Windows C++ 获取系统代理设置

#include <iostream>
#include <vector>
#include <tuple>
#include <Windows.h>

int main(int argc, char**argv)
{
    HKEY key;
    auto ret = RegOpenKeyEx(HKEY_CURRENT_USER, R"(Software\Microsoft\Windows\CurrentVersion\Internet Settings)", 0, KEY_ALL_ACCESS, &key);
    if(ret != ERROR_SUCCESS){
        std::cout << "open failed: " << ret << std::endl;
        return -1;
    }

    DWORD values_count, max_value_name_len, max_value_len;
    ret = RegQueryInfoKey(key, NULL, NULL, NULL, NULL, NULL, NULL,
        &values_count, &max_value_name_len, &max_value_len, NULL, NULL);
    if(ret != ERROR_SUCCESS){
        std::cout << "query failed" << std::endl;
        return -1;
    }

    std::vector<std::tuple<std::shared_ptr<char>, DWORD, std::shared_ptr<BYTE>>> values;
    for(int i = 0; i < values_count; i++){
		std::shared_ptr<char> value_name(new char[max_value_name_len + 1],
			std::default_delete<char[]>());
        DWORD value_name_len = max_value_name_len + 1;
        DWORD value_type, value_len;
        RegEnumValue(key, i, value_name.get(), &value_name_len, NULL, &value_type, NULL, &value_len);
        std::shared_ptr<BYTE> value(new BYTE[value_len],
			std::default_delete<BYTE[]>());
        value_name_len = max_value_name_len + 1;
        RegEnumValue(key, i, value_name.get(), &value_name_len, NULL, &value_type, value.get(), &value_len);
        values.push_back(std::make_tuple(value_name, value_type, value));
    }

	DWORD ProxyEnable = 0;
	for (auto x : values) {
		if (strcmp(std::get<0>(x).get(), "ProxyEnable") == 0) {
			ProxyEnable = *(DWORD*)(std::get<2>(x).get());
		}
	}

	if (ProxyEnable) {
		for (auto x : values) {
			if (strcmp(std::get<0>(x).get(), "ProxyServer") == 0) {
				std::cout << "ProxyServer: " << (char*)(std::get<2>(x).get()) << std::endl;
			}
		}
	}
	else {
		std::cout << "Proxy not Enabled" << std::endl;
	}

    return 0;
}