Fatal error exception code c0000005 foxpro

C0000005 error and how to troubleshoot them

This article introduces a C0000005 error and offers troubleshooting suggestions.

Original product version: В Visual FoxPro
Original KB number: В 2722492

Symptoms

You are running Visual FoxPro interactive development environment or a custom VFP executable. The application closes and reports this error:

C0000005 Fatal exception

Cause

A C0000005 error is memory error. Specifically, a C0000005 error is an access violation error caused by a buffer overrun.

Resolution

Many scenarios may cause Visual FoxPro to report a C0000005 error. The most efficient method of determining the root cause is to get a memory dump on the Visual FoxPro process when the error occurs and then examine the stack for the faulting module. For example, if a printer driver module is on the top of the stack, one should try updating the printer driver or trying a different driver. If a third party OCX appears as the faulting module, then you should check with the developer of that control for an update on compatibility with your version of Visual FoxPro.

Since Visual FoxPro is a 32-bit application, you must use a 32-bit debugger to obtain a memory dump.

To obtain the latest version of debug diag, see Debug Diagnostics Tool v1.2 is now available

These are some generic instructions for obtaining a memory dump for a Visual FoxPro process.

Install it on the machine(s) experiencing the crashes. Double-click DebugDiag.msi and follow the setup wizard. Install DebugDiag to a hard drive with at least 200 megs free.

To configure DebugDiag:

1. Open DebugDiag. The ‘Select Rule Type’ dialog should open. Select CRASH and then click next.
2. On the ‘Select Target Type’ dialog, select ‘A specific process’ and then click ‘Next’.
3. Type the name of your .EXE into the ‘Selected Process’ textbox or select it from the list. If typing it in, be careful to spell the .EXE name correctly. Do NOT check the ‘This process instance only’ box — we want the rule in effect for all instances, until we capture a dump. Click ‘Next’ when done.
4. On the ‘Advanced Configuration’ dialog, set the ‘Maximum Userdump Limit’ to 25, then click the ‘Exceptions’ button.
5. Click ‘Add Exception’
6. Select C0000005 in the list, then set the ‘Action Type’ to ‘Full Userdump’ and the ‘Action Limit’ to 25
7. Click ‘OK’, then ‘Save and Close’ and finally click ‘Next’
8. On the next screen, please leave the rule name and path to store the dumps as-is, then click ‘Next’.
9. On the ‘Rule Complete’ screen, select ‘Activate the rule now’ and click FINISH. Now when a crash occurs in the application DebugDiag should automatically create dump files. The Userdump Count will also be incremented inside the DebugDiag IDE each time a dump for this rule is created. NOTE: It is not necessary to keep the DebugDiag window open; the dump monitor actually runs as a service and will capture the dump even if DebugDiag is closed.

Once the crash collection is complete, you can disable the rule we made earlier by doing this:

1. Open DebugDiag.
2. In the RULES tab, highlight our rule and then right-click and select ‘DISABLE RULE’

Источник

Fatal error: Exception code=C0000005 and VFP9

I have an application that works fine (was developed in VFP9). However, once in a while, when I install my application in a new customer/computer, I have the message:

Fatal error: Exception code=C0000005

Right at the beginning of the application (it doesn’t even show the foxpro screen or anything else, just the message and then the program aborts). I checked again virus, chkdsk, etc. and nothing works.

Sometimes it occurs in XP, sometimes W7. Some of those machines are brand new. The same disk that I use to install my app in one machine that works fine, is being used in another machine that occasionally doesn’t work.

Thanks in advance.

This has nothing to do with the computer. It might be a printer driver, ban index, incompatible code page or system language regional setting.

Try to put breakpoints and find out where exactly it is doing so.

Completely reindexing the files might help. Deleting corrupted foxuser.dbf and foxuser.fpt might also help. Back them up first.

ASKER CERTIFIED SOLUTION

This behavior occurs on computers where are some components (DLLs) which do not match your VFP version. Look e.g. into folder C:Program Files (x86)Common Filesmicrosoft sharedVFP or even in C:WindowsSystem32 etc.

It should not happen if you place all necessary DLLs into the app folder. The list of necessary files is here: http://fox.wikis.com/wc.dll?Wiki

If you provide your foxuser.dbf with the setup, because it contains some settings, it could easily cause the C5 errors, that’s true. Either provide no foxuser.dbf and let the exe create one, or even include a config.fpw into compilation, which prevents creation of a foxuser.dbf via the config.fpw line RESOURCE=OFF

Especially when installing to program files, no write access is given and no foxuser.dbf can be created. That would not cause a C5 error, though.

What runtime files do you include in your setup?
As you mentioned this happening on brand new computers, you may rely on something installed with other software, which you would perhaps simply need to add to your setup.

Thanks for your answers:

To CaptainCyril : your sugestion can not be used («. reindexing the files might help. Deleting corrupted foxuser.dbf and foxuser.fpt. «). My app doesn’t work with DBF tables, only with SQL (Express 2008) tables and I already install my app without Foxuser.* files.

To Gary2Seven: «. check the error log, vfp9err.log. «, regretfully, only shows the error, plus date, hour and nothing else. Don’t even the name of the program that made the first call. Not big help on this file. In regards to TRY and CATCH, I am trying to use that, but so far I can not «catch» that elusive error.

To pcelba: «. place all necessary DLLs into the app folder. «, Already try that and it didn’t work.

Still to try: replace printer driver , and find out if my app is expecting some «hidden» DLL from Foxpro ( GDIPLUS. etc.). I would say that out of 30 installations, one of them has de C5 error, the rest of computers works fine (keep in mind that it is same software without changes). I «googled» C5 error and there are many possible causes (perhaps hundreds), I can not try all of the possible solutions. The only possible solution is keep trying with TRY and CATCH. I was thinking that perhaps there is a more efficient way to solve this problem.

Can you put breakpoints or milestones?

For example: Connecting to database, Writing log, deleting temp files, .
This way you can know what the software is doing to find the source of the problem. So instead of hundreds of problems you can narrow it down to 2 or 3.

In my last C5 error, I managed to know that it was an EditBox with Chinese characters on an English-US OS language that caused the application to crash.

Again: What runtime fiels DO you include in your setup?
If you don’t include the C runtime you depend on whatever is already on the system.
If you don’t include the gdiplus.dll you depend on what is already on the system.
And that can crash.

You are explicitly allowed and it is explicitly recommended you install not only the core VFP runtime vfp9r.dll, but also all the related DLLs.

Pavel has pointed you to a runtime installer suite of which you can pick the appropriate one having the right SP revision. Just see what Version() says, the last number is what is meant as the Revision in the link pavel gave you.

As you don’t install foxuser.dbf, it’s recommendable you suppress it’s generation, too. Write a textfile with RESOURCE=OFF as it’s only line, name it config.fpw, include it to the project in text or other files and right click on it to untick the exclude context menu item. If that is unticked the file is not excluded from compilation into the final EXE. If you then build you have an exe that won’t try to create a foxuser.dbf file and if that is by chance the reason you get your c5 error in some cases, that would resolve it.

In the normal case the OS restricts writing the foxuser.dbf right besides the EXE, if you install into program files, but it is instead written into a user directory. If that is also suppressed by group policies eg, then that could cause a c5. That would also explain, why it doesn’t happen always and only at some clients.

PS: Yes, there are many reasons for a C5, but very few for a C5 right at the start, even before any of your code lines run. Put a messagebox as your fist line and see if that executes. If the C5 error is before, the only reasons are runtime mismatch or a problem in foxuser.dbf usage or creation. There is nothing else done, before your code starts, than loading the runtime(s) and creating/using foxuser.dbf.

Thank you again for answers

I will try your suggestions. It will take some time before I have the answer, I can not reproduce the problem in my computers, and access to my customers’ computers is hard (they are in another countries, the only way is remote desktop), As soon as I have something I will let you know.

Every discussion about C000005 error in FoxPro is worth to read as this unhandled exception can have thousands of possible reasons. and this knows every Visual FoxPro developer.

All what was written in our posts is true and could help others to understand the foggy C000005 reasons. Unfortunately, grijalbo stopped responding and did not post the final resolution.

But are you sure just this final resolution would tell others what should they fix in their own applications to avoid C0000005 error? Not at all but others can try what we have recommended during the three days in the discussion.

So we have condensed our decades accumulated knowledge into three days and you now simply say «delete everything».

OTOH, it could also seem we are just points collectors. So in such case select the post hppps:a#41696557 as the answer please but don’t delete this question.

I second pcelba.

Keep the question. Don’t give us points if that satisfies you eenookami. Your words should be directed to Microsoft for their vague handling of C000005 errors.

Dear all Fox Users
my app appear to those error c5

i try to trap step by step, error appear because one of my table missing field in my grid.

in my programming error appear when the routing program «thisform.grid1.refresh»

i am no need reinstall my VFP9, DLL or anything

We cannot help as we don’t know your code, your VFP version, your conditions. Just read all the posts here and try to implement all hints.

MSDN Archive never more offers VFP Runtime download so here is the working link for VFP runtime downloads: http://www.foxpert.com/download/runtime.html

Just to add once more: C5 is just a headline. It categorizes this as an error the VFP runtime is not able to handle itself, no VFP error that has a specific error number, no specific reason for it. So don’t think when you find someone stating he found the reason, the same solution applies to you. You get a good hint in vfp9err.log stating the line which last executed. That can be a hint about a corrupt file like dbf or frx, but the error rarely is that line itself, it just has the bad luck of acting on something broken. Could be using a method of an object still in memory, though it should have released 100 lines of code back in some other class that ran before.

C5 error even is a C++ concept, not a VFP one, it’s access violation accessing invalid memory buffer, for any reason, eg a pointer in a dbf pointing to a non-existing offset of an FPT file. A memory address an object instance once was existing — anything.

You can’t suppress this or catch it in a try..catch. Some reasons are the VFP runtime not expecting certain corruption in files, no pointers to non-existing FPT file portions, for example. It’s just a made up example anyway, but all you can do is verify what’s been acted with the line of code, so this is just a starting point for an investigation of the involved PRG or SCX or VCX, involved open tables and reports and much more code and files up to the point of everything that ran previously and led to the situation. Even simpler errors the ones having a native VFP error number and a distinct simple explanation often need more than fixing that single line of code.

If you never debugged code, a C5 is a good reason to start. Once you know where it happens reproducible set a breakpoint for example in some click leading there and go through what happens step by step. And don’t wait for the C5 to happen, the seed of the error is typically planted earlier, it might even already exist when you start into single-step debugging. It can be a buffered record that is just committed when a dbf is closed because another one is opened, and then you should not only suspect the newly opened dbf. So this really needs experience of debugging in general, which you never get, if this is the first hard error challenging your bug fixing.

Know your FoxPro, use coverage logging to see much more than just the last few lines of code executing up to the C5 error incident. Have a health check of all files involved, maybe even the whole dbf, your project and also foxuser.dbf resource files. Even the intelliisense foxcode.dbf once caused a reproducible error. And now please, don’t check your foxcode.dbf, just because I mentioned it last.

You examine such things with detective skills, switch components, even the whole computer, to see if anything on that client and driver or OS issue catches you.

Источник

Fatal error exception code c0000005 foxpro

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Answered by:

Question

I have modified an old FoxPro application in VFP SP2 and the final executable(.exe) works fine in my development system. Even in debug mode the application is fine. But when i try running the same build along with the supporting DLLs (got this info after googling) in another system it throws out these errors and the program terminates. However these errors are intermittent.

These are the DLLs i used:

VFP9Rerr.log

Answers

C00000005 is not a VFP error but a Windows OS error and it can be issued for many reasons.

People have there own pet reasons as to why it happens.

Normally, it is due to an error in the program creating a condition that the OS cannot recover from.

I have found that the specific Release of objects by issuing the command

Release obj1, obj2, etc.

certainly helps to reduce these errors. So if you have issued the command CreateObject() then you certainly need to specifically release those objects.

Also, if you have invoked external procedures contained in DLLs and APPs, you need to do the specified Close routines in order that the DLL/APP can release its own objects.

If you do a search on the web site and of the web in general for C00000005, you will get a lot more suggestions as to the cause.

Источник

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