words after the same in string - iphone

Question

I am a newbie to xcode and maybe this question is silly but I am lagging with my home work. In a file I want to read a specific character after the string.
example:
asasasasasas
wewewewewewe
xyz_ 22 aaaaaaaaaaa bbbbbbbbbbb ccccccccccccccc ddddddddddddd
fgfgfgfgfgfgfg
ererererererer
abc_ 12 bbbbbbbbbb dddddddd
jkjkjkjkjkjkjk
lalallalalalal
Mycode:
NSString *contentFile = [[NSString alloc] initWithContentsOfFile:pathFile encoding:NSUTF8StringEncoding error:nil];
NSArray *lineFile = [contentFile componentsSeparatedByString:#"\n"];
NSMutableString *xmlFile = [[NSMutableString alloc] init];
for(int i = 2; i < lineFile.count; i++)//i = 2 for don't take the 2 first line
{
if ([((NSString *)[lineFile objectAtIndex:i]) rangedOfString:#"test"].location != NSNotFound){
xmlFile = [NSString stringWithFormat:#"%#<nameTag>%#</nameTag>", xmlFile, (NSString *)[lineFile objectAtIndex:i]];
}
else if ...
}
everything works fine ..
but i want to print after xyz_ ... like :
aaaaaaaaaaa
bbbbbbbbbbb
ccccccccccccccc
ddddddddddddd

Answer 1

everything works fine ..
but i want to print after xyz_ ... like :
aaaaaaaaaaa
bbbbbbbbbbb
ccccccccccccccc
ddddddddddddd
I hope to have understood correctly what you want to do:
if ([([lineFile objectAtIndex:i]) rangedOfString:#"test"].location != NSNotFound)
{
xmlFile = [NSString stringWithFormat:#"%#<nameTag>%#</nameTag>", xmlFile, (NSString *)[lineFile objectAtIndex:i]];
NSString* str= [[lineFile objectAtIndex: i]stringByReplacingOccurrencesOfString: #"xyz_ " withString: #""];
NSLog(#"%#",[str stringByReplacingOccurrencesOfString: #" " withString: #"\n"]);
}

Answer 2

you can try this as well: (would recommend to try in a separate test app)
I am assuming your target line:
xyz_ 22 aaaaaaaaaaa bbbbbbbbbbb ccccccccccccccc ddddddddddddd
always starts with "xyz_ 22". Check out here: (see comments also)
// prepared a string similar to what you already have
NSMutableString *xmlfile = [[NSMutableString alloc] initWithFormat:#"%#\n%#\n%#\n%#\n%#\n%#\n%#\n%#\n%#",
#"asasasasasas",
#"wewewewewewe",
#"xyz_ 22 aaaaaaaaaaa bbbbbbbbbbb ccccccccccccccc ddddddddddddd",
#"fgfgfgfgfgfgfg",
#"ererererererer",
#"",
#"abc_ 12 bbbbbbbbbb dddddddd",
#"jkjkjkjkjkjkjk",
#"lalallalalalal"];
NSLog(#"%#", xmlfile); // check out by printing (optional)
NSArray *arr = [xmlfile componentsSeparatedByString:#"\n"]; // first break with NEWLINE character
NSLog(#"%#",arr); // check out by printing (optional)
for (NSString *str in arr) // traverse all lines
{
if([str hasPrefix:#"xyz_ 22"]) // if it starts with "xyz_ 22"
{
NSMutableArray *mArr = [[NSMutableArray alloc] initWithArray:[[str stringByReplacingOccurrencesOfString:#"xyz_ 22 " withString:#""] componentsSeparatedByString:#" "]];
for(int i=0; i< [mArr count];i++ )
{
NSString *tag;
if([[mArr objectAtIndex:i] length] > 3)
{
// If more than three i.e., aaaaa then write <aaa>aaaaaaa<aaa>
tag = [[mArr objectAtIndex:i] substringWithRange:NSMakeRange(0, 3)];
}
else
{
// If less than three i.e., aa then pick <aa>aa<aa> or
a then pick <a>a<a>
tag = [mArr objectAtIndex:i];
}
NSString *s= [[NSString alloc] initWithFormat:#"<%#>%#<%#>", tag, [mArr objectAtIndex:i], tag];
[mArr removeObjectAtIndex:i];
[mArr insertObject:s atIndex:i];
}
NSLog(#"%#", mArr); // prints output
}
}
If start of line do not fixed with "xyz_ 22", you need to have a look at NSRegularExpression class and use it instead of using hasPrefix.
This sample pattern can help you:
#"^(.{3}\_\s*\d{2}\s*)"
This pattern matches any line that has three characters followed by an underscore and space(s) followed by two digits followed by space(s).
You can use either of these functions then as per your need:
firstMatchInString:options:range:
matchesInString:options:range:
numberOfMatchesInString:options:range:
Hope it helps.
Happy coding and reading!!!
EDIT:
I have updated code but i have doubt on the no. of characters in a tag you specified in comment. well this will give you an idea on how to work around this issue.

Answer 3

String "test" is not present in the string to be formatted .Try to remove it and then try with [contentFile componentsSeparatedByString#" "]

Answer 4

If you want to break the string by new line, try this one :
NSArray *lineFile=[contentFile componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];
instead of
NSArray *lineFile = [contentFile componentsSeparatedByString:#"\n"];