(Xojo Plugin) Download an IMAP Message Set

Demonstrates how to read a set of IMAP emails.

Note: This example requires Chilkat v11.0.0 or greater.

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Dim success As Boolean
success = False

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

Dim imap As New Chilkat.Imap

// Connect using TLS.
imap.Ssl = True
imap.Port = 993
success = imap.Connect("imap.example.com")
If (success = False) Then
    System.DebugLog(imap.LastErrorText)
    Return
End If

// Authenticate
success = imap.Login("email_account_login","email_account_password")
If (success = False) Then
    System.DebugLog(imap.LastErrorText)
    Return
End If

// Select an IMAP mailbox
success = imap.SelectMailbox("Inbox")
If (success = False) Then
    System.DebugLog(imap.LastErrorText)
    Return
End If

// Search for messages with the word "test" in the subject.
Dim fetchUids As Boolean
fetchUids = True

Dim messageSet As New Chilkat.MessageSet
success = imap.QueryMbx("Subject test",fetchUids,messageSet)
If (success = False) Then
    System.DebugLog(imap.LastErrorText)
    Return
End If

// Download the messages in a single call to FetchMsgSet.
// 
// This only makes sense if the number of emails to be downloaded is not too large.  
// For example, you wouldn't want to download 10000 emails in a single call to FetchMsgSet.
// Why? For two reasons:  (1) It could potentially cause an out-of-memory condition, and 
// (2) it would take an extremely large amount of time.  The longer the amount of time,
// the greater the likelihood of some kind of external networking or server problem occuring,
// and if it happens, then you would need to re-download everything from the beginning again.
// For large numbers of emails, it's better to loop over the emails in the message set
// and download/process one at a time as shown here: Download IMAP Messages One at a Time
// Downloading one message at a time makes it possible to resume the downloads rather than restart the entire operation all over again.

// If the message set is reasonable in size, you can download all at once using FetchMsgSet:

System.DebugLog("Number of messages = " + Str(messageSet.Count))

Dim bundle As New Chilkat.EmailBundle
Dim headersOnly As Boolean
headersOnly = False
success = imap.FetchMsgSet(headersOnly,messageSet,bundle)
If (success = False) Then
    System.DebugLog(imap.LastErrorText)
    Return
End If

// Display the Subject and From of each email.
Dim email As New Chilkat.Email
Dim i As Int32
i = 0
Dim numEmails As Int32
numEmails = bundle.MessageCount
While i < numEmails
    success = bundle.EmailAt(i,email)

    System.DebugLog(email.GetHeaderField("Date"))
    System.DebugLog(email.Subject)
    System.DebugLog(email.From)
    System.DebugLog("--")
    i = i + 1
Wend