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Asked: 2026-05-11T01:10:10+00:00

I’m learning iPhone programming from Erica Sadun’s The iPhone Developer’s Cookbook. When I run

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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.

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1 Answer

  1. 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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