/// <summary>
/// Backup the current options for LAN connection.
/// Make sure free the memory after restoration.
/// </summary>
public override SystemProxy GetSystemProxy()
{
// Initialize a INTERNET_PER_CONN_OPTION_LIST instance.
INTERNET_PER_CONN_OPTION_LIST Request = new INTERNET_PER_CONN_OPTION_LIST();
// Query following options.
INTERNET_PER_CONN_OPTION[] Options = new INTERNET_PER_CONN_OPTION[4];
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;
Options[3] = new INTERNET_PER_CONN_OPTION();
Options[3].dwOption = (int)INTERNET_PER_CONN_OptionEnum.INTERNET_PER_CONN_AUTOCONFIG_URL;
// 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]) + Marshal.SizeOf(Options[3]));
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]));
}
// 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 internet options.(buggy0
bool result = InternetQueryOptionList(IntPtr.Zero,
INTERNET_OPTION.INTERNET_OPTION_PER_CONNECTION_OPTION,
ref Request, ref size);
if (!result)
{
throw new ApplicationException(" Set Internet Option Failed! ");
}
current = buffer;
for (int i = 0; i < Options.Length; i++)
{
Options[i] = (INTERNET_PER_CONN_OPTION)Marshal.PtrToStructure(current, typeof(INTERNET_PER_CONN_OPTION));
current = (System.IntPtr)((int)current + Marshal.SizeOf(Options[i]));
}
SystemProxy sp = new SystemProxy();
sp.IsDirect = (Options[0].Value.dwValue & (int)INTERNET_OPTION_PER_CONN_FLAGS.PROXY_TYPE_DIRECT)
== (int)INTERNET_OPTION_PER_CONN_FLAGS.PROXY_TYPE_DIRECT;
sp.IsProxy = (Options[0].Value.dwValue & (int)INTERNET_OPTION_PER_CONN_FLAGS.PROXY_TYPE_PROXY)
== (int)INTERNET_OPTION_PER_CONN_FLAGS.PROXY_TYPE_PROXY;
sp.IsAutoDetect = (Options[0].Value.dwValue & (int)INTERNET_OPTION_PER_CONN_FLAGS.PROXY_TYPE_AUTO_DETECT)
== (int)INTERNET_OPTION_PER_CONN_FLAGS.PROXY_TYPE_AUTO_DETECT;
sp.IsPac = (Options[0].Value.dwValue & (int)INTERNET_OPTION_PER_CONN_FLAGS.PROXY_TYPE_AUTO_PROXY_URL)
== (int)INTERNET_OPTION_PER_CONN_FLAGS.PROXY_TYPE_AUTO_PROXY_URL;
sp.PacPath = Marshal.PtrToStringAnsi(Options[3].Value.pszValue);
sp.ProxyAddress = Marshal.PtrToStringAnsi(Options[1].Value.pszValue);
Marshal.FreeCoTaskMem(Request.pOptions);
return(sp);
}
public abstract bool SetSystemProxy(SystemProxy sp);
/// <summary>
/// Set the proxy server for LAN connection.
/// </summary>
public override bool SetSystemProxy(SystemProxy sp)
{
//IntPtr hInternet = InternetOpen(applicationName, INTERNET_OPEN_TYPE_DIRECT, null, null, 0);
INTERNET_PER_CONN_OPTION[] Options = new INTERNET_PER_CONN_OPTION[3];
int flag = 0;
if (sp.IsAutoDetect)
{
flag |= (int)INTERNET_OPTION_PER_CONN_FLAGS.PROXY_TYPE_AUTO_DETECT;
}
if (sp.IsDirect)
{
flag |= (int)INTERNET_OPTION_PER_CONN_FLAGS.PROXY_TYPE_DIRECT;
}
if (sp.IsPac)
{
flag |= (int)INTERNET_OPTION_PER_CONN_FLAGS.PROXY_TYPE_AUTO_PROXY_URL;
}
if (sp.IsProxy)
{
flag |= (int)INTERNET_OPTION_PER_CONN_FLAGS.PROXY_TYPE_PROXY;
}
// 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 = flag;
// Set proxy name.
Options[1] = new INTERNET_PER_CONN_OPTION();
Options[1].dwOption =
(int)INTERNET_PER_CONN_OptionEnum.INTERNET_PER_CONN_PROXY_SERVER;
Options[1].Value.pszValue = Marshal.StringToHGlobalAnsi(sp.ProxyAddress);
// Set proxy pac.
Options[2] = new INTERNET_PER_CONN_OPTION();
Options[2].dwOption =
(int)INTERNET_PER_CONN_OptionEnum.INTERNET_PER_CONN_AUTOCONFIG_URL;
Options[2].Value.pszValue = Marshal.StringToHGlobalAnsi(sp.PacPath);
System.IntPtr 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 = InternetSetOption(IntPtr.Zero,
INTERNET_OPTION.INTERNET_OPTION_PER_CONNECTION_OPTION, intptrStruct, size);
// Free the allocated memory.
Marshal.FreeCoTaskMem(buffer);
Marshal.FreeCoTaskMem(intptrStruct);
//InternetCloseHandle(hInternet);
// Throw an exception if this operation failed.
if (!bReturn)
{
throw new ApplicationException(" Set Internet Option Failed!");
}
return(bReturn);
}
