Access Violation Error Delphi
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Delphi Access Violation At Address In Module Read Of Address
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Access Violation Error Message
4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Debugging Access Violation errors? up vote 15 down vote favorite 7 What tips can you share to access violation error windows 7 help locate and fix access violations when writing applications in Delphi? I believe access violations are usually caused by trying to access something in memory that has not yet been created such as an Object etc? I find it hard to identify what triggers the access violations and then where to make the required changes to try and stop/fix them. A example is a personal project I am working on now. I access violation error received from tftp server am storing in TTreeView Node.Data property some data for each node. Nodes can be multiple selected and exported (the export iterates through each selected node and saves specific data to a text file - the information saved to the text file is what is stored in the nodes.data). Files can also be imported into the Treeview (saving the contents of the text files into the node.data). The issue in that example is if I import files into the Treeview and then export them, it works perfect. However if I add a node at runtime and export them I get: "Access Violation at address 00405772 in module 'Project1.exe'. Read of address 00000388." My thoughts on that must be the way I am assigning the data to created nodes, maybe differently to the way I assign it when they are imported, but it all looks ok to me. The access violation only shows up when exporting, and this never happens with imported files. I am NOT looking for a fix to the above example, but mainly advice/tips how to find and fix such type of errors. I don't often get access violations, but when I do they are really hard to track down and fix. So advice and tips would be very useful. delphi access-violation sh
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Access Violation Error C++
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Delphi Access Violation At Address 00000
Delphi : Error 'Access violation at address 00536983 in module ' up vote 1 down vote favorite My code : if dataset.IsEmpty then DoSomething(x); When 'if dataset.IsEmpty' runs l get the following error: 'Access violation at address xxxxxxxxx in module abc' http://stackoverflow.com/questions/6214458/debugging-access-violation-errors Why am I getting this error? I don't know the explanation of 'access violation' - can someone please explain this to me and help me avoid this error. Thank you. delphi share|improve this question edited Aug 2 '11 at 6:33 Vector 3,02453177 asked Aug 2 '11 at 2:30 boy 612 2 Check if the dataset is pointing to a valid memory address try something like this if Assigned(dataset) then –RRUZ Aug 2 '11 at 3:01 2 Why did you obfuscate the error http://stackoverflow.com/questions/6906691/delphi-error-access-violation-at-address-00536983-in-module message? What made you think that giving less information would help us answer? Give us the whole message please! In particular I want the bit that says either "read of address" or "write of address" and I want both addresses. –David Heffernan Aug 2 '11 at 7:19 add a comment| 2 Answers 2 active oldest votes up vote 1 down vote See here for an explanation on AV exceptions and how to debug them. The solution could be as simple as checking if dataset is assigned, as RRUZ suggests, but we would never know with this little information. Showing us the exact error message will help to rule out some cases. share|improve this answer answered Aug 2 '11 at 7:28 Lars Truijens 31.2k481109 add a comment| up vote 1 down vote it can be because the dataset is inactive/closed when you try to access it. share|improve this answer answered Oct 31 '12 at 7:28 more2chance 162 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name Email Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service. Not the answer you're looking for? Browse other questions tagged delphi or ask your own question. asked 5 years ago viewed 5505 times active 3 years ago Linked 15 Debugging Access Violation errors? Related 4Delphi Win32 Programming/Access
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