从 IronPython 异常获取回溯信息

Question

我在我的应用程序中托管了 IronPython，每当我捕获脚本抛出的异常时，我都会得到如下无用的胡言乱语：

IronPython.NewTypes.System.Exception_1$1: Error occurred during conversion ---> Microsoft.Scripting.ArgumentTypeException: expected int, got DispMethod
   at _stub_$245##245(Closure , CallSite , Object )
   at Microsoft.Scripting.Actions.MatchCaller.Call1[T0,TRet](Func`3 target, CallSite site, Object[] args)
   at Microsoft.Scripting.Actions.CallSite`1.UpdateAndExecute(Object[] args)
   at Microsoft.Scripting.Actions.UpdateDelegates.Update1[T,T0,TRet](CallSite site, T0 arg0)
   at _stub_$227##227(Closure , CallSite , Object )
   at IronPython.Runtime.Converter.Convert(Object value, Type to)
   at IronPython.Runtime.Operations.ArrayOps.SetItem(Array data, Int32 index, Object value)
   at _stub_$244##244(Closure , CallSite , Object , Object , Object )
   at Microsoft.Scripting.Actions.MatchCaller.Call3[T0,T1,T2,TRet](Func`5 target, CallSite site, Object[] args)
   at Microsoft.Scripting.Actions.CallSite`1.UpdateAndExecute(Object[] args)
   at Microsoft.Scripting.Actions.UpdateDelegates.Update3[T,T0,T1,T2,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2)
   at ConvertToFgf$223##223(Closure , Object , Object , Object )
   at _stub_$192##192(Closure , CallSite , CodeContext , Object , Object , Object , Object )
   at Microsoft.Scripting.Actions.MatchCaller.Call5[T0,T1,T2,T3,T4,TRet](Func`7 target, CallSite site, Object[] args)
   at Microsoft.Scripting.Actions.CallSite`1.UpdateAndExecute(Object[] args)
   at Microsoft.Scripting.Actions.UpdateDelegates.Update5[T,T0,T1,T2,T3,T4,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4)
   at Convert$224##224(Closure , Object , Object )
   --- End of inner exception stack trace ---
   at Convert$224##224(Closure , Object , Object )
   at _stub_$42##42(Closure , CallSite , CodeContext , Object , Object , Object )
   at Microsoft.Scripting.Actions.MatchCaller.Call4[T0,T1,T2,T3,TRet](Func`6 target, CallSite site, Object[] args)
   at Microsoft.Scripting.Actions.CallSite`1.UpdateAndExecute(Object[] args)
   at Microsoft.Scripting.Actions.UpdateDelegates.Update4[T,T0,T1,T2,T3,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2, T3 arg3)
   at Run$225##225(Closure )

我想要得到的是 python 回溯。有办法获取这些信息吗？

Answer 1

如果你只需要一个文本版本，你可以这样做：

engine.GetService<ExceptionOperations>().FormatException(exception);

如果你真的需要Python回溯对象，我建议：

Func<PythonTuple> exc_info = engine.Operations.GetMember<Func<PythonTuple>>(engine.GetSysModule(), "exc_info");

将其保存在有用的地方，然后当你需要调用它时：

TraceBack tb = (TraceBack)exc_info()[2];

只要你捕获异常，它就可以工作。

一个不太受支持但更简单的方法是：

TraceBack tb = PythonOps.GetExceptionInfoLocal(context, exception)[2];

但是您需要一个 CodeContext 来执行此操作。在 2.0 中，您可以通过以下方式获取 CodeContext：

new CodeContext(new PythonDictionary(), HostingHelpers.GetLanguageContext(engine));