Visual FoxPro Requires Chilkat v11.0.0+

IMAP Search with THREAD Semantics

See more IMAP Examples

Demonstrates how to search an IMAP mailbox and return message numbers grouped together in parent/child relationships based on which messages are replies to others. Visual FoxPro

LOCAL lnSuccess
LOCAL loImap
LOCAL loJson
LOCAL lnNumThreads
LOCAL loArr
LOCAL lnThreadSize
LOCAL i
LOCAL loSubArr

lnSuccess = 0

*  This example requires the Chilkat API to have been previously unlocked.
*  See Global Unlock Sample for sample code.

loImap = CreateObject('Chilkat.Imap')

*  Connect to your IMAP server and authenticate..
loImap.Ssl = 1
loImap.Port = 993
lnSuccess = loImap.Connect("imap.mail.us-west-2.awsapps.com")
IF (lnSuccess = 0) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    CANCEL
ENDIF

lnSuccess = loImap.Login("myLogin","myPassword")
IF (lnSuccess = 0) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    CANCEL
ENDIF

*  Select a mailbox
lnSuccess = loImap.SelectMailbox("Inbox")
IF (lnSuccess = 0) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    CANCEL
ENDIF

*  Search for all message having the letter 'a' somewhere in the Subject,
*  and return the messages as JSON.
loJson = CreateObject('Chilkat.JsonObject')
lnSuccess = loImap.QueryThread("REFERENCES","SUBJECT a",1,loJson)
IF (lnSuccess = 0) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    RELEASE loJson
    CANCEL
ENDIF

*  The IMAP server will return a raw response with a format such as this:  (2)(3 6 (4 23)(44 7 96))

*  In tree form, it's like this:
*  
*              -- 2
*              -- 3
*                  \-- 6
*                     |-- 4
*                     |      \-- 23
*                     |
*                     |-- 44
*                                \-- 7
*                                        \-- 96
*  

*  It means there are 2 main threads returned, but the 2nd thread splits into two sub-threads.
*  In total, we can think of it as 3 threads -- 2 main threads (with no parents) and one sub-thread w/ a parent.
*  
*  - The 1st thread contains the message 2, and has no parent thread.
*  - The 2nd thread contains the messages 3, 6, 4, 23, and has no parent thread.
*  - The 3rd thread contains the messages 44, 7, 96 and the parent thread is message 6.
*  

*  (Yes, this is all highly confusing...)

*  Chilkat will return the above sample response as JSON that looks like this:

*  {
*    "threads": [
*      [2],
*      [3, 6, [4, 23], [44, 7, 96]]
*    ]
*  }
*  

*  Use this online tool to generate parsing code from sample JSON: 
*  Generate Parsing Code from JSON
*  In this case, the online tool can help you get a feel for how to write the JSON parsing code..

lnNumThreads = loJson.SizeOfArray("threads")
? "The total number of top-level threads is " + STR(lnNumThreads)

*  Let's say we wanted to get the messages in the thread 3, 6, 4, 23.
*  We always follow the 1st branch to the bottom, ignoring the other branches.
*  For example, if we had  [3, 5, [4, 23, [55, 56, 57], [68, 69]], [44, 7, 96]]
*  then the thread would be 3, 5, 4, 43, 55, 56, 57

*  For testing, let's substitute the response from the IMAP server with this sample:
loJson.Load('{"threads": [[2], [3, 5, [4, 23, [55, 56, 57], [68, 69]], [44, 7, 96]]]}')

*  Begin with the 2nd top-level thread, which is at index 1.
? "Following the 2nd top level thread..."
loArr = loJson.ArrayOf("threads[1]")
lnThreadSize = loArr.Size
i = 0
DO WHILE i < lnThreadSize
    *  Do we have an array or integer at this position?
    IF (loArr.TypeAt(i) = 4) THEN
        *  This is a sub-array.
        loSubArr = loArr.ArrayAt(i)
        RELEASE loArr
        *  Follow the sub-array starting at the 1st position..
        loArr = loSubArr
        i = 0
        lnThreadSize = loArr.Size
    ELSE
        *  Must be a single integer.
        ? STR(loArr.IntAt(i))
        i = i + 1
    ENDIF

ENDDO

*  The output is:
*  
*  Following the 2nd top level thread...
*  3
*  5
*  4
*  23
*  55
*  56
*  57

RELEASE loImap
RELEASE loJson