On Jul 22, 2008, at 8:49 PM, Jeff Brown wrote:
Sorry - it should have been:
- (void) aMethod
{
NSString* string1 = @"";
NSString* string2 = @"";
string1 = [self foo:string2];
}
- (NSString*) foo:(NSString*)aString
{
NSString* stringA = @"Hi there";
NSString* stringB = @"Everyone";
aString = stringB;
return stringA;
}
I need to get 2 strings back from foo. I can get foo to return one.
I need to pass the other one in by reference.
Alternatives to consider:
*) Have the method return an NSArray* containing the strings
*) Have the method return a struct which has two NSString* fields
*) Have a method such as:
- (void) getGreeting:(NSString**)greeting andAdressee:
(NSString**)addressee;
That is, if you're going to write a get-style method, probably better
to have it supply both outputs through by-reference parameters than to
supply one via by-reference parameter and another via return value.
It seems that since I'm passing a pointer to an NSString as the
argument, it should be fine but it's not.
It was doing exactly what you told it to. In your original code, you
had a variable aString which was a pointer to an NSString object.
Your code then assigned a different value to the pointer, making it
point to a different object. However, aString is local to the -foo:
method. Changing what it pointed to did not affect the pointer
theString in aMethod. (At the point where -foo: was called, the
contents of the theString variable was copied to the aString variable
in the new context. After that copy the two variables are entirely
independent. They both initially pointed to the same object, but that
changed when you assigned a new pointer to aString.)
By the way
How do you reply on this mailing list so that the reply remains part
of the thread?
I generally just do a Reply All.
Cheers,
Ken
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