如何使用命令行或以编程方式读取 "Security & Privacy" 设置

Question

我想从我的应用程序的 Preferences -> Security & Privacy -> General 选项卡中读取设置。我特别感兴趣的是用户是否设置了密码，以及是否立即需要密码 "after sleep or screen saver begins" 或延迟一段时间后才需要。

我可以通过查看其默认设置来确定屏幕保护程序何时启动。

命令行：$ defaults -currentHost read com.apple.screensaver

代码：

CFPreferencesCopyValue(CFSTR("idleTime"),
      CFSTR("com.apple.screensaver"),
      kCFPreferencesCurrentUser,
      kCFPreferencesCurrentHost);

使用相同的推理，我试图找到 "Security & Privacy" 的 plist 文件，但我无法从 /Library/Preferences/ 或 ~/Library/Preferences/ 中的任何 plist 文件中检索此设置。

我只对读取值感兴趣。所以我的问题是，这可以做到吗？如果是，怎么做？

Answer 1

如果您指定 -currentHost，则由 defaults 编辑的信息 return 仅限于对用户当前登录的主机的首选项操作（这些主机首选项可以在在 ~/Library/Preferences/ByHost）。

• Operations on the defaults database normally apply to any host the user may log in on, but may be restricted to apply only to a specific host.

• If no host is provided, preferences operations will apply to any host the user may log in on.

 -currentHost
  Restricts preferences operations to the host the user is currently logged in on.

 -host hostname
  Restricts preferences operations to hostname.

因此，为了获得您询问的信息：

$ defaults read com.apple.screensaver

通过省略 -currentHost 选项，它应该 return:

{
    askForPassword = 1;
    askForPasswordDelay = 0;
}

如果你想使用 CFPrefs:

#import <CoreFoundation/CoreFoundation.h>

#define EX_KEY "askForPasswordDelay"
#define EX_ID "com.apple.screensaver"

extern CFDictionaryRef _CFPreferencesCopyApplicationMap(CFStringRef userName, CFStringRef hostName);

int main(int argc, char *argv[])
{
    @autoreleasepool
    {
        CFURLRef current_url;
        CFStringRef path;
        CFMutableStringRef plist_path;
        CFPropertyListRef value;

        CFDictionaryRef app_map = _CFPreferencesCopyApplicationMap(
                                   kCFPreferencesCurrentUser,
                                   kCFPreferencesAnyHost);
        CFArrayRef urls = CFDictionaryGetValue(app_map, CFSTR(EX_ID));

        current_url = CFArrayGetValueAtIndex(urls, 0);
        path = CFURLCopyPath(current_url);

        plist_path = CFStringCreateMutable(kCFAllocatorDefault, 0);
        CFStringAppend(plist_path, path);
        CFStringAppend(plist_path, CFSTR(EX_ID));

        CFPropertyListRef prefs = CFPreferencesCopyValue(
        CFSTR(EX_KEY),
        CFSTR(EX_ID),
        CFSTR("kCFPreferencesCurrentUser"),
        CFSTR("kCFPreferencesAnyHost"));

        printf("CFPreferencesCopyValue \"%s\" of %s via ApplicationMap at path:\n", EX_KEY, EX_ID);
        CFShow(plist_path);
        CFShow(prefs);

        CFRelease(prefs);
        CFRelease(plist_path);
        CFRelease(path);
        CFRelease(app_map);
    }
}

输出:

CFPreferencesCopyValue "askForPasswordDelay" of com.apple.screensaver via ApplicationMap at path:
/Users/Username/Library/Preferences/com.apple.screensaver
<CFNumber 0x47 [0x7fffbf0a9d80]>{value = +0.0, type = kCFNumberFloat32Type}

↳OSX Man Pages : defaults

如何使用命令行或以编程方式读取 "Security & Privacy" 设置

How to read "Security & Privacy" settings using command line or programatically

macos

defaults