Getting specific part of string

[wassupdoc]

I am loading images from the iphone camera roll and I need to get the specific image number of each. I have been able to get the path to each asset as follows:
assets-library://asset/asset.JPG?id=1000000035&ext=JPG

Now how would i get just the id number and strip out the leading 1s and 0s. I am assuming as my photo collection grows that id may contain 3 or 4 useful digits, so I want to make sure I remove only the 0s.

Thanks for the help

[Duncan C]

Originally Posted by wassupdoc

I am loading images from the iphone camera roll and I need to get the specific image number of each. I have been able to get the path to each asset as follows:
assets-library://asset/asset.JPG?id=1000000035&ext=JPG

Now how would i get just the id number and strip out the leading 1s and 0s. I am assuming as my photo collection grows that id may contain 3 or 4 useful digits, so I want to make sure I remove only the 0s.

Thanks for the help

NSString has a bunch of useful methods for string parsing.

rangeOfString: is where you should start.

If your path is in a string pathString, you could use code like this:

NSRange idRange = [pathString rangeOfString: @"id="];


Then you could write a while loop that skipped past a beginning "1" and some number of leading zeros.

Then you would need to calculate a range that started just after the first non-zero digit and went to the end of the string, and search the string for an "&" using rangeOfStringptions:range:locale: (That method lets you pass in a range to search inside the string. Pass zero for options, and nil for locale, since you don't need those features.) You could then calculate the range for just the digits you want, and use substringWithRange to extract the digits you want.

[wassupdoc]

Thanks Duncan!

I did some more searching after posting the question and found this:
Dimitris Doukas . Dev Blog Blog Archive Get values from parameters in an NSURL string - software development notebook

This worked perfectly to get me the id
Then using the returned string I used the following to get the int I needed

NSString *imageID = [parser valueForVariable:@"id"];
    NSString *newStr = [imageID substringFromIndex:2];
        int imageIDInt = [newStr intValue];

Originally Posted by Duncan C

NSString has a bunch of useful methods for string parsing.

rangeOfString: is where you should start.

If your path is in a string pathString, you could use code like this:

NSRange idRange = [pathString rangeOfString: @"id="];


Then you could write a while loop that skipped past a beginning "1" and some number of leading zeros.

Then you would need to calculate a range that started just after the first non-zero digit and went to the end of the string, and search the string for an "&" using rangeOfStringptions:range:locale: (That method lets you pass in a range to search inside the string. Pass zero for options, and nil for locale, since you don't need those features.) You could then calculate the range for just the digits you want, and use substringWithRange to extract the digits you want.