所属类别：开发技术

文章作者：jeremiah

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版权声明：原创作品，允许转载，转载时请务必以超链接形式标明文章 原始出处 、作者信息和本声明。否则将追究法律责任。http://jeremiah.blog.51cto.com/539865/116981 vlc-0.9.4提供的libvlc.dll是可以动态调用的，Jeremiah这一篇博客就介绍下如何用C#和WinForm框架调用libvlc.dll作个简易播放器。1. vs2005新建工程，将vlc-0.9.4的libvlc.dll，libvlccore.dll，plugins目录全部拷贝到工程目录下面\bin\Debug中。 2. 创建异常结构体using System;using System.Collections.Generic;using System.Text;namespace MyOwnPlayer{//异常结构体public struct exceptionStruct{private int raised;private int code;private string message;}class MediaException{}} 3. CoreHandle和Core类using System; using System.Runtime.InteropServices;

namespace MyOwnPlayer { class CoreHandle : SafeHandle { //构造方法 public CoreHandle() : base(IntPtr.Zero, true) { }

//重写的方法 public override bool IsInvalid { get { return handle == IntPtr.Zero; } }

protected override bool ReleaseHandle() { if (!IsInvalid) { libvlc_release(this); handle = IntPtr.Zero; } return true; }

protected override void Dispose(bool disposing) { ReleaseHandle(); base.Dispose(disposing); }

//Dll动态导入 [DllImport("libvlc")] private static extern void libvlc_release(CoreHandle coreHandle); } }using System; using System.Runtime.InteropServices;

namespace MyOwnPlayer { class Core { //coreHandle字段和属性 private CoreHandle coreHandle; public CoreHandle CoreHandle { get { return coreHandle; } } //构造方法 public Core(string[] argv, ref ExceptionStruct ex) { coreHandle = libvlc_new(argv.Length, argv, ref ex); }

//Dll动态导入 [DllImport("libvlc")] private static extern CoreHandle libvlc_new(int argc, string[] args, ref ExceptionStruct ex); } } 3. MediaHandle和Media类，注意里面的非英文路径处理方法。using System; using System.Runtime.InteropServices;

namespace MyOwnPlayer { class MediaHandle : SafeHandle { //构造方法 public MediaHandle() : base(IntPtr.Zero, true) { }

//重写的方法 public override bool IsInvalid { get { return handle == IntPtr.Zero; } }

protected override bool ReleaseHandle() { if (!IsInvalid) { libvlc_release(this); handle = IntPtr.Zero; } return true; }

protected override void Dispose(bool disposing) { ReleaseHandle(); base.Dispose(disposing); }

//Dll动态导入 [DllImport("libvlc")] private static extern void libvlc_release(MediaHandle mediaHandle); } }using System;using System.Text;using System.Runtime.InteropServices;namespace MyOwnPlayer{class Media{//mediaHandle字段和属性private MediaHandle mediaHandle;public MediaHandle MediaHandle{get { return mediaHandle; }}//构造方法public Media(CoreHandle coreHandle, String filename, ref ExceptionStruct ex){//c#为UTF-16编码, libvlc.dll为UTF-8编码, 需要转换.UTF8Encoding utf8 = new UTF8Encoding();mediaHandle = libvlc_media_new(coreHandle, utf8.GetBytes(filename), ref ex);}//Dll动态导入[DllImport("libvlc")]private static extern MediaHandle libvlc_media_new(CoreHandle coreHandle, [MarshalAs(UnmanagedType.LPArray)] byte[] link, ref ExceptionStruct ex);}} 5. MediaPlayerHandle和MediaPlayer类using System; using System.Runtime.InteropServices;

namespace MyOwnPlayer { class MediaPlayerHandle : SafeHandle { //构造方法 public MediaPlayerHandle() : base(IntPtr.Zero, true) { }

//重写的方法 public override bool IsInvalid { get { return handle == IntPtr.Zero; } }

protected override bool ReleaseHandle() { if (!IsInvalid) { libvlc_release(this); handle = IntPtr.Zero; } return true; }

protected override void Dispose(bool disposing) { ReleaseHandle(); base.Dispose(disposing); }

//Dll动态导入 [DllImport("libvlc")] private static extern void libvlc_release(MediaPlayerHandle mediaPlayerHandle); } }using System; using System.Runtime.InteropServices;

namespace MyOwnPlayer { class MediaPlayer { //mediaPlayerHandle字段和属性 private MediaPlayerHandle mediaPlayerHandle; public MediaPlayerHandle MediaPlayerHandle { get { return mediaPlayerHandle; } }

//构造方法 public MediaPlayer(MediaHandle mediaHandle, ref ExceptionStruct ex) { mediaPlayerHandle = libvlc_media_player_new_from_media(mediaHandle, ref ex); }

//设置父窗口 public void VedioSetParent(CoreHandle coreHandle, IntPtr hDT, ref ExceptionStruct ex) { libvlc_video_set_parent(coreHandle, hDT, ref ex); }

//播放 public void Play(ref ExceptionStruct ex) { libvlc_media_player_play(mediaPlayerHandle, ref ex); }

//停止 public void Stop(ref ExceptionStruct ex) { libvlc_media_player_stop(mediaPlayerHandle, ref ex); }

//Dll动态导入 [DllImport("libvlc")] private static extern MediaPlayerHandle libvlc_media_player_new_from_media(MediaHandle libvlc_media_handle, ref ExceptionStruct ex);

[DllImport("libvlc")] private static extern void libvlc_video_set_parent(CoreHandle coreHandle, IntPtr hDT, ref ExceptionStruct ex);

[DllImport("libvlc")] private static extern void libvlc_media_player_play(MediaPlayerHandle mediaPlayerHandle, ref ExceptionStruct ex);

[DllImport("libvlc")] private static extern void libvlc_media_player_stop(MediaPlayerHandle mediaPlayerHandle, ref ExceptionStruct ex); } } 6. 基本工作做好了。下一步建立一个Form，里面画一个Panel(播放容器)，画一个Textbox(播放地址)，画一个Button(播放按钮)，Button的点击事件为：private void button1_Click(object sender, EventArgs e) { //要播放的文件的uri string uri = this.textBox1.Text; //进行播放的控件的句柄 IntPtr hdl = this.panel1.Handle; //播放参数 string[] argv = new string[] { "-I", "--ignore-config" }; //vlc对象的创建 ExceptionStruct ex = new ExceptionStruct(); Core core = new Core(argv, ref ex); Media media = new Media(core.CoreHandle, uri, ref ex); MediaPlayer player = new MediaPlayer(media.MediaHandle, ref ex); //垃圾回收 GC.Collect(); //播放 player.VedioSetParent(core.CoreHandle, hdl, ref ex); player.Play(ref ex); //继续回收垃圾等相关操作 GC.Collect(); GC.WaitForPendingFinalizers(); } 7. 基本的播放功能就是这样实现的。其他接口请参考源码下面的\include\vlc\libvlc.h文件，里面有比较详细的对外接口的说明。 8. 以上代码已经发送到附件中(MyOwnPlayer.rar)，参考网址的楼主写的代码也在附件中(Marx_libvlc_wrapper(2).zip)。调试附件请注意第1步。参考网址：1. http://forum.videolan.org/viewtopic.php?f=14&t=47385&st=0&sk=t&sd=a&hilit=C%23+wrapper本文出自 “Jeremiah的程序乐园” 博客，请务必保留此出处http://jeremiah.blog.51cto.com/539865/116981本文出自 51CTO.COM技术博客

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