nsstrings_darwin.go RawHistoryFolder

1// SPDX-License-Identifier: Apache-2.0
2// SPDX-FileCopyrightText: 2026 The Ebitengine Authors
3
4package cstrings
5
6import (
7	"fmt"
8
9	"github.com/bnema/purego"
10	"github.com/bnema/purego/internal/strings"
11	"github.com/bnema/purego/objc"
12)
13
14var (
15	sel_isKindOf   objc.SEL
16	sel_UTF8String objc.SEL
17
18	class_NSString objc.Class
19)
20
21func init() {
22	// Must pull in Foundation to get the NSString class.
23	_, err := purego.Dlopen("/System/Library/Frameworks/Foundation.framework/Foundation", purego.RTLD_GLOBAL|purego.RTLD_NOW)
24	if err != nil {
25		panic(fmt.Errorf("cstrings: %w", err))
26	}
27	sel_isKindOf = objc.RegisterName("isKindOfClass:")
28	sel_UTF8String = objc.RegisterName("UTF8String")
29	class_NSString = objc.GetClass("NSString")
30}
31
32// NSStringToString returns a copy of the NSString contents as a Go string.
33// If the ID is 0 then an empty string is returned.
34// If the ID is not an NSString class then the function panics.
35// This function is only available on darwin.
36func NSStringToString(str objc.ID) string {
37	if str == 0 {
38		return ""
39	}
40	if str.Send(sel_isKindOf, class_NSString) == 0 {
41		panic("cstrings: provided ID is not an NSString")
42	}
43	return strings.GoString(uintptr(str.Send(sel_UTF8String)))
44}