NSArray element to NSString - ios

Question

I have application where I receive from socket message like: "\r\nIDLE|03/17/2013 19:48\n". I convert this message into UTF8 string with code:
NSString* newStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
then I try to separate command and time from this string:
NSArray *nums = [command componentsSeparatedByString:[NSString stringWithFormat:#"%c", (char)13]];
NSLog(#"First separate = %#", nums);
if ([nums count] == 3)
{
NSArray *nums1 = [[nums objectAtIndex:1] componentsSeparatedByString:#"|"];
NSLog(#"second separate = %#", nums1);
if ([nums1 count] == 2)
{
NSString* strState = [(NSString *)[nums1 objectAtIndex:0] description];
NSLog(#"State = %#", strState);
...
}
}
in the log I see next:
First separate = (
"IDLE|03/17/2013 19:48",
"\n"
second separate = (
"IDLE",
"03/17/2013 19:48"
State = I
After second separating in the 0 elements I have text IDLE, but when I try to get this text I strState variable, I see only first character of this text.
Can anybody help me get full command of this element?
Thank you.
UPDATE1
As I say previously I get from socket message like:"\r\nIDLE|03/17/2013 19:48\n"
I'm sure that the server send me this message.
in the Socket read callback I'm use next code for reading this message:
int result = CFReadStreamRead(_inputStream, (UInt8*)[data mutableBytes], length);
NSString* newStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
Here app read 50 bytes and this is right for this message? you can see my debugger at this point in the next picture:
but in the newStr member I see only \r.
then I send try separate this message with code I wrote above.
When I try separate message logger show me all message instead of \r:
Thank you

Answer 1

Have you considered using sscanf()?
char command[COMMAND_SIZE_LIMIT];
char date[DATE_SIZE_LIMIT];
char time[TIME_SIZE_LIMIT];
sscanf (input, "\r\n%[^|]%*[|]%s%s\n", command, date, time);
(Note: Above is example code; you've got a security issue if the scanned string has oversized command or datetime substrings.)
# test
ebg#ebg$ ./foo
Input: '
IDLE|03/17/2013 19:48
'
Command: 'IDLE'
Date: '03/17/2013'
Time: '19:48'
It is easy to convert NSString <==> C string.

Answer 2

There is a fairly straightforward way to accomplish what you want using the -[NSString stringByTrimmingCharactersInSet:] method. Passing the whitespace and newline character set allows you to trim the leading and trailing whitespace and newlines from your string, and then you only need to do a single call to componentsSeparatedByString:.
NSString *raw = #"\r\nIDLE|03/17/2013 19:48\n";
NSString *trimmedString = [raw stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
NSArray *components = [trimmedString componentsSeparatedByString:#"|"];
NSString *command = components[0];
NSString *time = components[1];
NSLog(#"command = %#, time = %#",command,time);
This code yields the following output:
command = IDLE, time = 03/17/2013 19:48