使用NSOperation时EXEC_BAD_ACCESS

Question

这与我的问题几乎相同,只是代码非常不同:http://www.cocoabuilder.com/archive/message/cocoa/2009/3/24/233015

我想将一些处理卸载到NSOperation,传递一个文件名作为NSOperation加载和解析的引用.应用程序EXEC_BAD_ACCESS在进入时崩溃-(void)init.

以下是我启动操作的方式:

int n = [files count];
for (int i = 0; i < n; i++) {
    NSString *filename = [files objectAtIndex:i];
    FilterParseOperation *parser = [[FilterParseOperation alloc] initWithContentsOfFile:filename];
    [filterParseQueue addOperation:parser];
    [parser release], parser = nil;
}

在剥离了我在NSOperation中的所有内容之后,我仍然以崩溃告终.以下代码崩溃:

#import "FilterParseOperation.h"

@implementation FilterParseOperation

- (id)initWithContentsOfFile:(NSString *)aFilename {
    filename = aFilename;
    return self;
}

- (void)dealloc {
    [filename release], filename = nil;
    [super dealloc];
}

- (void)main {
    // do nothing!
}

@end

这是崩溃的汇编程序输出(我不是很容易理解它的内容).这在__opLock中的addOperation之后直接发生

0x305ce610  <+0000>  push   ebp
0x305ce611  <+0001>  mov    ebp,esp
0x305ce613  <+0003>  push   ebx
0x305ce614  <+0004>  sub    esp,0x14
0x305ce617  <+0007>  call   0x305ce61c <__opLock+12>
0x305ce61c  <+0012>  pop    ebx
0x305ce61d  <+0013>  mov    eax,DWORD PTR [eax+0x4]
0x305ce620  <+0016>  mov    edx,DWORD PTR [eax+0x14] <- Crash happens here
0x305ce623  <+0019>  mov    eax,DWORD PTR [ebx+0xbfe94]
0x305ce629  <+0025>  mov    DWORD PTR [esp+0x4],eax
0x305ce62d  <+0029>  mov    DWORD PTR [esp],edx
0x305ce630  <+0032>  call   0x306af856 <dyld_stub_objc_msgSend>
0x305ce635  <+0037>  add    esp,0x14
0x305ce638  <+0040>  pop    ebx
0x305ce639  <+0041>  leave  
0x305ce63a  <+0042>  ret    
0x305ce63b  <+0043>  nop    DWORD PTR [eax+eax+0x0]

有任何想法吗？:)

Answer 1

你应该打电话[super init];来-initWithContentsOfFile:.NSOperation可能会在那里设置一些工作所需的设置.