vlc的应用之三：动态调用vlc-0.9.4的libvlc.dll 标签：
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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_media_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_media_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, refExceptionStruct 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_media_player_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_media_player_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, refExceptionStruct 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：
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 lbp0200、xc_shen、jiang421122 | 8人 | 了这篇文章 |
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