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  • 查找 EXC_BAD_ACCESS 问题根源的方法

     

    MallocStackLogging 的设置方法 查找 EXC_BAD_ACCESS 问题根源的方法 

    分类: iphone

    IOS 开发中,如果提前释放一个指针的内存,在以后还继续使用这个指针,那么程序会立刻 crash 掉,而且很难有报错信息,我以前都是靠猜测去判断错误的原因,我们应该利用工具去找到错误的地方,然后快速准确的定位到错误地方,及其错误原因,最后进行改进。

        其实 iOS 控制台提供这种机制,如果你选择 debug 模式(必须在这个模式下),在程序 crash 之后,在控制台输入 bt,就可以显示 crash 堆栈:

        Program received signal:  “EXC_BAD_ACCESS”.
        warning: Unable to read symbols for /Developer/ios4.2.1/Platforms/iPhoneOS.platform/DeviceSupport/4.2.1 (8C148)/Symbols/Developer/usr/lib/libXcodeDebuggerSupport.dylib (file not found).
        (gdb) bt
        #0  0x33a06464 in objc_msgSend ()
        #1  0x3139de2e in -[UIImageView setImage:] ()
        #2  0x00009ecc in -[RoundMenuView touchesEnded:withEvent:] (self=0x29e140, _cmd=0x316b1a7b, touches=0x2e1050, event=0x2424f0) at /Users/wangjun/workspace/iphone/Classes/RoundMenuView.m:130
        #3  0x313b1354 in -[UIWindow _sendTouchesForEvent:] ()
        #4  0x313b0cce in -[UIWindow sendEvent:] ()
        #5  0x3139bfc6 in -[UIApplication sendEvent:] ()
        #6  0x3139b906 in _UIApplicationHandleEvent ()
        #7  0x31eecf02 in PurpleEventCallback ()
        #8  0x304236fe in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ ()
        #9  0x304236c2 in __CFRunLoopDoSource1 ()
        #10 0x30415f7c in __CFRunLoopRun ()
        #11 0x30415c86 in CFRunLoopRunSpecific ()
        #12 0x30415b8e in CFRunLoopRunInMode ()
        #13 0x31eec4aa in GSEventRunModal ()
        #14 0x31eec556 in GSEventRun ()
        #15 0x313cf328 in -[UIApplication _run] ()
        #16 0x313cce92 in UIApplicationMain ()
        #17 0x00002da2 in main (argc=1, argv=0x2fdff44c) at /Users/wangjun/workspace/iphone/main.m:19
        kill
        quit

        利用堆栈信息,就可以准确的定位到错误地方。

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  • 原文地址:https://www.cnblogs.com/woaixixi/p/4807800.html
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