| Subject | Re: Error Code 239 IDAPI error |
| From | Edward Racht <eracht@yahoo.com> |
| Date | Sat, 21 Oct 2023 13:53:21 -0400 |
| Newsgroups | dbase.getting-started |
On 10/20/2023 8:37 AM, MichaelItaliano wrote: > I do run timers in the second app that checks if new records a re > written and then writes them to a server somewhere. There are some threads in programming concerning something similar to your issue - you may be interested in. ed -------------------------- Re: timer class From Andy Taylor <andy.taylor.1959@outlook.com> Date Sat, 05 Dec 2020 04:50:37 -0500 Newsgroups dbase.programming Hi Gaetano, > > MethodTwo > Yes, I have implemented that. It seems to work but I need to launch > another run in the morning to check if that affects another session of dBase. As I understand it each instance of dBASE should be fully encapsulated and effectively ignored by the others. >> Finally, if you make the timer an object of the form AND you refer back to the form as the timer's parent make sure you remove the >> parent reference from the timer before you close the form; otherwise dBASE wont release the form from memory properly. You don't >> need to do this but I usually do as it allows me to traverse all form objects easily using the inspector. >> > good tip, thanks! I have disabled the timer, but how do I remove the parent link? > this.timer.parent = null in the onClose event handler? Yes, that removes the reference from the timer object but I would also do this.timer = null form the form because I'm anal about it. > by the way, you mentioned canClose, why not onClose? Just because onClose happens after the close event and normally I don't want an active timer if the form has closed in case the timer fires when I don't want it to - say when the form is still closing. In this case however, the onTimer event actually closes the form so the point is probably moot. I would change your code slightly to read as follows: function form_canClose() this.timer.enabled = false this.timer.parent = null this.timer = null // at this point the timer should release from memory automatically as nothing is holding it in place return function form_onOpen() this.timer = new Timer( ) // Make timer a property of the form this.timer.parent = this // Assign form as timer's parent this.timer.onTimer = {;this.parent.close()} this.timer.interval = 13 // Fire timer every 13 seconds this.timer.enabled = true // Activate timer return | |