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Delphi Access Violation At Address Read Of Address

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When I ran the executable outside of the debugger, many features continued to function properly, but the RS232 communication stops dead. The communication runs successfully for a while, with several messages sent and received, and then suddenly stops. Well, newbies likes to pass data (especially String) between exe and DLL, without caring much about two different memory managers in modules. Why shouldn’t I use Unicode characters to simulate typographic styles (such as small caps or script)? check over here

Applications of complex numbers to solve non-complex problems How much leverage do commerial pilots have on cruise speed? Find all posts by helenchu #10 07-09-2002, 07:48 PM figueroamar Senior Member Join Date: Jun 2001 Posts: 198 RE: not frmIdentify fault! Lib1 := LoadLibrary('MyDll.dll'); // one piece of code loads DLL. Not the answer you're looking for?

Delphi Access Violation At Address Read Of Address

asked 3 years ago viewed 1777 times active 3 years ago Related 0Generating a list of events in a Delphi/BCB Project1Handle access violation exception in C++ Builder?0BCB 6.0 “raised exception class Read of address 00000004'.-// Код первой формы: Delphi1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 If so: can there be an invalid index here? The "write" means that the exception occurred during writing, the "read" means that, well, the problem while reading (quite obvious, isn't it?).

Read of address 00000000ґ. Use '' instead of '/'. 2. Maybe i or j are negative or too large for the array? –Gregor Brandt Aug 25 '13 at 13:20 add a comment| 1 Answer 1 active oldest votes up vote 1 Roughly speaking, program uses 3 "types" of memory: area for global variables, the stack and the heap.

All help with be appreciated. Access Violation At Address In Module Delphi LaTeX resume, in classic style, templated to avoid publishing my private info Why is ammonium a weak acid if ammonia is a weak base? If you are getting EAccessViolation while running under debugger: Then you should just click "Break" (it is called "Ok" in older Delphi's versions) and the debugger will point you to source Hello, I took your advice and declared the frmIdentify locally, however, it has nothing to do with that.

There was nothing sinister going on, like the memory manager I had suspected. Why the pipe command "l | grep "1" " get the wrong result? And the last hint comes from ZZZ. The code the failure occurs at seems relatively innocuous, but the project is on the larger side.

Access Violation At Address In Module Delphi

If you know how to fix it, please help. As a result, I have not yet been able to distill this down to an easy to reproduce condition, although I can make some general observations. Delphi Access Violation At Address Read Of Address Thanks a bunch if recs.Count > 0 then begin try DataModule1.ADOQuery1.Close; DataModule1.ADOQuery1.SQL.Clear; field := recs.Fields.Item(recs.TableDesc.FieldName[4]); for i := 0 to recs.Count -1 do begin strNum[i] := field.ValueAsString; DataModule1.ADOQuery1.SQL.Add('select * from myView How To Fix Access Violation At Address share|improve this answer answered Apr 27 '10 at 17:08 Chris Thornton 12.8k32452 That won't cause an access violation for accessing a simple variable. –Loren Pechtel Apr 27 '10 at

What is an asymmetric wheel and why would you use it? check my blog Para facilitar, tente determinar onde o erro estб ocorrendo. HTML код Выкл. Быстрый переход Панель управления Персональные сообщения Подписки Кто на форуме Поиск на форуме Главная страница форума Все о Delphi [ "Начинающим" ] Partially, we already talked about such situations (like silent stack corruption), but in the next time we'll be specifically focused on them and will consider what can we do to catch

Find all posts by andyho #5 07-09-2002, 12:49 PM figueroamar Senior Member Join Date: Jun 2001 Posts: 198 RE: tried your code, didn't work either :( Hi, If Today I want to discuss it, its reasons and how to deal with it. Juggling things around and accessing it later also was throwing exceptions. **edit - actually, it was the TListBox that was being cleared. this content c).

Itґs wrong since you create the form there. River_Forest Brian Hamilton ... Find all posts by figueroamar #6 07-09-2002, 12:53 PM figueroamar Senior Member Join Date: Jun 2001 Posts: 198 RE: tried your code, didn't work either :( Sorry ,

Sir Richard Abramson Регистрация: 05.04.2008 Сообщения: 5,407 Версия Delphi: XE10 Репутация: выкл Вызываешь что-то с несозданного объекта. Весь твой код смотреть лень, но скорее всего где-то конструктор не вызван. __________________

There can be no function named 'MyProc' Proc; // Proc can be = nil -> there will be an Access Violation ... I really want to understand what this message means, and how can I solve it when it shows up again. Especially, if you do a manual allocate or free of objects somewhere in your program. Write of address ..........' Process stopped.

oops! –Chris Thornton Apr 27 '10 at 20:44 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook The code is in C++ so, this seemed like a step backwards, but I was willing to try, to see if perhaps the memory manager was releasing memory out from under In the second case you should search for bad guy, who released the object, but doesn't clear the variable itself. have a peek at these guys It is provided here only for convenience - that way you do not have to search it somewhere else.

One thing to make you very depressed was that you have carefully checked your codes many times while nothing found wrong. --------------------------- Information --------------------------- Project app.exe faulted with message: 'access violation You are calling LoadFromFile() on an uninitialized pointer. Interestingly, that was cool because the array was declared BELOW the pointer, but he "underflowed" by using element [0] when the array was declared [1..5]. So what exactly should we do with access violation?

You should just examine a function's documentation to figure out what you did wrong. AVs near address 00000000 usually mean a nil pointer is being accessed. When I restart the tool the RS232 communication works again, but always stops after the same number of bytes have been sent and received. Let me know if you have encountered this, and have any other suggestions what I can try.

Read of address 00000000'. A blue, white and red maze WEATHER-resistant GFCI's required in bathrooms? Process stopped. I won't cover this issue here, as it might take a long time.

The code where the failure occurred was using Strings. Best way to change site IP address - from the end user perspective? for X := 1 to Length(List) do // wrong!