Event Handlers
70
NetLinx Programming Language Reference Guide
Will have the effect you expect button probably for a different reason than you expect. Although the
event will run for both the push and release of all buttons for dvTp, you may also be tempted to think that
you need to make sure the event runs for RELEASE_CHANNEL by adding the following:
Example 5:
DEFINE_EVENT
BUTTON_EVENT[dvTp,PUSH_CHANNEL]
BUTTON_EVENT[dvTp,RELEASE_CHANNEL]
{
PUSH:
Send_String 0,"'Button ',ITOA(BUTTON.INPUT.CHANNEL),' of dvTp was pushed'"
RELEASE:
Send_String 0,"'Button ',ITOA(BUTTON.INPUT.CHANNEL),' of dvTp was released'"
}
However, since both PUSH_CHANNEL and RELEASE_CHANNEL have a value of 0 at compile time, you
are in effect stacking two events that are interpreted as running for any button pushed on the panel and as
a result, the event is run twice every time a button is pushed or released. This may not seem like a big
problem until you try to toggle a variable in the event: since the event runs twice for every button push,
the variable toggles on then toggles off again.
There are some additional parameter "shortcuts" available. In all cases, the following rules apply:
 When a DEV can be used, a DEV array can also be used.
 When a DEVCHAN can be used, a DEVCHAN array can be used.
 When a DEVLEV can be used, a DEVLEV array can be used.
 When a Char, Integer or Long can be used, a Char, Integer or Long array can also be
used.
 You can apply more then 1 of the above rules at a time in a given event handler.
 GET_LAST() can be used to determine which index of an array (any type) caused the event to
fire.
The above rules can let you write some interesting event handler. Let's say you wanted to handle 4
buttons from 6 panels all with one button event. You could write:
Example 6:
DEFINE_DEVICE
dvPanel1 = 128:1:0
dvPanel2 = 129:1:0
dvPanel3 = 130:1:0
dvPanel4 = 131:1:0
dvPanel5 = 132:1:0
dvPanel6 = 133:1:0
DEFINE_VARIABLE
DEV dvMyPanels[] = { dvPanel1, dvPanel2, dvPanel3, dvPanel4, dvPanel5, dvPanel6
}
INTEGER nMyButtons[] = { 4, 3, 2, 1 }
INTEGER nPanelIndex
INTEGER nButtonIndex
DEFINE_EVENT
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