如何正确读取.txt文件并使用指针C++赋值给结构

#include <iostream>
#include <fstream>

struct MyStruct {
    int id;
    std::string name;
    double value;
};

int main() {
    std::ifstream file("example.txt"); // 打开.txt文件
    if (file.is_open()) {
        MyStruct myStruct;
        file >> myStruct.id; // 从文件中读取id
        file >> myStruct.name; // 从文件中读取name
        file >> myStruct.value; // 从文件中读取value

        std::cout << "ID: " << myStruct.id << std::endl;
        std::cout << "Name: " << myStruct.name << std::endl;
        std::cout << "Value: " << myStruct.value << std::endl;

        file.close(); // 关闭文件
    } else {
        std::cout << "Failed to open the file." << std::endl;
    }

    return 0;
}

#include <iostream>
#include <fstream>

struct MyStruct {
    int* ptr;
};

int main() {
    std::ifstream file("example.txt"); // 打开.txt文件
    if (file.is_open()) {
        MyStruct myStruct;
        myStruct.ptr = new int; // 分配内存给指针

        file >> *(myStruct.ptr); // 从文件中读取值并通过指针赋值

        std::cout << "Value: " << *(myStruct.ptr) << std::endl;

        delete myStruct.ptr; // 释放内存

        file.close(); // 关闭文件
    } else {
        std::cout << "Failed to open the file." << std::endl;
    }

    return 0;
}