NSString's Substring Crash Course 

    NSString * s1 = @"abc1234";
    NSLog(@"s1 = %@",s1);
    NSLog(@"substringFromIndex,4 : %@",[s1 substringFromIndex:4]);
    
    NSLog(@"substringToIndex,4 : %@",[s1 substringToIndex:4]);
    
    NSLog(@"substringWithRange,NSMakeRange,2,4 : %@",[s1 substringWithRange:NSMakeRange(2, 4)]);
    
    NSRange indexOfString = [s1 rangeOfString:@"bc"];
    NSLog(@"substringFromIndex,indexOfString,bc : %@",[s1 substringFromIndex:indexOfString.location]);

Will Produce the following output:

s1 = abc1234
substringFromIndex,4 : 234
substringToIndex,4 : abc1
substringWithRange,NSMakeRange,2,4 : c123
substringFromIndex,indexOfString,bc : bc1234

Comments

Post a Comment

Popular posts from this blog

Generating INSERT statement from SELECT using SQuirreL SQL

Image
There are often time during development where you would want to test your application with various type of sample data, and you would want those data to be share with other team member as well. The scenario that I ran into recently is we have some sample data that was enter to a system through a web interface, and for reports developments purposes we need those data to be shared among the team members, so we start to look into exporting those data out using SQL SELECT statements (with the correct WHERE clause) then converting them to equivalent INSERT statement; there are of cause several ways to do this, but I prefer the easy way, using SQuirreL SQL . The insert script can them be shared among the team members. Following is the steps for completing this Install  SQuirreL SQL Make sure you have  JRE7  installed on your machine Create connection to you database Depending on your database type you need to use different drivers Create the Alias to your database and enter
Read more

OneNote: We need the password to sync this notebook (Error code: 0xE4010643)

Image
It happen to me once and it happen to me twice, and it happen again this morning. When I saw this message, I knew no mater how many times I hit the "Sync All" it will never goes through (but I did it anyway). I found these happen to me if I leave OneNote open, and put the computer to hibernate / sleep mode. Somehow when the computer awake from sleep, OneNote will failed to sync due to the credentials is out of sync.  To avoid this I always close OneNote before putting the computer to sleep and often I simple shutdown the computer. The fix to this is simply delete the cached credential used by OneNote to connect to server for synchronization, and re-login. To do this, follow the following steps ( Make sure you close OneNote before you proceed) : Go to "Control Panel" > "User Accounts and Family Safety" Click "Credential Manager" Click "Manage Windows Credentials" Look for "MicrosoftOffice15_Data:live:c
Read more

Fixing the AKE BC398 USB3.0 sluggish performance

Image
Recently I've got myself a ExpressCard USB 3.0 controller ( AKE BC398 USB3.0 Card) from ebay for my almost 5 years old Lenovo T400 (amazing machine, it seem to last forever). AKE BC398 ExpressCard The card only cost me around USD $12 from ebay. Installing the card was a piece of cake; just eject the plastic piece from the ExpressCard slot and slot the card in; it fit nicely. It is a 54mm type. 1st think I tried after installing the hardware is plug my USB 3 portable hard drive ( Seagate FreeAgent ) in and copy a large file (a openSUSE iso file ~4.5GB) to the computer's desktop. To my surprise, the speed was slow, I mean snail slow! Even slower then my USB 2 port ~ 10 MB/s. I unplug the portable drive and plug the drive to my USB 2.0 port and it has ~30MB/s speed, copying the same file. After trying with several trick, plug or unplug, give it an external power, driver updates, and even reformat my Seagate FreeAgent drive, but nothing seem to work. I turn to Google
Read more