sndplaysound not applying snd_async

[lazer]

Hi, I need to play two sound

Code: Pascal  [Select][+][-]

1.  files one after the other.
2.  
3. SND_SYNC  returns immediately, allowing synchronous execution of the rest of the program. SND_ASYNC presumably does the opposite and returns when finished.
4.  
5. If I do two subsequent calls to sndPlaySound, I only hear the second one.
6.  
7. How should I be using this?  
8.  
9. BTW, I do not want alternative ways to play sounds, I want to get this to work, or know that it is impossible.
10.  
11. TIA.
12.  
13.  

fpc -v
Free Pascal Compiler version 3.3.1 [2022/10/22] for x86_64

[avk]

This just works for me:

Code: Pascal  [Select][+][-]

1.   sndPlaySound(PChar('chimes.wav'), SND_SYNC);
2.   sndPlaySound(PChar('logon.wav'), SND_SYNC);  
3.  

FPC version=3.3.1-11268-g430f1910ed

[lazer]

Thanks,

synchronous means at the same time as

https://www.dictionary.com/browse/synchronous
occurring at the same time; coinciding in time; contemporaneous; simultaneous:

It seems that this is something else Microsoft chose to redefine. For MS this is what async means, sync mean sequential.

thanks for the explanation.

[KodeZwerg]

I really do not know where you take your knowledge from but this is the correct definition

SND_ASYNC   The sound is played asynchronously and PlaySound returns immediately after beginning the sound. To terminate an asynchronously played waveform sound, call PlaySound with pszSound set to NULL.

SND_SYNC   The sound is played synchronously, and PlaySound returns after the sound event completes. This is the default behavior.

https://learn.microsoft.com/en-us/previous-versions//dd743680(v=vs.85)

[VisualLab]

From the description of the sndPlaySound function, which is available on the website:

https://learn.microsoft.com/en-us/previous-versions/dd798676(v=vs.85)

it follows that this is more about the operation of the function itself than about the way the content is reproduced from the sound file. A synchronous call locks the current code until the function executes. Only then is the next instruction (or subroutine) executed. By contrast, an async call is made in the background while the main code continues.

[Fred vS]

@Lazer: If you want to play sound-files at same instant and if you absolutely want to use sndPlaySound, you could create 2 independent threads and in one add sndPlaySound(PChar('sound1.wav'), SND_SYNC) and in the other sndPlaySound(PChar('sound2.wav'), SND_SYNC).

To play the 2 sounds together, just do:

Code: Pascal  [Select][+][-]

1. thread1.execute;
2. thread2.execute;

[lazer]

Thanks Fred. The object is not to play two sounds at the same time but determine whether a sound plays and execution returns immediately after the call to sndPlaySound  (ie execution of the program is synchronous with the sound playing ) or whether it waits until the sound has terminated before returning control to the rest of the code.

The tip on using threads is handy to know about.

[lazer]

I really do not know where you take your knowledge from but this is the correct definition

SND_ASYNC   The sound is played asynchronously and PlaySound returns immediately after beginning the sound. To terminate an asynchronously played waveform sound, call PlaySound with pszSound set to NULL.

SND_SYNC   The sound is played synchronously, and PlaySound returns after the sound event completes. This is the default behavior.

https://learn.microsoft.com/en-us/previous-versions//dd743680(v=vs.85)

Well if you read post you are replying to you would know where I got the definition of the word synchronous and you would have read that I was recognising "correct definition" according to MS and saying that it was another thing they have chosen to redefine.

The sound is played synchronously, and PlaySound returns after the sound event completes.

That is NOT what the word synchronous means, that is called sequential.