我如何知道在Xcode调试器（iPhone）中抛出什么异常？ [英] How do I find out what exception was thrown in the Xcode debugger (for iPhone)?

问题描述

我正在从Erica Sadun的iPhone开发者手册中学习iPhone编程。当我运行我创建的应用程序，按照模拟器中第81页开始的温度转换示例中的步骤，由于未捕获的异常而终止。 （请参阅 http://groups.google.com/group/iphonesdk / browse_frm / thread / 6f44a90fdb8da28a？hl = en 发布到iPhoneSDK Google Group的问题。）

调用UIApplicationMain（）后抛出异常，从我的主（）。如果我查看调试器中的堆栈跟踪，我看到的（当然）汇编。如何找出抛出什么样的异常？

更新：从调试器控制台了解异常的详细信息足以帮助我解决问题。 （请参阅 http://groups.google.com/group/iphonesdk / browse_frm / thread / 6f44a90fdb8da28a？hl = en 。）我验证了我可以在 objc_exception_throw 上设置一个符号断点，但是我没有看到是否

解决方案

将断点放在 objc_exception_throw 并通过调试运行您的应用程序，而不是运行

要澄清一点，当您没有断点获得异常时，您实际看到的是一致的堆栈跟踪 - 这是未捕获的异常处理程序。异常的类型被记录到运行控制台，但是如果你想看到异常引发的地方，那就是断点是什么。

I'm learning iPhone programming from Erica Sadun's The iPhone Developer's Cookbook. When I run the app I created by following the steps in the Temperature Conversion Example starting on page 81 in the simulator, it terminates due to an uncaught exception. (See http://groups.google.com/group/iphonesdk/browse_frm/thread/6f44a90fdb8da28a?hl=en for the question I posted to the iPhoneSDK Google Group.)

The exception is thrown after calling UIApplicationMain() from my main(). If I look through the stack trace in the debugger, all I see is (of course) assembly. How do I find out what kind of exception was thrown?

Update: Learning the details of the exception from the Debugger Console was enough to help me solve the problem. (See http://groups.google.com/group/iphonesdk/browse_frm/thread/6f44a90fdb8da28a?hl=en.) I verified that I could set a symbolic breakpoint on objc_exception_throw, but I didn't look to see if the backtrace from there would have been helpful.

解决方案

Put a breakpoint at objc_exception_throw and run your app via Debug instead of Run

To clarify, what you're actually seeing when you get an exception without the breakpoint is the same stack trace always - it's the uncaught exception handler. The type of exception is logged to the Run console, but if you want to see a backtrace for where the exception was raised, that's what the breakpoint is for.

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