C# Signature:

[DllImport("shell32.dll")]
static extern int SHQueryUserNotificationState(
     out QUERY_USER_NOTIFICATION_STATE pquns);

VB Signature:

Declare Function SHQueryUserNotificationState Lib "shell32.dll" (TODO) As int

User-Defined Types:

enum QUERY_USER_NOTIFICATION_STATE
{
     QUNS_NOT_PRESENT = 1,
     QUNS_BUSY = 2,
     QUNS_RUNNING_D3D_FULL_SCREEN = 3,
     QUNS_PRESENTATION_MODE = 4,
     QUNS_ACCEPTS_NOTIFICATIONS = 5,
     QUNS_QUIET_TIME = 6
};

Alternative Managed API:

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Notes:

None.

Tips & Tricks:

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Sample Code:

void Main()
{
    Console.WriteLine("user notification state: {0}", QueryUserNotificationState.State());    
}

// Define other methods and classes here
class QueryUserNotificationState
{
    public enum UserNotificationState
    {
        NotPresent = 1,
         Busy = 2,
         RunningDirect3dFullScreen = 3,
         PresentationMode = 4,
         AcceptsNotifications = 5,
         QuietTime = 6
    };

    [DllImport("shell32.dll")]
    static extern int SHQueryUserNotificationState(out UserNotificationState pquns);

    public static UserNotificationState State()
    {
        UserNotificationState state;
        var returnVal = SHQueryUserNotificationState(out state);

        return state;
    }
}

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