ClearKeyAsTrigger

Availability All terminals
Description This function makes it possible to use the small clear key as an additional trigger key to enable the scanner and read barcodes.
Syntax void ClearKeyAsTrigger( int enabled );
Arguments
int enabled

enabled can have the following values:
TRUE The clear key operates as a trigger key in regards to reading barcodes.
FALSE The clear key can't be used as trigger key to read barcodes.
-1 Returns the current value of enabled.
Returns Returns the new/current value of enabled.
Remarks By default the clear key does not behave like a trigger key in regards to reading barcodes.
Example 
// This program reads barcodes by both the trigger key and the small clear key. 
// After each successful decode it shows a good read LED and makes a buzzer sound.

#include <stdio.h>
#include "lib.h"

void main( void )
{
    int ch;
    char bcr_buf[42] = {0};
    struct barcode code = {0};

    static int last_key_pressed = -1;    // Used to determine whether a barcode was read using the clear key or trigger key

    code.min   = 3;
    code.max   = 41;
    code.text  = bcr_buf;

    ClearKeyAsTrigger(TRUE);              // This function makes it possible to use the small clear key 
                                          // as additional trigger key to enable the scanner and read barcodes. 

    ScannerPower(SINGLE|TRIGGER, 250);    // Single read / Trigger mode / 5 seconds

    for(;;)
    {
        if( (ch=getchar()) > 0 )
            last_key_pressed = ch;        // Used to determine whether a barcode was read using the clear key or trigger key

        if(ReadBarcode(&code) == OK)
        {
            if(last_key_pressed == TRIGGER_KEY)
                GoodReadLed(GREEN, 10);
            else
                GoodReadLed(ORANGE, 10);

            Sound( TSTANDARD, VHIGH, SMEDIUM, SHIGH, 0);
            printf("%*s\r", code.length, code.text);
        }

        Idle();
    }
}