获取运行时异常

如何解决获取运行时异常

-(BOOL)createTimer
{
    stRs232Timer*   pEvent = malloc(sizeof(stRs232Timer));

    pEvent->bPersistent = YES;                              // setup timer structure
    pEvent->wAppTimerId = 95;
    pEvent->uPeriod     = 50;
    pEvent->bStopped    = NO;
    pEvent->uExpirationTime = 10;

    NSLog(@\"bPersistent:%d\",pEvent->bPersistent);
    NSLog(@\"wAppTimerId:%d\",pEvent->wAppTimerId);
    NSLog(@\"uPeriod:%d\",pEvent->uPeriod);
    NSLog(@\"bStopped:%d\",pEvent->bStopped);


    NSData* myData = [NSData dataWithBytes:(stRs232Timer*)pEvent length:sizeof(stRs232Timer*)];

    wTimerId = 99;
    pEvent->uPeriod = 51;
    myData = [NSData dataWithBytes:(stRs232Timer*)pEvent length:sizeof(stRs232Timer*)];
         [m_cAppIdMap setobject:myData forKey:[NSNumber numberWithUnsignedShort:wTimerId]];
    wTimerId = 96;
    pEvent->uPeriod = 52;
    myData = [NSData dataWithBytes:(stRs232Timer*)pEvent length:sizeof(stRs232Timer*)];
    [m_cAppIdMap setobject:myData forKey:[NSNumber numberWithUnsignedShort:wTimerId]];
    wTimerId = 97;
    pEvent->uPeriod = 53;
    myData = [NSData dataWithBytes:(stRs232Timer*)pEvent length:sizeof(stRs232Timer*)];
    [m_cAppIdMap setobject:myData forKey:[NSNumber numberWithUnsignedShort:wTimerId]];
    wTimerId = 98;
    pEvent->uPeriod = 54;
    myData = [NSData dataWithBytes:(stRs232Timer*)pEvent length:sizeof(stRs232Timer*)];
    [m_cAppIdMap setobject:myData forKey:[NSNumber numberWithUnsignedShort:wTimerId]];
    wTimerId = 95;
    pEvent->uPeriod = 55;
    myData = [NSData dataWithBytes:(stRs232Timer*)pEvent length:sizeof(stRs232Timer*)];
    [m_cAppIdMap setobject:myData forKey:[NSNumber numberWithUnsignedShort:wTimerId]];

    NSLog(@\"The dictionary count Now is:%d\",[m_cAppIdMap count]);
    NSLog(@\"The dictionary values Now is:\");
    NSLog(@\"%@\",m_cAppIdMap);

    [m_cPendingEventList addobject:myData];
    NSLog(@\"EventList:%@\",m_cPendingEventList);

    [self ChangeTimer:95 withPeriod:10];

    free(pEvent);
    return YES;
}

-(BOOL)ChangeTimer:(unsigned short)wTimerIds withPeriod:(uint8_t)uPeriod
{
 stRs232Timer*   pEvent;
    NSLog(@\"Into the changeTimer\");
    pEvent = (stRs232Timer*)[m_cAppIdMap objectForKey:[NSNumber numberWithUnsignedShort:wTimerIds]];
    NSLog(@\"The val is:%@\",pEvent);
    if(pEvent!=nil){
        pEvent->bStopped = NO;
        pEvent->uPeriod = uPeriod;
        NSLog(@\"completed\");
        }       

    return YES;
}

main.m
----------
int main (int argc,const char * argv[]) {

    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    NSArray1* arr = [[NSArray1 alloc]init];
    [arr createTimer];
    [pool drain];
    return 0;
}

我收到EXC_BAD_ACCESs运行时异常。为什么会这样。我没有访问任何释放的内存。编辑：

2011-05-30 11:21:45.191 NSArray[1091:a0f] bPersistent:1
2011-05-30 11:21:45.194 NSArray[1091:a0f] wAppTimerId:95
2011-05-30 11:21:45.195 NSArray[1091:a0f] uPeriod:50
2011-05-30 11:21:45.195 NSArray[1091:a0f] bStopped:0
2011-05-30 11:21:45.196 NSArray[1091:a0f] *** __NSAutoreleasenopool(): Object 0x100110180 of class NSConcreteData autoreleased with no pool in place - just leaking
2011-05-30 11:21:45.196 NSArray[1091:a0f] *** __NSAutoreleasenopool(): Object 0x1001102f0 of class NSConcreteData autoreleased with no pool in place - just leaking
2011-05-30 11:21:45.197 NSArray[1091:a0f] *** __NSAutoreleasenopool(): Object 0x100110410 of class NSCFNumber autoreleased with no pool in place - just leaking
2011-05-30 11:21:45.197 NSArray[1091:a0f] *** __NSAutoreleasenopool(): Object 0x100110a70 of class NSConcreteData autoreleased with no pool in place - just leaking
2011-05-30 11:21:45.198 NSArray[1091:a0f] *** __NSAutoreleasenopool(): Object 0x100110ab0 of class NSCFNumber autoreleased with no pool in place - just leaking
2011-05-30 11:21:45.198 NSArray[1091:a0f] *** __NSAutoreleasenopool(): Object 0x100110ad0 of class NSConcreteData autoreleased with no pool in place - just leaking
2011-05-30 11:21:45.199 NSArray[1091:a0f] *** __NSAutoreleasenopool(): Object 0x100110b10 of class NSCFNumber autoreleased with no pool in place - just leaking
2011-05-30 11:21:45.199 NSArray[1091:a0f] *** __NSAutoreleasenopool(): Object 0x100110b30 of class NSConcreteData autoreleased with no pool in place - just leaking
2011-05-30 11:21:45.200 NSArray[1091:a0f] *** __NSAutoreleasenopool(): Object 0x100110b70 of class NSCFNumber autoreleased with no pool in place - just leaking
2011-05-30 11:21:45.201 NSArray[1091:a0f] *** __NSAutoreleasenopool(): Object 0x1001109e0 of class NSConcreteData autoreleased with no pool in place - just leaking
2011-05-30 11:21:45.201 NSArray[1091:a0f] *** __NSAutoreleasenopool(): Object 0x1001105d0 of class NSCFNumber autoreleased with no pool in place - just leaking
2011-05-30 11:21:45.202 NSArray[1091:a0f] The dictionary count Now is:5
2011-05-30 11:21:45.202 NSArray[1091:a0f] The dictionary values Now is:
2011-05-30 11:21:45.203 NSArray[1091:a0f] {
    98 = <5f000136 000a0000>;
    97 = <5f000135 000a0000>;
    96 = <5f000134 000a0000>;
    99 = <5f000133 000a0000>;
    95 = <5f000137 000a0000>;
}
2011-05-30 11:21:45.203 NSArray[1091:a0f] EventList:(
    <5f000137 000a0000>
)
2011-05-30 11:21:45.204 NSArray[1091:a0f] Into the changeTimer
2011-05-30 11:21:45.204 NSArray[1091:a0f] *** __NSAutoreleasenopool(): Object 0x100111130 of class NSCFNumber autoreleased with no pool in place - just leaking
2011-05-30 11:21:45.205 NSArray[1091:a0f] The val is:<5f000137 000a0000>
2011-05-30 11:21:45.205 NSArray[1091:a0f] completed

这是删除NSAutoreleasePool和[poolrain]时得到的输出。如果我没有同时删除这两个消息，我将得到EXC_BAD_ACCESS作为运行时异常。调试时，我遇到了[池排水]异常（EXC_BAD_ACCESS）；声明。我不知道为什么会这样。

解决方法

看这行（和类似的）：

NSData* myData = [NSData dataWithBytes:(stRs232Timer*)pEvent length:sizeof(stRs232Timer*)];

字节数等于指向stRs232Timer数据的指针的大小，例如对于32位系统，该指针的大小为4个字节，对于64位系统为8个字节，但不是stRs232Timer结构的大小。因此，您复制的字节不足。强制转换也不是必需的，因此应如下所示：

NSData* myData = [NSData dataWithBytes: pEvent length: sizeof(stRs232Timer)];

顺便说一句，这个第一个实例在保存到字典中之前将被覆盖。后来在ChangeTimer中，应使用NSData bytes方法，而不是直接转换为stRs232Timer：

pEvent = (stRs232Timer*)[[m_cAppIdMap objectForKey:[NSNumber numberWithUnsignedShort:wTimerIds]] bytes];

这将为您提供指向数据的指针，将NSData直接转换为stRs232Timer是错误的。

如何解决获取运行时异常

解决方法

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