using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;

namespace POSV
{
    public class WindowsAPI
    {
        //窗口拖动
        public const int WM_NCLBUTTONDOWN = 0xA1;
        public const int HT_CAPTION = 0x2;

        [DllImport("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd , int Msg , int wParam , int lParam);
        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();

        public static void MoveWindows(IntPtr handle)
        {
            ReleaseCapture();
            SendMessage(handle , WM_NCLBUTTONDOWN , HT_CAPTION , 0);
        }

        //键盘
        public const uint KEYEVENTF_EXTENDEDKEY = 0x1;
        public const uint KEYEVENTF_KEYUP = 0x2;
        [System.Runtime.InteropServices.DllImport("user32.dll")]
        static extern short GetKeyState(int nVirtKey);
        [System.Runtime.InteropServices.DllImport("user32.dll")]
        static extern void keybd_event(byte bVk , byte bScan , uint dwFlags , uint dwExtraInfo);

        [DllImport("user32.dll")]
        public extern static void mouse_event(int dwFlags , int dx , int dy , int dwData , int dwExtraInfo);
        [DllImport("user32.dll")]
        public extern static bool SetCursorPos(int X , int Y);

        public enum MouseEventFlags
        {
            Move = 0x0001,
            LeftDown = 0x0002,
            LeftUp = 0x0004,
            RightDown = 0x0008,
            RightUp = 0x0010,
            MiddleDown = 0x0020,
            MiddleUp = 0x0040,
            Wheel = 0x0800,
            Absolute = 0x8000
        }

        public enum VirtualKeys : byte
        {
            VK_NUMLOCK = 0x90, //数字锁定键
            VK_SCROLL = 0x91, //滚动锁定
            VK_CAPITAL = 0x14, //大小写锁定
            VK_A = 62
        }

        public static bool GetState(VirtualKeys Key)
        {
            return (GetKeyState((int)Key) == 1);
        }
        public static void SetState(VirtualKeys Key , bool State)
        {
            if (State != GetState(Key))
            {
                keybd_event((byte)Key , 0x45 , KEYEVENTF_EXTENDEDKEY | 0 , 0);
                keybd_event((byte)Key , 0x45 , KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP , 0);
            }
        }

        ////开启键盘大写
        //SetState(VirtualKeys.VK_CAPITAL, true);
        ////关闭键盘大写
        //SetState(VirtualKeys.VK_CAPITAL, false);
        ////开启键盘滚动锁定
        //SetState(VirtualKeys.VK_SCROLL, true);
        ////关闭键盘滚动锁定
        //SetState(VirtualKeys.VK_SCROLL, false);
        ////开启键盘数字锁定键
        //SetState(VirtualKeys.VK_NUMLOCK, true);
        ////关闭键盘数字锁定键
        //SetState(VirtualKeys.VK_NUMLOCK, false);

        public const int WM_SYSCOMMAND = 0x0112;
        public const int SC_CLOSE = 0xF060;
        [System.Runtime.InteropServices.DllImport("user32.dll" , CharSet = System.Runtime.InteropServices.CharSet.Auto , SetLastError = true)]
        public static extern IntPtr FindWindow(String sClassName , String sAppName);
        [System.Runtime.InteropServices.DllImport("user32.dll" , CharSet = System.Runtime.InteropServices.CharSet.Auto , SetLastError = true)]
        public static extern int SendMessage(IntPtr hWnd , uint Msg , int wParam , int lParam);


        [System.Runtime.InteropServices.DllImport("wininet.dll")]
        public extern static bool InternetGetConnectedState(out int description , int reservedValue);

        [DllImport("user32.dll" , CharSet = CharSet.Auto , ExactSpelling = true)]
        public static extern int GetSystemMetrics(int nIndex);
        public bool IsTouchAvailable()
        {
            return ((GetSystemMetrics(0x5e) & 0x40) > 0);
        }

        [DllImport("gdi32.dll", EntryPoint = "AddFontResourceW", SetLastError = true)]
        public static extern int AddFontResource([In][MarshalAs(UnmanagedType.LPWStr)] string lpFileName);
    }
}