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) // Strproxy is an agent IP: port: port: port: port: port: port: port: port: port
{
const int INTERNET_OPTION_PROXY = 38;
const int INTERNET_OPEN_TYPE_PROXY = 3;
const int INTERNET_OPEN_TYPE_DIRECT = 1;
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));
if (string.IsNullOrEmpty(strProxy) || strProxy.Trim().Length == 0)
{
strProxy = string.Empty;
struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_DIRECT;
}
// Converting structure to IntPtr
Marshal.StructureToPtr(struct_IPI, intptrStruct, true);
bool iReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, Marshal.SizeOf(struct_IPI));
}
Use: refreshieSettings (“xxx.xxxxxxxxxxxxxx”);
Perfect method:
/*Complete analysis
public class IEProxy
{
private const int INTERNET_OPTION_PROXY = 38;
private const int INTERNET_OPEN_TYPE_PROXY = 3;
private const int INTERNET_OPEN_TYPE_DIRECT = 1;
private string ProxyStr;
[DllImport(“wininet.dll”, SetLastError = true)]
private static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int lpdwBufferLength);
public struct Struct_INTERNET_PROXY_INFO
{
public int dwAccessType;
public IntPtr proxy;
public IntPtr proxyBypass;
}
private bool InternetSetOption(string strProxy)
{
int bufferLength;
IntPtr intptrStruct;
Struct_INTERNET_PROXY_INFO struct_IPI;
if (string.IsNullOrEmpty(strProxy) || strProxy.Trim().Length == 0)
{
strProxy = string.Empty;
struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_DIRECT;
}
else
{
struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY;
}
struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy);
struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi(“local”);
bufferLength = Marshal.SizeOf(struct_IPI);
intptrStruct = Marshal.AllocCoTaskMem(bufferLength);
Marshal.StructureToPtr(struct_IPI, intptrStruct, true);
return InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, bufferLength);
}
public IEProxy(string strProxy)
{
this.ProxyStr = strProxy;
}
// Set proxy
public bool RefreshIESettings()
{
return InternetSetOption(this.ProxyStr);
}
// Cancel the agent
public bool DisableIEProxy()
{
return InternetSetOption(string.Empty);
}
}
*/