使用 getline(） 从文件中读取行时出现问题

我设置了readFile（）方法，以便我的"myList"向量保持更新，但是当我运行程序时，尽管我的addItem（）方法正确地写入文件，但我的向量是空的。

我尝试四处寻找有关 ifstream 和 getline 的问题，但大多数解决方案都相当于提前知道每行读取的项目数的解决方法。

如果有人能告诉我我做错了什么，我将不胜感激。

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <vector>
using namespace std;
void readFile(vector<string> myList);
void writeToFile(vector<string> myList);
void mainMenu();
void displayList(vector<string> myList);
void addItem(vector<string> myList);
void removeItem(vector<string> myList);
string fileName = "C:\Users\Owner\Documents.todo_list.txt";
int main()
{
    vector<string> myList;
    int choice;
    do
    {
        readFile(myList);
        mainMenu();
        cin >> choice;
        cout << endl;
        switch(choice)
        {
            case 1:
            {
                displayList(myList);
                break;
            }
            case 2:
            {
                addItem(myList);
                break;
            }
            case 3:
            {
                removeItem(myList);
                break;
            }
            default:
            {
            }
        }
        cout << endl;
    } while (choice != 0);
    return 0;
}
void readFile(vector<string> myList)
{
    ifstream read(fileName.c_str(), ios::in);
    if(!read)
    {
        cout << "Could not open file." << endl;
        exit(1);
    }
    if (myList.size() > 0)
    {
        myList.clear();
    }
    else
    {
        string item;
        getline(read,item);
        myList.push_back(item);
    }
    read.close();
}
void writeToFile(vector<string> myList)
{
    ofstream rewrite(fileName.c_str(), ios::out);
    for (int i = 0; i < myList.size(); ++i)
    {
        rewrite << myList[i] << endl;
    }
    rewrite.close();
}
void mainMenu()
{
    cout << " ========== Main Menu ==========" << endl;
    cout << " 1. Display To-do List" << endl;
    cout << " 2. Add item to the To-do List" << endl;
    cout << " 3. Remove item from the To-do List" << endl;
    cout << "n 0. Exit program" << endl;
    cout << ": ";
}
void displayList(vector<string> myList)
{
    cout << " ========== To-do List =========" << endl;
    if (myList.empty())
    {
        cout << "      ----- empty list -----" << endl;
    }
    else
    {
        for (int i = 0; i < myList.size(); ++i)
        {
            cout << " " << (i + 1) << ". " << myList[i] << endl;
        }
    }
}
void addItem(vector<string> myList)
{
    ofstream write(fileName.c_str(), ios::app);
    string item;
    cout << "Please enter an item to add to the list: ";
    cin.ignore();
    getline(cin, item);
    write << item << endl;
    write.close();
}
void removeItem(vector<string> myList)
{
    int item;
    displayList(myList);
    cout << "nPlease select an item to delete: ";
    cin >> item;
    cout << endl;
    cout << "...removing "" << myList[item - 1] << """ << endl;
    myList.erase(myList.begin() + (item - 1));
    writeToFile(myList);
}