, 49, 50, 46, 53, 52, 51, 44, 53, 51, 50, 50, 46, 53, 48, 53, 50, 44, 78, 44, 48, 48, 54, 50, 50, 46, 57, 49, 48, 52, 44, 87, 44, 48, 44, 48, 48, 44, 53, 48, 46, 48, 44, 48, 46, 48, 44, 77, 44, 44, 44, 49, 46, 50, 44, 48, 48, 48, 48, 42, 48, 65, 13, 10, 36, 71, 80, 71, 83, 65, 44, 65, 44, 49, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 53, 48, 46, 48, 44, 53, 48, 46, 48, 44, 53, 48, 46, 48, 42, 48, 53, 13, 10, 36, 71, 80, 71, 83, 86, 44, 51, 44, 49, 44, 48, 57, 44, 49, 51, 44, 55, 53, 44, 49, 54, 56, 44, 50, 54, 44, 48, 52, 44, 54, 55, 44, 50, 54, 51, 44, 44, 50, 55, 44, 54, 51, 44, 49, 48, 55, 44, 44, 48, 56, 44, 53, 57, 44, 49, 51, 50, 44, 42, 55, 57, 13, 10, 36, 71, 80, 71, 83, 86, 44, 51, 44, 50, 44, 48, 57, 44, 50, 52, 44, 53, 51, 44, 49, 54, 51, 44, 44, 49, 48, 44, 51, 52, 44, 49, 50, 54, 44, 44, 48, 50, 44, 50, 57, 44, 50, 48, 49, 44, 44, 50, 48, 44, 50, 51, 44, 48, 57, 51, 44, 51, 57, 42, 55, 70, 13, 10, 36, 71, 80, 71, 83, 86, 44, 51, 44, 51, 44, 48, 57, 44, 50, 54, 44, 48, 54, 44, 50, 53, 50, 44, 42, 52, 55, 13, 10, 36, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
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Local name The Prince
Local address 00-0d-93-11-a6-b2
Device class 0
Possibilities array 3F
License-ID 2279

when i should be getting output like this:

$GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47

which when i hooked up to a proper programme i got, anyone know why? i can post the code if it helps but here is where i read an convert the data:

while(position<info.length){
			try {
				byte buffer[] = new byte[500];
				InputStream is = connection.openInputStream();
				// read data from the device
				is.read(buffer);	
				System.out.println(java.util.Arrays.toString(buffer));
				info[position] = java.util.Arrays.toString(buffer);
				position++;
			} catch(IOException e) {
				e.printStackTrace();
				// conn=false;
			}
		}

any help would be great guys thanks again!!

aidan_walsh

Javadoc for java.util.Arrays.toString(byte[])

Returns a string representation of the contents of the specified array. The string representation consists of a list of the array's elements, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Elements are converted to strings as by String.valueOf(byte). Returns "null" if a is null.

You're writing the object, not the string.

Also, unless you have a specific reason to, creating a new stream in every loop iteration is a good way to kill the stack when you have a large amount of information coming in like this.

Chardee MacDennis

so the inputstream should be created outside the while loop. so it all should look like this:

byte buffer[] = new byte[500];
InputStream is = connection.openInputStream();
while(position<info.length){
			try {
				
				// read data from the device
				// write to new array
			} catch(IOException e) {
				e.printStackTrace();
				// conn=false;
			}
		}

also how do i write get the individual elements into their correct format? i kinda lost of the whole toString part...

thanks

timeout

output your buffer to see what is being captured. Use a for loop
for(i =0; i<500;i++){
System.out.print(buffer);
}

Chardee MacDennis

when i do that or even when i use String.valueOf(byte) i just get the same numbers, just without the brackets and commas..

aidan_walsh

???

There is no String.valueOf(byte b) in either 1.4 or 5.0...

Have you really not tried String s = new String(buffer) to see what that produces?