/// <summary>
/// Get the current system options for LAN connection.
/// Make sure free the memory after restoration.
/// </summary>
public static INTERNET_PER_CONN_OPTION_LIST GetSystemProxy()
{
// Query following options.
INTERNET_PER_CONN_OPTION[] Options = new INTERNET_PER_CONN_OPTION[3];
Options[0] = new INTERNET_PER_CONN_OPTION();
Options[0].dwOption = (int)INTERNET_PER_CONN_OptionEnum.INTERNET_PER_CONN_FLAGS;
Options[1] = new INTERNET_PER_CONN_OPTION();
Options[1].dwOption = (int)INTERNET_PER_CONN_OptionEnum.INTERNET_PER_CONN_PROXY_SERVER;
Options[2] = new INTERNET_PER_CONN_OPTION();
Options[2].dwOption = (int)INTERNET_PER_CONN_OptionEnum.INTERNET_PER_CONN_PROXY_BYPASS;
// Allocate a block of memory of the options.
System.IntPtr buffer = Marshal.AllocCoTaskMem(Marshal.SizeOf(Options[0])
+ Marshal.SizeOf(Options[1]) + Marshal.SizeOf(Options[2]));
System.IntPtr current = (System.IntPtr)buffer;
// Marshal data from a managed object to an unmanaged block of memory.
for (int i = 0; i < Options.Length; i++)
{
Marshal.StructureToPtr(Options[i], current, false);
current = (System.IntPtr)((int)current + Marshal.SizeOf(Options[i]));
}
// Initialize a INTERNET_PER_CONN_OPTION_LIST instance.
INTERNET_PER_CONN_OPTION_LIST Request = new INTERNET_PER_CONN_OPTION_LIST();
// Point to the allocated memory.
Request.pOptions = buffer;
Request.Size = Marshal.SizeOf(Request);
// IntPtr.Zero means LAN connection.
Request.Connection = IntPtr.Zero;
Request.OptionCount = Options.Length;
Request.OptionError = 0;
int size = Marshal.SizeOf(Request);
// Query system internet options.
bool result = NativeMethods.InternetQueryOption(
IntPtr.Zero,
INTERNET_OPTION.INTERNET_OPTION_PER_CONNECTION_OPTION,
ref Request,
ref size);
if (!result)
{
throw new ApplicationException("Get System Internet Option Failed! ");
}
return(Request);
}
internal extern static bool InternetQueryOption(
IntPtr hInternet,
INTERNET_OPTION dwOption,
ref INTERNET_PER_CONN_OPTION_LIST OptionList,
ref int lpdwBufferLength);
/// <summary>
/// Set the proxy server for LAN connection.
/// </summary>
static bool SetConnectionProxyInternal(IntPtr hInternet, string proxyServer, bool isPac)
{
// Create 3 options.
INTERNET_PER_CONN_OPTION[] Options = isPac ? new INTERNET_PER_CONN_OPTION[2] : new INTERNET_PER_CONN_OPTION[3];
// Set PROXY flags.
Options[0] = new INTERNET_PER_CONN_OPTION();
Options[0].dwOption = (int)INTERNET_PER_CONN_OptionEnum.INTERNET_PER_CONN_FLAGS;
if (isPac)
{
Options[0].Value.dwValue = (int)INTERNET_OPTION_PER_CONN_FLAGS.PROXY_TYPE_AUTO_PROXY_URL;
}
else
{
Options[0].Value.dwValue = (int)INTERNET_OPTION_PER_CONN_FLAGS.PROXY_TYPE_PROXY;
}
// Set proxy name.
Options[1] = new INTERNET_PER_CONN_OPTION();
if (isPac)
{
Options[1].dwOption = (int)INTERNET_PER_CONN_OptionEnum.INTERNET_PER_CONN_AUTOCONFIG_URL;
}
else
{
Options[1].dwOption =
(int)INTERNET_PER_CONN_OptionEnum.INTERNET_PER_CONN_PROXY_SERVER;
}
Options[1].Value.pszValue = Marshal.StringToHGlobalAnsi(proxyServer);
if (!isPac)
{
// Set proxy bypass.
Options[2] = new INTERNET_PER_CONN_OPTION();
Options[2].dwOption =
(int)INTERNET_PER_CONN_OptionEnum.INTERNET_PER_CONN_PROXY_BYPASS;
Options[2].Value.pszValue = Marshal.StringToHGlobalAnsi("local");
}
// Allocate a block of memory of the options.
System.IntPtr buffer = IntPtr.Zero;
if (isPac)
{
buffer = Marshal.AllocCoTaskMem(Marshal.SizeOf(Options[0])
+ Marshal.SizeOf(Options[1]));
}
else
{
buffer = Marshal.AllocCoTaskMem(Marshal.SizeOf(Options[0])
+ Marshal.SizeOf(Options[1]) + Marshal.SizeOf(Options[2]));
}
System.IntPtr current = buffer;
// Marshal data from a managed object to an unmanaged block of memory.
for (int i = 0; i < Options.Length; i++)
{
Marshal.StructureToPtr(Options[i], current, false);
current = (System.IntPtr)((int)current + Marshal.SizeOf(Options[i]));
}
// Initialize a INTERNET_PER_CONN_OPTION_LIST instance.
INTERNET_PER_CONN_OPTION_LIST option_list = new INTERNET_PER_CONN_OPTION_LIST();
// Point to the allocated memory.
option_list.pOptions = buffer;
// Return the unmanaged size of an object in bytes.
option_list.Size = Marshal.SizeOf(option_list);
// IntPtr.Zero means LAN connection.
option_list.Connection = IntPtr.Zero;
option_list.OptionCount = Options.Length;
option_list.OptionError = 0;
int size = Marshal.SizeOf(option_list);
// Allocate memory for the INTERNET_PER_CONN_OPTION_LIST instance.
IntPtr intptrStruct = Marshal.AllocCoTaskMem(size);
// Marshal data from a managed object to an unmanaged block of memory.
Marshal.StructureToPtr(option_list, intptrStruct, true);
// Set internet settings.
bool bReturn = NativeMethods.InternetSetOption(
hInternet,
INTERNET_OPTION.INTERNET_OPTION_PER_CONNECTION_OPTION,
intptrStruct, size);
// Free the allocated memory.
Marshal.FreeCoTaskMem(buffer);
Marshal.FreeCoTaskMem(intptrStruct);
// Throw an exception if this operation failed.
if (!bReturn)
{
throw new ApplicationException(" Set Internet Option Failed!");
}
// Notify the system that the registry settings have been changed and cause
// the proxy data to be reread from the registry for a handle.
NativeMethods.InternetSetOption(
hInternet,
INTERNET_OPTION.INTERNET_OPTION_SETTINGS_CHANGED,
IntPtr.Zero, 0);
NativeMethods.InternetSetOption(
hInternet,
INTERNET_OPTION.INTERNET_OPTION_REFRESH,
IntPtr.Zero, 0);
return(bReturn);
}
public static bool DisableSystemProxy()
{
IntPtr hInternet = IntPtr.Zero;
INTERNET_PER_CONN_OPTION[] Options = new INTERNET_PER_CONN_OPTION[1];
// Set PROXY flags.
Options[0] = new INTERNET_PER_CONN_OPTION();
Options[0].dwOption = (int)INTERNET_PER_CONN_OptionEnum.INTERNET_PER_CONN_FLAGS;
Options[0].Value.dwValue = (int)INTERNET_OPTION_PER_CONN_FLAGS.PROXY_TYPE_DIRECT;
// Allocate a block of memory of the options.
System.IntPtr buffer = Marshal.AllocCoTaskMem(Marshal.SizeOf(Options[0]));
System.IntPtr current = buffer;
// Marshal data from a managed object to an unmanaged block of memory.
Marshal.StructureToPtr(Options[0], current, false);
// Initialize a INTERNET_PER_CONN_OPTION_LIST instance.
INTERNET_PER_CONN_OPTION_LIST option_list = new INTERNET_PER_CONN_OPTION_LIST();
// Point to the allocated memory.
option_list.pOptions = buffer;
// Return the unmanaged size of an object in bytes.
option_list.Size = Marshal.SizeOf(option_list);
// IntPtr.Zero means LAN connection.
option_list.Connection = IntPtr.Zero;
option_list.OptionCount = Options.Length;
option_list.OptionError = 0;
int size = Marshal.SizeOf(option_list);
// Allocate memory for the INTERNET_PER_CONN_OPTION_LIST instance.
IntPtr intptrStruct = Marshal.AllocCoTaskMem(size);
// Marshal data from a managed object to an unmanaged block of memory.
Marshal.StructureToPtr(option_list, intptrStruct, true);
// Set internet settings.
bool bReturn = NativeMethods.InternetSetOption(
hInternet,
INTERNET_OPTION.INTERNET_OPTION_PER_CONNECTION_OPTION,
intptrStruct, size);
// Free the allocated memory.
Marshal.FreeCoTaskMem(buffer);
Marshal.FreeCoTaskMem(intptrStruct);
// Throw an exception if this operation failed.
if (!bReturn)
{
throw new ApplicationException(" Set Internet Option Failed!");
}
// Notify the system that the registry settings have been changed and cause
// the proxy data to be reread from the registry for a handle.
NativeMethods.InternetSetOption(
hInternet,
INTERNET_OPTION.INTERNET_OPTION_SETTINGS_CHANGED,
IntPtr.Zero, 0);
NativeMethods.InternetSetOption(
hInternet,
INTERNET_OPTION.INTERNET_OPTION_REFRESH,
IntPtr.Zero, 0);
return(bReturn);
}
