读取std :: string的注册表键值的最简单方法是什么？

#include<iostream>
#include<string>
#include<Windows.h>

std::string ReadRegistryKey(HKEY hKey, const std::string& subKey, const std::string& valueName) {
    DWORD dataType;
    DWORD dataSize;
    std::string result;

    // 获取值的大小
    LONG queryResult = RegGetValueA(hKey, subKey.c_str(), valueName.c_str(), RRF_RT_REG_SZ, &dataType, NULL, &dataSize);
    if (queryResult != ERROR_SUCCESS) {
        std::cerr << "Error querying registry value size: "<< queryResult<< std::endl;
        return "";
    }

    // 分配足够的空间以存储值
    char* buffer = new char[dataSize];

    // 读取值
    queryResult = RegGetValueA(hKey, subKey.c_str(), valueName.c_str(), RRF_RT_REG_SZ, &dataType, buffer, &dataSize);
    if (queryResult != ERROR_SUCCESS) {
        std::cerr << "Error reading registry value: "<< queryResult<< std::endl;
        delete[] buffer;
        return "";
    }

    // 将缓冲区中的字符串复制到结果字符串中
    result.assign(buffer);

    // 释放缓冲区
    delete[] buffer;

    return result;
}

int main() {
    std::string keyPath = "SOFTWARE\\Microsoft\\Windows\\CurrentVersion";
    std::string valueName = "CommonFilesDir";

    HKEY hKey = HKEY_LOCAL_MACHINE;
    std::string value = ReadRegistryKey(hKey, keyPath, valueName);

    std::cout << "Value: "<< value<< std::endl;

    return 0;
}