private static bool SetSystemProxySettings(NativeMethods.InternetPerConnectionOptionList proxySettings)
{
int size = Marshal.SizeOf(proxySettings);
// Allocate memory.
IntPtr proxySettingBufferPointer = Marshal.AllocCoTaskMem(size);
// Convert structure to IntPtr
Marshal.StructureToPtr(proxySettings, proxySettingBufferPointer, true);
// Set internet options.
bool bReturn = NativeMethods.InternetSetOption(IntPtr.Zero, NativeMethods.InternetOption.PerConnectionOption, proxySettingBufferPointer, size);
// Free the allocated memory.
Marshal.FreeCoTaskMem(proxySettings.OptionsBufferPointer);
Marshal.FreeCoTaskMem(proxySettingBufferPointer);
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(IntPtr.Zero, NativeMethods.InternetOption.SettingsChanged, IntPtr.Zero, 0);
NativeMethods.InternetSetOption(IntPtr.Zero, NativeMethods.InternetOption.Refresh, IntPtr.Zero, 0);
return(bReturn);
}
private static NativeMethods.InternetPerConnectionOptionList GetSystemProxySettings()
{
// Query following options.
NativeMethods.InternetPerConnectionOption[] options = new NativeMethods.InternetPerConnectionOption[3];
options[0] = new NativeMethods.InternetPerConnectionOption();
options[0].Option = (int)NativeMethods.InternetPerConnectionOptionValue.Flags;
options[1] = new NativeMethods.InternetPerConnectionOption();
options[1].Option = (int)NativeMethods.InternetPerConnectionOptionValue.ProxyServer;
options[2] = new NativeMethods.InternetPerConnectionOption();
options[2].Option = (int)NativeMethods.InternetPerConnectionOptionValue.ProxyBypass;
// Allocate a block of memory of the options.
IntPtr buffer = Marshal.AllocCoTaskMem(Marshal.SizeOf(options[0]) + Marshal.SizeOf(options[1]) + Marshal.SizeOf(options[2]));
IntPtr current = (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 = (IntPtr)((int)current + Marshal.SizeOf(options[i]));
}
// Initialize a INTERNET_PER_CONN_OPTION_LIST instance.
NativeMethods.InternetPerConnectionOptionList proxySettings = new NativeMethods.InternetPerConnectionOptionList();
// Point to the allocated memory.
proxySettings.OptionsBufferPointer = buffer;
proxySettings.Size = Marshal.SizeOf(proxySettings);
// IntPtr.Zero means LAN connection.
proxySettings.Connection = IntPtr.Zero;
proxySettings.OptionCount = options.Length;
proxySettings.OptionError = 0;
int size = Marshal.SizeOf(proxySettings);
// Query internet options.
bool result = NativeMethods.InternetQueryOptionList(IntPtr.Zero, NativeMethods.InternetOption.PerConnectionOption, ref proxySettings, ref size);
if (!result)
{
throw new ApplicationException(" Set Internet Option Failed! ");
}
return(proxySettings);
}
private static NativeMethods.InternetPerConnectionOptionList CreateCustomProxySettings(string proxyString, string proxyBypassString)
{
// Create 3 options.
NativeMethods.InternetPerConnectionOption[] options = new NativeMethods.InternetPerConnectionOption[3];
// Set PROXY flags.
options[0] = new NativeMethods.InternetPerConnectionOption();
options[0].Option = (int)NativeMethods.InternetPerConnectionOptionValue.Flags;
options[0].Value.integerValue = (int)NativeMethods.InternetPerConnectionProxyFlags.Proxy;
// Set proxy name.
options[1] = new NativeMethods.InternetPerConnectionOption();
options[1].Option = (int)NativeMethods.InternetPerConnectionOptionValue.ProxyServer;
options[1].Value.stringValue = Marshal.StringToHGlobalAnsi(proxyString);
// Set proxy bypass.
options[2] = new NativeMethods.InternetPerConnectionOption();
options[2].Option = (int)NativeMethods.InternetPerConnectionOptionValue.ProxyBypass;
options[2].Value.stringValue = Marshal.StringToHGlobalAnsi(proxyBypassString);
// Allocate a block of memory of the options.
IntPtr buffer = Marshal.AllocCoTaskMem(Marshal.SizeOf(options[0]) + Marshal.SizeOf(options[1]) + Marshal.SizeOf(options[2]));
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 = (IntPtr)((int)current + Marshal.SizeOf(options[i]));
}
// Initialize a INTERNET_PER_CONN_OPTION_LIST instance.
NativeMethods.InternetPerConnectionOptionList proxySettings = new NativeMethods.InternetPerConnectionOptionList();
// Point to the allocated memory.
proxySettings.OptionsBufferPointer = buffer;
// Return the unmanaged size of an object in bytes.
proxySettings.Size = Marshal.SizeOf(proxySettings);
// IntPtr.Zero means LAN connection.
proxySettings.Connection = IntPtr.Zero;
proxySettings.OptionCount = options.Length;
proxySettings.OptionError = 0;
return(proxySettings);
}
