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Questions tagged [objc-message-send]

11 questions
7
votes
3 answers

Why is objc_msgSend causing an EXC_BAD_ACCESS?

I'm making a class, that given an object target, a selector to watch for, and a displayTitle will output a string in this format: @"displayTitle: object.selector". It then registers itself through KVO so that anytime the value of object.selector…
Eliza Wilson
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5
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2 answers

Interception messages in Squeak

I am trying to understand better reflection in Smalltalk. I am using the latest version of Squeak (v4.3). I want to intercept every message sent to instances of one of my classes. I assumed that I could override the method…
Yann-Gaël Guéhéneuc
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3
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1 answer

iOS 8 crash - objc_msgSend() selector name: respondsToSelector:

I have the following crash report. It only happens on iOS 8. I know exactly how to reproduce it but cannot for the life of me figure out where the problem is in my code. When I use a breakpoint and try to step through the app, the crash doesn't…
Zia
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How to pass an array to an objc method that expects var args (eg ...')

I have a method in a library that looks like so: - (id)initWithSomeObjects:(NSString *)something, ... NS_REQUIRES_NIL_TERMINATION; I'd really like to call it with an array instead of var args, because the number of objects i'd like to pass in is…
Chris
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2
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2 answers

viewing assembly code for Objective-c

I'm reading over this awesome article on friday.com. bbum shows some objective-c code and the corresponding assembly. How can I view objective-c assembly code? Assume I'm compiling from the OS X Terminal using gcc.
SundayMonday
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2
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2 answers

Basic message counting in Objective-c

In the following example how many messages are sent to myObject? - (void) myMethod:(id) myObject NSLog(@"%@", myObject.myStringProperty); NSLog(@"%@", myObject.myStringProperty); NSLog(@"%@", myObject.myStringProperty); } I'm just…
SundayMonday
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How does casting and calling obj_msgSend() not invoke undefined behavior?

I observed the usage of objc_msgSend to send messages to Objective-C IDs from pure C. The usage is not well documented but I found an example here. What I am confused by is the function pointer is casted to a different type with different arguments…
user16217248
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2
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1 answer

SIGSEGV 'SEGV_MAPERR' crash inside my app that is on apple store

My app is on app store and i have enabled critticism inside my app. Following crash reported: Threads _________________________________ Thread: Unknown Name (Crashed) 0 libobjc.A.dylib 0x00000001973f7bdc objc_msgSend + 28 1…
Umair Suraj
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1 answer

Objective C selector table functions

I am trying to figure out which method objc_msgSend() will call. While looking at assembly of any function in Appkit or Cocoa or Any framework based on Objective-C framework, I always get stucked at objc_msgSend(). Does any one has any idea how to…
RLT
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SDWebImage Throwing 'Too Many Arguments' Error

When I run the app on simulator, it runs perfect. When I try to Archive to upload to AppStore I get error messages on SDWebImageManager that says SDWebImageManager.m:244:22: Too many arguments to function call, expected 0, have 5 I have gone into…
user717452
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1 answer

Debug objc_msgSend crash I cant reproduce

I've had some crash reports from bugsense for my iOS app I'm not able to reproduce and so not to debug. It happens more than 200 times a day so I guess it's quite serious. I've read something about NSZombie but I'm not able to reproduce the crash so…
lorenzop
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