Brightsign Object Reference Manual (FW 5.1) Uživatelský manuál stáhnout pdf (Strana 271)

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c.Scan(desc)

Asynchronous API

• AsyncScan(parameters As roAssociativeArray) As Boolean: Begins a channel scan on the RF input

and returns the results immediately. Otherwise, the behavior and parameters of this method are identical

to Scan(). When completed or cancelled, AsyncScan() generates an roChannelManagerEvent, which supports

ifUserData and outputs two types of event:

o 0 – Scan Complete: Generated upon the completion of a scan. No extra data is supplied.

o 1 – Scan Progress: Generated upon every tune that is performed during the scan. GetData() returns the

percentage complete of the scan.

• CancelScan() As Boolean: Cancels any asynchronous scans that are currently running. This method does

not generate an roChannelManagerEvent.

Synchronous Example

c = CreateObject("roChannelManager")

' Scan the channels

aa = CreateObject("roAssociativeArray")

aa["ChannelMap"] = "ATSC"

aa["FirstRfChannel"] = 12

aa["LastRfChannel"] = 50

c.Scan(aa)

' Start at the first channel

index = 0

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