c++怎么将数组写入二进制文件

#include <iostream>
#include <fstream>

int main() {
    int arr[] = {1, 2, 3, 4, 5};
    int size = sizeof(arr) / sizeof(arr[0]);

    // 打开文件以二进制写入模式
    std::ofstream file("array.bin", std::ios::out | std::ios::binary);

    // 检查文件是否成功打开
    if (!file) {
        std::cerr << "无法打开文件" << std::endl;
        return 1;
    }

    // 写入数组大小
    file.write(reinterpret_cast<char*>(&size), sizeof(size));

    // 写入数组内容
    file.write(reinterpret_cast<char*>(arr), sizeof(arr));

    // 关闭文件
    file.close();

    std::cout << "数组已成功写入二进制文件" << std::endl;

    return 0;
}

#include <iostream>
#include <fstream>
#include <vector>
#include <cstdint>
#include <stdexcept>

template<typename T>
void writeArrayToFile(const std::vector<T>& arr, const std::string& filename) {
    std::ofstream file(filename, std::ios::out | std::ios::binary);
    if (!file) {
        throw std::runtime_error("无法打开文件");
    }

    uint32_t size = static_cast<uint32_t>(arr.size());
    file.write(reinterpret_cast<const char*>(&size), sizeof(size));
    if (!file.good()) {
        throw std::runtime_error("写入大小失败");
    }

    file.write(reinterpret_cast<const char*>(arr.data()), arr.size() * sizeof(T));
    if (!file.good()) {
        throw std::runtime_error("写入数组数据失败");
    }

    file.close();
}

int main() {
    try {
        std::vector<int> arr = {1, 2, 3, 4, 5};
        writeArrayToFile(arr, "array.bin");
        std::cout << "数组已成功写入二进制文件" << std::endl;
    } catch (const std::exception& e) {
        std::cerr << "错误: " << e.what() << std::endl;
        return 1;
    }

    return 0;
}