-(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;
}
我得到了EXC_BAD_ACCESs运行时异常。为什么会这样。我没有访问任何已释放的内存。
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
这是我在删除NSAutoreleasePool和[pool drain]时得到的输出。
如果我没有删除这两个，我将EXC_BAD_ACCESS作为运行时异常。当我调试时，我遇到异常（EXC_BAD_ACCESS）来到[pool drain];言。
我无法找出发生这种情况的原因。
答案 0 :(得分：2)
看看这一行（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，对于32位系统，例如，对于64位系统8字节，这将是4字节 - 但不是stRs232Timer结构的大小。所以你没有复制足够的字节。
演员阵容也没有必要，所以它应该是这样的：
NSData* myData = [NSData dataWithBytes: pEvent length: sizeof(stRs232Timer)];
BTW这个第一个实例在被保存到字典之前会被覆盖。
<强> LATER
在ChangeTimer中，您应该使用NSData bytes方法，而不是直接投放到stRs232Timer：
pEvent = (stRs232Timer*)[[m_cAppIdMap objectForKey:[NSNumber numberWithUnsignedShort:wTimerIds]] bytes];
这将为您提供指向数据的指针，直接将NSData转换为stRs232Timer是错误的。