c++ - 在抛出 'std::invalid_argument' what() : stoi 实例后终止调用

Question

stoi 函数使程序崩溃并显示错误消息

"****@****:~> g++ -std=c++0x m1.cpp stimulation.h stims.h Task.h exoskeleton.h ARAIG_Sensors.h Profile.h

ARAIG_Sensors.h:1:9: warning: #pragma once in main file [enabled by default]

Profile.h:1:9: warning: #pragma once in main file [enabled by default]

*****@****:~> a.out StimulationConfig.csv TaskConfiguration.csv SampleProfileConfig.csv SampleOutput.txt

First : a.out
Second : StimulationConfig.csv
terminate called after throwing an instance of 'std::invalid_argument'
  what():  stoi
Aborted

我不明白为什么，有一个实例被传递到函数中，但仍然返回错误。有人可以帮我解决问题吗？

#pragma once
#include <string>
#include <vector>
#include "Task.h"
#include <ostream>
#include "ARAIG_Sensors.h"
namespace m1
{
    class Profile
    {
        ARAIG_Sensors araig;
        std::vector<Task> ToRun;
        std::vector<Task> Completed;
        std::string studentFN;
        std::string studentLN;
        std::string studentSN;
        std::string flightFN;
        std::string flightLN;
        std::string flightEN;
        std::ostream& os;

        struct calibration {
            int Max;
            int Min;
        };

        calibration cal;

    public:
        Profile(std::string fn, std::ostream& o, ARAIG_Sensors& a) : os(o)
        {
            araig = a;

            //parsing student
            std::ifstream infile(fn);
            std::string line;
            std::getline(infile, line);
            int f = line.find_first_of(",");
            studentFN = line.substr(0, f);
            line = line.substr(f + 1);
            f = line.find_first_of(",");
            studentLN = line.substr(0, f);
            studentSN = line.substr(f + 1);

            //parsing flight
            std::getline(infile, line);
            f = line.find_first_of(",");
            flightFN = line.substr(0, f);
            line = line.substr(f + 1);
            f = line.find_first_of(",");
            flightLN = line.substr(0, f);
            flightEN = line.substr(f + 1);

            //parsing calibration
            std::getline(infile, line);
            f = line.find_first_of(",");
            cal.Min = stoi(line.substr(0, f));
            std::cout << cal.Min << std::endl;
            line = line.substr(f + 1);
            cal.Max = stoi(line);



            std::list<Task> temp = araig.gettasks();
            while (std::getline(infile, line))
            {
                for (std::list<Task>::iterator i = temp.begin(); i != temp.end(); i++)
                {
                    if ((*i).getName() == line)
                    {
                        ToRun.push_back(*i);
                        break;
                    }



                }

            }

        }
        void displayToRun()
        {
            for (std::vector<Task>::iterator i = ToRun.begin(); i != ToRun.end(); i++)
            {
                (*i).execute(os);
            }
        }
        void displayCompleted()
        {
            for (std::vector<Task>::iterator i = Completed.begin(); i != Completed.end(); i++)
            {
                (*i).execute(os);
            }
        }
        void displayNext()
        {
            std::vector<Task>::iterator i = ToRun.begin();
            (*i).execute(os);
        }
        void displayLast()
        {
            std::vector<Task>::iterator i = Completed.end();
            (*i).execute(os);
        }
        void Run()
        {
            //excute next Task and move Task to Completed
            std::vector<Task>::iterator i = ToRun.begin();
            Task t = *i;
            t.execute(os);
            ToRun.erase(i);
            Completed.push_back(t);
        }
    };

}

Answer 1

这意味着你正在给 std::stoi() 错误的输入，所以它会抛出一个 std::invalid_argument你没有捕捉到的异常。

std::stoi, std::stol, std::stoll :

Exceptions

• std::invalid_argument if no conversion could be performed

• std::out_of_range if the converted value would fall out of the range of the result type or if the underlying function (std::strtol or std::strtoll) sets errno to ERANGE.

std::terminate

std::terminate() is called by the C++ runtime when exception handling fails for any of the following reasons:

1) an exception is thrown and not caught (it is implementation-defined whether any stack unwinding is done in this case)

您需要仔细检查您尝试转换为整数的输入字符串值。它们不代表整数。