How to concatenate char and string on iPhone?

Question

I want to add some marks to separate some strings. How to add a char to a string?

e.g. add '\x01' to "Hello", add '\x02' before "World" and add '\x03' after "World".

So I can create a string "\x01 Hello \x02 World \x03" which has some separate marks.

Solution 1

If you want to modify a string, you have to use NSMutableString instead of NSString. There is no such need if you want to create a string from scratch.

For instance, you may want to use +stringWithFormat: method:

NSString * myString = [NSString stringWithFormat:@"%c %@ %c %@ %c",
                                                 0x01,
                                                 @"Hello",
                                                 0x02,
                                                 @"World",
                                                 0x03];

Solution 2

Hm..

You could do something like this:

NSString *hello = @"hello";
char ch [] = {'\x01'};
hello = [hello stringByAppendingString:[NSString stringWithUTF8String:(char*)ch]];

I make a a char* to append out of your single char and use stringWithUTF8String to add it.

There's probably a less long-winded way of solving it however!

Nick.

Solution 3

Not exactly sure what you're asking... But would stringWithFormat maybe help you?

E.g,

[NSString stringWithFormat:@"%c%@%c%@%c", 1, @"hello", 2, @"world", 3];

Comments

[Jean-Denis Muys]

stringWithUTF8String expects a null-terminated string, I believe, which is not what we have here.