c++ - fstream::open() 不起作用 - 从字符串中读取字符时出错

问题描述

我正在使用 vs2012 并且需要将用户输入作为文件名来打开文件。（我使用 using namespace std; 在我的程序开头，所以 cout << 基本上意味着 std::cout）

此代码适用于我的一个项目，但对于其他项目，完全相同的代码给出了错误：0xcccccccc“从字符串读取字符时出错”

//this does not work
#include <iostream>
#include <string>
#include <fstream>
using namespace std;


int main(){

    ifstream routesFile;
    string routesFileName;
        
    cout << "Please enter a filename for route database: ";
    cin >> routesFileName;

    routesFile.open(routesFileName.c_str()); 
    
    if (routesFile.fail())               
        cout << "Cannot open cannot open routes database file" << endl;
    
    cin.ignore();
    cin.get();
    return 0;
}

//this works
using namespace std;
#include <string>
#include <iostream>
#include <fstream> 
#include <sstream>
#include "strutils.h"


ifstream routesCheck(bool &exit)
{
    
    ifstream routesFile;
    string routesFileName;
    bool check = false;
    
    while(check == false)
    {
        
        cout << "Please enter a filename for route database: ";
        cin >> routesFileName;
        
        if(routesFileName == "EXIT")
        {exit = true; break;}

        routesFile.open(routesFileName.c_str()); 
    
        if (routesFile.fail())               
            cout << "Cannot open cannot open routes database file" << endl;
        
        else 
        {check = true; return routesFile;}

    }

}


ifstream timesCheck(bool &exit)
{
    
    ifstream timesFile;
    string timesFileName;
    bool check = false;
    
    while(check == false)
    {
        
        cout << "Please enter a filename for times database: ";
        cin >> timesFileName;

        if(timesFileName == "EXIT")
        {exit = true; break;}
    
        timesFile.open(timesFileName.c_str()); 
    
        if (timesFile.fail())               
            cout << "Cannot open cannot open times database file" << endl;
        
        else 
        {check = true; return timesFile;}

    }

}

double startTime(bool &exit)
{
    bool check = false;
    string startCheck = "", startCheckDummy="", foo=""; // foo is for converting char to string so that string to double converter can work
    double start = 0.0;

    while(check == false)
    {
        startCheck = ""; startCheckDummy=""; foo=""; start = 0.0;
        cout << "Please enter start time of arrival: ";
        cin >> startCheckDummy;

        if(startCheckDummy == "EXIT")
        {exit = true; break;}
        
        if(startCheckDummy.at(2) == ':' && startCheckDummy.at(0) >= 48 && startCheckDummy.at(0) <= 57 &&
           startCheckDummy.at(1) >= 48 && startCheckDummy.at(1) <= 57 && startCheckDummy.at(3) >= 48 && startCheckDummy.at(3) <= 57 && 
           startCheckDummy.at(4) >= 48 && startCheckDummy.at(4) <= 57)
        {
            startCheck += startCheckDummy.at(0);
            startCheck += startCheckDummy.at(1);
            startCheck += startCheckDummy.at(3);
            startCheck += startCheckDummy.at(4);

            foo = startCheck.at(0);
            start += atof(foo)*10;
            foo = startCheck.at(1);
            start += atof(foo);
            foo = startCheck.at(2);
            start += atof(foo)*0.1;
            foo = startCheck.at(3);
            start += atof(foo)*0.01;
            
            if(start >= 00.00 && start <= 23.59)
            {check = true; return start;}
            else
                cout << "Time is not in correct format" << endl;
        }
        else
            cout << "Time is not in correct format" << endl;
        
    }

    
}

void display(ifstream &routesFile, ifstream &timesFile, const double &routeStart, const string &depLoc) //delete const & if program doesnt work
{
    string r, t, depLocCheck, arrivalLoc, startCheckDummy, startCheck, foo;
    int routeID, timeID, startBabe = 0;
    double start = 0.0;
    cout << "The search results are: " << endl;
    
    while (getline(routesFile,r))
    {   
        istringstream routes(r);
         
        routes >> routeID >> depLocCheck >> arrivalLoc;
        
            if(depLocCheck == depLoc)
            {
                while (getline(timesFile,t))
                {
                    istringstream times(t);
                    times >> timeID >> startCheckDummy;
                    
                    startCheck = "";
                
                    startCheck += startCheckDummy.at(0);
                    startCheck += startCheckDummy.at(1);
                    startCheck += startCheckDummy.at(3);
                    startCheck += startCheckDummy.at(4);

                    start = atof(startCheck) / 100.0;
                    startBabe = atoi(startCheck) / 100;

                    if(timeID == routeID && start >= routeStart)
                    {
                        if(startBabe == start)
                        {
                            if(startBabe < 10)
                                {cout << depLoc << " " << arrivalLoc << " " << "0" << start << ".00" << endl;}
                            else
                                {cout << depLoc << " " << arrivalLoc << " " << start << ".00" << endl;}
                        }
                        else if(startBabe < 10)
                        {
                            cout << depLoc << " " << arrivalLoc << " " << "0" << start << endl;
                            if(startCheckDummy.at(4) == '0')
                                {cout << depLoc << " " << arrivalLoc << " " << start << "0" << endl;}
                        }
                        else if(startCheckDummy.at(4) == '0')
                            {cout << depLoc << " " << arrivalLoc << " " << start << "0" << endl;}
                        else
                            {cout << depLoc << " " << arrivalLoc << " " <<  start << endl;}
                    }
                    
                    start = 0.0;
                    
                    startBabe = 0;

                }
                timesFile.clear();
                timesFile.seekg(0);
            }

    }
    routesFile.clear();
    routesFile.seekg(0);
}


int main()
{
    bool exit = false;
    string depLoc;
    double start;
    ifstream routesFile, timesFile;
    
    routesFile = routesCheck(exit);

    timesFile = timesCheck(exit);

    cout << "Please enter departure location: ";
    cin >> depLoc;

    start = startTime(exit);

    while(!exit)
    {
        display(routesFile, timesFile, start, depLoc);
        cout << "Please enter departure location: ";
        cin >> depLoc;

        if(depLoc == "EXIT")
            exit = true;
        else
            start = startTime(exit);
    }

    cin.get();
    cin.ignore();
    return 0;
}

我读到内存泄漏时会发生 0xccccccc 错误。我真的无法理解它如何适用于我的一个项目，但不适用于其他项目。我认为这与我放置输入文件的位置有关，但使用其他方法打开文件适用于其他项目。所以，我认为这与位置无关。它仅适用于一个项目的原因可能是什么？我如何为其他项目修复它？

标签： c++filevisual-studio-2012fstream

c++ - fstream::open() 不起作用 - 从字符串中读取字符时出错

问题描述

解决方案

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