How to grab values from unformatted string in ios objective-c? - ios

Question

I want to pick all the measurement values from below string and need to store into one array. I am getting this type of string from machine whoes name is "Kane". when I connected with this machine using bluetooth at that time I am getting this type of string. I am able to print this string into console. but I am not able to retrive values from this string and I want to store into an array. Can anyone please help me out. Thanks
i want to store values of [serial no,Log No,DATE,TIME,CO2,CO,CO2,CO2,CO,CO/CO2,T1,T2,DELTA] in one single array, like: [12345,0002,23/02/18,17:43:16, -0.00,0,0.00,-0.00,0,0.000,-N\F-,-N\F-,-N\F-].
here is the string which i actually get from machine and print into textview:
KANE458 SW19392 V1.13
SERIAL No. 12345
LOG No. 0002
DATE 23/02/18
TIME 17:43:16
------------------------
NEXT CAL 11/12/18
------------------------
COMMISSION TEST
------------------------
ANALYSER ZERO
-------------
CO2 % -0.00
CO ppm 0
FLUE INTEGRITY
--------------
CO2 % 0.00
MAX GAS FLOW
------------
CO2 % -0.00
CO ppm 0
CO/CO2 0.0000
MIN GAS FLOW
------------
CO2 % -0.00
CO ppm 0
CO/CO2 0.0000
FLOW & RETURN
-------------
T1 (null)C -N\F-
T2 (null)C -N\F-
DELTA (null)C -N\F-
I want an array containing everything after the last space character from every line

Answer 1

Edited Answer:
OK - so you want the "last word" of each line.
But ---- we assume you want to ignore lines that don't have a "value" at the end. So:
split the string into an array of "lines"
create a list of lines to ignore
loop through the array of lines
IF the line is in the ignore list, ignore it
else, get the last word and add it to our "last words" array
So...
NSString *searchedString = #"KANE458 SW19392 V1.13\n\nSERIAL No. 12345\n\nLOG No. 0002\n\nDATE 23/02/18 \nTIME 17:43:16\n\n------------------------\nNEXT CAL 11/12/18\n------------------------\n\nCOMMISSION TEST\n------------------------\n\nANALYSER ZERO\n-------------\nCO2 % -0.00\n\nCO ppm 0\n\nFLUE INTEGRITY\n--------------\n\nCO2 % 0.00\n\nMAX GAS FLOW\n------------\nCO2 % -0.00\nCO ppm 0\nCO/CO2 0.0000\n\nMIN GAS FLOW\n------------\nCO2 % -0.00\n\nCO ppm 0\n\nCO/CO2 0.0000\n\nFLOW & RETURN\n-------------\nT1 (null)C -N\F-\n\nT2 (null)C -N\F-\n\nDELTA (null)C -N\F-\n";
// lines to ignore, because they have no "values"
NSString *ignoreLines = #"COMMISSION TEST,ANALYSER ZERO,FLUE INTEGRITY,MAX GAS FLOW,MIN GAS FLOW,FLOW & RETURN";
// initialize an array for the last "word" from each line
NSMutableArray *arrayOfLastWords = [NSMutableArray array];
// split string into an array of "lines"
NSArray *arrayOfLines = [searchedString componentsSeparatedByString:#"\n"];
// for each "line"
for (NSString *s in arrayOfLines) {
// see if this line is listed as one of the lines to ignore
NSRange ignoreRange = [ignoreLines rangeOfString:s];
// if not found, then we want to get the last "word"
if (ignoreRange.location == NSNotFound) {
// find last space character
NSRange range = [s rangeOfString:#" " options:NSBackwardsSearch];
// if the line has a space
if (range.location != NSNotFound) {
// gett the last "word" - everything after the last space
NSString *result = [s substringFromIndex:range.location+1];
// append it to our array of last words
[arrayOfLastWords addObject:result];
}
}
}
NSLog(#"\n%#", arrayOfLastWords);
Gives a resulting array of:
(
"V1.13",
12345,
0002,
"",
"17:43:16",
"11/12/18",
"-0.00",
0,
"0.00",
"-0.00",
0,
"0.0000",
"-0.00",
0,
"0.0000",
"-NF-",
"-NF-",
"-NF-"
)
If you don't want the "V1.13" from the first line, just skip processing the first line.
If you don't know that the string will be returned with newLine separators, or if you don't know what strings will be returned that you need to ignore, then you need to write some additional code to split the string on various separators, and come up with criteria of what constitutes a "line with a value".
Original Answer:
You could do this with a "brute force" approach:
Split the string into an array of "lines"
loop through the lines
check the first "word" in each line
if it matches "CO2" or "T1", get the rest of the line (skipping spaces) and add it to an array
Or, you could use Regular Expressions. This is a partial approach:
NSString *searchedString = #"KANE458 SW19392 V1.13\n\nSERIAL No. 12345\n\nLOG No. 0002\n\nDATE 23/02/18 \nTIME 17:43:16\n\n------------------------\nNEXT CAL 11/12/18\n------------------------\n\nCOMMISSION TEST\n------------------------\n\nANALYSER ZERO\n-------------\nCO2 % -0.00\n\nCO ppm 0\n\nFLUE INTEGRITY\n--------------\n\nCO2 % 0.00\n\nMAX GAS FLOW\n------------\nCO2 % -0.00\nCO ppm 0\nCO/CO2 0.0000\n\nMIN GAS FLOW\n------------\nCO2 % -0.00\n\nCO ppm 0\n\nCO/CO2 0.0000\n\nFLOW & RETURN\n-------------\nT1 (null)C -N\F-\n\nT2 (null)C -N\F-\n\nDELTA (null)C -N\F-\n";
NSError *error = nil;
NSRange searchedRange = NSMakeRange(0, [searchedString length]);
// search for "CO2" at the start of a line, and capture everything to the end of the line
NSString *pattern = #"\\nCO2\\s*([^\\n\\r]*)";
NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern: pattern options:0 error:&error];
NSArray* matches = [regex matchesInString:searchedString options:0 range: searchedRange];
// for each found match, skip spaces and save the rest of the line
for (NSTextCheckingResult* match in matches) {
NSString* matchText = [searchedString substringWithRange:[match range]];
NSRange group1 = [match rangeAtIndex:1];
[arrayOfCO2 addObject:[searchedString substringWithRange:group1]];
}
// search for "T1" at the start of a line, and capture everything to the end of the line
pattern = #"\\nT1\\s*([^\\n\\r]*)";
regex = [NSRegularExpression regularExpressionWithPattern: pattern options:0 error:&error];
matches = [regex matchesInString:searchedString options:0 range: searchedRange];
// for each found match, skip spaces and save the rest of the line
for (NSTextCheckingResult* match in matches) {
NSString* matchText = [searchedString substringWithRange:[match range]];
NSRange group1 = [match rangeAtIndex:1];
[arrayOfT1 addObject:[searchedString substringWithRange:group1]];
}
NSLog(#"");
NSLog(#"CO2:");
NSLog(#"%#", arrayOfCO2);
NSLog(#"");
NSLog(#"T1:");
NSLog(#"%#", arrayOfT1);
This is the result from the sample string you posted:
CO2:
(
"% -0.00",
"% 0.00",
"% -0.00",
"% -0.00"
)
T1:
(
"(null)C -NF-"
)

Answer 2

It seems that the string has new lines (Assuming this is a static text). This would retrieve the values:
Swift :
let stringVal = "CO2 % -23.0\n\nO2 % -0.00\n\nT1 ppm -N/_F"
let arrayNewLine = stringVal.components(separatedBy: "\n")
let strCO2 = arrayNewLine[0].components(separatedBy: " ")[0]
let strO2 = arrayNewLine[1].components(separatedBy: " ")[0]
let strT1 = arrayNewLine[2].components(separatedBy: " ")[0]
Objective C :
NSString *stringVal = #"CO2 % -23.0\n\nO2 % -0.00\n\nT1 ppm -N/_F";
NSArray *arrNewLine = [stringVal componentsSeparatedByString:#"\n"];
NSString *strCO2 = [[[arrNewLine objectAtIndex:0] componentsSeparatedByString:#" "] objectAtIndex:0];
NSString *strO2 = [[[arrNewLine objectAtIndex:1] componentsSeparatedByString:#" "] objectAtIndex:0];
NSString *strT1 = [[[arrNewLine objectAtIndex:2] componentsSeparatedByString:#" "] objectAtIndex:0];