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Delphi Map File Access Violation


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. Thanks Per, just the kind of info I was looking for. Join 37 other followers Recent Posts Размышляя о сотворенииМира Пару слов о таком явлении как "БЕЛЫЕПСЫ" И кто Microsoft ПОСЛЕТАКОГО?! Newer Delphi versions also have other methods to find HInstance. have a peek here

If you access, in a destructor, a field that has not been initialised, and do anything other than call Free on it, then you will get an exception like this. Could some please straighten this out, or point me to a Internet resource that does? FastMM is great at of making this kind of problems happen more consistently (and finding their source). So in your case, the address to look for in the .MAP file would be $5A3BD2 - $400000 - $1000 = $1A2BD2 IHTH - Per Frederik Slijkerman Delphi Developer 2005-01-13 http://stackoverflow.com/questions/4536394/how-do-i-debug-an-access-violation-in-the-field

Delphi Access Violation At Address

These pairs are sorted by the name of the symbols. The GetModuleHandle API function will return the actual address - the handle is actually a pointer. Both list segment,function start address and function name.

There is not way for me to track where the error occured only by the AV report and the MAP file. delphi debugging exception-handling stack share|improve this question asked Feb 17 '11 at 18:27 Edwin Yip 1,62612453 add a comment| 2 Answers 2 active oldest votes up vote 2 down vote accepted The start of the code image within the loaded PE is almost invariably at offset $1000, though, so usually you can go from run-time address via YourAddress - (LoadAddress + $1000) If you want to get involved, click one of these buttons!

I know for example that I need to dig up my old assembly book to see in which CPU registers does the stack information reside and how to compute function addresses Madexcept Then you use all this to look stuff up in the map file. (And you probably need to compile with stack frames and no optimisation, otherwise you'll miss bits of the Taxiing with one engine: Is engine #1 always used or do they switch? So I definetly DO NEED a third party tool / units. 0 How your wiki can always stay up-to-date Promoted by Quip, Inc Quip doubles as a “living” wiki and a

Frederik -- Best regards, Frederik Slijkerman "Chris" writes Quote Could not find any debugging newsgroup for Delphi, so hope this one is OK.... Hi Robert, Please explain this to me. Privacy policy About RAD Studio Disclaimers Help Feedback (QP, email) Board index » delphi » How to use MAP file to locate error line? The best option I think is to run application in different test cases to make it generating as much AV-errors as you only can provoke and then collect all error messages

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  2. Buddy Offline 1# A A A Post at 2009-7-8 01:07 Show author Convert access violation address to line no. (ַͨҳк) Convert access violation address to line no.
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That's all, sounds logic. (BTW, I found this out myself, so there is a slight chance that I'm all wrong. http://www.delphigroups.info/2/6/837737.html Note that DLLs may not actually load at their preferred address because something else could already be occupying that space. Delphi Access Violation At Address Then switch on detailed map file in the Project|Options dialog Linker tab. 3. You can check which value it has by using the freeware tool "PEProwse Pro".

Register ESP is the stack pointer. navigate here He's perfectly justified in hiding the filename, it's not going to do us any good. Any info might give us a clue to help you further. –Jeroen Wiert Pluimers Dec 27 '10 at 8:22 2 +1 also, this is a good question. –David Heffernan Dec This sort of error almost certainly means you attempted to dereference a nil pointer even if you can't find one.

So I'd have to reload the original code. If a access violation address was 00437575 then Offset = 400000 + 1000 = 401000 and Map file address = 00437575 - 401000 = 36575. 2. Note that DLLs may not actually load at their preferred address because something else could already be occupying that space. Check This Out in Delphi Map file Hot Network Questions Why are Zygote and Whatsapp asking for root?

This way the 2nd item in that stack trace should be the line of code where you did the crashing string assignment. 0 LVL 12 Overall: Level 12 Delphi 5 Access Violation with TfileStream I hate access violations 3. Delphi Pages - Archive - Top - Contact Us Powered by vBulletin Version 3.8.8Copyright ©2000 - 2017, vBulletin Solutions, Inc.

But it's simply not reliably this way. >So I definetly DO NEED a third party tool / units.

It also doesn't (automatically) catch thread exceptions. Any other recommendations? You'll also find the image base address there. LVL 12 Overall: Level 12 Delphi 5 Message Expert Comment by:andrewjb ID: 125431552004-11-10 Correct - you need to log both the AV address and the call stack.

DB? In the current case, my user gets an AV like "Access violation at address 005A3BD2 in module 'ZZZ.exe'" I think you will have to combine this address with the value that Well, you can do it on your own, too, of course. this contact form HTTPRIO with Terminal Services - Any known issues?3.

have a look at the JclDebug functions and the wizard that goes with them. Regards Chris OBones Delphi Developer 2005-01-13 09:11:02 PM Re:How to use MAP file to locate error line? Access Violation (IDE only), not in standalone running of .exe file 10. From the MAP file and AV instruction address how can I find the line number responsible for the error and maybe the name of the variable not initilized???

So, as you can see, having just the crashing address doesn't help much. For example, when your application crashes (for example, due to an access violation), you can use the resulting address to locate the module (method) where the application crashed. First you need to create map file for project as follows: 1. I've never had to deal with this kind of problem.

As you've noticed yourself, this address is not inside of your own unit. if the AV map file address is36575 the line no would be 367 given the following line in the map file for 'Line numbers for Unit1(Unit1.pas)': 366 0001:00036564367 0001:00036570368 0001:00036578370 0001:000365CB Can anyone explain how to use the MAP file, that I generate for my EXE to locate a source code line? A map file will be generated with the same name as the project.exe e.g.