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.
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
}
}