How to play alert sound only once | Forex Factory

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How to play alert sound only once

  • #1
  • First Post: Jul 5, 2016 5:31am Jul 5, 2016 5:31am
I have some indicators where an arrow gets painted on the chart when criteria I specify occurs. Instead of just staring at MT4 all day long, I'd like an alert to play once the arrow gets drawn so I can do other work on my PC. BUT, I only want the alert to play just once! How can I make this so?

The basic code I used in my indicators to play the alert is:

Inserted Code
PlaySound("Alert.wav");


Thanks.
  • #2
  • Jul 5, 2016 5:54am Jul 5, 2016 5:54am
Quoting Rm2
I have some indicators where an arrow gets painted on the chart when criteria I specify occurs. Instead of just staring at MT4 all day long, I'd like an alert to play once the arrow gets drawn so I can do other work on my PC. BUT, I only want the alert to play just once! How can I make this so? The basic code I used in my indicators to play the alert is: PlaySound("Alert.wav"); Thanks.

the default Alert.wav is too short duration and often missed.

use a music wav file of several seconds, example 30 seconds.

// play music wav file
extern bool PlaySounds = true; //...false;
// wave file to be played
extern string AlertSound = "music.wav";

if(PlaySounds)PlaySound(AlertSound);

*** create a wav file from a favourite music piece and name that music.wav
Honesty is a very expensive gift. You wont find it in cheap people.WBuffett
  • #3
  • Jul 5, 2016 6:10am Jul 5, 2016 6:10am
Quoting emmanuel7788
{quote} the default Alert.wav is too short duration and often missed. use a music wav file of several seconds, example 30 seconds. // play music wav file extern bool PlaySounds = true; //...false; // wave file to be played extern string AlertSound = "music.wav"; if(PlaySounds)PlaySound(AlertSound); *** create a wav file from a favourite music piece and name that music.wav
Thanks but my question is more about how to stop the alert getting played repeatedly.
  • #4
  • Last Post: Jul 5, 2016 7:05am Jul 5, 2016 7:05am
It depends on how your alert is getting triggered, but a couple of common ways to deal with this problem are:

1. Check for change of state.
Use a static variable to remember whether the previous run through OnCalculate() / OnTimer() resulted in an alert.
If it did, don't alert again.
If it didn't, and this time has resulted in an alert, then play the sound.
Inserted Code
   static bool OldState = false;
   bool NewState = (Close[1] > Close[2]); // change for your logic
   if(!OldState && NewState) { PlaySound("Alert.wav"); }
   OldState = NewState;

2. Add a time delay between alerts
Remember when the alert last triggered, add a time delay to this (in seconds), then check that TimeCurrent() is greater than this time before playing the alert again.
Inserted Code
static datetime LastAlert=0;
if(Close[1] > Close[2] && TimeCurrent() > LastAlert + 300) // Change for your logic
  {
   PlaySound("Alert.wav");
   LastAlert = TimeCurrent();
  }

Or, you can use a combination of them both (when price is dancing around the threshold of your alert).

Or, just check once per bar.

Hope that helps
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