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objc: Add function to convert NSString to Go string #438
Description
Operating System
- Windows
- macOS
- Linux
- FreeBSD
- Android
- iOS
What feature would you like to be added?
A function that converts from NSString to a Go string
// NSStringToString returns a copy of the contents of an NSString into a Go string
// If the ID is 0 then an empty string is returned.
// If the ID is not an NSString class then the function panics.
func NSStringToString(str ID) string {
if str == 0 {
return ""
}
if str.Send(selIsKindOf, nsStringClass) == 0 {
return panic("objc: provided ID is not an NSString")
}
return strings.GoString(uintptr(str.Send(selUTF8String)))
}Why is this needed?
This is a common operation that people want to do and it is easy to do incorrectly.
I originally did it wrong in this PR by using length which is UTF-16 codepoint instead of utf8 length.
It is also currently wrong here.
Reacted by Hajime Hoshi
Activity
hajimehoshi commentedon Mar 12, 2026
Oops, is this a bug..?
hajimehoshi commentedon Mar 12, 2026
I agree this should be a very useful utility function
TotallyGamerJet commentedon Mar 12, 2026
Technically, yes but I don't think it'd cause any issues since I don't think the NSAppearance returns any non-ascii characters. That is only the case where the UTF-16 code point length returned from the length selector would differ from the UTF-8 code point length.
hajimehoshi commentedon Mar 12, 2026
Sure. I'll fix this asap, but if NSStringToString is introduced, I'll use it.
internal/colormode: fix wrong byte length for NSString UTF-8 conversion
cstrings: add NSStringToString (ebitengine#447)
all: use cstrings.NSStringToString