/// <summary>
/// Asynchronously requests wireless interfaces to scan (rescan) wireless LANs.
/// </summary>
/// <param name="timeout">Timeout duration</param>
/// <param name="cancellationToken">Cancellation token</param>
/// <returns>Interface IDs that successfully scanned</returns>
public static async Task <IEnumerable <Guid> > ScanNetworksAsync(TimeSpan timeout, CancellationToken cancellationToken)
{
using (var client = new Base.WlanClient())
{
var interfaceInfoList = Base.GetInterfaceInfoList(client.Handle);
var interfaceIds = interfaceInfoList.Select(x => x.InterfaceGuid).ToArray();
var tcs = new TaskCompletionSource <bool>();
var handler = new ScanHandler(tcs, interfaceIds);
Action <IntPtr, IntPtr> callback = (data, context) =>
{
var notificationData = Marshal.PtrToStructure <WLAN_NOTIFICATION_DATA>(data);
if (notificationData.NotificationSource != WLAN_NOTIFICATION_SOURCE_ACM)
{
return;
}
Debug.WriteLine("Callback: {0}", (WLAN_NOTIFICATION_ACM)notificationData.NotificationCode);
switch (notificationData.NotificationCode)
{
case (uint)WLAN_NOTIFICATION_ACM.wlan_notification_acm_scan_complete:
handler.SetSuccess(notificationData.InterfaceGuid);
break;
case (uint)WLAN_NOTIFICATION_ACM.wlan_notification_acm_scan_fail:
handler.SetFailure(notificationData.InterfaceGuid);
break;
}
};
Base.RegisterNotification(client.Handle, WLAN_NOTIFICATION_SOURCE_ACM, callback);
foreach (var interfaceId in interfaceIds)
{
var result = Base.Scan(client.Handle, interfaceId);
if (!result)
{
handler.SetFailure(interfaceId);
}
}
var scanTask = tcs.Task;
await Task.WhenAny(scanTask, Task.Delay(timeout, cancellationToken));
return(handler.Results);
}
}
