Error Delphi Access Violation At Address
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Delphi Access Violation At Address In Module Read Of Address
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Delphi Access Violation At Address 00000
Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Debugging Access Violation access violation at address 00000 read of address 00000 errors? up vote 15 down vote favorite 7 What tips can you share to 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 how to fix access violation at address make the required changes to try and stop/fix them. A example is a personal project I am working on now. I 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
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Access Violation At Address In Module Read Of Address
Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes http://stackoverflow.com/questions/6214458/debugging-access-violation-errors a minute: Sign up Troubleshooting Access Violation at Address. Read of Address 00000000 [closed] up vote -2 down vote favorite The same version of Delphi 7 Code has been deployed at computers throughout our organization. Each time user A accesses record Z on computer F1, the following error is displayed: Access violation at address 00642E83 in module 'foo.exe'. Read of address 00000000 http://stackoverflow.com/questions/15798281/troubleshooting-access-violation-at-address-read-of-address-00000000 I've followed the same steps on my own computer with my user, and on another computer with another person's user, and have been unable to replicate it (and hence, can't debug...). Additional Info as requested (not sure how helpful this will be) Record Z is a row in an Interbase DB holding contact and call history of people who have called in. All the computers in our org use the same build of Windows 7. So when... User B accesses record Z on computer F2 there is no error. User C accesses record Z on computer F3 there is no error. User A accesses record Z on computer F4 there is no error. User A accesses record Z on computer F1 (after reboot) there is the same error at the same addresses mentioned. It appears that computer F1 is the culprit. However, at this point, I'm not sure how to troubleshoot further. Any suggestions? delphi delphi-7 access-violation share|improve this question edited Apr 3 '13 at 21:46 asked Apr 3 '13 at 21:16 AU_Outpost 901113 closed as too localized by Ken White, ko
Swedish Traditional Chinese Turkish | Location All Other RegionsASEANAustralia/New ZealandBeneluxD-A-CHGreater ChinaLatin AmericaNordicTaiwanUK and IrelandUS and CaribbeanCountriesBrazilCanadaFranceIndiaItalyJapanKorea (South)Russian FederationSpain http://support.embarcadero.com/article/35786 Embarcadero Home Home Support Offerings Submit Case Resources Downloads http://eurekalog.blogspot.com/2009/05/access-violation-in-details_12.html Contact Us Printer-friendly Support KB » Delphi » Installation & Registration Show All [All] How to resolve the error message "Access violation at address 0A6C77BE in module htmlhelp290.bpl Read of address 00000018" ? Abstract: How to resolve the access violation error message "Access violation at address 0A6C77BE in module htmlhelp290.bpl Read of address 00000018" ? Product Name: Delphi 2005 Product Component: N/A Platform/OS Version: WindowsDescription:When starting Delphi, the error message "Access violation at address 0A6C77BE in module htmlhelp290.bpl Read of address 00000018" is seen.Answer/Solution: When Delphi 2005 is access violation at installed after beta versions of Microsoft NET Framework Version 2.0 or Visual Studio 2005 is installed, you may receive the error message "Access violation at address 0A6C77BE in module htmlhelp290.bpl Read of address 00000018" when starting Delphi 2005.In order to fix this, please follow the steps below:1) Open up the Registry Editor from the Windows Start Run menu with regedit.2) Navigate to the registry key, HKEY_CLASSES_ROOT\AppID\dexplore.exe3) Replace the string value data of the key named 'AppID' with the value of {4A79114D-19E4-11d3-B86B-00C04F79F802} Hide image Author: Chee Wee Chua Translationsjphtmlhelp290.bpl の Access violationエラーについて Copyright© 1994 - 2013 Embarcadero Technologies, Inc. All rights reserved. Site Map Installation & Registration Annual Agreements Single Incident Supported Versions Installation & Registration Product Support Single Incident Discussion Forums Documentation Developer Network Bugs & Suggestions Examples Audio Audio & Video Video Registered User Downloads Maintenance Portal Free Trials Beta Programs
contain not very accurate phrases. What is an Access Violation Every computer program uses memory for running (*). Memory is consumed by every variable in your program. It can be form, component, object, array, record, string or simple integer. Memory can be allocated automatically for certain types of variables (such as integer or static arrays), the other types require manual control of memory (for example, dynamic arrays). Essentially, from the point of operating system, each variable is characterized by its address (i.e. - location) and size. Roughly speaking, program uses 3 "types" of memory: area for global variables, the stack and the heap. Memory for global variables is allocated by OS loader when executable module is loading and it is freed when module is unloading. Global variables are those, which declared outside of class or any routine. 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). The heap is used for storing dynamic data. Note, that for variables of dynamic types (such as dynamic arrays, strings, objects or components) - though the variable itself is stored in global area or stack, but its data is always allocated on the heap and it (often) require manual control. Regardless of who allocates memory for the variable (you, manually or the compiler, automatically), memory for each variable must be allocated before its using, and later (when the variable is no longer needed) it should be freed. Sometimes there can be a situation, where your application trying to get access to certain memory location, which wasn't allocated or was already released - due to bugs in your code. When such things happens - the CPU raises an exception of class EAccessViolation. The usual text for this error is as follows: "Access violation at address XXX in module 'YYY'. Write/read of address ZZZ". Though there is the one simple reason for this kind of error, the real situations for it can be very different. Looking for source code line of Access Violation So, what should you do with access violation? Well, first you should try to identificate a source line in your code, where it appears. 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 line immediately. Additionally you can take a look at call stack by choosing View/Debug Windows/Call stack from Delphi's