_WinHttpWebProxyDataBuilder.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / _WinHttpWebProxyDataBuilder.cs / 1305376 / _WinHttpWebProxyDataBuilder.cs
                        

                        
                            using System; 
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices; 

namespace System.Net 
{ 
    internal sealed class WinHttpWebProxyBuilder : WebProxyDataBuilder
    { 
        protected override void BuildInternal()
        {
            GlobalLog.Enter("WinHttpWebProxyBuilder#" + ValidationHelper.HashString(this) + "::BuildInternal()");
 
            UnsafeNclNativeMethods.WinHttp.WINHTTP_CURRENT_USER_IE_PROXY_CONFIG ieProxyConfig =
                new UnsafeNclNativeMethods.WinHttp.WINHTTP_CURRENT_USER_IE_PROXY_CONFIG(); 
 
            // Make sure the native strings get freed, even if some unexpected exception occurs.
            RuntimeHelpers.PrepareConstrainedRegions(); 
            try
            {
                if (UnsafeNclNativeMethods.WinHttp.WinHttpGetIEProxyConfigForCurrentUser(ref ieProxyConfig))
                { 
                    string proxy = null;
                    string proxyByPass = null; 
                    string autoConfigUrl = null; 

                    proxy = Marshal.PtrToStringUni(ieProxyConfig.Proxy); 
                    proxyByPass = Marshal.PtrToStringUni(ieProxyConfig.ProxyBypass);
                    autoConfigUrl = Marshal.PtrToStringUni(ieProxyConfig.AutoConfigUrl);

                    // note that ieProxyConfig.Proxy will be null if "use a proxy server" flag is turned off, even if 
                    // the user specified a proxy address. When we read directly from the Registry we need to check
                    // for ProxyTypeFlags.PROXY_TYPE_PROXY. WinHttp does this for us and if the flag is not set, 
                    // ieProxyConfig.Proxy will be null. 
                    SetProxyAndBypassList(proxy, proxyByPass);
 
                    SetAutoDetectSettings(ieProxyConfig.AutoDetect);

                    // similar to comment above: ieProxyConfig.AutoConfigUrl will only be set if "automatically detect
                    // settings" flag is set. We don't need to check ProxyTypeFlags.PROXY_TYPE_AUTO_PROXY_URL; WinHttp 
                    // takes care of it and sets AutoConfigUrl to null if the flag is not set, regardless of the actual
                    // config script string. 
                    SetAutoProxyUrl(autoConfigUrl); 
                }
                else 
                {
                    int errorCode = Marshal.GetLastWin32Error();

                    if (errorCode == Microsoft.Win32.NativeMethods.ERROR_NOT_ENOUGH_MEMORY) 
                    {
                        throw new OutOfMemoryException(); 
                    } 

                    // if API call fails, rely on automatic detection 
                    SetAutoDetectSettings(true);
                }
            }
            finally 
            {
                Marshal.FreeHGlobal(ieProxyConfig.Proxy); 
                Marshal.FreeHGlobal(ieProxyConfig.ProxyBypass); 
                Marshal.FreeHGlobal(ieProxyConfig.AutoConfigUrl);
            } 

            GlobalLog.Leave("WinHttpWebProxyBuilder#" + ValidationHelper.HashString(this) + "::BuildInternal()");
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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