Functions and Directives

Function Tone() Foundation

Produces a speaker tone with specific tone frequency and duration.

Syntax
Tone( <nFrequency>, [<nDuration>] ) --> NIL
Parameters
<nFrequency>
<nFrequency> is a positive numeric expression which indicates the frequency of the tone produced.
<nDuration>
The optional numeric argument <nDuration> specifies the duration of the tone in 2/18 second increments. The value 9 for <nDuration>produces a tone for a duration of one second.
Return

The return value of Tone() is always NIL.

Description

The environment function Tone() produces a tone signal to alert the user to a specific program condition. Common program conditions for which tone signals are useful are reaching the start or end of a file, termination of a timed procedure or when the user has selected a control element not available at that time.

The ASCII character 7 (Chr(7)) can also be used for outputting a warning tone. When it is displayed with QOut() or ? , a warning tone sounds instead of a visible display.

Examples
Tone()
// The example shows various UDFs which can signal 
// specific program condition 

PROCEDURE Main 

   BofTone() 
   EofTone() 
   ErrorTone() 
   DoneTone() 

RETURN 

PROCEDURE BofTone() 
   Tone(800) 
RETURN 

PROCEDURE EofTone() 
   Tone(500) 
RETURN 

PROCEDURE ErrorTone() 
   Tone(1000,3) 
RETURN 

PROCEDURE DoneTone() 
   Tone(100,3) 
   Tone(200,3) 
   Tone(300,3) 
   Tone(500,6) 
RETURN 
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