SQL Server

Download a Specific GMail Message into a Chilkat Email Object

See more GMail REST API Examples

Demonstrates how to download a GMail message into a Chilkat Email object. SQL Server

-- 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)
    DECLARE @success int
    SELECT @success = 0

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

    DECLARE @http int
    EXEC @hr = sp_OACreate 'Chilkat.Http', @http OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    EXEC sp_OASetProperty @http, 'AuthToken', 'GMAIL-ACCESS-TOKEN'

    -- The id of the GMail message to download.
    DECLARE @id nvarchar(4000)
    SELECT @id = '166e50fed0b9b0cb'
    DECLARE @userId nvarchar(4000)
    SELECT @userId = 'me'

    EXEC sp_OAMethod @http, 'SetUrlVar', @success OUT, 'userId', 'me'
    EXEC sp_OAMethod @http, 'SetUrlVar', @success OUT, 'id', @id

    -- Fetch the email.
    DECLARE @url nvarchar(4000)
    SELECT @url = 'https://www.googleapis.com/gmail/v1/users/{$userId}/messages/{$id}?format=raw'
    DECLARE @sbJson int
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbJson OUT

    EXEC sp_OAMethod @http, 'DownloadSb', @success OUT, @url, 'utf-8', @sbJson
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @sbJson
        RETURN
      END

    DECLARE @json int
    EXEC @hr = sp_OACreate 'Chilkat.JsonObject', @json OUT

    EXEC sp_OAMethod @json, 'LoadSb', @success OUT, @sbJson
    EXEC sp_OASetProperty @json, 'EmitCompact', 0

    EXEC sp_OAGetProperty @http, 'LastStatus', @iTmp0 OUT
    IF @iTmp0 <> 200
      BEGIN
        EXEC sp_OAMethod @json, 'Emit', @sTmp0 OUT
        PRINT @sTmp0

        PRINT 'Failed.'
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @sbJson
        EXEC @hr = sp_OADestroy @json
        RETURN
      END

    -- The returned JSON contains something like this:

    -- {
    --   "id": "166e50fed0b9b0cb",
    --   "threadId": "166e50fed0b9b0cb",
    --   "labelIds": [
    --     "CATEGORY_SOCIAL",
    --     "INBOX"
    --   ],
    --   "snippet": "...",
    --   "historyId": "582477",
    --   "internalDate": "1541441317000",
    --   "sizeEstimate": 28603,
    --   "raw": "BASE64URL_CONTENT"
    -- }

    -- The RFC822 MIME of the email is contained in the "raw" as a base64URL encoded string.
    -- Let's decode and load into a Chilkat email object..
    DECLARE @sbRaw int
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbRaw OUT

    EXEC sp_OAMethod @json, 'StringOfSb', @success OUT, 'raw', @sbRaw
    EXEC sp_OAMethod @sbRaw, 'Decode', @success OUT, 'base64url', 'utf-8'

    DECLARE @email int
    EXEC @hr = sp_OACreate 'Chilkat.Email', @email OUT

    EXEC sp_OAMethod @email, 'SetFromMimeSb', @success OUT, @sbRaw

    -- Now we can use the email API to do whatever we desire..

    EXEC sp_OAGetProperty @email, 'FromAddress', @sTmp0 OUT
    PRINT 'From: ' + @sTmp0

    EXEC sp_OAGetProperty @email, 'Subject', @sTmp0 OUT
    PRINT 'Subject: ' + @sTmp0
    -- ...

    EXEC @hr = sp_OADestroy @http
    EXEC @hr = sp_OADestroy @sbJson
    EXEC @hr = sp_OADestroy @json
    EXEC @hr = sp_OADestroy @sbRaw
    EXEC @hr = sp_OADestroy @email


END
GO