我如何找出浏览器的代理设置？ [英] How do I find out the browser's proxy settings?

问题描述

我写一个Windows的命令行工具，它使用的libcurl从互联网上下载文件。

I am writing a command-line tool for Windows that uses libcurl to download files from the internet.

显然，下载不当用户代理服务器后面，因为代理需要配置工作。我想保持我的工具尽可能简单不过了，没有包袱用户具有配置代理。我的工具甚至没有一个配置文件，因此用户，否则必须在代理设置，通过在每个命令，或者设置环境变量或诸如此类 - 太多的麻烦。

Obviously, the downloading doesn't work when the user is behind a proxy server, because the proxy needs to be configured. I want to keep my tool as simple as possible however, and not have to burden the user with having to configure the proxy. My tool doesn't even have a config file, so the user would otherwise have to pass in the proxy settings on every command, or set an environment variable or somesuch -- way too much hassle.

所以，我想，每个人的浏览器通常已正确设置，配置和一切代理。这将是如此连最基本的用户，否则他们的互联网是行不通的。

So I thought, everyone's browser will usually already be set up properly, proxy configured and everything. This will be true for even the most basic user because otherwise "their internet wouldn't work".

所以我想，我可以找出是否通过查看IE的代理设置使用代理服务器。

So I figure that I can find out whether to use a proxy by looking at IE's proxy settings.

我怎么去呢？更具体地讲：

How do I go about this? More specifically:

• 有一组在Windows的代理设置，由所有的浏览器（IE可能的）使用，否则我将不得不写IE，Firefox，歌剧等？
不同的例程

• 我知道，我也许可以读出的值直接，如果他们是手动配置相应的注册表位置，但是这也与合作自动检测代理服务器？我连与该选项打扰，或者是（几乎）从来没有使用过？

在人们开始提示选择：我使用C，所以我仅限于Win32 API的，我真的真的想使用C和libcurl的保持

Before people start suggesting alternatives: I'm using C, so I'm limited to the Win32 API, and I really really want to keep using C and libcurl.

推荐答案

您正在寻找的功能是WinHttpGetIEProxyConfigForCurrentUser（），这是在<一个记录href=\"http://msdn.microsoft.com/en-us/library/aa384096(VS.85).aspx\">http://msdn.microsoft.com/en-us/library/aa384096(VS.85).aspx.此功能使用Firefox和Opera默认情况下得到他们的代理设置，虽然可以按浏览器覆盖它们。不这样做，虽然。正确的事情（这是其他人一样）是刚刚获得IE设置，并认为他们是正确的，因为他们几乎总是

The function you're looking for is WinHttpGetIEProxyConfigForCurrentUser(), which is documented at http://msdn.microsoft.com/en-us/library/aa384096(VS.85).aspx. This function is used by Firefox and Opera to get their proxy settings by default, although you can override them per-browser. Don't do that, though. The right thing to do (which is what everybody else does) is to just get the IE settings and assume that they're correct, since they almost always are.

下面是相关的逻辑，你应该为你的需要适应的一个示例：

Here's a sample of the relevant logic, which you should adapt for your needs:

if( WinHttpGetIEProxyConfigForCurrentUser( &ieProxyConfig ) )
{
    if( ieProxyConfig.fAutoDetect )
    {
        fAutoProxy = TRUE;
    }

    if( ieProxyConfig.lpszAutoConfigUrl != NULL )
    {
        fAutoProxy = TRUE;
        autoProxyOptions.lpszAutoConfigUrl = ieProxyConfig.lpszAutoConfigUrl;
    }
}
else
{
    // use autoproxy
    fAutoProxy = TRUE;
}

if( fAutoProxy )
{
    if ( autoProxyOptions.lpszAutoConfigUrl != NULL )
    {
        autoProxyOptions.dwFlags = WINHTTP_AUTOPROXY_CONFIG_URL;
    }
    else
    {
        autoProxyOptions.dwFlags = WINHTTP_AUTOPROXY_AUTO_DETECT;
        autoProxyOptions.dwAutoDetectFlags = WINHTTP_AUTO_DETECT_TYPE_DHCP | WINHTTP_AUTO_DETECT_TYPE_DNS_A;
    }

    // basic flags you almost always want
    autoProxyOptions.fAutoLogonIfChallenged = TRUE;

    // here we reset fAutoProxy in case an auto-proxy isn't actually
    // configured for this url
    fAutoProxy = WinHttpGetProxyForUrl( hiOpen, pwszUrl, &autoProxyOptions, &autoProxyInfo );
}

if ( fAutoProxy )
{
    // set proxy options for libcurl based on autoProxyInfo
}
else
{
    if( ieProxyConfig.lpszProxy != NULL )
    {
        // IE has an explicit proxy. set proxy options for libcurl here
        // based on ieProxyConfig
        //
        // note that sometimes IE gives just a single or double colon
        // for proxy or bypass list, which means "no proxy"
    }
    else
    {
        // there is no auto proxy and no manually configured proxy
    }
}

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