Ifstream 代码没有将输入放入变量中

Question

这是我的代码：

#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
using namespace std;

int main()
{

    //variable init
    ifstream inFile;
    ofstream outFile;
    string toPrint, fileName;
    string var;
    cout << "Enter your save file: "; cin >> fileName;//asks the file name
    cout << "Searching..."<<endl;

    string fileLocation = "C:\\Users\\CraftedGaming\\Documents\\" + fileName + ".txt";//locates it
    inFile.open(fileLocation.c_str());
    if(!inFile){//checks if the file is existent
        cerr << "Error can't find file." << endl;
        outFile.open(fileLocation.c_str());
        outFile << "Player House: Kubo"<<endl;
        outFile.close();
    }
    cout << "Loaded." << endl;

    inFile.ignore(1000, ':'); inFile >> var; //gets the string and places it in variable named var
    cout << var<<endl;

    //replaces var
    cout << "Enter a string: ";
    cin >> var;

    //saving
    outFile.open(fileLocation.c_str());
    outFile << "Player House: " << var;
    inFile.close();
    outFile.close();
}

这里的问题是我无法将玩家的房子命名为“Kubo”并将其放在名为“var”的变量中。它设法在我的文档中创建文件并设法更改 replaces var 部分中的变量。

Answer 1

据我了解，您需要同时读取和写入文件。试试这段代码

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main() {
    string fileName;
    cout << "Enter your save file: ";
    cin >> fileName;
    string filePath = "C:\\Users\\CraftedGaming\\Documents\\" + fileName + ".txt";
    fstream file(filePath, fstream::in | fstream::out | fstream::trunc);   // open modes to read and write simultaneously
    string var;
    if (file.tellg() == 0)
        file << "Player House: Kubo\n";
    file.seekg(14);
    file >> var;
    cout << var << endl;
    file.close();
    return 0;
}

我用tellg()判断文件是否为空，你也可以用

file.peek() == ifstream::traits_type::eof();