我编码了一个机器人，该机器人具有！clear功能，并且代码是
@client.command()
@commands.has_permissions(manage_messages=True)
async def clear(ctx, amount=5):
await ctx.channel.purge(limit=amount)
print(f'5 Messages has been deleted!')
@clear.error
async def clear_error(error, ctx):
if isinstance(error, CheckFailure):
time.sleep(0.5)
print("No Permission!")
await ctx.send(f'You have no permission!')
问题是当用户没有权限执行此操作时，等待ctx.send不能说您没有权限！ 在这个地方或其他地方等待ctx.send错误吗？
答案 0 :(得分：0)
您只需要交换参数的位置即可。第一个参数必须为
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MultiProvider(
providers: [Provider<LiraAnchor>(create: (_) => LiraAnchor())],
child: MaterialApp(
theme: ThemeData(
primaryColor: LiraColours.highlightGreen,
highlightColor: LiraColours.highlightGreen,
accentColor: LiraColours.highlightGreen,
cursorColor: LiraColours.highlightGreen,
indicatorColor: LiraColours.highlightGreen,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
debugShowCheckedModeBanner: false,
routes: {'/home': (ctx) => HomePage(), '/topup': (ctx) => TopUpPage()},
builder: (ctx, _) {
return LandingPage();
},
),
);
}
}
class LandingPage extends StatefulWidget {
LandingPage({Key key}) : super(key: key);
@override
_LandingPageState createState() => _LandingPageState();
}
class _LandingPageState extends State<LandingPage> {
final PageController _pageController = PageController();
@override
Widget build(BuildContext context) {
final mediaQuery = MediaQuery.of(context);
final double width = mediaQuery.size.width;
final double height = mediaQuery.size.height;
final List<Widget> onboarding = [
SplashPage(width: width, height: height, pageController: _pageController),
SignInPage(height: height, width: width)
];
Navigator.of(context).pushNamed('/home');
return Scaffold(
backgroundColor: Color(0xFFECF0F3),
body: LayoutBuilder(
builder: (BuildContext context, BoxConstraints viewportConstraints) {
return ConstrainedBox(
constraints: BoxConstraints(
minHeight: viewportConstraints.maxHeight,
),
child: IntrinsicHeight(
child: SingleChildScrollView(
child: Container(
width: width,
height: height,
child: PageView.builder(
controller: this._pageController,
itemCount: onboarding.length,
itemBuilder: (ctx, index) {
return onboarding[index];
}),
),
),
));
}),
);
}
}
，第二个参数为ctx。
error