/ManagedNativeWifi

A managed implementation of Native Wifi API

Primary LanguageC#MIT LicenseMIT

Managed Native Wifi

A managed implementation of Native Wifi API

##Requirements

  • Windows 7 or newer
  • .NET Framework 4.5.2

##Methods

Available methods including asynchronous ones based on TAP.

Method Description
EnumerateInterfaces Enumerates wireless interface information.
ScanNetworksAsync Asynchronously requests wireless interfaces to scan (rescan) wireless LANs.
EnumerateAvailableNetworkSsids Enumerates SSIDs of available wireless LANs.
EnumerateConnectedNetworkSsids Enumerates SSIDs of connected wireless LANs.
EnumerateAvailableNetworks Enumerates wireless LAN information on available networks.
EnumerateBssNetworks Enumerates wireless LAN information on BSS networks.
EnumerateProfileNames Enumerates wireless profile names in preference order.
EnumerateProfiles Enumerates wireless profile information in preference order.
SetProfile Sets (add or overwrite) the content of a specified wireless profile.
SetProfilePosition Sets the position of a specified wireless profile in preference order.
DeleteProfile Deletes a specified wireless profile.
ConnectNetwork Attempts to connect to the wireless LAN associated to a specified wireless profile.
ConnectNetworkAsync Asynchronously attempts to connect to the wireless LAN associated to a specified wireless profile.
DisconnectNetwork Disconnects from the wireless LAN associated to a specified wireless interface.
DisconnectNetworkAsync Asynchronously disconnects from the wireless LAN associated to a specified wireless interface.
GetInterfaceRadio Gets wireless interface radio information of a specified wireless interface.
TurnOnInterfaceRadio Turns on the radio of a specified wireless interface (software radio state only).
TurnOffInterfaceRadio Turns off the radio of a specified wireless interface (software radio state only).

##Usage

To check SSIDs of currently available wireless LANs, call EnumerateAvailableNetworkSsids method.

public static IEnumerable<string> EnumerateNetworkSsids()
{
    return NativeWifi.EnumerateAvailableNetworkSsids()
        .Select(x => x.ToString()); // UTF-8 string representation
}

In general, a SSID is represented by a UTF-8 string but it is not guaranteed. So if ToString method seems not to produce a valid value, try ToBytes method instead.

To connect to a wireless LAN, call ConnectNetworkAsync asynchronous method.

public static async Task<bool> ConnectAsync()
{
    var availableNetwork = NativeWifi.EnumerateAvailableNetworks()
        .Where(x => !string.IsNullOrWhiteSpace(x.ProfileName))
        .OrderByDescending(x => x.SignalQuality)
        .FirstOrDefault();

    if (availableNetwork == null)
        return false;

    return await NativeWifi.ConnectNetworkAsync(
        interfaceId: availableNetwork.Interface.Id,
        profileName: availableNetwork.ProfileName,
        bssType: availableNetwork.BssType,
        timeout: TimeSpan.FromSeconds(10));
}

This method returns true if successfully connected to the wireless LAN in contrast to its synchronous sibling, ConnectNetwork method, returns true if the request for the connection succeeds and doesn't indicate the result.

To refresh currently available wireless LANs, call ScanNetworksAsync method.

public static async Task RefreshAsync()
{
    await NativeWifi.ScanNetworksAsync(timeout: TimeSpan.FromSeconds(10));
}

This method requests wireless interfaces to scan wireless LANs in parallel. It takes no more than 4 seconds.

To delete an existing wireless profile, use DeleteProfile method. Please note that a profile name is case-sensitive.

public static bool DeleteProfile(string profileName)
{
    var targetProfile = NativeWifi.EnumerateProfiles()
        .Where(x => profileName.Equals(x.Name, StringComparison.Ordinal))
        .FirstOrDefault();

    if (targetProfile == null)
        return false;

    return NativeWifi.DeleteProfile(
        interfaceId: targetProfile.Interface.Id,
        profileName: profileName);
}

To check wireless LAN channels that are already used by surrounding access points, call EnumerateBssNetworks method and filter the results by signal strength.

public static IEnumerable<int> EnumerateNetworkChannels(int signalStrengthThreshold)
{
    return NativeWifi.EnumerateBssNetworks()
        .Where(x => x.SignalStrength > signalStrengthThreshold)
        .Select(x => x.Channel);
}

To turn on the radio of a wireless interface, check the current radio state by GetInterfaceRadio method and then call TurnOnInterfaceRadio method.

public static async Task<bool> TurnOnAsync()
{
    var targetInterface = NativeWifi.EnumerateInterfaces()
        .FirstOrDefault(x =>
        {
            var radioSet = NativeWifi.GetInterfaceRadio(x.Id)?.RadioSets.FirstOrDefault();
            if (radioSet == null)
                return false;

            if (!radioSet.HardwareOn.GetValueOrDefault()) // Hardware radio state is off.
                return false;

            return (radioSet.SoftwareOn == false); // Software radio state is off.
        });

    if (targetInterface == null)
        return false;

    try
    {
        return await Task.Run(() => NativeWifi.TurnOnInterfaceRadio(targetInterface.Id));
    }
    catch (UnauthorizedAccessException)
    {
        return false;
    }
}

Please note that this method can only change software radio state and if hardware radio state is off (like hardware Wi-Fi switch is at off position), the radio cannot be turned on programatically.

##License

  • MIT License