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Delphi Access Violation At Address 00000

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If the problem goes away, look at the vars declared above where you have it now - you may find something interesting, such as an array that is growing past its Personal loan to renovate my mother's home How to align a set of very long equations How can we get our son to stop sleeping in our bed? Apr 27 '10 at 17:26 @Loren - thanks, yes you're right. GetMem() operates on bytes but GetComputetName() operates on characters, and in this case SizeOf (Char) is 2 bytes. Check This Out

I voted it back to zero. –Loren Pechtel Dec 27 '10 at 6:25 3 +1 to teach the person who downvoted a lesson :-> (and to give Robert some mental Some part of your code is writing in memory it shouldn't or freeing while it shouldn't and that by accident it results in AV's when accessing that specific local variable? You have 79 questions here, and had problems providing info in most. –Ken White Aug 26 '11 at 0:39 I've done everything what you sad (I cannot understand what more hot questions question feed lang-pascal about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation

Delphi Access Violation At Address 00000

Use the CPU view to see what registers are used to access the global var, and then work backward from there to see where that/those registers go awry. FOnCustomEvent(Self); end; If the error is in a third party component, and you can track the offending code down, use an empty event handler to prevent the AV. How can I slow down rsync? Find and solve customer issues on production systems Use SmartInspect to identify and find errors and customer issues during development and after you shipped your software to end-users.

Also there is a compiler command line switch to find an error by address. the AV error was caused by trying to access the progressbar on the form that has not yet been created. –user741875 Jun 2 '11 at 12:49 5 +1 for subtly Having done that you know which object is nil and from there it is usually not too hard to work out what is going on. How To Fix Access Violation At Address The stack is used for allocating memory for local variables (which are declared in some function or procedure) and auxiliary data (such as return addresses or exception handlers).

Any suggestions for a new writer? Is the Nintendo network ban tied to NNID or the console? Regarding the code itself, there are issues with it: Most importantly, you are not allocating enough memory for the buffer. What's the purpose of the same page tool?

share|improve this answer answered Apr 27 '10 at 17:11 dthorpe 27.1k34799 add a comment| up vote 0 down vote Move MyCounter up to the top of the var list, and see Delphi 7 Find Error Lithium Battery Protection Circuit - Why are there two MOSFETs in series, reversed? The best you can do is to guarantee, that such things can not happen. He's perfectly justified in hiding the filename, it's not going to do us any good.

Access Violation At Address In Module Read Of Address Delphi

You should just examine a function's documentation to figure out what you did wrong. Request customer log files or monitor production systems via TCP/IP to provide faster and better solutions and workarounds to users. Delphi Access Violation At Address 00000 How could Talia Winters help the rogue telepaths against Bester? Delphi Find Error If that doesn't solve it, you may may need an exception-logging tool like madExcept mentioned by DavidH.

Read of address 00000008. his comment is here I am storing in TTreeView Node.Data property some data for each node. This attempt to read NULL will fail, and generate the message you have received. I'm totally stumped. Madexcept

If you are in doubt - place you code in synchronize or guard it by critical section, when working with shared variables. Get up out of your modern office furniture and take a nap or go outside. Enable range checking {$R+} in your application. this contact form Usually, you should catch errors of this sort at development/testing stage by using "Range Check Errors" option.

Global exception handling, error logging and a robust integration with exception reporting tools are just a few of SmartInspect's features you don't want to miss! Access Violation At Address Windows 7 delphi variables access-violation share|improve this question asked Apr 27 '10 at 17:03 J... 17.6k33576 Can you give the exact text of the Access Violation error message, including the addresses? I keep on repeating that too. –Rudy Velthuis Aug 26 '11 at 7:10 When a very simple instruction (Like I := 0) crash...

And as I sad, a strange thing that it works in a new project, not in mine.

How do I prevent flight in a cyberpunk future? You're using something before it's ever been created, most likely, or after it's been FreeAndNil()'d. Sometimes, however, there can be cases when XXX do not hold any meaningful value. Jcldebug Thanks to everyone for good ideas.

Thirdly, I've found tools like Pascal Analyzer from Peganza, and the audits-and-metrics feature in some editions of Delphi, can help you find areas of your code that have problems. The call to DoWork will overwrite data of ClientCommunication as well. How does one evaluate a "locomotive" (rainbow card) in "Ticket to Ride?" Was Judea as desertified 2000 years ago as it is now? http://chatflow.net/access-violation/delphi-access-violation-at-address-read-of-address.html What you're looking for is probably some place where your program calls a function through a function pointer, but that pointer is null.

We typically think of the instructions at an address reading and writing from memory at certain addresses. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed