C# Signature:

[DllImport("wininet.dll", SetLastError = true, CharSet=CharSet.Auto)]
public static extern bool InternetSetOption(IntPtr hInternet, int
dwOption, string lpBuffer, int dwBufferLength);

VB Signature:

Declare Function InternetSetOption Lib "wininet.dll" (TODO) As TODO

User-Defined Types:

None.

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

Public struct Struct_INTERNET_PROXY_INFO

{

public int dwAccessType;

public IntPtr proxy;

public IntPtr proxyBypass;

};

[DllImport("wininet.dll", SetLastError = true)]

private static extern bool InternetSetOption(IntPtr hInternet,

int dwOption,

IntPtr lpBuffer,

int lpdwBufferLength);

private void RefreshIESettings(string strProxy)

{

const int INTERNET_OPTION_PROXY = 38;

const int INTERNET_OPEN_TYPE_PROXY = 3;

Struct_INTERNET_PROXY_INFO struct_IPI;

// Filling in structure

struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY;

struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy);

struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local");

// Allocating memory

IntPtr intptrStruct = Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI));

// Converting structure to IntPtr

Marshal.StructureToPtr(struct_IPI, intptrStruct, true);

bool iReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, Marshal.SizeOf(struct_IPI));

}

private void SomeFunc()

{

RefreshIESettings("1.2.3.4:8080");

//or RefreshIESettings("http://1.2.3.4:8080"); //both worked

//or RefreshIESettings("http=1.2.3.4:8080"); //both worked

System.Object nullObject = 0;

string strTemp = "";

System.Object nullObjStr = strTemp;

axWebBrowser1.Navigate("http://willstay.tripod.com", ref nullObject, ref nullObjStr, ref nullObjStr, ref nullObjStr);

}