blocks|key|664963|text|更新：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|664964|感谢@Engineero指出，Play声音文件vi实际上没有阻塞。更新后的代码显示了如何播放重叠的声音。我将把它留给用户添加停止声音上的键上的代码。不需要超时，因为事件结构中没有发生任何事情。|664965|另外，请注意，对我来说，播放声音vi需要在一个时间循环，以继续播放。不知道为什么需要这样做，但是NI示例以这种方式设置了它(\示例\图形和声音\声音\+Player.vi)。|664966|最后，如果您的声卡如前面提到的这里那样不堪重负，您可能会使vi崩溃。如果发生这种情况，我将使用一个更好的声音库来尝试从您的声卡中挤出更多的性能。|offset|length|664967|​|664968|📷|atomic|664969|664970|原件：|664971|首先，我假设您是指这个Launchpad|664972|我能够一次按多达4个键，如下所示-重要的是将事件超时设置为1ms。如果你需要更多，它将需要一个更复杂的设计。|664973|我无法轻松地实现声音，因为所有基本的LabVIEW嗡嗡声都被认为是“阻塞I/O”，这意味着如果你同时调用2声，而不是同时播放一个又一个。您需要使用非阻塞I/O实现您的仪表注释，可能是使用LabVIEW以外的一种语言，比如这个C%2B%2B库。|664974|664975|664976|664977|entityMap|0|LINK|mutability|MUTABLE|url|http://forums.ni.com/t5/LabVIEW/lvsound2-dll-continuous-sound-input-read-vi-hanging-issue/td-p/1772376|1|IMAGE|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/6e85dce59a84c8f166ae283257976133.png|imageAlt|2|http://global.novationmusic.com/launch/launchpad#|3|https://en.wikipedia.org/wiki/Asynchronous_I/O|4|https://ccrma.stanford.edu/software/stk/|5|https://developer.qcloudimg.com/http-save/yehe-900000/4adb8f646b36b798d71a1a81a10d6e34.png^0|0|0|0|F|2|0|0|0|0|1|1|0|0|0|9|B|2|0|0|21|6|3|34|4|4|0|0|0|1|5|0|0^^$0|@$1|2|3|4|5|6|7|1M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1O|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|1P|8|@]|9|@$H|1Q|I|1R|1|1S]]|A|$]]|$1|J|3|K|5|6|7|1T|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|1U|8|@]|9|@$H|1V|I|1W|1|1X]]|A|$]]|$1|O|3|K|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|20|8|@]|9|@$H|21|I|22|1|23]]|A|$]]|$1|T|3|U|5|6|7|24|8|@]|9|@]|A|$]]|$1|V|3|W|5|6|7|25|8|@]|9|@$H|26|I|27|1|28]|$H|29|I|2A|1|2B]]|A|$]]|$1|X|3|K|5|6|7|2C|8|@]|9|@]|A|$]]|$1|Y|3|M|5|N|7|2D|8|@]|9|@$H|2E|I|2F|1|2G]]|A|$]]|$1|Z|3|K|5|6|7|2H|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|2I|8|@]|9|@]|A|$]]]|11|$12|$5|13|14|15|A|$16|17]]|18|$5|19|14|1A|A|$1B|1C|1D|-4]]|1E|$5|13|14|15|A|$16|1F]]|1G|$5|13|14|15|A|$16|1H]]|1I|$5|13|14|15|A|$16|1J]]|1K|$5|19|14|1A|A|$1B|1L|1D|-4]]]]

<h2>Update:</h2>

Thanks to @Engineero for pointing out that Play Sound File vi actually isn't blocking. The updated code shows how to play overlapping sounds. I'll leave it to the user to add the Stop Sound on Key Up code. No timeout is needed because nothing is taking place in the event structure.

Also, note that for me the Play Sound vi needed to be in a while loop to keep playing. Not sure why this is needed, but the NI examples sets it up this way (\examples\Graphics and Sound\Sound\Sound Player.vi).

Finally, you may crash the vi if your sound card gets overwhelmed as mentioned <a href="http://forums.ni.com/t5/LabVIEW/lvsound2-dll-continuous-sound-input-read-vi-hanging-issue/td-p/1772376" rel="nofollow noreferrer">here</a>. If that happens I would go with a better sound library to try and squeeze more performance out of your sound card.

<a href="https://i.stack.imgur.com/Ax3qp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Ax3qp.png" alt="enter image description here"></a>

<h2>Original:</h2>

First, I assume you a referring to <a href="http://global.novationmusic.com/launch/launchpad#" rel="nofollow noreferrer">this Launchpad</a>?

I was able to press up to 4 keys at once will the following - the important thing is to set the event timeout to 1 ms. If you need more than that it will require a more sophisticated design.

I was no able to easily implement a sound because all the basic LabVIEW beeps are what's considered "blocking I/O" meaning if you call 2 Beeps simultaneously than Windows will play one after another not both at the same time. You will need to implement you instrument notes using <a href="https://en.wikipedia.org/wiki/Asynchronous_I/O" rel="nofollow noreferrer">non blocking I/O</a> probably in a language other than LabVIEW such as this <a href="https://ccrma.stanford.edu/software/stk/" rel="nofollow noreferrer">C++ library</a>.

<a href="https://i.stack.imgur.com/QtwlY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QtwlY.png" alt="enter image description here"></a>

blocks|key|1816884|text|工作溶液|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1816885|我想我使用Play+Sound+File+VI在Graphics+and+Sound+->+Sound+->+Output调色板下比我预期的要容易得多。这个链接是2011年的文档(找不到最近的链接)，但看起来并没有改变。工作结果如下所示，事件结构处理两个不同的事件：|offset|length|style|CODE|1816886|Key+Down?事件：|1816887|​|1816888|📷|atomic|1816889|1816890|Stop+Button事件：|1816891|1816892|1816893|1816894|如果不使用主事件循环右侧的Sound+Output+Clear+VI，您可能会很好，但是在那里使用它不会有什么影响。|1816895|事实证明，Play+Sound+File+VI不阻塞，所以您可以播放多个重叠的声音文件。如果您遇到机器上的阻塞(一个声音文件播放，然后是下一个声音文件，等等)，请告诉我，因为我有另一个可能有效的解决方案。|1816896|关于事件的一句话|1816897|需要理解的一件重要事情是，事件是在队列中处理的。当您按下键时，按下这些键就会按到事件队列上。每次执行事件处理循环时，它都会将最老的事件从队列中取出并处理。LabVIEW中的事件结构将只处理事件处理循环的每次迭代中的一个事件。在下一次迭代中，如果您的结构设置为处理的队列中仍然存在事件，则将对该迭代和重复使用下一个最旧的事件。|1816898|现在，假设您想做一些非常复杂的处理，每次按一个键需要10秒，然后将这个处理放在主事件循环中。您的按键仍然以按下它们的速度进入事件队列，但是LabVIEW必须等待整整10秒才能对下一个键按下一个键并对其进行处理，因此您最终得到的应用程序似乎挂在队列中，而它在队列中的速度比向队列中添加项的速度要慢得多。|1816899|解决这个问题的一种方法是将复杂的处理放到另一个进程的队列之外。如果您有这些资源，您实际上可以在它自己的线程中为每一个按键调用一个处理子VI的单独实例。这允许事件处理循环尽可能快地生成进程，然后您的进程会占用它们需要的任何时间(资源允许)执行您想要的任何操作。|1816900|本质上，这就是Play+Sound+File+VI正在做的事情。它看到您想要播放一个文件，并生成一个在扬声器上播放该声音的进程，允许事件处理循环立即继续，而不是等待声音播放完毕。当你按下更多的键时，会产生更多的进程，当它们完成时，它们会杀死自己。您也可以手动完成此操作，这是我为您提供的另一种解决方案，如果Play+Sound+File对您的行为不像对我这样做的话。|1816901|entityMap|0|LINK|mutability|MUTABLE|url|http://zone.ni.com/reference/en-XX/help/371361H-01/lvpict/playsoundfile/|1|IMAGE|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/0aab009054ebeef51354b1ec97cc8b52.png|imageAlt|2|https://developer.qcloudimg.com/http-save/yehe-900000/987b163bed510841acaec69d0ac30b93.png^0|0|5|F|O|11|5|F|0|0|0|9|0|0|0|1|1|0|0|0|B|0|0|0|1|2|0|0|D|I|0|5|F|0|0|0|0|0|7|F|49|F|0^^$0|@$1|2|3|4|5|6|7|1O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1P|8|@$D|1Q|E|1R|F|G]|$D|1S|E|1T|F|G]]|9|@$D|1U|E|1V|1|1W]]|A|$]]|$1|H|3|I|5|6|7|1X|8|@$D|1Y|E|1Z|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|20|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|21|8|@]|9|@$D|22|E|23|1|24]]|A|$]]|$1|O|3|K|5|6|7|25|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|26|8|@$D|27|E|28|F|G]]|9|@]|A|$]]|$1|R|3|K|5|6|7|29|8|@]|9|@]|A|$]]|$1|S|3|M|5|N|7|2A|8|@]|9|@$D|2B|E|2C|1|2D]]|A|$]]|$1|T|3|K|5|6|7|2E|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|2F|8|@$D|2G|E|2H|F|G]]|9|@]|A|$]]|$1|W|3|X|5|6|7|2I|8|@$D|2J|E|2K|F|G]]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|2L|8|@]|9|@]|A|$]]|$1|10|3|11|5|6|7|2M|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|2N|8|@]|9|@]|A|$]]|$1|14|3|15|5|6|7|2O|8|@]|9|@]|A|$]]|$1|16|3|17|5|6|7|2P|8|@$D|2Q|E|2R|F|G]|$D|2S|E|2T|F|G]]|9|@]|A|$]]|$1|18|3|-4|5|6|7|2U|8|@]|9|@]|A|$]]]|19|$1A|$5|1B|1C|1D|A|$1E|1F]]|1G|$5|1H|1C|1I|A|$1J|1K|1L|-4]]|1M|$5|1H|1C|1I|A|$1J|1N|1L|-4]]]]

<h2>Working Solution</h2>
I think I got this working much more easily than I expected using the <a href="http://zone.ni.com/reference/en-XX/help/371361H-01/lvpict/playsoundfile/" rel="nofollow noreferrer"><code>Play Sound File</code></a> VI under the <code>Graphics and Sound -&gt; Sound -&gt; Output</code> palette. That link is the 2011 documentation (couldn't find a more recent link), but it does not look like it has changed. The working result is shown below, with two different events handled by the event structure:
<code>Key Down?</code> event:
<img src="https://i.stack.imgur.com/IlDiV.png" alt="enter image description here" />
<code>Stop Button</code> event:
<img src="https://i.stack.imgur.com/T00lu.png" alt="enter image description here" />
You may be fine without using the <code>Sound Output Clear</code> VI to the right of the main event loop, but having it there won't hurt.
It turns out that the <code>Play Sound File</code> VI does not block, so you can play multiple overlapping sound files. If you run into blocking on your machine (one sound file plays, then the next, and so on), let me know because I have another solution that might work.
<h2>A word on events</h2>
An important thing to understand is that events are handled in a queue. When you press keys, those key presses go in order onto the event queue. Each time your event-handling loop executes, it takes the oldest event out of that queue and processes it. The event structure in LabVIEW will only handle one event per iteration of your event-handling loop. On the next iteration, if events are still in the queue that your structure is set up to process, it will take the next-oldest one for that iteration and repeat.
Now, lets say that you want to do some super complicated processing that takes 10 seconds every time you press a key, and you put that processing inside of your main event loop. Your key presses still go onto the event queue as fast as you press them, but LabVIEW has to wait the full 10 seconds before it can dequeue the next keypress and process it, so you end up with an application that seems to hang while it chugs through the queue much slower than you are adding items to the queue.
One way to get around this is to take that complicated processing and put it outside of the queue in another process. If you have the resources, you can actually call a separate instance of a processing sub-VI in its own thread for every one of those key presses. This allows the event handling loop to spawn processes as fast as you can press keys, and then your processes take whatever time they need to simultaneously (resources permitting) perform whatever actions you wanted.
Essentially that is what the <code>Play Sound File</code> VI is doing. It sees that you want to play a file and spawns a process to play that sound over the speakers, allowing the event-handling loop to continue immediately rather than waiting for the sound to finish playing. As you press more keys, more processes get spawn that kill themselves when they are finished. You can do this manually too, which is the other solution that I have for you if <code>Play Sound File</code> does not behave the same way for you as it did for me.

I'm using event structure and want to do some like Launchpad.
Numeric keyboard have for each number added a sound.
Problem is, that when I press number example one, the program is waiting when the music stop play and next I can press example number four. 

Is it possible, to play sounds from 3 key's at the same time using event structure ? 

<a href="http://www.filedropper.com/dziala" rel="nofollow noreferrer">I put the files online here</a> and added screenshots below. Block diagram:

<img src="https://i.stack.imgur.com/zhyZW.jpg" alt="block diagram">

Front panel:

<img src="https://i.stack.imgur.com/FeOIy.jpg" alt="front panel">

LabView playing more than one sound at the time

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我使用事件结构，并想做一些像Launchpad。数字键盘为每个数字添加了一个声音。问题是，当我按第一个例子时，当音乐停止播放的时候，程序在等待，接下来我可以按第四个例子。是否可以使用事件结构同时播放3键的声音？，并在下面添加了截图。方框图：​​前面板：​​

问LabView在同一时间播放多个声音
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