private static extern bool InternetQueryOption(
IntPtr hInternet,
int dwOption,
ref InternetPerConnectionOptionList optionsList,
ref int bufferLength
//IntPtr lpBuffer, //Pointer to a buffer that contains the option setting.
//int lpdwBufferLength //size of lpBuffer, in bytes.
);
private static InternetPerConnectionOption GetInternetConnectionOption(PerConnectionOption pco)
{
//Allocate the list and option.
InternetPerConnectionOptionList perConnOptList = new InternetPerConnectionOptionList();
InternetPerConnectionOption ico = new InternetPerConnectionOption();
//pin the option structure
GCHandle gch = GCHandle.Alloc(ico, GCHandleType.Pinned);
//initialize the option for the data we want
ico.option = pco;
//Initialize the option list for the default connection or LAN.
int listSize = Marshal.SizeOf(perConnOptList);
perConnOptList.size = listSize;
perConnOptList.connection = IntPtr.Zero;
perConnOptList.optionCount = 1;
perConnOptList.optionError = 0;
// figure out sizes & offsets
int icoSize = Marshal.SizeOf(ico);
int optionTotalSize = icoSize;
// alloc enough memory for the option
perConnOptList.options =
Marshal.AllocCoTaskMem(icoSize);
long icoOffset = (long)perConnOptList.options + (long)icoSize;
// Make pointer from the structure
IntPtr optionListPtr = perConnOptList.options;
Marshal.StructureToPtr(ico, optionListPtr, false);
//Make the query
if (InternetQueryOption(
IntPtr.Zero,
(int)InternetOption.INTERNET_OPTION_PER_CONNECTION_OPTION, //75
ref perConnOptList,
ref listSize) == true)
{
//retrieve the value
ico =
(InternetPerConnectionOption)Marshal.PtrToStructure(perConnOptList.options,
typeof(InternetPerConnectionOption));
}
// free the COM memory
Marshal.FreeCoTaskMem(perConnOptList.options);
//unpin the structs
gch.Free();
return(ico);
}
private static bool CallInternetSetOption(InternetPerConnectionOption[] options)
{
InternetPerConnectionOptionList optionList = new InternetPerConnectionOptionList();
optionList.size = Marshal.SizeOf(optionList);
optionList.connection = IntPtr.Zero; //Default Connection
optionList.optionCount = options.Length;
optionList.optionError = 0;
optionList.options = VarPtr(options);
int optionListSize = Marshal.SizeOf(optionList);
IntPtr optionListPtr = Marshal.AllocCoTaskMem(optionListSize);
Marshal.StructureToPtr(optionList, optionListPtr, true);
bool iReturn;
iReturn = InternetSetOption(IntPtr.Zero, (int)InternetOption.INTERNET_OPTION_PER_CONNECTION_OPTION, optionListPtr, Marshal.SizeOf(optionList));
if (iReturn == false)
{
Win32Exception exception = new Win32Exception(Marshal.GetLastWin32Error());
throw exception;
}
else
{
iReturn = InternetOptionSettingsChanged();
//if (iReturn == true)
//{
// iReturn = InternetOptionRefresh();
//}
}
// free the COM memory
Marshal.FreeCoTaskMem(optionListPtr);
return(iReturn);
}
public extern static bool InternetQueryOptionList(IntPtr Handle, InternetOption OptionFlag, ref InternetPerConnectionOptionList OptionList, ref int size);
private static extern bool InternetQueryOption(
IntPtr hInternet,
int dwOption,
ref InternetPerConnectionOptionList optionsList,
ref int bufferLength
//IntPtr lpBuffer, //Pointer to a buffer that contains the option setting.
//int lpdwBufferLength //size of lpBuffer, in bytes.
);
private static InternetPerConnectionOption GetInternetConnectionOption(PerConnectionOption pco)
{
//Allocate the list and option.
InternetPerConnectionOptionList perConnOptList = new InternetPerConnectionOptionList();
InternetPerConnectionOption ico = new InternetPerConnectionOption();
//pin the option structure
GCHandle gch = GCHandle.Alloc(ico, GCHandleType.Pinned);
//initialize the option for the data we want
ico.option = pco;
//Initialize the option list for the default connection or LAN.
int listSize = Marshal.SizeOf(perConnOptList);
perConnOptList.size = listSize;
perConnOptList.connection = IntPtr.Zero;
perConnOptList.optionCount = 1;
perConnOptList.optionError = 0;
// figure out sizes & offsets
int icoSize = Marshal.SizeOf(ico);
int optionTotalSize = icoSize;
// alloc enough memory for the option
perConnOptList.options =
Marshal.AllocCoTaskMem(icoSize);
long icoOffset = (long)perConnOptList.options + (long)icoSize;
// Make pointer from the structure
IntPtr optionListPtr = perConnOptList.options;
Marshal.StructureToPtr(ico, optionListPtr, false);
//Make the query
if (InternetQueryOption(
IntPtr.Zero,
(int)InternetOption.INTERNET_OPTION_PER_CONNECTION_OPTION, //75
ref perConnOptList,
ref listSize) == true)
{
//retrieve the value
ico =
(InternetPerConnectionOption)Marshal.PtrToStructure(perConnOptList.options,
typeof(InternetPerConnectionOption));
}
// free the COM memory
Marshal.FreeCoTaskMem(perConnOptList.options);
//unpin the structs
gch.Free();
return ico;
}
private static bool CallInternetSetOption(InternetPerConnectionOption[] options)
{
InternetPerConnectionOptionList optionList = new InternetPerConnectionOptionList();
optionList.size = Marshal.SizeOf(optionList);
optionList.connection = IntPtr.Zero; //Default Connection
optionList.optionCount = options.Length;
optionList.optionError = 0;
optionList.options = VarPtr(options);
int optionListSize = Marshal.SizeOf(optionList);
IntPtr optionListPtr = Marshal.AllocCoTaskMem(optionListSize);
Marshal.StructureToPtr(optionList, optionListPtr, true);
bool iReturn;
iReturn = InternetSetOption(IntPtr.Zero, (int)InternetOption.INTERNET_OPTION_PER_CONNECTION_OPTION, optionListPtr, Marshal.SizeOf(optionList));
if (iReturn == false)
{
Win32Exception exception = new Win32Exception(Marshal.GetLastWin32Error());
throw exception;
}
else
{
iReturn = InternetOptionSettingsChanged();
//if (iReturn == true)
//{
// iReturn = InternetOptionRefresh();
//}
}
// free the COM memory
Marshal.FreeCoTaskMem(optionListPtr);
return iReturn;
}