将Unichar转换为Int问题

Question

I've got a strange problem trying to convert from unichar to int:

I have a String containing a few numbers, like @"12345" . This numbers I want to save individually, meaning I want 5 numbers, 1, 2, 3, ... . Now, while

NSLog(@"Value: %C", [myString characterAtIndex:0]);

returns

Value: 1

This:

NSLog(@"Value: %@", [NSNumber numberWithUnsignedChar:[myString characterAtIndex:0]]);

returns

Value: 49

I would really appreciate some help, Fabian

Answer 1

In the code above, you're getting exactly what you're asking for; the numeric value of the character '1' is 49, and you're creating an NSNumber from that.

If what you want is 1 , then you can can take advantage of the fact that the digits 0-9 are laid out in order in the ASCII/UTF-8 tables and subtract an appropriate value from the unichar you receive.

Try out this code snippet to get you started in the right direction:

NSString *s = @"0123456789";
for (int i = 0; i < [s length]; i++) {
    NSLog(@"Value: %d", [s characterAtIndex:i]);
}