Powershell中Finally语句用法示例
在之前的小技巧中,我们曾经引入过,一个有声的进度条。在PowerShell正在做某项忙碌的任务时,可以一直让它播放某段音乐。代码如下:
#在windows文件夹下面找到要给可用的wav音频文件 $WAVPath=Get-ChildItem-Path$env:windir-Filter*.wav-Recurse-ErrorActionSilentlyContinue| Select-Object-First1-ExpandPropertyFullName #加载并播放 $player=New-ObjectMedia.SoundPlayer$WAVPath $player.PlayLooping() 1..100|ForEach-Object{ Write-Progress-Activity'DoingSomething.Hangin'-Status$_-PercentComplete$_ Start-Sleep-MilliSeconds(Get-Random-Minimum300-Maximum1300) } $player.Stop()
脚本本来运行正常,但是当你终止了它,比如使用ctrl+C来终止,此时脚本运行立马结束。最后一行的$player.Stop()来不及执行,提示声音仍旧在余音绕梁,三日不绝。
解决办法,将最后一句收尾工作的$player.Stop()放在Finally语句中:
#在Windows文件夹找到Wav音频问 $WAVPath=Get-ChildItem-Path$env:windir-Filter*.wav-Recurse-ErrorActionSilentlyContinue| Select-Object-First1-ExpandPropertyFullName #加载并播放 $player=New-ObjectMedia.SoundPlayer$WAVPath try { $player.PlayLooping() 1..100|ForEach-Object{ Write-Progress-Activity'DoingSomething'-Status$_-PercentComplete$_ Start-Sleep-MilliSeconds(Get-Random-Minimum300-Maximum1300) } } finally { $player.Stop() }