About one time in maybe a hundred of running a D5 program it tosses an "Invalid Bookmark," error. Clicking "OK" in the error message dialog moves past it and the system operates fine.
This app has about 20 TDBGrids in it and all of them at salient points have "Clear" to clear the Bookmarks. There are 17 DataSets.
Because it is so rare, and I suspect as a result of something the user has done (not their fault) just before shutting down, it is proving very difficult to find and fix.
Is there anyway I can bulk clear all bookmarks across all DataSets at start up?
I have been reading here that Bookmarks are supposed to be cleared on "Open/Close" and all DataSets are Opened at start up.
If Table1.Active then Table1.Close; // They should never be Active but...
Table.Open;
Any thoughts?
Thanks
There is no way to bulk-delete Bookmarks for a TDataSet. You have to free them one by one.
Side note: When using Bookmarks you need to be very careful, after any change (insert, update or delete) in the TDataset your bookmarks are not valid any more (often they will still work, but officially they are out of date and need to be refreshed).
Related
I have created a Main Userform that incorporates, multipage many fields and buttons and those link to various other userforms and worksheets and fields. I have reached a point where when I try to F5 I get an "Compile Error - Out of Memory"
I'm newer to troubleshooting these kinds of issues and granted I did not have a plan when I started in terms of structuring the forms and modules or what this would grow into.
This specific issue came having a Page that has a scroll feature that looks at a worksheet and pulls in records into various comboboxes based on a status of Open, closed, Hold etc. Each record is retrieving approx 7-8 fields and each page has approx 50 records that could display except closed which has to have enough for all.
I have read a couple things about ending Object to = nothing and enabling some advanced Windows to allow more memory allocation. I feel like maybe its a combination of structure and not clearing memory when i move around the tool. Any advise help or resources you could point me towards?
Attached is the Error, VBA project tree and a screen shot of one of the multipage items being pulled into the userform from the worksheet. (there will be multiple pages beside "open" that could have up to 100 or more records.
Thanks again,
Attached are Project Structure, error message, and userform-multipage screenshot example
Update: I was able to move past this, My issue was that I had a very bulky form that called a lot of textboxes and combo boxes upon initialization. This obviously required a lot of memory to render all this fields at once. Hence the error.
Solution: I re-thought the form and decided to use a list box and upon selecting a record from the list the fields I needed populate in the box below the list. This allowed me to go from hundreds of boxes to 12. This also was coupled that I had multi- page within a page. Sometimes you just need to take a step back and rethink and restructure your plan.
Updates
2016-02-18: Added process information
I have a Delphi program compiled using XE4. It is being used by a few hundred customers. A couple of weeks ago one of these customers reported that some areas of the executable was being erased (images bellow) randomly during the day. This client has 35 sites using this exe and the problem occurs on no more than 10 of these sites.
Investigation
1 - My first suspicion was an infinite loop. The exe keeps responding while the components are erased, nothing changed on the code so radically from the time this problem did'n happen and the logs don't show any loop (this exe has logs everywhere).
2 - Misbehaving threads. I have a separate thread that syncs data between this exe and our server in the cloud. Again, logs don't show that the thread is running when the problem occur and again, nothing was changed here.
3 - Some other program (antivirus?) is affecting my exe. Couldn't investigate this hipotesis properly yet, but until now couldn't find any installed program that raised my attention.
My question is: What could be causing this issue? How can I investigate further? I know this may be a wide question but this is all information I could gather and I can't imagine many more places to look at.
Images
1 - In the image bellow the red-stroked area should be a TToolBar
2 - In this second image there are three areas, from the top to the bottom the first one should be a TToolBar, the second one should be the title of the child form and the third one should be a TwwDBGrid
3 - The third example shows on the top the erased area where should be a TEdit, just bellow it there's what should be a line on a TwwDBGrid and on the side we can see an erased scrollbar from the TwwDBGrid
4 - This last example shows 5 erased areas: The title of the application, the main TToolBar, The title of the Form, a TButton and two TwwDBGrid
5 - This is an interesting example beacause beyond the erased components there are 4 TSpeedButtons that are not erased but they are without the images they have originally (the first red stroked areas). The other 3 red stroked areas are, in order, 2 TEdits, a TwwDBGrd and a TButton
Process Information
I got a screenshot by the momment the problem occurs. scgolr is my software.
There is really not enough detailed information to give you a definite answer. However, I can answer with some directions on your question:
How can I investigate further?
Because of what you have stated:
The program is in use by a few hundred customers
One (only) customer experiences the problem
First occurance of the problem was some weeks ago
the first thing to do, is get in contact with the customer, and get the information you say that you have asked for but not got. The questions that need to be answered are:
What has changed in the customers environment at the time the problem
started with respect to hardware, network, server, OS, other software
running in the PCs?
Has anything changed in the way your customer is using your software?
What do the customer have to do to get rid of the problem, once it occurs? Close the program? Restart the PC? Or maybe just minimize - restore the erroneous window?
With the above I do not suggest that the fault is with this one customer and their equipment or their way of using the software. It may just be that the combination at the site which is different from all your other customers, triggers the problem to show up.
Some specific things to check in your software and at the site when problem occurs and if the problem goes away with a minimize - restore of the application (which would suggest a painting interrupted problem:
Do you call Application.ProcessMessages at any time?
Does the background thread access same data as the GUI? If yes, are the data protection properly in place (locking, synchronisation).
Does the background thread access any GUI components without Synchronize?
Finally I suggest that you visit the customer onsite. You get much better and faster answers in a direct discussion.
Edit after process information received.
There is nothing alarming concerning GDI or User objects. But it is alarming when you say in the comments that you call Application.ProcessMessages in many places, obviously to 'fix' a non-responsive UI. For example, what happens if the user double clicks a button, but does it slowly enough that Windows detects it as to separate clicks? First click may start your long lasting procedure within which you call A.P. The second click is read from the message que which starts the same procedure. Now the second call to the procedure runs (with its own calls to A.P.) and eventually ends and execution returns to the first call. Depending on what you do in this procedure, you may well be messing up handles and device contexts etc. A strong recommendation said with a friendly intent: Get rid of those calls to A.P.
the problem is with the security plugin (Warsaw - Gas Tecnologia) bank's website that your client is accessing , update it and it will be solved , the problem happens in Brazil
As #SebastianZ and #AlekseyK pointed out you may experiment exaustin of some GDI resource (handles?).
If the system coukd be accessed some tools like Process explerer or process hacker could give you some hints. This utility may help too GDIView
I don't know if this may apply to your case, but sometimes database data corruption can lead to strange effect in running programs (i remember 'Data Bombs' causing out of memory exceptions ...
So if something cause a GDI allocation loop, the graphics of your app cauld be affected in 'strange' ways
In this document describing the lifecycle of a Windows 10 UWP app, it states:
Users now expect your app to remember its state as they multitask on their device. For example, they expect the page to be scrolled to the same position and all of the controls to be in the same state as before. By understanding the application lifecycle of launching, suspending, and resuming, you can provide this kind of seamless behavior.
However, there doesn't appear to be much documentation on how this is actually achieved. I gather that everything is to be manually saved by the app developer, and then recreated from scratch on resume using whatever data you stashed away when the app was suspending, all in order to create the illusion that the exact memory state of the app never changed.
I'm trying to puzzle through this using just a minimal example, a XAML page containing nothing other than a TextBox. Even this situation, though, I'm struggling a bit to understand how to achieve the goal. I'll provide more general thoughts, but my concrete question simply is how do you save and then restore a simple TextBox for resume from termination? I'm working in C++/CX but will take any help I can get.
Here are my thoughts on this so far:
At minimum, obviously the text of the TextBox has to be saved.
This could be saved into the ApplicationData::Current->LocalSettings.
One issue I see immediately is that the document I cited above on lifecycles states that apps must take care of their saving within 5 seconds of the suspend signal or face termination. A Textbox could potentially hold a lot of data, causing a save to potentially be cutoff in the face of busy IO, particularly if we start scaling beyond the trivial single TextBox situation.
Fortunately, the document states, "We recommended that you use the application data APIs for this purpose because they are guaranteed to complete before the app enters the Suspended state. For more info, see Accessing app data with the UWP app." Unfortunately, when you follow that link, there is nothing relevant there providing any more detail, and I can't find anything documenting this behavior in the API's. By saving into ApplicationData::Current->LocalSettings are we safe from being cut off with corrupted or lost data?
Once the minimum has been taken care of, next we'll probably need extras like cursor and window position.
We can get the cursor position with TextBox->SelectionStart, which as far as I can tell, is undocumented in the API of this usage of returning the current cursor position. This seems an easy fit to also store as an int into ApplicationData::Current->LocalSettings.
How can we get, save, and restore the scroll position of the TextBox window?
Now that we've got the extras, how about the hard stuff, like undo history? I'm assuming this is impossible as my question on Stackoverflow on how to access the TextBox's undo facility has gotten no answers. Nonetheless, it does seem like a poor user-experience if they swap to another app, come back thinking that the app never closed due to the beautiful and seamless restore from termination we implemented, and their undo history has been wiped out.
Is there anything else that would need to be saved for the TextBox to create the ideal user-experience? Am I missing something or is there an easier way to do all this? How would something like Microsoft's Edge Browser handle the complex case where there are dozens of tabs, form inputs, scroll positions, etc. that all need to be saved in 5 seconds?
The App lifecyle document you reference has been updated for Windows 10, but seems to have lost some of the important bits that you are wondering about.
I found an old blog post, Managing app lifecycle so your apps feel "always alive", that seems to be the inspiration for your link.
In the blog post, there is a paragraph towards the end that reads:
Save the right data at the right time
Always save important data incrementally throughout the life of your app. Because your app has only up to five seconds to run suspending event handler code, you need to ensure that your important app data has been saved to persistent storage by the time it is suspended.
There are two types of data for you to manage as you write your app: session data and user data. Session data is temporary data that is relevant to the user’s current experience in your app. For example, the current stock the user is viewing, the current page the user is reading in an eBook or the scroll position in a long list of items. User data is persistent and must always be accessible to the user, no matter what. For example, an in-progress document that the user is typing, a photo that was taken in the app or the user’s progress in your game.
Given the above, I'll attempt to answer your questions:
how do you save and then restore a simple TextBox for resume from termination?
As the end user is typing in the TextBox, the app saves the contents in the background to the data store. To borrow from how word processing software works, you auto-save the textbox "document". I would consider the textbox content to be what the blog post above describes as "user data". Since the save is done outside of suspension, there is no time window to worry about.
When your app resumes from termination, it checks the data store and loads any data into the textbox.
Once the minimum has been taken care of, next we'll probably need extras like cursor and window position.
I would consider these items "session data" and would save them during suspension. After all there is no need to keep track of this info while the app is active. The user doesn't care where the cursor was 10 minutes ago when he started typing - he only cares about the cursor position at the time of suspension.
how about the hard stuff, like undo history?
I would consider undo history to be "user data" and would save it while it is happening (outside of suspension). In other words, as the user types in content, your app should be saving the information necessary to undo.
We've got a strange problem that is very hard to troubleshoot. We are looking for some assistance on methods that might help us troubleshoot this problem. We use memcache and thinksphinx. Recently we moved to a new server and suddenly elements on the pages are showing up missing.
So for instance, our home page has news items and latest files added. In one case I see that we are missing the last 2 news items. My developer checks and sees its there. 10 minutes later he checks and see all the news items missing. Check again 15 minutes later and missing 3 items.
We were able to notice that on the server move we had memcache set at 2mb, so we moved it up to 1gb. It looked like everything was fixed. However, now we are seeing similar inconsistencies when people are searching. Users will report problems, I will see them, send them to my developer and he sees different results. We both refresh and see something else.
We are able to realize this is somehow related to memcache and/or our thinkingsphinx, because when we clear and rebuild, everything acts normal.
My only assumption is that at some point we run out of memory in memcache, but it makes no sense that only certain data would not be shown.
Can anyone give any advice?
Thanks,
Will
Backstory
This afternoon, I replied to a text from my girlfriend, then apparently neglected to sleep my phone before putting it back in my pocket. When I pulled it back out a few minutes later, my phone had decided to hit "Edit->Clear All" on the conversation, vaporizing two years and two phones worth of SMS history with her. While I have a backup of the phone, it's close to three weeks old at this point, and there's enough solid discussion that I'd like to reconstruct; I've already grabbed a copy of sms.db, but I think the method I used vacuumed the file, so there are no soft-deleted texts in it.
Meat of the Question
I have a three-week old backup of my sms.db, and have access to date copy of her sms.db. I'd like to
export the texts she has but I don't (easy, at least to CSV)
change the "perspective" info (the address field and the sent/received/deleted/unknown field), keeping the timestamp and text
import/merge these new entries into my old sms.db backup
merge this updated backup with my current sms.db (optional/there seems to be an online utility for that)
I don't really know SQL but would be willing to learn; the problem I have is that from what I understand, the tables within sms.db have become more interdependent over the OS's lifespan, and the triggers now call C functions that don't exist outside the phone, so it's not a simple matter of calling a single trigger on multiple entries. Does anyone know of any ways to work around this complexity, or even better, any utilities that have already figured out how to import individual entries into sms.db?
Edit:
I've been examining sms.db, and from what I can tell, the relationships are pretty straightforward:
for message, I need to mostly make sure that the ROWID of any added messages are higher than the current highest ROWID
msg_group holds the message:ROWID of the last message for each contact; I can lookup the correct address within group_member; group_member:group_id corresponds with msg_group:ROWID
msg_group has a hash column; this will probably be the hardest thing to update, since I'm not immediately sure what it's updating, or what hash to use
sqlite_sequencedoesn't seem like it's quite up-to-date; its entries seem to all be smaller than the actual ROWIDs, but I assume this means I won't have to mess with it very much.
I'm not really sure that I'll be able to change msg_pieces at all: it's the table in charge of handling the multiple parts of an MMS message.
Hey did you get this sorted out? if you haven't I suggest taking a look at http://smsmerge.homedns.org/
I have been in a similar position as you have, but I was lucky and had a more recent backup than that.
Let me know if you need a hand with it