NSNumber numberWithInt崩溃数字> = 13 [英] NSNumber numberWithInt crashing on numbers >= 13

问题描述

我对Objective-C很新。我已经阅读了类似的问题，但我无法想象如何解决我的问题与这些信息。

基本上，我这样做：

  NSMutableArray * array1 = [[NSMutableArray alloc] initWithCapacity：1]; 
 NSNumber * n1 = [NSNumber numberWithInt：12]; 
 [array1 addObject：n1]; 
 NSMutableArray * array2 = [[NSMutableArray alloc] initWithCapacity：1]; 
 NSNumber * n2 = [NSNumber numberWithInt：13]; 
 [array2 addObject：n2]; 
  

将NSNumber 12添加到数组可以完美的工作，但添加13（或更高）不会;程序在运行时崩溃（没有错误消息，并且生成的stackdump文件完全为空）。我正在Cygwin用gcc编译，如果重要。
我明白这可能与保留计数有关，就像上面提到的问题，但是我不知道如何解决它。即使我注释掉最后一行，它崩溃了...所以它在numberWithInt调用中崩溃，这意味着如果我为n2添加了一个保留语句，那么它将不会有机会被调用。

编辑：由于我被要求提供更多的代码，以下是为了测试这个问题而制作的文件：

  #import< stdio.h> 
 #import< Foundation / NSArray.h> 
 #import< Foundation / NSValue.h> 
 
 int main（int argc，const char * argv []）
 {
 printf（1.\\\
）; 
 NSMutableArray * array1 = [[NSMutableArray alloc] initWithCapacity：1]; 
 NSNumber * n1 = [NSNumber numberWithInt：12]; 
 [array1 addObject：n1]; 
 NSMutableArray * array2 = [[NSMutableArray alloc] initWithCapacity：1]; 
 NSNumber * n2 = [NSNumber numberWithInt：13]; 
 [array2 addObject：n2]; 
 printf（2.\\\
）; 
 
 return 0; 
} 
  

打印1.然后崩溃，如上所述。这是我的makefile：

  CYGWIN_GNUSTEP_PATH = / cygdrive / c / GNUstep 
 CXX = gcc 
 MAIN = DummyGame 
 SOURCES = DummyGame.m 
 OBJECTS = $（SOURCES：％。m =％。o）
 COMP_FLAGS = -std = c99 -I $（CYGWIN_GNUSTEP_PATH）/ GNUstep / System / Library / Headers -L $（CYGWIN_GNUSTEP_PATH）/ GNUstep / System / Library / Libraries -fconstant-string-class = NSConstantString 
 LINK_FLAGS = $（COMP_FLAGS）-lobjc -lgnustep-base 
 
 all： $（MAIN）
 
 $（主）：$（OBJECTS）
 $（CXX）-o $ @ $ ^ $（LINK_FLAGS）
 
％ ：％.m $（HEADERS）
 $（CXX）-c $< $（COMP_FLAGS）
 
清洁：
 $（RM）$（MAIN）$（OBJECTS）
  

解决方案

尝试围绕你的代码（你已经放在主），用一行来创建一个自动释放池，然后消耗一个自动释放池：

  NSAutoReleasePool * pool = [[NSAutoReleasePool alloc] init]; 
 NSMutableArray * array1 = [[NSMutableArray alloc] initWithCapacity：1]; 
 NSNumber * n1 = [NSNumber numberWithInt：12]; 
 [array1 addObject：n1]; 
 NSMutableArray * array2 = [[NSMutableArray alloc] initWithCapacity：1]; 
 NSNumber * n2 = [NSNumber numberWithInt：13]; 
 [array2 addObject：n2]; 
 [pool drain]; 
  

I'm pretty new to Objective-C. I've read through a similar question but I can't figure out how to solve my problem with that information.

Basically, I'm doing this:

NSMutableArray* array1 = [[NSMutableArray alloc] initWithCapacity: 1];
NSNumber *n1 = [NSNumber numberWithInt: 12];
[array1 addObject: n1];
NSMutableArray* array2 = [[NSMutableArray alloc] initWithCapacity: 1];
NSNumber *n2 = [NSNumber numberWithInt: 13];
[array2 addObject: n2];

Adding the NSNumber 12 to the array works perfectly fine, but adding 13 (or anything higher) does not; the program crashes at runtime (no error messages, and the stackdump file produced is completely blank). I'm compiling with gcc in Cygwin, if that matters. I understand that this is probably related to retain counts, as in the question I mentioned above, but I don't know how to fix it. Even if I comment out the last line, it crashes... so it's crashing right at the numberWithInt call, meaning that if I add a retain statement for n2, it won't have a chance to get called anyway.

edit: Since I was asked for more code, here's the file I made in order to test this problem:

#import <stdio.h>
#import <Foundation/NSArray.h>
#import <Foundation/NSValue.h>

int main( int argc, const char *argv[] )
{
    printf("1.\n");
    NSMutableArray* array1 = [[NSMutableArray alloc] initWithCapacity: 1];
    NSNumber *n1 = [NSNumber numberWithInt: 12];
    [array1 addObject: n1];
    NSMutableArray* array2 = [[NSMutableArray alloc] initWithCapacity: 1];
    NSNumber *n2 = [NSNumber numberWithInt: 13];
    [array2 addObject: n2];
    printf("2.\n");

    return 0;
}

This prints "1." and then crashes, as above. Here is my makefile:

CYGWIN_GNUSTEP_PATH=/cygdrive/c/GNUstep
CXX = gcc
MAIN = DummyGame
SOURCES = DummyGame.m
OBJECTS = $(SOURCES:%.m=%.o)
COMP_FLAGS = -std=c99 -I $(CYGWIN_GNUSTEP_PATH)/GNUstep/System/Library/Headers -L $(CYGWIN_GNUSTEP_PATH)/GNUstep/System/Library/Libraries -fconstant-string-class=NSConstantString
LINK_FLAGS = $(COMP_FLAGS) -lobjc -lgnustep-base

all: $(MAIN)

$(MAIN): $(OBJECTS)
    $(CXX) -o $@ $^ $(LINK_FLAGS)

%.o: %.m $(HEADERS)
    $(CXX) -c $< $(COMP_FLAGS)

clean:
$(RM) $(MAIN) $(OBJECTS)

解决方案

Try surrounding your code (which you've placed in main) with a line to create and then drain an auto release pool:

NSAutoReleasePool *pool = [[NSAutoReleasePool alloc] init];
NSMutableArray* array1 = [[NSMutableArray alloc] initWithCapacity: 1];
NSNumber *n1 = [NSNumber numberWithInt: 12];
[array1 addObject: n1];
NSMutableArray* array2 = [[NSMutableArray alloc] initWithCapacity: 1];
NSNumber *n2 = [NSNumber numberWithInt: 13];
[array2 addObject: n2];
[pool drain];

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