objective-c - EXC_BAD_ACCESS 信号

Question

我有一个方法启动，它连接到IB中的一个按钮，基本上，第一次运行它时，一切正常，但是当我第二次运行它时(我向你保证数据不会发生任何其他变化)之间)，在第一个循环(int i)之后我得到一个 EXC_BAD_ACCESS 。我打开了 NSZombieEnabled，它没有告诉我任何信息，我只是简单地得到一个简单的

Program received signal: “EXC_BAD_ACCESS”. sharedlibrary apply-load-rules all

方法如下:

- (IBAction)start:(id)sender {

    NSLog(@"1");
    NSArray* firstArr = [data objectAtIndex:0];
    NSLog(@"2");
    for (int i=1; i < [data count]; i++) {
        NSLog(@"%@", data);
        NSArray* currArray = [data objectAtIndex:i];
        NSString* fileName = [currArray objectAtIndex:[firstArr indexOfObject:@"UseFile"]];
        NSString* filePath = [NSString stringWithFormat:@"/%@", fileName];
        NSString* saveAs = [currArray objectAtIndex:[firstArr indexOfObject:@"SaveFileAs"]];
        NSLog(@"3");
        for (int j=0; j < [firstArr count]; j++) {
            NSLog(@"4");
            if ([self isIndexIdentifier:j]) {
                NSLog(@"5");
                NSString* searchStr = [firstArr objectAtIndex:j];
                NSString* replaceStr = [currArray objectAtIndex:j];
                NSDictionary* error;
                NSLog(@"6");
                NSString* appleScript = [NSString stringWithFormat:
                                         @"set searchstring to \"%@\"\n"
                                         @"set replacestring to \"%@\"\n"

                                         @"tell application \"QuarkXPress\"\n"
                                         @"activate\n"
                                         @"if (not (exists document \"%@\")) then\n"
                                         @"open POSIX file \"%@\" with Suppress All Warnings\n"
                                         @"end if\n"
                                         @"tell document \"%@\"\n"
                                         @"repeat with tb from 1 to count of text box\n"
                                         @"tell text box tb\n"
                                         @"set (every text where it is searchstring) to replacestring\n"
                                         @"end tell\n"
                                         @"end repeat\n"
                                         @"end tell\n"
                                         @"end tell\n",
                                         searchStr, replaceStr, fileName, filePath, fileName];
                NSLog(@"7");

                NSLog(@"%@", appleScript);

                NSLog(@"8");
                NSAppleScript *script = [[NSAppleScript alloc] initWithSource: appleScript];
                NSLog(@"9");
                [script executeAndReturnError:&error];
                NSLog(@"10");
                [script release];
                NSLog(@"11");
                NSLog(@"%@", error);
            }
        }
    }

}

我用 NSLogged 来查看是否可以找到一些东西，这是该方法第二次被调用时的控制台:

run
2011-04-02 08:55:38.145 TestUI[4472:a0f] 1
2011-04-02 08:55:38.145 TestUI[4472:a0f] 2
2011-04-02 08:55:38.146 TestUI[4472:a0f] (
        (
        UseFile,
        xxxxxxxxxxxxx,
        SaveFileAs
    ),
        (
        "1.qxp",
        11111,
        ""
    ),
        (
        "2.qxp",
        aslkvknv,
        ""
    ),
        (
        "3.qxp",
        ABCDEFG,
        ""
    ),
        (
        "4.qxp",
        222222222,
        ""
    ),
        (
        "5.qxp",
        asdf,
        adsffdsa
    )
)
2011-04-02 08:55:38.146 TestUI[4472:a0f] 3
2011-04-02 08:55:38.147 TestUI[4472:a0f] 4
2011-04-02 08:55:38.147 TestUI[4472:a0f] 4
2011-04-02 08:55:38.147 TestUI[4472:a0f] 5
2011-04-02 08:55:38.147 TestUI[4472:a0f] 6
2011-04-02 08:55:38.148 TestUI[4472:a0f] 7
2011-04-02 08:55:38.148 TestUI[4472:a0f] set searchstring to "xxxxxxxxxxxxx"
set replacestring to "11111"
tell application "QuarkXPress"
activate
if (not (exists document "1.qxp")) then
open POSIX file "/1.qxp" with Suppress All Warnings
end if
tell document "1.qxp"
repeat with tb from 1 to count of text box
tell text box tb
set (every text where it is searchstring) to replacestring
end tell
end repeat
end tell
end tell
2011-04-02 08:55:38.148 TestUI[4472:a0f] 8
2011-04-02 08:55:38.148 TestUI[4472:a0f] 9
2011-04-02 08:55:38.517 TestUI[4472:a0f] 10
2011-04-02 08:55:38.517 TestUI[4472:a0f] 11
Program received signal:  “EXC_BAD_ACCESS”.
sharedlibrary apply-load-rules all
(gdb) 

Answer 1

您的最终 NSLog(错误)很可能是您粘贴的输出中崩溃的内容。 executeAndReturn: 的 errorInfo 参数的文档说:

On return, if an error occurs, a pointer to an error information dictionary.

(强调已添加)。因此，如果没有错误，则无法保证未初始化的 error 变量不是垃圾指针。