[Mono-osx] Help marshaling NSFormatter method

Geoff Norton grompf at gmail.com
Fri Aug 26 21:09:55 EDT 2011

ByRef strings are currently not supported (NSString should work tho).  Please file a bug and assign it to me.


On 2011-08-26, at 9:06 PM, Mattiello Joseph wrote:

> NSFormatter uses a lot of output parameters of types like NSString **. I've found that when NSError** 's are used mono uses "out NSError". I've tried doing the same with both "out string" and "out NSString" but I continue to get bus errors with the following.
>        [Export ("isPartialStringValid:newEditingString:errorDescription:")]
>        public bool IsPartialStringValid(string partialString, out string newString, out string error){
>            error = "";
>            newString = "";
>            if(partialString.Length <= this.length)
>                return true;
>            newString = partialString.Substring(0, this.length);
>            return false;
>        }
> I've also tried with out NSString newString where newString = new NSString("foo");
> I only get a bus error when encountering the false case immediately after return. I'm assuming that Cocoa isn't able to understand the memory passed to it. I haven't been able to backtrack in gdb, maybe I'm doing it wrong.
> Any help would be greatly appreciated. This is driving me nuts. And the NSFormatter class is actually incomplete on a method that also uses NSString** so I'll pass any input forward to fix that.
> Many thanks,
> - Joe
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