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sending_20an_20email_20with_20attachments

This is an old revision of the document!


Sending an email with attachments

by Richard Russell, October 2012, corrected August 2015

See also [[/Sending%20an%20HTML%20email%20with%20optional%20attachments|Sending an HTML email with optional attachments]]


In the article Sending an email automatically the procedure PROCsendmail() automatically sends an email using the SOCKLIB library. Listed below is a procedure which performs the same function except that you can specify one or more files to attach to the email. The final parameter is a comma-separated list of the pathnames of the file(s) you wish to attach. The procedure might be called as follows:

      INSTALL @lib$+"SOCKLIB"
      SMTP$    = "smtp.gmail.com"
      From$    = "sender@somewhere"
      To$      = "recipient@elsewhere"
      Subject$ = "Test of sending attachments"
      ReplyTo$ = "reallyme@myaddress"
      Message$ = "This is a test of sending an email with attachments."
      Attach$ =  "C:\invoice12345.pdf, " + \
      \          """C:\Program Files\BBC BASIC for Windows\readme.txt"""
      PROCsendmailattach(SMTP$,From$,To$,"","",Subject$,ReplyTo$,Message$,Attach$)

The calling program should first check that the attached files actually exist, because if not PROCattach() will abort with an error and not terminate the SMTP transaction; this could leave the server 'in limbo'. Note that if an attached file path contains spaces or punctuation characters you must enclose it in quotes.

Here is PROCsendmailattach(); like PROCsendmail() it cannot be used if authentication is required so in practice that probably means that your ISP's SMTP server must be used:

      DEF PROCsendmailattach(smtp$,from$,rcpt$,cc$,bcc$,subject$,replyto$,body$,attach$)
      LOCAL D%, S%, skt%, comma%, reply$, file$
      DIM D% LOCAL 31, S% LOCAL 15
      SYS "GetLocalTime", S%
      SYS "GetDateFormat", 0, 0, S%, "ddd, dd MMM yyyy ", D%, 18
      SYS "GetTimeFormat", 0, 0, S%, "HH:mm:ss +0000", D%+17, 15
      D%?31 = 13
      PROC_initsockets
      skt% = FN_tcpconnect(smtp$,"mail")
      IF skt% <= 0 skt% = FN_tcpconnect(smtp$,"25")
      IF skt% <= 0 ERROR 100, "Failed to connect to mail server"
      IF FN_readlinesocket(skt%, 1000, reply$)
      WHILE FN_readlinesocket(skt%, 10, reply$) > 0 : ENDWHILE
      PROCsend(skt%,"HELO "+FN_gethostname)
      PROCmail(skt%,"MAIL FROM: ",from$)
      IF rcpt$<>"" PROClist(skt%,rcpt$)
      IF cc$<>"" PROClist(skt%,cc$)
      IF bcc$<>"" PROClist(skt%,bcc$)
      PROCsend(skt%, "DATA")
      IF FN_writelinesocket(skt%, "Date: "+$D%)
      IF FN_writelinesocket(skt%, "From: "+from$)
      IF FN_writelinesocket(skt%, "To: "+rcpt$)
      IF cc$<>"" IF FN_writelinesocket(skt%, "Cc: "+cc$)
      IF subject$<>"" IF FN_writelinesocket(skt%, "Subject: "+subject$)
      IF replyto$<>"" IF FN_writelinesocket(skt%, "Reply-To: "+replyto$)
      IF FN_writelinesocket(skt%, "MIME-Version: 1.0")
      IF attach$="" THEN
        IF FN_writelinesocket(skt%, "Content-Type: text/plain; charset=US-ASCII")
      ELSE
        IF FN_writelinesocket(skt%, "Content-Type: multipart/mixed; boundary=""BB4Wsep""")
        IF FN_writelinesocket(skt%, "")
        IF FN_writelinesocket(skt%, "--BB4Wsep")
        IF FN_writelinesocket(skt%, "Content-Type: text/plain")
        IF FN_writelinesocket(skt%, "Content-Transfer-Encoding: 7bit")
      ENDIF
      IF FN_writelinesocket(skt%, "")
      IF FN_writelinesocket(skt%, body$)
      IF attach$<>"" THEN
        REPEAT
          WHILE ASCattach$=32 attach$ = MID$(attach$,2) : ENDWHILE
          IF ASCattach$=34 THEN
            file$ = EVAL(attach$)
            comma% = INSTR(attach$, ",", LENfile$)
          ELSE
            comma% = INSTR(attach$, ",")
            IF comma% file$ = LEFT$(attach$, comma%-1) ELSE file$ = attach$
          ENDIF
          PROCattach(skt%, file$)
          attach$ = MID$(attach$, comma%+1)
        UNTIL comma%=0
        IF FN_writelinesocket(skt%, "--BB4Wsep--")
      ENDIF
      IF FN_writelinesocket(skt%, ".")
      PROCsend(skt%,"QUIT")
      PROC_exitsockets
      ENDPROC
      DEF PROClist(skt%,list$)
      LOCAL comma%
      REPEAT
        WHILE ASClist$=32 list$=MID$(list$,2):ENDWHILE
        comma% = INSTR(list$,",")
        IF comma% THEN
          PROCmail(skt%,"RCPT TO: ",LEFT$(list$,comma%-1))
          list$ = MID$(list$,comma%+1)
        ELSE
          PROCmail(skt%,"RCPT TO: ",list$)
        ENDIF
      UNTIL comma% = 0
      ENDPROC
      DEF PROCmail(skt%,cmd$,mail$)
      LOCAL I%,J%
      I% = INSTR(mail$,"<")
      J% = INSTR(mail$,">",I%)
      IF I% IF J% THEN
        PROCsend(skt%, cmd$+MID$(mail$,I%,J%-I%+1))
      ELSE
        PROCsend(skt%, cmd$+"<"+mail$+">")
      ENDIF
      ENDPROC
      DEF PROCsend(skt%,cmd$)
      LOCAL reply$
      IF FN_writelinesocket(skt%,cmd$) < 0 THEN
        ERROR 100, "Send failed"
      ENDIF
      IF FN_readlinesocket(skt%, 200, reply$)
      WHILE FN_readlinesocket(skt%, 10, reply$) > 0 : ENDWHILE
      ENDPROC
      DEF PROCattach(skt%,file$)
      LOCAL D%, F%, I%, L%, N%, A$, B$
      B$ = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
      F% = OPENIN(file$)
      IF F%=0 ERROR 100, "Failed to open attached file " + file$
      REPEAT
        D% = INSTR(file$, "\")
        IF D%=0 D% = INSTR(file$, "/")
        IF D% file$ = MID$(file$, D%+1)
      UNTIL D%=0
      IF FN_writelinesocket(skt%, "")
      IF FN_writelinesocket(skt%, "--BB4Wsep")
      IF FN_writelinesocket(skt%, "Content-Type: application/octet-stream")
      IF FN_writelinesocket(skt%, "Content-Disposition: attachment; filename="+file$)
      IF FN_writelinesocket(skt%, "Content-Transfer-Encoding: base64")
      IF FN_writelinesocket(skt%, "")
      L% = EXT#F%
      WHILE NOT EOF#F%
        N% = L% - PTR#F%
        D% = BGET#F% << 16 OR BGET#F% << 8 OR BGET#F%
        FOR I% = 1 TO 4 : A$ += MID$(B$,(D% >>> 18)+1,1) : D% = D% << 6 AND &FFFFFF : NEXT
        IF N%=1 RIGHT$(A$,2) = "==" ELSE IF N%=2 RIGHT$(A$) = "="
        IF LENA$>=72 IF FN_writelinesocket(skt%,A$)=0 A$ = ""
      ENDWHILE
      IF A$<>"" IF FN_writelinesocket(skt%, A$)
      CLOSE #F%
      ENDPROC
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sending_20an_20email_20with_20attachments.1522502380.txt.gz · Last modified: 2018/03/31 14:19 by 127.0.0.1