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How to parse a log file
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How to parse a log file


  • Subject: How to parse a log file
  • From: Gabriel Zachmann via Cocoa-dev <email@hidden>
  • Date: Mon, 26 Oct 2020 23:01:21 +0100

From a user, I received a log file that contains an error (see below)
and a stack trace of my macOS app.

Is it possible to determine the exact line in the source code where the error
occurred?

Best regards, Gabriel


Encl:
excerpt from log.
"ArtSaverApp"  is my macOS app.


2020-10-23 10:47:30.410560-0400 0x2318d    Error       0x0
6750   0    ArtSaverApp: (AppKit) [com.apple.AppKit:General] ***
-[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object
from objects[0]
2020-10-23 10:47:30.433412-0400 0x2318d    Error       0x0
6750   0    ArtSaverApp: (AppKit) [com.apple.AppKit:General] (
        0   CoreFoundation                      0x00007fff2d796b57
__exceptionPreprocess + 250
        1   libobjc.A.dylib                     0x00007fff664475bf
objc_exception_throw + 48
        2   CoreFoundation                      0x00007fff2d84559e
-[__NSCFString characterAtIndex:].cold.1 + 0
        3   CoreFoundation                      0x00007fff2d8438c4
-[__NSPlaceholderArray initWithCapacity:].cold.1 + 0
        4   CoreFoundation                      0x00007fff2d69a8ae
-[__NSPlaceholderArray initWithObjects:count:] + 154
        5   CoreFoundation                      0x00007fff2d6fff7e
__createArray + 47
        6   CoreFoundation                      0x00007fff2d6fff41 +[NSArray
arrayWithObject:] + 25
        7   ArtSaverApp                         0x0000000109f12466 ArtSaverApp
+ 46182
        8   ArtSaverApp                         0x0000000109f1598d ArtSaverApp
+ 59789
        9   AppKit                              0x00007fff2abcd7a7
-[NSApplication(NSResponder) sendAction:to:from:] + 299
        10  AppKit                              0x00007fff2abcd642 -[NSControl
sendAction:to:] + 86
        11  AppKit                              0x00007fff2abcd574 __26-[NSCell
_sendActionFrom:]_block_invoke + 136
        12  AppKit                              0x00007fff2abcd476 -[NSCell
_sendActionFrom:] + 171
        13  AppKit                              0x00007fff2abcd3bd
-[NSButtonCell _sendActionFrom:] + 96
        14  AppKit                              0x00007fff2abc969b
NSControlTrackMouse + 1745
        15  AppKit                              0x00007fff2abc8fa2 -[NSCell
trackMouse:inRect:ofView:untilMouseUp:] + 130
        16  AppKit                              0x00007fff2abc8e61
-[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] + 691
        17  AppKit                              0x00007fff2abc81dd -[NSControl
mouseDown:] + 748
        18  AppKit                              0x00007fff2abc65f0
-[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] + 4914
        19  AppKit                              0x00007fff2ab30e21
-[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 2612
        20  AppKit                              0x00007fff2ab301c9
-[NSWindow(NSEventRouting) sendEvent:] + 349
        21  AppKit                              0x00007fff2ab2e554
-[NSApplication(NSEvent) sendEvent:] + 352
        22  AppKit                              0x00007fff2a97b5bf
-[NSApplication run] + 707
        23  AppKit                              0x00007fff2a94d396
NSApplicationMain + 777
        24  libdyld.dylib                       0x00007fff675efcc9 start + 1
)



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