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using System;
using System.Data;
using System.Runtime.InteropServices;

namespace xxx
{
    public class VoiceRecorder
    {
        #region API prototypes
        [DllImport("voicectl.dll", EntryPoint = "VoiceRecorder_Create")]
        private unsafe static extern IntPtr VoiceRecorder_Create(CM_VOICE_RECORDER* voicerec);

        [DllImport("coredll.dll", EntryPoint = "GetForegroundWindow")]
        private unsafe static extern IntPtr GetForegroundWindow();
        #endregion

        [StructLayout(LayoutKind.Sequential)]
        public unsafe struct CM_VOICE_RECORDER
        {
            public int cb;
            public wndStyle dwStyle;
            public int xPos;
            public int yPos;
            public IntPtr hwndParent;
            public int id;
            public char* lpszRecordFileName;
        }

        public enum wndStyle : uint
        {
            VRS_NO_OKCANCEL = 0x0001, // No OK/CANCLE displayed
            VRS_NO_NOTIFY = 0x0002, // No parent Notifcation
            VRS_MODAL = 0x0004, // Control is Modal     
            VRS_NO_OK = 0x0008, // No OK displayed
            VRS_NO_RECORD = 0x0010, // No RECORD button displayed
            VRS_PLAY_MODE = 0x0020, // Immediately play supplied file when launched
            VRS_NO_MOVE = 0x0040, // Grip is removed and cannot be moved around by the user
            VRS_RECORD_MODE = 0x0080, // Immediately record when launched
            VRS_STOP_DISMISS = 0x0100 // Dismiss control when stopped
        }

        private unsafe CM_VOICE_RECORDER _VoiceRec;
        private IntPtr _hRecorder;
        private string wavFile = "\\file.wav";

        private IntPtr _Hwnd = (IntPtr)0;

        public IntPtr Hwnd
        {
            get { return _Hwnd; }
            set
            {
                _VoiceRec.hwndParent = value;
                _Hwnd = value;
            }
        }

        public unsafe VoiceRecorder()
        {
            _hRecorder = new IntPtr();
            char[] temp = new char[32];

            this.Hwnd = GetForegroundWindow();

            Buffer.BlockCopy(wavFile.ToCharArray(), 0, temp, 0, 2 * wavFile.Length);

            fixed (char* lpszFileName = temp)
            {
                _VoiceRec = new CM_VOICE_RECORDER();

                _VoiceRec.hwndParent = _Hwnd;
                _VoiceRec.dwStyle = wndStyle.VRS_NO_MOVE | wndStyle.VRS_RECORD_MODE;
                _VoiceRec.cb = (int)Marshal.SizeOf(_VoiceRec);
                _VoiceRec.xPos = -1;
                _VoiceRec.yPos = -1;
                _VoiceRec.lpszRecordFileName = lpszFileName;

            }
        }

        public unsafe void Show()
        {
            fixed (CM_VOICE_RECORDER* _VoiceRecPtr = &_VoiceRec)
            {
                _hRecorder = VoiceRecorder_Create(_VoiceRecPtr);
            }
        }
    }
}