开发环境：VS2013， C#， VLC播放器
实现的功能：
1、利用串口通信来控制视频的播放，
2、接收到“1”时播放第一个视频，若10s内没有接收到”1”,自动播放第二个视频，期间忽略接受到的0；
3、若正在播放第二个视频，接收到“1”，立马播放视频1，

整个功能的实现主要就用到了2个控件和1个VLC类，控件SerialPort和timer&&类VlcPlayer.cs
重要提示：项目必须使用.NET 2.0，并且电脑需要安装VLC播放器，然后到安装目录拷贝如图所示文件：我的是VLC2.2.1.0

VlcPlayer.cs类是从网上找的，具体在哪里找的记不清了，代码如下：
以下保证可用：
本人邮箱：liangzuoxiang@126.com
QQ：858010378
有问题欢迎交流。。

using System; using System.Reflection; using System.Runtime.InteropServices; using System.Security; using System.Collections.Generic; using System.Text; namespace serial_audio // **这里把命名空间的名字改成和你项目里的一样就可以了** { class VlcPlayer { private IntPtr libvlc_instance_; private IntPtr libvlc_media_player_; private double duration_; public VlcPlayer(string pluginPath) { string plugin_arg = "--plugin-path=" + pluginPath; string[] arguments = { "-I", "dummy", "--ignore-config", "--no-video-title", plugin_arg }; libvlc_instance_ = LibVlcAPI.libvlc_new(arguments); libvlc_media_player_ = LibVlcAPI.libvlc_media_player_new(libvlc_instance_); } public void SetRenderWindow(int wndHandle) { if (libvlc_instance_ != IntPtr.Zero && wndHandle != 0) { LibVlcAPI.libvlc_media_player_set_hwnd(libvlc_media_player_, wndHandle); } } public void PlayFile(string filePath) { IntPtr libvlc_media = LibVlcAPI.libvlc_media_new_path(libvlc_instance_, filePath); if (libvlc_media != IntPtr.Zero) { LibVlcAPI.libvlc_media_parse(libvlc_media); duration_ = LibVlcAPI.libvlc_media_get_duration(libvlc_media) / 1000.0; LibVlcAPI.libvlc_media_player_set_media(libvlc_media_player_, libvlc_media); LibVlcAPI.libvlc_media_release(libvlc_media); LibVlcAPI.libvlc_media_player_play(libvlc_media_player_); } } public void Pause() { if (libvlc_media_player_ != IntPtr.Zero) { LibVlcAPI.libvlc_media_player_pause(libvlc_media_player_); } } public void Stop() { if (libvlc_media_player_ != IntPtr.Zero) { LibVlcAPI.libvlc_media_player_stop(libvlc_media_player_); } } public double GetPlayTime() { return LibVlcAPI.libvlc_media_player_get_time(libvlc_media_player_) / 1000.0; } public void SetPlayTime(double seekTime) { LibVlcAPI.libvlc_media_player_set_time(libvlc_media_player_, (Int64)(seekTime * 1000)); } public int GetVolume() { return LibVlcAPI.libvlc_audio_get_volume(libvlc_media_player_); } public void SetVolume(int volume) { LibVlcAPI.libvlc_audio_set_volume(libvlc_media_player_, volume); } public void SetFullScreen(bool istrue) { LibVlcAPI.libvlc_set_fullscreen(libvlc_media_player_, istrue ? 1 : 0); } public double Duration() { return duration_; } public string Version() { return LibVlcAPI.libvlc_get_version(); } } internal static class LibVlcAPI { internal struct PointerToArrayOfPointerHelper { [MarshalAs(UnmanagedType.ByValArray, SizeConst = 11)] public IntPtr[] pointers; } public static IntPtr libvlc_new(string[] arguments) { PointerToArrayOfPointerHelper argv = new PointerToArrayOfPointerHelper(); argv.pointers = new IntPtr[11]; for (int i = 0; i < arguments.Length; i++) { argv.pointers[i] = Marshal.StringToHGlobalAnsi(arguments[i]); } IntPtr argvPtr = IntPtr.Zero; try { int size = Marshal.SizeOf(typeof(PointerToArrayOfPointerHelper)); argvPtr = Marshal.AllocHGlobal(size); Marshal.StructureToPtr(argv, argvPtr, false); return libvlc_new(arguments.Length, argvPtr); } finally { for (int i = 0; i < arguments.Length + 1; i++) { if (argv.pointers[i] != IntPtr.Zero) { Marshal.FreeHGlobal(argv.pointers[i]); } } if (argvPtr != IntPtr.Zero) { Marshal.FreeHGlobal(argvPtr); } } } public static IntPtr libvlc_media_new_path(IntPtr libvlc_instance, string path) { IntPtr pMrl = IntPtr.Zero; try { byte[] bytes = Encoding.UTF8.GetBytes(path); pMrl = Marshal.AllocHGlobal(bytes.Length + 1); Marshal.Copy(bytes, 0, pMrl, bytes.Length); Marshal.WriteByte(pMrl, bytes.Length, 0); return libvlc_media_new_path(libvlc_instance, pMrl); } finally { if (pMrl != IntPtr.Zero) { Marshal.FreeHGlobal(pMrl); } } } public static IntPtr libvlc_media_new_location(IntPtr libvlc_instance, string path) { IntPtr pMrl = IntPtr.Zero; try { byte[] bytes = Encoding.UTF8.GetBytes(path); pMrl = Marshal.AllocHGlobal(bytes.Length + 1); Marshal.Copy(bytes, 0, pMrl, bytes.Length); Marshal.WriteByte(pMrl, bytes.Length, 0); return libvlc_media_new_path(libvlc_instance, pMrl); } finally { if (pMrl != IntPtr.Zero) { Marshal.FreeHGlobal(pMrl); } } } // ---------------------------------------------------------------------------------------- // 以下是libvlc.dll导出函数 // 创建一个libvlc实例，它是引用计数的 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] private static extern IntPtr libvlc_new(int argc, IntPtr argv); // 释放libvlc实例 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] public static extern void libvlc_release(IntPtr libvlc_instance); [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] public static extern String libvlc_get_version(); // 从视频来源(例如Url)构建一个libvlc_meida [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] private static extern IntPtr libvlc_media_new_location(IntPtr libvlc_instance, IntPtr path); // 从本地文件路径构建一个libvlc_media [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] private static extern IntPtr libvlc_media_new_path(IntPtr libvlc_instance, IntPtr path); [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] public static extern void libvlc_media_release(IntPtr libvlc_media_inst); // 创建libvlc_media_player(播放核心) [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] public static extern IntPtr libvlc_media_player_new(IntPtr libvlc_instance); // 将视频(libvlc_media)绑定到播放器上 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] public static extern void libvlc_media_player_set_media(IntPtr libvlc_media_player, IntPtr libvlc_media); // 设置图像输出的窗口 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] public static extern void libvlc_media_player_set_hwnd(IntPtr libvlc_mediaplayer, Int32 drawable); [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] public static extern void libvlc_media_player_play(IntPtr libvlc_mediaplayer); [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] public static extern void libvlc_media_player_pause(IntPtr libvlc_mediaplayer); [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] public static extern void libvlc_media_player_stop(IntPtr libvlc_mediaplayer); // 解析视频资源的媒体信息(如时长等) [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] public static extern void libvlc_media_parse(IntPtr libvlc_media); // 返回视频的时长(必须先调用libvlc_media_parse之后，，该函数才会生效) [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] public static extern Int64 libvlc_media_get_duration(IntPtr libvlc_media); // 当前播放的时间 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] public static extern Int64 libvlc_media_player_get_time(IntPtr libvlc_mediaplayer); // 设置播放位置(拖动) [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] public static extern void libvlc_media_player_set_time(IntPtr libvlc_mediaplayer, Int64 time); [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] public static extern void libvlc_media_player_release(IntPtr libvlc_mediaplayer); // 获取和设置音量 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] public static extern int libvlc_audio_get_volume(IntPtr libvlc_media_player); [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] public static extern void libvlc_audio_set_volume(IntPtr libvlc_media_player, int volume); // 设置全屏 [DllImport("libvlc", CallingConvention = CallingConvention.StdCall, ExactSpelling = true)] [SuppressUnmanagedCodeSecurity] public static extern void libvlc_set_fullscreen(IntPtr libvlc_media_player, int isFullScreen); } }