为什么在使用播放器时未关闭此简单的移动表单 [英] Why is this simple Mobile Form not closed when using the player

问题描述

我用关闭按钮创建了这个简单的示例表单.

I created this simple sample Form with the close button.

当不使用Interop.WMPLib.dll时，一切都按预期工作

Everything is working as expected when NOT using the Interop.WMPLib.dll

我已经看到其他应用程序使用它没有问题，但是为什么我添加行时Form进程没有关闭:

I've seen other applications using this without problems but why isn't the Form process closed when I just add the line:

SoundPlayer myPlayer = new SoundPlayer();

当然要处理它:

if (myPlayer != null)
            {
                myPlayer.Dispose();
                myPlayer = null;
            }

窗体关闭，但调试器VS2008仍处于活动状态. Form项目和dll仍处于活动状态.

The Form closes but the debugger VS2008 is still active. The Form project and the dll are still active.

如果您给我发送电子邮件到[e-mail]，我可以给您发送压缩的项目.

If you send me an email to [e-mail], I can send you the zipped project.

以下是dll的类:

使用系统； 使用System.Collections.Generic; 使用System.Text; 使用System.Threading; 使用System.Runtime.InteropServices; 使用WMPLib;

using System; using System.Collections.Generic; using System.Text; using System.Threading; using System.Runtime.InteropServices; using WMPLib;

命名空间WindowsMo​​bile.Utilities { 公共委托void SoundPlayerStateChanged(SoundPlayer sender，SoundPlayerState newState);

namespace WindowsMobile.Utilities { public delegate void SoundPlayerStateChanged(SoundPlayer sender, SoundPlayerState newState);

public enum SoundPlayerState
{
    Stopped,
    Playing,
    Paused,
}


public class SoundPlayer : IDisposable
{
    [DllImport("coredll")]
    public extern static int waveOutSetVolume(int hwo, uint dwVolume);

    [DllImport("coredll")]
    public extern static int waveOutGetVolume(int hwo, out uint dwVolume);

    WindowsMediaPlayer myPlayer = new WindowsMediaPlayer();

    public SoundPlayer()
    {
        myPlayer.uiMode = "invisible";
        myPlayer.settings.volume = 100;
    }

    string mySoundLocation = string.Empty;

    public string SoundLocation
    {
        get { return mySoundLocation; }
        set { mySoundLocation = value; }
    }

    public void Pause()
    {
        myPlayer.controls.pause();
    }

    public void PlayLooping()
    {
        Stop();
        myPlayer.URL = mySoundLocation;
        myPlayer.settings.setMode("loop", true);
    }

    public int Volume
    {
        get { return myPlayer.settings.volume; }
        set { myPlayer.settings.volume = value; }
    }

    public void Play()
    {
        Stop();
        myPlayer.URL = mySoundLocation;
        myPlayer.controls.play();
    }

    public void Stop()
    {
        myPlayer.controls.stop();
        myPlayer.close();
    }

    #region IDisposable Members

    public void Dispose()
    {
        try
        {
            Stop();
        }
        catch (Exception)
        {
        }
        // need this otherwise the process won't exit?!
        try
        {
            int ret = Marshal.FinalReleaseComObject(myPlayer);
        }
        catch (Exception)
        {
        }
        myPlayer = null;
        GC.Collect();
    }

    #endregion
}
}

推荐答案

一个MessageBox或更低版本解决了它.谢谢.

A MessageBox or Below solved it. Thx.

public void Dispose()
    {
        try
        {
            Stop();
        }
        catch (Exception)
        {
        }
        // need this otherwise the process won't exit?!
        try
        {
            int ret = Marshal.FinalReleaseComObject(myPlayer);
        }
        catch (Exception)
        {
        }
        myPlayer = null;
        GC.Collect();

        //If you don't do this, it will not quit
        //http://www.eggheadcafe.com/software/aspnet/31363254/media-player-freezing-app.aspx
        for (int s = 0; s < 100; s++)
        {
            Application.DoEvents();
            Thread.Sleep(1);
        }
        GC.WaitForPendingFinalizers();

        //MessageBox.Show("Application Exiting");
    }

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