How to make the WebBrowser control use a proxy server

Article ID: 2563548
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INTRODUCTION

This article describes an All-In-One Code Framework sample that is available for download. The sample demonstrates how to make the WebBrowser control use a proxy server.

Difficulty level

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codefx Medium

Download information

To download this code sample, click one of the following links:

    

Technical overview

In Internet Explorer 5 and later versions of Internet Explorer 5, Internet options can be set on a specific connection and process. For example, Internet options can be set on the LAN connection or on the ADSL connection. Wininet.dll component contains the following four extern methods to set and retrieve Internet settings:
  • InternetOpen
  • InternetCloseHandle
  • InternetSetOption
  • InternetQueryOption

Sample overview

/// <summary>
        /// Initialize an application's use of the WinINet functions.
        /// See 
        /// </summary>
        [DllImport("wininet.dll", SetLastError = true, CharSet = CharSet.Auto)]
        internal static extern IntPtr InternetOpen(
            string lpszAgent,
            int dwAccessType,
            string lpszProxyName,
            string lpszProxyBypass,
            int dwFlags);
 
        /// <summary>
        /// Close a single Internet handle.
        /// </summary>
        [DllImport("wininet.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool InternetCloseHandle(IntPtr hInternet);
 
        /// <summary>
        /// Sets an Internet option.
        /// </summary>
        [DllImport("wininet.dll", CharSet = CharSet.Ansi, SetLastError = true)]
        internal static extern bool InternetSetOption(
            IntPtr hInternet,
            INTERNET_OPTION dwOption,
            IntPtr lpBuffer,
            int lpdwBufferLength);
 
        /// <summary>
        /// Queries an Internet option on the specified handle. The Handle will be always 0.
        /// </summary>
        [DllImport("wininet.dll", CharSet = CharSet.Ansi, SetLastError = true)]
        internal extern static bool InternetQueryOption(
            IntPtr hInternet,
            INTERNET_OPTION dwOption,
            ref INTERNET_PER_CONN_OPTION_LIST OptionList,
            ref int lpdwBufferLength);

Technology category

  • Windows Forms
  • Network

Languages

This code sample is available in the following programming languages:
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LanguageProject Name
Visual C#CSWebBrowserWithProxy
Visual Basic.NETVBWebBrowserWithProxy

Prerequisites

This sample application is developed by using Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.

References

For more information the InternetSetOption function, visit the following MSDN website: 
General information the InternetSetOption function
For more information the InternetQueryOption function, visit the following MSDN website:
General information the InternetQueryOption function
For more information the INTERNET_PER_CONN_OPTION structure, visit the following MSDN website:
General information the INTERNET_PER_CONN_OPTION structure
For more information how to set and retrieve Internet options, visit the following MSDN website:
How to set and retrieve Internet options

MORE INFORMATION

What is All-In-One Code Framework?

All-In-One Code Framework shows most Microsoft development techniques by using code samples in different programming languages. Each example is carefully selected, composed, and documented to show one common code scenario. For more information about All-In-One Code Framework, visit the following Microsoft website:
http://1code.codeplex.com

How to find more All-In-One Code Framework samples

To find more All-In-One Code Framework samples, search for "kbcodefx" together with related keywords on the Microsoft support Web site. Or, visit the following Microsoft website:
All-In-One Code Framework samples
Rapid publishing disclaimer
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Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.

Properties

Article ID: 2563548 - Last Review: June 24, 2011 - Revision: 1.0
Keywords: 
kbcodefx kbinfo kbsurveynew kbnomt kbrapidpub atdownload KB2563548

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