将带有字符串数组作为参数的 glib C 方法转换为 Go

Question

我正在尝试向 gotk3/glib Go repository, but I am having troubles converting the method g_settings_set_strv 添加一些方法； C 签名是这样的：

gboolean
g_settings_set_strv (GSettings *settings,
                     const gchar *key,
                     const gchar *const *value);

这就是我在 Go 中的内容（改编复制粘贴，我不是 C 的人，只有 Java、Python 等）：

// SetStrv is a wrapper around g_settings_set_strv().
func (v *Settings) SetStrv(name string, values []string) bool {
    cstr1 := (*C.gchar)(C.CString(name))
    defer C.free(unsafe.Pointer(cstr1))

    cvalues := C.make_strings(C.int(len(values) + 1))
    defer C.destroy_strings(cvalues)

    for i, accel := range values {
        cstr := C.CString(accel)
        defer C.free(unsafe.Pointer(cstr))
        C.set_string(cvalues, C.int(i), (*C.gchar)(cstr))
    }
    C.set_string(cvalues, C.int(len(values)), nil)
    return gobool(C.g_settings_set_strv(v.native(), cstr1, cvalues))
}

但是构建失败并显示此消息：

./settings.go:246: cannot use (*C.gchar)(cstr) (type *C.gchar) as type *C.char in argument to func literal
./settings.go:249: cannot use cvalues (type **C.char) as type **C.gchar in argument to func literal

我被困在这个...

Answer 1

此代码可以正常工作并执行预期的操作：

// SetStrv is a wrapper around g_settings_set_strv().
func (v *Settings) SetStrv(name string, values []string) bool {
    cstr1 := (*C.gchar)(C.CString(name))
    defer C.free(unsafe.Pointer(cstr1))

    // cvalues := C.make_strings(C.int(len(values) + 1))
    cvalues := make([]*C.gchar, len(values))

    for i, accel := range values {
        cvalues[i] = (*C.gchar)(C.CString(accel))
        defer C.free(unsafe.Pointer(cvalues[i]))
    }
    cvalues = append(cvalues, nil)

    // C.set_string(cvalues, C.int(len(values)), nil)
    return gobool(C.g_settings_set_strv(v.native(), cstr1, &cvalues[0]))
}

感谢 tommyshem from github for his help (commit fix).

将带有字符串数组作为参数的 glib C 方法转换为 Go

Convert glib C method with string array as parameter to Go

c

glib

go