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(DataFlex) Using IMAP IDLE to Wait for UpdatesThis example demonstrates how to use the IMAP IDLE functionality in Chilkat.
Use ChilkatAx-win32.pkg Procedure Test Handle hoImap Boolean iSuccess String sIdleResultXml String sTemp1 Boolean bTemp1 Get Create (RefClass(cComChilkatImap)) To hoImap If (Not(IsComObjectCreated(hoImap))) Begin Send CreateComObject of hoImap End // .... // .... // .... // Select an IMAP mailbox Get ComSelectMailbox Of hoImap "INBOX" To iSuccess If (iSuccess <> True) Begin Get ComLastErrorText Of hoImap To sTemp1 Showln sTemp1 Procedure_Return End // After a mailbox has been selected, IDLE may begin. // Idling tells the IMAP server to push unsolicited updates for the selected // mailbox to the connected client (which is your application). Get ComIdleStart Of hoImap To iSuccess If (iSuccess <> True) Begin Get ComLastErrorText Of hoImap To sTemp1 Showln sTemp1 Procedure_Return End // Once idling has started, your code still has to periodically check to see // if any updates have arrived. However, this is significantly different // then what normally occurs when checking email. The IdleCheck does NOT // send a message to the IMAP server. It simply checks the connection to see // if any data has arrived. If so, it can be consumed and the client (your app) // can react appropriately. // Note: It is recommended that idling only run for a max of 20 minutes before stopping and // re-starting the IDLE. This is to maintain a minimum low level of activity so that // the IMAP server does not disconnect (which it may do if it considers the connection to // be truly inactive, i.e. forgotten). // To check the connection for IDLE updates, call IdleCheck. The 1st argument indicates how // long we're willing to wait. We'll wait 1 millisecond: Get ComIdleCheck Of hoImap 1 To sIdleResultXml Get ComLastMethodSuccess Of hoImap To bTemp1 If (bTemp1 <> True) Begin Get ComLastErrorText Of hoImap To sTemp1 Showln sTemp1 Procedure_Return End // See the online reference documentation for details regarding the XML that is returned. // Your application code would parse the XML to determine what action to take. // If the XML contains "<idle></idle>", then no updates are available and your application // would call IdleCheck again at some point in the future. // If updates are available, the IDLE must be terminated by calling IdleDone, like this: Get ComIdleDone Of hoImap To iSuccess If (iSuccess <> True) Begin Get ComLastErrorText Of hoImap To sTemp1 Showln sTemp1 Procedure_Return End // Once the IDLE is terminated, your application can make calls to fetch email, etc. // Any attempt to communicate with the IMAP server prior to terminating the IDLE will // result in failure. // IMPORTANT: Please realize that your application code will be structured differently than shown here. // The call to IdleCheck will likely be in a function/procedure that is periodically called // after the IdleStart has been called from some other location in your app End_Procedure |
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