[访问 我以前可以访问的功能时出现段错误

Posted 2023-01-07

我正在尝试使用一个函数来检查条件，但是尽管起初我可以访问它，但是经过几次迭代后，我遇到了分段错误。我包括一些WriteLogs来查看函数的返回值。

这是我能够使用该功能的四次之一：

[Fri Jan 10 12:40:25:889]: [INFO][RouteInfoManager::UpdateRouteStatus] Driving Mode 2 passengers 0
[Fri Jan 10 12:40:25:889]: [INFO][RouteInfoManager::UpdateRouteStatus] IsAsva 1
[Fri Jan 10 12:40:26:060]: [INFO][DatasetParam::Int] DatasetParam_TypeException, setting speaker_gain
[Fri Jan 10 12:40:26:063]: [INFO][DatasetParam::Int] DatasetParam_TypeException, setting speaker_gain
[Fri Jan 10 12:40:26:175]: [INFO][DatasetParam::Str] DatasetParam_TypeException, setting cpu_version

并且，这是分段错误错误：

[Fri Jan 10 12:40:26:901]: [INFO][RouteInfoManager::UpdateRouteStatus] Driving Mode 2 passengers 0
[Thread 0xaa3ebb40 (LWP 27594) exited]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xa0f49b40 (LWP 27661)]
0x086d0273 in AlstomMP14::RouteInfoManager::UpdateRouteStatus (this=0x90889e8) at ../src/route/RouteInfoManager.cpp:283
283     WriteLog("[RouteInfoManager::UpdateRouteStatus] IsAsva %d", audioInfoProvider->IsAsvaAuthorisedInTrainCA());

这些是WriteLogs：

WriteLog("[RouteInfoManager::UpdateRouteStatus] Driving Mode %d passengers %d", trainDataProvider->GetDrivingMode(), trainDataProvider->GetDrivingMode() != DRIVING_MODE_AUTOMATIC
         || trainDataProvider->IsTrainWithoutPassengers());

WriteLog("[RouteInfoManager::UpdateRouteStatus] IsAsva %d", audioInfoProvider->IsAsvaAuthorisedInTrainCA());

以及这些涉及的功能：

bool AudioManager::IsAsvaAuthorisedInTrainCA() 
    /// 1) Return true if train CA is without passengers and driving mode is automatic.
    return (!IsTrainCAWithoutPassengers() && trainDataProvider->GetDrivingMode() == DRIVING_MODE_AUTOMATIC);


bool AudioManager::IsTrainCAWithoutPassengers() 
    /// 1) Return true if driving mode is not automatic and train is without passengers.
    return (trainDataProvider->GetDrivingMode() != DRIVING_MODE_AUTOMATIC
            || trainDataProvider->IsTrainWithoutPassengers());

您可以看到WriteLogs显示IsTrainCAWithoutPassengers（）函数的返回，这是IsAsvaAuthorisedInTrainCA（）函数的条件之一。

我不明白为什么，每次（2和0）的取值都相同，有时我可以访问IsAsvaAuthorisedInTrainCA（），有时我会遇到分段错误。

答案

WriteLog("[RouteInfoManager::UpdateRouteStatus] IsAsva %d", audioInfoProvider->IsAsvaAuthorisedInTrainCA());

假设WriteLog的工作方式类似于printf（或转发到printf，则格式说明符与参数不匹配。

[%d代表int，而不是bool。

您的程序有未定义的行为。

粘贴到int。