get winhttp proxy setting by powershell(using p/invoke)

get-winhttpproxy.ps1

# based on http://stackoverflow.com/questions/4265427/programmatically-set-proxy-address-port-username-password
$MethodDefinition = @'
using System.Runtime.InteropServices;
public enum AccessType
{
    DefaultProxy = 0,
    NamedProxy = 3,
    NoProxy = 1
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct WINHTTP_PROXY_INFO
{
    public AccessType AccessType;
    public string Proxy;
    public string Bypass;
}
public class WinHttp
{
    [DllImport("winhttp.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    public static extern bool WinHttpGetDefaultProxyConfiguration(ref WINHTTP_PROXY_INFO config);
}
'@
$asm = Add-Type -TypeDefinition $MethodDefinition -PassThru
$obj = New-Object WINHTTP_PROXY_INFO
$obj.AccessType = [AccessType]::DefaultProxy
$ret = [WinHttp]::WinHttpGetDefaultProxyConfiguration([ref]$obj)
$obj