StringBuilder

Elements Elements RTL
1

Hi,

In RTL2 for toffee stringbuilder is mapped to Foundation.NSMutableString. On a stringbuilder I can do ToString. Where does ToString come from ? It’s not part of the StringBuilder class, on NSString or NSObject.

It looks like on watchos it doesnt exist, I get

‘NSInvalidArgumentException’, reason: ‘-[__NSCFString ToString]: unrecognized selector sent to instance 0x600002afcf60’

terminating with uncaught exception of type NSException

CoreSimulator 783.5 - Device: Apple Watch Series 7 - 45mm

Cheers,
John

2

ToString should map to description on Cocoa, unless explicitly implemented/overriden.

Hmm. same is fine on macOS or iOS, or you didn’t test?

3

Thanks. Yes I tested on macos

That error is saying that the method doesnt exist ?

4

yeah, ToString won’t exist, it’s called description, the compiler should handle this. I’ll try too. Island or Toffee V1 or ToffeeV2?

5

FWIW, this is fine for me on Toffee/macOS:

      writeLn('The magic happens here.');
      var x := new StringBuilder;
      x.Append("Hello");
      writeLn($"x {x}");
      writeLn($"x.ToString {x.ToString}");

but it might also matter how you call ToString/how ToString gets called implicitly.

Update also fine on ToffeeV2 and pure Island (macOS; im not in a position to test watchOS without losing a day and my sanity :wink:

6

Its Toffee v1. It also works for me with macos.

The stack seems to indicate its coming from JsonTokenizer in the parse method. I’ll have a go later will just a simple example and see if that works.

7

:(. thats gonna make this tricky.

Can you share this stack, and the line of user code that it starts with?

8

I’ll create an example that just uses stringbuilder and see if that has the same issue

1 Like
9

Screen Shot 2022-01-04 at 3.04.18 PM
ToffeeWatchLibrary.zip (110.6 KB)
That is my static library. Im just building the Toffee watch os version

This is swift xcode project

10

Logged as bugs://E25606.

11

thanx.

if you replace exit with

writeLn(builder);
//writeLn(builder.ToString);
result := builder as Stting

does it work? (even if you cant see the writeLn probably):?

      var builder := new StringBuilder;
      builder.Append('hello ');
      builder.Append('from ');
      builder.Append('StringBuilder');
      exit builder.ToString;
12

result := builder as String

worked

13

So this is a little trickier than it sounds. ToString is an extension method:

extension method Foundation.NSObject.ToString: PlatformString;public;
begin
  result := description;
end;

@mh I think this will need debugging on a watch.

15

John: are you linking in libToffee for this one?

16

Yes I am

17

damn. SOund slike maybe a linker issue eliminating the symbol :(.

18

Can you send me your wacthOS exe binary?

19

MyWatchApp WatchKit Extension.appex.zip (627.6 KB)

20

Do you have -ObjC in the linker flags in Xcode? if not, can you add it?

21

I dont and it fixes it :slight_smile: What does that do ?