Read IMAP Email Headers

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Call FetchHeaders to download only the email headers.

Dim imap As New Chilkat.Imap()

Dim success As Boolean

'  Anything unlocks the component and begins a fully-functional 30-day trial.
success = imap.UnlockComponent("Anything for 30-day trial")
If (success <> true) Then
    MsgBox(imap.LastErrorText)
    Exit Sub
End If


'  Connect to an IMAP server.
success = imap.Connect("mail.chilkatsoft.com")
If (success <> true) Then
    MsgBox(imap.LastErrorText)
    Exit Sub
End If


'  Login
success = imap.Login("****","****")
If (success <> true) Then
    MsgBox(imap.LastErrorText)
    Exit Sub
End If


'  Select an IMAP mailbox
success = imap.SelectMailbox("Inbox")
If (success <> true) Then
    MsgBox(imap.LastErrorText)
    Exit Sub
End If



Dim messageSet As Chilkat.MessageSet
'  We can choose to fetch UIDs or sequence numbers.
Dim fetchUids As Boolean
fetchUids = true
'  Get the message IDs of all the emails in the mailbox
messageSet = imap.Search("ALL",fetchUids)
If (messageSet Is Nothing ) Then
    MsgBox(imap.LastErrorText)
    Exit Sub
End If


'  When downloading headers, each email object contains
'  (obviously) the headers, but the body will be missing.
'  Also, attachments will not be included.  However, it is
'  possible to get information about the attachments
'  as well as the complete size of the email.
Dim bundle As Chilkat.EmailBundle
bundle = imap.FetchHeaders(messageSet)
If (bundle Is Nothing ) Then

    MsgBox(imap.LastErrorText)
    Exit Sub
End If


'  Loop over the email objects and display information
'  about each:
Dim i As Long
For i = 0 To bundle.MessageCount - 1
    Dim email As Chilkat.Email
    email = bundle.GetEmail(i)

    '  Display the From and Subject
    TextBox1.Text = TextBox1.Text & email.From & vbCrLf
    TextBox1.Text = TextBox1.Text & email.Subject & vbCrLf

    '  Display the recipients:
    Dim j As Long
    Dim name As String
    Dim addr As String
    For j = 0 To email.NumTo - 1
        name = email.GetToName(j)
        addr = email.GetToAddr(j)
        TextBox1.Text = TextBox1.Text & name & ", " _
             & addr & vbCrLf
    Next
    For j = 0 To email.NumCC - 1
        name = email.GetCcName(j)
        addr = email.GetCcAddr(j)
        TextBox1.Text = TextBox1.Text & name & ", " _
             & addr & vbCrLf
    Next

    '  Show the total size of the email, including body and attachments:
    TextBox1.Text = TextBox1.Text & email.Size & vbCrLf

    '  When a full email is downloaded, we would use the
    '  email.NumAttachments property in conjunction with the
    '  email.GetMailAttach* methods.
    '  However, when an email object contains only the header,
    '  we need to access the attachment info differently:
    Dim numAttach As Long
    numAttach = imap.GetMailNumAttach(email)
    For j = 0 To numAttach - 1
        TextBox1.Text = TextBox1.Text & imap.GetMailAttachFilename(email,j) & vbCrLf
        Dim attachSize As Long
        attachSize = imap.GetMailAttachSize(email,j)
        TextBox1.Text = TextBox1.Text & "    size = " _
             & attachSize & " bytes" & vbCrLf
    Next

    TextBox1.Text = TextBox1.Text & "--" & vbCrLf

Next

'  Disconnect from the IMAP server.
imap.Disconnect()