从 .txt 文件读入包含 enum 的结构数组 [英] Reading in from a .txt file to a struct array that contains enum

问题描述

这是我的代码

enum Status {IN, OUT };

const int TITLE_SIZE = 50, ISBN_SIZE = 13, AUTHOR_SIZE = 25;

struct Info
{
    char title[TITLE_SIZE];
    char isbn[ISBN_SIZE];
    char author[AUTHOR_SIZE];
    Status inOrOut;
};

int main()
{
    fstream dataFile;
    string filename;
    int numOfBooks = 0;
    Info *test = 0;
    int enumHolder = 0;

    cout << "How many books does the file contain? ";
    cin >> numOfBooks;
    test = new Info[numOfBooks];

    cout << "Enter a file (with path) for input and output: ";
    cin >> filename;

    dataFile.open(filename.c_str(), ios::in );
    if (dataFile.fail())
    {
        cout << "Could not open file; closing program" << "\n";
        return 0;
    }

    for (int i=0; i < (numOfBooks-1); i++)
    {
        dataFile >> test[i].title;
        dataFile >> test[i].isbn;
        dataFile >> test[i].author;
        dataFile >> enumHolder;
        test[i].inOrOut = static_cast<Status>(enumHolder);
    }

   for (int j=0; j < (numOfBooks-1); j++)
    {
        cout << test[j].title << " ";
        cout << test[j].isbn << " ";
        cout << test[j].author << " ";
        cout << test[j].inOrOut << " ";
        cout << "\n";
    }

这是 .txt 文件

书

012345678901

012345678901

盖伊·杜德

1那篇文章

210987654321

210987654321

先生教授博士

0

这是输出

该文件包含多少本书?2

How many books does the file contain? 2

输入一个文件(带路径)用于输入和输出:D:/Documents/input.txt

Enter a file (with path) for input and output: D:/Documents/input.txt

本书 012345678901 0

The Book 012345678901 0

问题

dataFile 在第一个 test[i].author 中停止读取什么?使用 static_cast 会导致这种情况吗?

What does the dataFile stop reading in a the first test[i].author? Is using static_cast causing this?

推荐答案

为了将 enum 转换为可打印的文本并将文本转换为 enum，您需要使用查找表或关联数组.您可以使用 switch 语句，但这并不容易维护.

In order to convert an enum to printable text and text to an enum, you need to use a lookup table or an associative array. You could use a switch statement, but that is not as easy to maintain.

另见:std::map.在 Stackoverflow 中搜索c++ 查找表".

See also: std::map. Search Stackoverflow for "c++ lookup table".

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