barcode maker vb.net 4: You Go Squish Now! Debugging on the iPhone in Objective-C

Generator QR-Code in Objective-C 4: You Go Squish Now! Debugging on the iPhone

CHAPTER 4: You Go Squish Now! Debugging on the iPhone
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Figure 4-4 shows the output. Note that I m using the SC_LOG macro that was mentioned earlier for the output.
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Figure 4-4. Dapple running in the simulator with one of the debug #define values turned on
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Crash!
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No matter how hard you might try to write bug-free code, sooner or later you ll run into problems. Whether you experience a problem while running your app locally or one of your beta testers has a crash, you need to know how to track it down and fix it.
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Getting a Crash Log from Your Testers
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Chances are that one of your testers will find a crash you ve never seen before. After all, that s why you have other people testing your app in the first place. The first thing you ll want to do is get them to send you a crash log from their device. Ask them to plug their iPhone or iPod touch into their computer; this will transfer the crash log files to their computer. Where those files are depends on their operating system (according to the Apple Developer Connection):
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CHAPTER 4: You Go Squish Now! Debugging on the iPhone
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Mac OS X: ~/Library/Logs/CrashReporter/MobileDevice/ <Device_Name> Windows XP: C:\Documents and Settings\<Username>\Application Data\Apple computer\Logs\CrashReporter\<Device_Name> Windows Vista: C:\Users\<Username>\AppData\Roaming\Apple computer\Logs\CrashReporter\MobileDevice\<Device_Name> Have them find the crash log for your app (the one that ends in .crash) with a date and time that closely matches the time of the crash (if they can remember). If they can t remember, you can always have them send you all the crash logs with your app s name. TIP: When you have a tester send you a crash log, make sure they let you know what build number they were running. Chances are you have sent out several builds, and not every tester is going to update to the latest build. Knowing which build crashed can save you a lot of headache.
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You Have Been Saving Your dSYM Files, Right
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When you re running your app in the debugger, the reason you get nice text names for the functions in your call stack (instead of hex memory addresses) is that you have debug symbols included in the app. The iPhone does this in a great way by building your debug symbols into a file with a .dSYM extension every time you compile. You ll find it in the same directory that your .app file was generated when you built. TIP: Every time you create a build to send to testers, archive the .dSYM file along with the app! That tip is so important I m going to say it again. Every time you create a build to send to testers, archive the .dSYM file along with the app! Why is this so important It s important because the dSYM file is what will allow you to get a readable call stack from a crash log instead of just a bunch of hex memory addresses. Chances are, when a user gets a crash, the crash log they send you will contain just the memory addresses of the functions in the call stack. However, if you have the dSYM file that matches the build they were running, you can symbolicate the crash and get a human-readable call stack out of it!
Symbolicating a Crash Log
Lucky, there exists a script that will help you to symbolicate a crash! It s called symbolicatecrash. You can find it here:
/Developer/Platforms/iPhoneOS.platform/Developer/Library/Xcode/Plug-ins/
CHAPTER 4: You Go Squish Now! Debugging on the iPhone
iPhoneRemoteDevice.xcodeplugin/Contents/Resources/symbolicatecrash
NOTE: In iPhone OS 3.0, symbolicatecrash has been moved to a new location: /Developer/Platforms/iPhoneOS.platform/Developer/Library/PrivateFramew orks/DTDeviceKit.framework/Versions/A/Resources/. However, you might want to copy it into a location that s part of your path so that you can just execute it by typing symbolicatecrash into a terminal instead of the whole path. CAUTION: There are known bugs in symbolicatecrash for iPhone OS 2.x. Bryan Henry has posted a fixed version of the script at http://openradar.appspot.com/6438643. You run symbolicatecrash from the command line. Open a terminal window, and pass it a crash file as a parameter. If you need to symbolicate it against a specific dSYM file, you can pass that in as an optional parameter:
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