Login ProductsSalesSupportDownloadsAbout |
Home » Technical Support » DBISAM Technical Support » Support Forums » DBISAM General » View Thread |
Messages 1 to 8 of 8 total |
Sorry to ask this here but ... |
Thu, Jul 13 2006 10:45 AM | Permanent Link |
adam | Sorry to ask this here, I am working on a DBISAM Delphi project in Uganda at the moment &
only have access to a few web-sites to ask the question! I am having a persistent fault on-close of my DB app ... "invalid pointer operation" I am 100% certain the problem is some object attempting to free another object which has already been freed, or something similar. I just need to find the point where the error occurs. However when I step through the project I hit a procedure which is called 100's of times & I can't reach the end using F7 or F8. Can I exclude a single procedure from the "step" process in Debug? Can I exclude a whole unit from debug, while still using the code in the project? ... These are silly newbie questions, but I can't find them covered anywhere in my help! Adam Brett |
Thu, Jul 13 2006 11:40 AM | Permanent Link |
Roy Lambert NLH Associates Team Elevate | adam
>I am 100% certain the problem is some object attempting to free another object which has >already been freed, or something similar. I just need to find the point where the error >occurs. However when I step through the project I hit a procedure which is called 100's of >times & I can't reach the end using F7 or F8. I know the feeling >Can I exclude a single procedure from the "step" process in Debug? NO! (much gnashing of teeth) >Can I exclude a whole unit from debug, while still using the code in the project? YES - just add {$D-} at the start (I usually stuff it the line after Unit.....) Don't forget to Alt-P-B after you've made the change Roy Lambert |
Thu, Jul 13 2006 2:17 PM | Permanent Link |
Tim Young [Elevate Software] Elevate Software, Inc. timyoung@elevatesoft.com | Adam,
<< I am 100% certain the problem is some object attempting to free another object which has already been freed, or something similar. I just need to find the point where the error occurs. However when I step through the project I hit a procedure which is called 100's of times & I can't reach the end using F7 or F8. >> If you're using a tree view or list view with an attached data pointer in the items, make sure that you always free the item before freeing the object/data that is pointed to by the data pointer. That one always trips me up. -- Tim Young Elevate Software www.elevatesoft.com |
Thu, Jul 13 2006 2:43 PM | Permanent Link |
Roy Lambert NLH Associates Team Elevate | Tim
>If you're using a tree view or list view with an attached data pointer in >the items, make sure that you always free the item before freeing the >object/data that is pointed to by the data pointer. That one always trips >me up. That really baffles my brain. Free the treeview before you free the objects? Roy Lambert |
Fri, Jul 14 2006 1:46 AM | Permanent Link |
"Clive" | Hi Adam,
Install MadExcept if should report the source code line the error is occuring on Thanks Clive. "adam" <adam@nospameplease.fmfoods.co.uk> wrote in message news:22CF27D1-567B-4062-B599-7712DC57F5AE@news.elevatesoft.com... > Sorry to ask this here, I am working on a DBISAM Delphi project in Uganda > at the moment & > only have access to a few web-sites to ask the question! > > I am having a persistent fault on-close of my DB app ... "invalid pointer > operation" > > I am 100% certain the problem is some object attempting to free another > object which has > already been freed, or something similar. I just need to find the point > where the error > occurs. However when I step through the project I hit a procedure which is > called 100's of > times & I can't reach the end using F7 or F8. > > Can I exclude a single procedure from the "step" process in Debug? > Can I exclude a whole unit from debug, while still using the code in the > project? > > .. These are silly newbie questions, but I can't find them covered > anywhere in my help! > > Adam Brett > |
Fri, Jul 14 2006 4:07 AM | Permanent Link |
adam | Wow guys ... thanks for these great responses ... not even 1 snide comment about how I
ought to know better! The {D$-} tip is the one I wish I'd known 5 years ago! (where is that in the Delphi help!!!) Tim is spot on about trees too, but I use something called "virtualtreeview" (can't recommend it strongly enough - freeware, Delphi Gems) which I have sorted out not to give that problem. I will check out MadExcept ... Adam |
Fri, Jul 14 2006 5:51 AM | Permanent Link |
"Jan Derk" | adam wrote:
> I am 100% certain the problem is some object attempting to free > another object which has already been freed, or something similar. I > just need to find the point where the error occurs. If you use FastMM4 in full debug mode it will give you three call stacks, one for where the object was created, one for when the object was freed and one for where the code is trying to access the already freed object. FastMM4 is amazing for these kind of problems. Jan Derk |
Fri, Jul 14 2006 2:45 PM | Permanent Link |
Tim Young [Elevate Software] Elevate Software, Inc. timyoung@elevatesoft.com | Roy,
<< That really baffles my brain. Free the treeview before you free the objects? >> No, I meant freeing any treeview item before you free the object/pointer that is attached to the item via its Data property. -- Tim Young Elevate Software www.elevatesoft.com |
This web page was last updated on Saturday, April 27, 2024 at 08:52 PM | Privacy PolicySite Map © 2024 Elevate Software, Inc. All Rights Reserved Questions or comments ? E-mail us at info@elevatesoft.com |