CODEWITHSUNDEEP
objective-cparsing
Mladen
Mladen

Reputation: 25826

How to parse strings in Objective C

Can someone help me to extract int timestamp value from this string "/Date(1242597600000)/" in Objective C

I would like to get 1242597600000.

Thx

Upvotes: 7

Views: 31210

Answers (3)

Tom Jefferys
Tom Jefferys

Reputation: 13310

One simple method:

NSString *timestampString = @"\/Date(1242597600000)\/";
NSArray *components = [timestampString componentsSeparatedByString:@"("];
NSString *afterOpenBracket = [components objectAtIndex:1];
components = [afterOpenBracket componentsSeparatedByString:@")"];
NSString *numberString = [components objectAtIndex:0];
long timeStamp = [numberString longValue];

Alternatively if you know the string will always be the same length and format, you could use:

NSString *numberString = [timestampString substringWithRange:NSMakeRange(7,13)];

And another method:

NSRange openBracket = [timestampString rangeOfString:@"("];
NSRange closeBracket = [timestampString rangeOfString:@")"];
NSRange numberRange = NSMakeRange(openBracket.location + 1, closeBracket.location - openBracket.location - 1);
NSString *numberString = [timestampString substringWithRange:numberRange];

Upvotes: 15

Abizern
Abizern

Reputation: 150765

There's more than one way to do it. Here's a suggestion using an NSScanner;

NSString *dateString = @"\/Date(1242597600000)\/";
NSScanner *dateScanner = [NSScanner scannerWithString:dateString];
NSInteger timestamp;

if (!([dateScanner scanInteger:&timestamp])) {
    // scanInteger returns NO if the extraction is unsuccessful
    NSLog(@"Unable to extract string");
}

// If no error, then timestamp now contains the extracted numbers.

Upvotes: 14

Nikolai Ruhe
Nikolai Ruhe

Reputation: 81878

NSCharacterSet* nonDigits = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
NSString* digitString = [timestampString stringByTrimmingCharactersInSet:nonDigits];
return [digitString longValue];

Upvotes: 4

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