MP3 在单独的线程中播放

发布于 2024-10-19 17:28:17 字数 514 浏览 3 评论 0原文

一个问题解决了，另一个问题随之而来：在 C# 程序中，我使用以下方法将标签颜色设置为绿色，然后播放 mp3 文件，最后将颜色设置回黑色。问题是声音似乎是在额外的线程中播放的，因此两种颜色变化之间的时间太短（事实上，在播放文件时它应该具有绿色）。

private void playSound()
    {
        label1.ForeColor = Color.LimeGreen;
        Application.DoEvents();

        WMPLib.WindowsMediaPlayer wmp = new WMPLib.WindowsMediaPlayer();
        wmp.URL = @"C:\examplesound.mp3"; // duration about 30s
        wmp.controls.play();

        label1.ForeColor = Color.Black;
    }

有什么办法可以强制标签在播放 mp3 文件时保持绿色吗？

原文

One problem was solved, another followed: In a C#-program I use following method to set a labels color to green, then playing a mp3-file and finally setting the color back to black.
The problem is that the sound seems to be played in an extra thread, thus the time between the change of the two colors is too short (in fact, it should have the green color while the file is played).

private void playSound()
    {
        label1.ForeColor = Color.LimeGreen;
        Application.DoEvents();

        WMPLib.WindowsMediaPlayer wmp = new WMPLib.WindowsMediaPlayer();
        wmp.URL = @"C:\examplesound.mp3"; // duration about 30s
        wmp.controls.play();

        label1.ForeColor = Color.Black;
    }

Is there anything can be done to force the label to keep the green color whilst the mp3-file is played?

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╭⌒浅淡时光〆 2024-10-26 17:28:17

不要立即将颜色设置回黑色，因为播放是在另一个线程中进行的。

当当前曲目结束时，WMPLib 会发出 PlayStateChange 事件。

因此，添加一个处理程序：

wmp.PlayStateChange += this.Player_PlayStateChange;

private void Player_PlayStateChange(int newState)
{
    if ((WMPLib.WMPPlayState)newState == WMPLib.WMPPlayState.wmppsStopped)
    {
        label1.ForeColor = Color.Black;
    }
}

的页面playState 有一个值列表：

8 - MediaEnded - 媒体项目已完成播放。

您需要确保这是在 UI 线程上完成的。

Don't set the colour back to black straight away as the playback is in another thread.

When the current track ends WMPLib sends out a PlayStateChange event.

So add a handler:

wmp.PlayStateChange += this.Player_PlayStateChange;

private void Player_PlayStateChange(int newState)
{
    if ((WMPLib.WMPPlayState)newState == WMPLib.WMPPlayState.wmppsStopped)
    {
        label1.ForeColor = Color.Black;
    }
}

The page for playState has a list of values: