Convert Hex to ASCII number on Objective-c

Question

I have an one hexa decimal number

535443326663315634524877795678586b536854535530342f44526a795744716133353942704359697a6b736e446953677171555473

I want to convert this number to ASCII format which will look like this

STC2fc1V4RHwyVxXkShTSU04/DRjyWDqa359BpCYizksnDiSgqqUTsYUOcHKHNMJOdqR1/TQywpD9a9xhri

i have seen solutions here but none of them is useful to me NSString containing hex convert to ascii equivalent

i checked here but they give different result. Any help

have you tried the solution on the other thread? If yes, could you include that code here? — Puneet Sharma
– Puneet Sharma, Commented Sep 16, 2013 at 12:18
It seems like you want Base64 encoding. Check out stackoverflow.com/questions/882277/… — robbie_c
– robbie_c, Commented Sep 16, 2013 at 12:23
@robbie_c tried that last one , but result is different what iam getting here in branah.com/ascii-converter — Prateek sharma
– Prateek sharma, Commented Sep 16, 2013 at 12:32
NTM1NDQzMzI2NjYzMzE1NjM0NTI0ODc3Nzk1Njc4NTg2YjUzNjg1NDUzNTUzMDM0MmY0NDUyNmE3OTU3NDQ3MTYxMzMzNTM5NDI3MDQzNTk2OTdhNmI3MzZlNDQ2OTUzNjc3MTcxNTU1NDczN , its coming like this .. it should start with STC — Prateek sharma
– Prateek sharma, Commented Sep 16, 2013 at 12:38
Ah fair enough, that website seems to just convert one byte of the hex number to one ASCII character, the answer given should work. — robbie_c
– robbie_c, Commented Sep 16, 2013 at 13:09

Tim Bodeit · Accepted Answer · 2013-09-16 13:10:27Z

This works perfectly

- (NSString *)stringFromHexString:(NSString *)hexString { // The hex codes should all be two characters. if (([hexString length] % 2) != 0) return nil; NSMutableString *string = [NSMutableString string]; for (NSInteger i = 0; i < [hexString length]; i += 2) { NSString *hex = [hexString substringWithRange:NSMakeRange(i, 2)]; NSInteger decimalValue = 0; sscanf([hex UTF8String], "%x", &decimalValue); [string appendFormat:@"%c", decimalValue]; NSLog(@"string--%@",string); } _hexString1=string; NSLog(@"string ---%@",_hexString1); return string; }

TT-- · Accepted Answer · 2020-11-11 00:30:02Z

1

If you're starting with NSData * you could get the ASCII string this way:

NSData *someData = [NSData dataWithHexString:@"ABC123"]; NSString *asciiString = [[NSString alloc] initWithData: someData encoding:NSASCIIStringEncoding];

answered Nov 11, 2020 at 0:30

TT--

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3 Comments

Thomas Tempelmann Over a year ago

That doesn't work out of the box because dataWithHexString is not a function provided by Foundation. You need to add the code from NSData+HexString.m (opensource.apple.com/source/Security/Security-55471/…)

TT-- Over a year ago

Ok, good point. Btw why does the link have comment // Not efficent ?

Thomas Tempelmann Over a year ago

Perhaps because of the use of subroutines such as strtol() and the way the source string is indexed. One could access the input as a raw char array instead, which is probably faster, and convert the nibbles thru a table or a few comparisons, additions and shifts. But it's fast enough for most uses as you'll probably not convert millions of these per second.

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