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This object is used to send roSequenceMatchEvent events when the specified byte sequence patterns are matched. Once a pattern has been matched and the event has been posted, all contributing bytes are discarded. As a result, if one pattern is a prefix of another pattern, then the second, longer pattern will never be matched by the object.
This object provides both a standard interface and an overloaded interface for sending events to a message port.
ifMessagePort
SetPort(port As roMessagePort)
Posts messages of type roSequenceMatchEvent to the attached message port.
ifSequenceMatcher
SetPort(a As Object)
Specifies the message port where roSequenceMatchEvent objects will be posted.
Add(pattern As Object, user_data As Object) As Boolean
Adds a pattern to be matched by the roSequenceMatcher object instance. The pattern should be specified as an object that is convertible to a byte sequence (e.g. roByteArray, roString). For the user data, pass the object that should be returned if the specified pattern is matched.
Example
| Code Block |
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Function FromHex(hex as String) as Object
bytes = CreateObject("roByteArray")
bytes.FromHexString(hex)
return bytes
End Function
Sub Main()
serial = CreateObject("roSerialPort", 1, 115200)
mp = CreateObject("roMessagePort")
button1_seq = FromHex("080a01040001e000")
button2_seq = FromHex("080e01040001e000")
matcher = CreateObject("roSequenceMatcher")
matcher.SetMessagePort(mp)
matcher.Add(button1_seq, { name: "button1" })
matcher.Add(button2_seq, { name: "button2" })
matcher.Add("flibbet", { name: "flibbet" })
matcher.Add("flobbet", { name: "flobbet" })
if not serial.SetMatcher(matcher) then
stop
end if
finished = false
while not finished
ev = mp.WaitMessage(10000)
if ev = invalid then
finished = true
else if type(ev) = "roSequenceMatchEvent" then
print "Got button: "; ev.GetUserData().name
else
print "Unexpected event: "; type(ev)
end if
end while
End Sub |
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