(SQL Server) Fetch 1st N Headers of Search Results

Calls Search to get a message set, then downloads the 1st N messages in the message set. There are two equivalent ways of doing it: (1) iterate from 0 to N-1 and download each message individually, or (2) create a new message set that contains the 1st N messages and pass it to FetchHeaders. Both are demonstrated here.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- This example assumes the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @imap int
    -- Use "Chilkat_9_5_0.Imap" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Imap', @imap OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Connect to an IMAP server.
    -- Use TLS
    EXEC sp_OASetProperty @imap, 'Ssl', 1
    EXEC sp_OASetProperty @imap, 'Port', 993
    DECLARE @success int
    EXEC sp_OAMethod @imap, 'Connect', @success OUT, 'imap.someMailServer.com'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        RETURN
      END

    -- Login
    EXEC sp_OAMethod @imap, 'Login', @success OUT, '****', '****'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        RETURN
      END

    -- Select an IMAP mailbox
    EXEC sp_OAMethod @imap, 'SelectMailbox', @success OUT, 'Inbox'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        RETURN
      END

    DECLARE @messageSet int

    -- We can choose to fetch UIDs or sequence numbers.
    DECLARE @fetchUids int
    SELECT @fetchUids = 1
    -- Get the message IDs of all the emails in the mailbox
    EXEC sp_OAMethod @imap, 'Search', @messageSet OUT, 'ALL', @fetchUids
    EXEC sp_OAGetProperty @imap, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 = 0
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        RETURN
      END

    DECLARE @numFound int
    EXEC sp_OAGetProperty @messageSet, 'Count', @numFound OUT
    IF @numFound = 0
      BEGIN

        PRINT 'No messages found.'
        EXEC @hr = sp_OADestroy @messageSet

        EXEC @hr = sp_OADestroy @imap
        RETURN
      END

    -- Get the 1st 10 messages in messageSet.
    DECLARE @upperBound int
    SELECT @upperBound = 10
    IF @numFound < @upperBound
      BEGIN
        SELECT @upperBound = @numFound
      END

    DECLARE @i int
    SELECT @i = 0
    DECLARE @bUid int
    EXEC sp_OAGetProperty @messageSet, 'HasUids', @bUid OUT
    WHILE @i < @upperBound
      BEGIN

        DECLARE @email int
        EXEC sp_OAMethod @messageSet, 'GetId', @iTmp0 OUT, @i
        EXEC sp_OAMethod @imap, 'FetchSingleHeader', @email OUT, @iTmp0, @bUid
        EXEC sp_OAGetProperty @imap, 'LastMethodSuccess', @iTmp0 OUT
        IF @iTmp0 = 0
          BEGIN
            EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
            PRINT @sTmp0
            EXEC @hr = sp_OADestroy @messageSet

            EXEC @hr = sp_OADestroy @imap
            RETURN

          END
        ELSE
          BEGIN
            -- Do whatever is needed with the email.. 
            -- ....

            EXEC @hr = sp_OADestroy @email

          END

        SELECT @i = @i + 1
      END

    -- Alternatively, create a new message set containing the 1st 10 message id's (UID's) 
    -- from the search results message set:
    DECLARE @firstTen int
    -- Use "Chilkat_9_5_0.MessageSet" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.MessageSet', @firstTen OUT

    SELECT @i = 0
    WHILE @i <= @upperBound - 1
      BEGIN
        EXEC sp_OAMethod @messageSet, 'GetId', @iTmp0 OUT, @i
        EXEC sp_OAMethod @firstTen, 'InsertId', NULL, @iTmp0
        SELECT @i = @i + 1
      END

    EXEC @hr = sp_OADestroy @messageSet

    -- Download the 1st ten headers:
    DECLARE @bundle int

    EXEC sp_OAMethod @imap, 'FetchHeaders', @bundle OUT, @firstTen
    EXEC sp_OAGetProperty @imap, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 = 0
      BEGIN
        EXEC @hr = sp_OADestroy @firstTen

        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        EXEC @hr = sp_OADestroy @firstTen
        RETURN
      END

    -- Other examples show how to iterate over the emails contained within the bundle...

    -- Disconnect from the IMAP server.
    EXEC sp_OAMethod @imap, 'Disconnect', @success OUT

    EXEC @hr = sp_OADestroy @firstTen

    EXEC @hr = sp_OADestroy @bundle


    EXEC @hr = sp_OADestroy @imap
    EXEC @hr = sp_OADestroy @firstTen


END
GO