C# と VB.NET の質問掲示板

■No78118 (Azulean さん) に返信
> ■No78114 (NOVO さん) に返信
>>VBでは出来ないんでしょうか･･･
VBは門外漢なので、C#になります。
VisualStudio 2013, .NET Framework 4.5.2環境で作成、動作確認はしていません。

using System;
using System.Runtime.InteropServices;

namespace AR
{
    public class AutoRotation
    {
        [Flags]
        public enum AR_STATE : int
        {
            AR_ENABLED = 0x0,
            AR_DISABLED = 0x1,
            AR_SUPPRESSED = 0x2,
            AR_REMOTESESSION = 0x4,
            AR_MULTIMON = 0x8,
            AR_NOSENSOR = 0x10,
            AR_NOT_SUPPORTED = 0x20,
            AR_DOCKED = 0x40,
            AR_LAPTOP = 0x80
        };

        public enum ORIENTATION_PREFERENCE : int
        {
            ORIENTATION_PREFERENCE_NONE = 0x0,
            ORIENTATION_PREFERENCE_LANDSCAPE = 0x1,
            ORIENTATION_PREFERENCE_PORTRAIT = 0x2,
            ORIENTATION_PREFERENCE_LANDSCAPE_FLIPPED = 0x4,
            ORIENTATION_PREFERENCE_PORTRAIT_FLIPPED = 0x8
        };

        public static bool IsRotateEnabled()
        {
            AR_STATE autoRotationState = 0;
            bool success = GetAutoRotationState(out autoRotationState);
            if (!success)
            {
                return false;   // disable
            }

            return autoRotationState.HasFlag(AR_STATE.AR_ENABLED);
        }

        public static ORIENTATION_PREFERENCE GetRotation()
        {
            ORIENTATION_PREFERENCE orientation;
            bool success = GetDisplayAutoRotationPreferences(out orientation);
            if (!success)
            {
                return ORIENTATION_PREFERENCE.ORIENTATION_PREFERENCE_NONE;
            }

            return orientation;
        }

        public static bool SetRotation(ORIENTATION_PREFERENCE orientation)
        {
            return SetDisplayAutoRotationPreferences(orientation);
        }

        [DllImport("Kernel.dll")]
        private static extern bool GetAutoRotationState(out AR_STATE pState);

        [DllImport("Kernel.dll")]
        private static extern bool GetDisplayAutoRotationPreferences(out ORIENTATION_PREFERENCE pOrientation);

        [DllImport("Kernel.dll")]
        private static extern bool SetDisplayAutoRotationPreferences(ORIENTATION_PREFERENCE orientation);
    }
}