C# Windows Media Player Controller

这是之前一个项目用到的内容，整理一下，发布出来。
控制系统的windows media player播放、暂停等等，无论新旧版本，都支持。




using System;
using System.Collections.Generic;
using System.Text;

using System.Runtime.InteropServices;

namespace WMPController
{
    class WMPController
    {
        #region 定义WM_COMMAND消息
        //当用户从菜单中选择一条命令，
        //一个控件向它的父窗口发送通知消息，
        //或者快捷键被按下时，
        //将发送WM_COMMAND消息
        private const int WM_COMMAND = 0x111;//&H,VB表示十六进制；0x,C#表示十六进制
        private const int WMP_PLAY = 0x4978;
        private const int WMP_STOP = 0x4979;
        private const int WMP_PLAY_FAST = 0x4992;
        private const int WMP_PLAY_NORMAL = 0x4993;
        private const int WMP_PLAY_SLOW = 0x4994;
        private const int WMP_PREV = 0x497A;
        private const int WMP_NEXT = 0x497B;
        private const int WMP_FAST_FORWARD = 0x497D;
        private const int WMP_SHUFFLE = 0x499A;
        private const int WMP_REPEAT = 0x499B;
        private const int WMP_VOLUME_UP = 0x497F;
        private const int WMP_VOLUME_DOWN = 0x4980;
        private const int WMP_VOLUME_MUTE = 0x4981;

        private const int WM_GETTEXT = 0x000D;
        #endregion

        #region 定义WM_APPCOMMAND消息
        private const int WM_APPCOMMAND = 0x0319;

        private const int APPCOMMAND_BROWSER_BACKWARD = 1;
        private const int APPCOMMAND_BROWSER_FORWARD = 2;
        private const int APPCOMMAND_BROWSER_REFRESH = 3;
        private const int APPCOMMAND_BROWSER_STOP = 4;
        private const int APPCOMMAND_BROWSER_SEARCH = 5;
        private const int APPCOMMAND_BROWSER_FAVORITES = 6;
        private const int APPCOMMAND_BROWSER_HOME = 7;
        private const int APPCOMMAND_VOLUME_MUTE = 8;
        private const int APPCOMMAND_VOLUME_DOWN = 9;
        private const int APPCOMMAND_VOLUME_UP = 10;
        private const int APPCOMMAND_MEDIA_NEXTTRACK = 11;
        private const int APPCOMMAND_MEDIA_PREVIOUSTRACK = 12;
        private const int APPCOMMAND_MEDIA_STOP = 13;
        private const int APPCOMMAND_MEDIA_PLAY_PAUSE = 14;
        private const int APPCOMMAND_LAUNCH_MAIL = 15;
        private const int APPCOMMAND_LAUNCH_MEDIA_SELECT = 16;
        private const int APPCOMMAND_LAUNCH_APP1 = 17;
        private const int APPCOMMAND_LAUNCH_APP2 = 18;
        private const int APPCOMMAND_BASS_DOWN = 19;
        private const int APPCOMMAND_BASS_BOOST = 20;
        private const int APPCOMMAND_BASS_UP = 21;
        private const int APPCOMMAND_TREBLE_DOWN = 22;
        private const int APPCOMMAND_TREBLE_UP = 23;
        private const int APPCOMMAND_MICROPHONE_VOLUME_MUTE = 24;
        private const int APPCOMMAND_MICROPHONE_VOLUME_DOWN = 25;
        private const int APPCOMMAND_MICROPHONE_VOLUME_UP = 26;
        private const int APPCOMMAND_HELP = 27;
        private const int APPCOMMAND_FIND = 28;
        private const int APPCOMMAND_NEW = 29;
        private const int APPCOMMAND_OPEN = 30;
        private const int APPCOMMAND_CLOSE = 31;
        private const int APPCOMMAND_SAVE = 32;
        private const int APPCOMMAND_PRINT = 33;
        private const int APPCOMMAND_UNDO = 34;
        private const int APPCOMMAND_REDO = 35;
        private const int APPCOMMAND_COPY = 36;
        private const int APPCOMMAND_CUT = 37;
        private const int APPCOMMAND_PASTE = 38;
        private const int APPCOMMAND_REPLY_TO_MAIL = 39;
        private const int APPCOMMAND_FORWARD_MAIL = 40;
        private const int APPCOMMAND_SEND_MAIL = 41;
        private const int APPCOMMAND_SPELL_CHECK = 42;
        private const int APPCOMMAND_DICTATE_OR_COMMAND_CONTROL_TOGGLE = 43;
        private const int APPCOMMAND_MIC_ON_OFF_TOGGLE = 44;
        private const int APPCOMMAND_CORRECTION_LIST = 45;
        private const int APPCOMMAND_MEDIA_PLAY = 46;
        private const int APPCOMMAND_MEDIA_PAUSE = 47;
        private const int APPCOMMAND_MEDIA_RECORD = 48;
        private const int APPCOMMAND_MEDIA_FAST_FORWARD = 49;
        private const int APPCOMMAND_MEDIA_REWIND = 50;
        private const int APPCOMMAND_MEDIA_CHANNEL_UP = 51;
        private const int APPCOMMAND_MEDIA_CHANNEL_DOWN = 52;
        #endregion

        #region 引入FindWindow、SendMessage等windows函数
        //  FindWindow 函数可找到一个类名、窗口名
        //  与指定字符串相匹配的最上层的窗口的句柄
        //  该函数不搜索子窗口.
        //  该函数的搜索过程中不区分大小写.
        [DllImport("User32.dll", EntryPoint = "FindWindow")]
        private static extern int FindWindow(string className, string windowName);

        //  SendMessage 函数给一个或几个窗口发送特定的消息 
        //  特定的窗口通过该函数调用程序段，直到处理消息后返回.
        [DllImport("User32.dll")]
        private static extern int SendMessage(
        int hWnd,               // 目标窗口句柄
        int Msg,                // 消息
        int wParam,             // 消息的前一个附加参数
        int lParam              // 消息的第二个附加参数
        );

        [DllImport("User32.dll")]
        private static extern int SendMessage(
        int hWnd,               // 目标窗口句柄
        int Msg,                // 消息
        int wParam,             // 消息的前一个附加参数
        StringBuilder sb        // 消息的第二个附加参数
        );

        [DllImport("user32.dll")]
        private static extern int GetWindowText(int hWnd, StringBuilder lpString, int nMaxCount);

        [DllImport("user32.dll", EntryPoint = "FindWindow")]
        private static extern int FindWindowEx(int hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);
        #endregion

        private static int WMPGetHandle()
        {
            return FindWindow("WMPlayerApp", "Windows Media Player"); //windows media player
        }

        //暂停
        public static void Pause()
        {
            int playerHandle = WMPGetHandle();
            if (playerHandle != 0)
            {
                SendMessage(playerHandle, WM_APPCOMMAND, 0x00000000, APPCOMMAND_MEDIA_PAUSE << 16);
            }
        }

        //播放
        public static void Play()
        {
            int playerHandle = WMPGetHandle();
            if (playerHandle != 0)
            {
                SendMessage(playerHandle, WM_APPCOMMAND, 0x00000000, APPCOMMAND_MEDIA_PLAY << 16);
            }
        }

        /// <summary>
        /// 还有些命令，自己去添加吧
        /// </summary>
        /// <param name="action"></param>
        public static void ControlWMP(ControlAction action)
        {
            int command = 0;

            switch (action)
            {
                case ControlAction.Next:
                    command = WMP_NEXT;
                    break;

                case ControlAction.PlayPause:       //播放/暂停两个状态的切换
                    command = WMP_PLAY;
                    break;

                case ControlAction.PlayFast:
                    command = WMP_PLAY_FAST;
                    break;

                case ControlAction.Prev:
                    command = WMP_PREV;
                    break;

                case ControlAction.Repeat:          // Repeat
                    command = WMP_REPEAT;
                    break;

                case ControlAction.Shuffle:         // shuffle
                    command = WMP_SHUFFLE;
                    break;

                case ControlAction.Stop:            // stop
                    command = WMP_STOP;
                    break;

                case ControlAction.VolumeDown:      // volume down
                    command = WMP_VOLUME_DOWN;
                    break;

                case ControlAction.VolumeUp:        // volume up
                    command = WMP_VOLUME_UP;
                    break;

                case ControlAction.VolumeMute:      // mute/sound
                    command = WMP_VOLUME_MUTE;
                    break;
            }

            int playerHandle = WMPGetHandle();
            if (playerHandle != 0)
            {
                SendMessage(playerHandle, WM_COMMAND, command, 0);
            }
        }
    }

    public enum ControlAction
    {
        PlayPause,
        Stop,
        VolumeUp,
        VolumeDown,
        VolumeMute,
        Shuffle,
        Repeat,
        Next,
        Prev,
        PlayFast
    }
}