WinHttpGetProxyForUrl获取数据一直为空的问题

Question

#ifndef UNICODE
#define UNICODE
#endif

#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0A00
#endif

#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif

#include <windows.h>
#include <winhttp.h>
#include <string>
#include <iostream>

#pragma comment(lib, "winhttp.lib")

int wmain(int argc, wchar_t* argv[]) {
	if (argc != 2) {
		std::wcerr << L"Parameters: <Domain>" << std::endl;
		return 1;
	}

	// 获取系统的代理设置
	WINHTTP_CURRENT_USER_IE_PROXY_CONFIG ProxyConfig;
	ZeroMemory(&ProxyConfig, sizeof(ProxyConfig));
	if (!WinHttpGetIEProxyConfigForCurrentUser(&ProxyConfig)) {
		std::wcerr << L"WinHttpGetIEProxyConfigForCurrentUser failed, error: "
			<< GetLastError() << std::endl;
		return 1;
	}

	if (ProxyConfig.lpszProxy != NULL) {
		// 检查bypass列表
		if (ProxyConfig.lpszProxyBypass != NULL) {
			wchar_t* domain = wcstok(ProxyConfig.lpszProxyBypass, L";");

			while (domain != NULL) {
				if (wcscmp(domain, argv[1]) == 0) {
					std::wcout << L"Proxy Bypass" << std::endl;
					GlobalFree(ProxyConfig.lpszProxy);
					GlobalFree(ProxyConfig.lpszProxyBypass);
					return 0;
				}

				domain = wcstok(NULL, L";");
			}

			GlobalFree(ProxyConfig.lpszProxyBypass);
		}

		std::wcout << L"Proxy: " << ProxyConfig.lpszProxy << std::endl;
		GlobalFree(ProxyConfig.lpszProxy);
		return 0;
	}

	// 设置自动代理选项
	WINHTTP_AUTOPROXY_OPTIONS AutoProxyOptions;
	ZeroMemory(&AutoProxyOptions, sizeof(AutoProxyOptions));
	if (ProxyConfig.fAutoDetect) {
		AutoProxyOptions.dwFlags = WINHTTP_AUTOPROXY_AUTO_DETECT;
		AutoProxyOptions.dwAutoDetectFlags =
			WINHTTP_AUTO_DETECT_TYPE_DHCP | WINHTTP_AUTO_DETECT_TYPE_DNS_A;
	}
	if (ProxyConfig.lpszAutoConfigUrl != NULL) {
		AutoProxyOptions.dwFlags |= WINHTTP_AUTOPROXY_CONFIG_URL;
		AutoProxyOptions.lpszAutoConfigUrl = ProxyConfig.lpszAutoConfigUrl;

	}
	if (AutoProxyOptions.dwFlags == NULL) {
		std::wcout << L"No Proxy" << std::endl;
		return 0;
	}
	AutoProxyOptions.fAutoLogonIfChallenged = TRUE;

	// 创建一个WinHTTP会话
	HINTERNET hSession = WinHttpOpen(
		L"Windows",
		WINHTTP_ACCESS_TYPE_NO_PROXY,
		WINHTTP_NO_PROXY_NAME,
		WINHTTP_NO_PROXY_BYPASS,
		0
	);
	if (hSession == NULL) {
		std::wcerr << L"WinHttpOpen failed, error: "
			<< GetLastError() << std::endl;
		return 1;
	}

	// 获取代理信息
	std::wstring wurl = L"http://" + (std::wstring)argv[1] + L"/";
	WINHTTP_PROXY_INFO ProxyInfo;
	ZeroMemory(&ProxyInfo, sizeof(ProxyInfo));
	if (!WinHttpGetProxyForUrl(
		hSession,
		wurl.c_str(),
		&AutoProxyOptions,
		&ProxyInfo
	)) {
		std::wcerr << L"WinHttpGetProxyForUrl failed, error: "
			<< GetLastError() << std::endl;
		WinHttpCloseHandle(hSession);
		return 1;
	}

	// 如果成功，ProxyInfo.lpszProxy就包含了代理服务器的地址
	if (ProxyInfo.lpszProxy != NULL) {
		std::wcout << L"Proxy: " << ProxyInfo.lpszProxy << std::endl;
		GlobalFree(ProxyInfo.lpszProxy);
	} else {
		std::wcout << L"Proxy: NULL" << std::endl;
	}

	// 清理
	if (ProxyConfig.lpszAutoConfigUrl != NULL) {
		GlobalFree(ProxyConfig.lpszAutoConfigUrl);
	}

	WinHttpCloseHandle(hSession);

	return 0;
}

你好，我有以上代码，但是不知何故，在WinHttpGetProxyForUrl执行成功的情况下，ProxyInfo.lpszProxy变量得到的值总是为空（NULL），请求帮助。

以下是我的PAC文件：

var pHost = "Proxy.local";
var pPort = "1080";
var Socks5 = "SOCKS5 " + pHost + ":" + pPort + "; ";
var Socks = "SOCKS " + pHost + ":" + pPort + "; ";
var Direct = "DIRECT; ";

function FindProxyForURL(url, host) {
        if (shExpMatch(dnsResolveEx(host), "*.*.*.*")) {
                return Socks5 + Socks + Direct;
        } else {
                return Direct;
        }
}

Answer 1

https://stackoverflow.com/questions/78181022/the-data-obtained-by-winhttpgetproxyforurl-is-always-null