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Creating a Ical ics file

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  • Creating a Ical ics file

    I have read the post from Gary Flanigan

    While this is useful from what I can tell he is using the dates as D but the time as C. This does not seem to be the best for what I am trying to do.

    In Alpha a Date as D is the date. 08/25/2015
    A Time as T is Date and Time. 08/25/2015 02:00:00 00 am

    In the ics file there are 2 date and times that need to be filled in as this will be for events which have a start and end date and time.
    DTSTART and DTEND. The format would be as follows.

    DTSTART:20150825T130000Z (08/25/2015 at 1300 zulu)

    I need to figure out how to pull just the date out of the Time field. Once I can do that I think I can reformat it to the required order for the ics file by using something like this date_format(newstartdate,"yyyyMMdd")

    Then I need to pull the time out of the Time field. I will then need to convert it to 24 hour format.

  • #2
    Re: Creating a Ical ics file

    t = now()
    ? t
    = 08/25/2015 09:33:29 75 am

    ? typeof(t)
    = "T"

    ? time("MM/dd/yyyy",t)
    = "08/25/2015"

    ? time("yyyyMMdd",t)
    = "20150825"

    ? time("0h:0m:0s",t)
    = "09:33:29"
    tp = t+36000
    ? time("0h:0m:0s",tp)
    = "19:33:29"
    There can be only one.


    • #3
      Re: Creating a Ical ics file

      Thanks Stan.

      Using what you posted in a slightly different way seems to get the results I need.

      time("yyyyMMdd",Export_Sch->Tmstart) yields 20150825
      time("0h0m0s",(Export_Sch->Tmstart- (gettimezoneoffset()*3600))) yields 145500

      Putting those together to get 20150825T145500Z will now be easy.

      Now I just need to build a loop to run through a table and pull out all info that matches a filter.

      The end concept is they will be able to create a scheduling record that will have many jobs that will be scheduled for the week or month. Once they have all their job scheduling data in they can click a button that will run a script. It will will then read in and convert all records linked to the main scheduling id and then create the .ics file. Once that file is create they can then import the information into Google Calendar or ZoHo Calendar.

      I will see where I get with this and either post back with the working script or any other questions I may run up against.

      Stan, you have been a great help to me over a long time. You do not know how much I appreciate it. Thank you very much.


      • #4
        Re: Creating a Ical ics file

        All sorts of tricks available. Just have to apply them.
        In one attack.....

        ? mask(time("yyyyMMdd0h0m0s",t),"        T      Z") 'eight spaces, T, six spaces, Z
        = "20150825T093329Z"
        or even easier

        ? time("yyyyMMddT0h0m0sZ",t)
        = "20150825T093329Z"
        There can be only one.


        • #5
          Re: Creating a Ical ics file

          "DTSTART:"+time("yyyyMMddT0h0m0sZ",t- (gettimezoneoffset()*3600)) = DTSTART:20150824T151500Z


          • #6
            Re: Creating a Ical ics file

            Not pretty but it does the job.

            This reads a child table for all records that belong to the parent table.
            It then writes the data out into a .ics file for importing into Google Calendar, ZoHo Calendar or possibility any calendar that can import .ics files.

            I am also attaching the test app for those who wish to play or maybe even make this better.

            dim global vt_tmstart as T
            dim global vt_tmend as T
            dim global vn_export_id as N
            dim vn_schedid as N
            dim basepath as c
            dim global filename as c
            dim file_name as c
            dim vc_event_id as C
            dim vn_priority as n
            dim vc_alarm as c
            dim vc_how as c
            dim vc_job as c
            dim Details as c
            dim vc_decript as c
            dim vc_equip as c
            dim notify as c
            dim notify1 as c
            dim notify2 as c
            if parentform.EXPORTED = .T. then
            DIM SHARED  exportagain_result as N
            DIM SHARED  exportagain_YES_Button as L 
            DIM SHARED  exportagain_NO_Button as L 
            exportagain_YES_Button = .F.
            exportagain_NO_Button = .F.
            title_var = "Already Exported"
            message_text_var = <<%text%
            You have already exported this scheduling. 
            Do you wish to export it again?
            exportagain_result=ui_msg_box(title_var,message_text_var,UI_YES_NO+ UI_SECOND_BUTTON_DEFAULT+ UI_ATTENTION_SYMBOL)
            'Test to see which button on the message box was pressed....
            	CASE exportagain_result = UI_YES_SELECTED
            		exportagain_YES_Button= .t.
            	CASE exportagain_result = UI_NO_SELECTED
            		exportagain_NO_Button= .t.
            END SELECT
            end if
            file_name = alltrim(parentform.SCHED_NAM)+".ics"
            if file_name = ".ics" then 
            	file_name = "default.ics" 'if no file name specified use default
            	end if
            basepath = a5.Get_Path()+"\\"
            filename = basepath+"schedules\\"+file_name
            vn_export_id = parentform.SCHED_ID
            dim f as p
            f = file.create(Filename,FILE_RW_EXCLUSIVE)
            f.write_line("PRODID:Shop Cal T-Five")
            tpi ="sch_details")
                WHILE .not. tpi.fetch_eof()
                     vn_schedid = tpi.sched_id
                     vn_priority = tpi.priority
                     vc_alarm = tpi.alarm
                     if vn_schedid = vn_export_id then
            			 f.write_line("DTSTART:"+time("yyyyMMddT0h0m0sZ",vt_tmstart- (gettimezoneoffset()*3600)))
            			 f.write_line("DTEND:"+time("yyyyMMddT0h0m0sZ",vt_tmend- (gettimezoneoffset()*3600)))
            			 if vc_alarm = "None" .OR. vc_alarm = "" then 
            			 	goto skipalarm
            				 notify1 = ltrim(vc_alarm,"0123456789")
            				 notify2 = case(notify1="Minute","M",notify1="minutes","M",notify1="Hour","H",notify1="Hours","H",notify1="Day","D",notify1="Days","D")
            				 notify = left(vc_alarm,2)
            				 notify = alltrim(notify)+notify2
            			 	end if
                    end if
                END WHILE
            parentform:EXPORTED.value = .T.   
            Would not let me attach the file so here is a link.
            Last edited by preston2; 08-25-2015, 08:17 PM.


            • #7
              Re: Creating a Ical ics file


              I am also exporting data to a text file and have created an export operation for this.

              I would like to open the text file and insert a header string in the first line or row of the text file AFTER the export operation has completed. It must not overwrite or replace exported data.

              I have done this so far, but cannot seem to get this correct:

              dim file_pointer as P
              file_pointer ="C:\cms\08062015.dat",FILE_RW_EXCLUSIVE)





              • #8
                Re: Creating a Ical ics file

                I have always handled this by creating a new file, writing the desired header line, writing the original data, and saving. At this point the original file can be replaced and the new file renamed to the name of the original file.

                Just now occurred to me. Since we know that the text in the original file is being overwritten to the length of the addition and the original data+ header line is longer than the original data............

                contents = file.to_string("p:\08062015.dat")
                contents = "HEADER_SAMPLE_1________1250RECORDS"+crlf()+contents
                dim file_pointer as P
                 file_pointer ="p:\08062015.dat",FILE_RW_EXCLUSIVE)
                or more simply

                contents = file.to_string("p:\08062015.dat")
                contents = "HEADER_SAMPLE_1________1250RECORDS"+crlf()+contents
                Last edited by Stan Mathews; 06-08-2016, 08:23 AM.
                There can be only one.


                • #9
                  Re: Creating a Ical ics file

                  Hi Stan,

                  Thanks for the reply.
                  Just did a test run, works pretty good, thanks