Access Violation At Address Error In Delphi
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Delphi Access Violation At Address In Module Read Of Address
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Access Violation At Address 00000 Read Of Address 00000
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 Delphi, error :“Access violation at address xxxxxxxx. Read of address yyyyyyyy”, at AdoQuery.SQL.Text:=''' up vote -1 down vote favorite 1 "Access violation
How To Fix Access Violation At Address
at address xxxxxxxx. Read of address yyyyyyyy" On this project i have more than 200 procedures like that, but only this procedure gets error (only windows xp).. Procedure than have error : Procedure TfMain.CreateNewDocument(p_money_direction,p_status,p_base:integer); begin With fMain.ADOTemp do Begin SQL.Clear; SQL.Text:='INSERT INTO documents '+ '(document_date,fk_id_status,money_direction,'+ 'paid,addition,saving,fk_id_base,fk_id_user)'+ 'VALUES '+ '(CONVERT(DATE,:pdocument_date,103),:pfk_id_status,'+ ':pmoney_direction,0,0,0,:pfk_id_base,:pfk_id_user)'; Parameters.ParamByName('pdocument_date').Value:=Date; Parameters.ParamByName('pfk_id_status').Value:=p_status; Parameters.ParamByName('pmoney_direction').Value:=p_money_direction; Parameters.ParamByName('pfk_id_base').Value:=p_base; Parameters.ParamByName('pfk_id_user').Value:=fMain.ApplicationVariablers.user_id; ExecSQL; End; end; Error at : SQL.Text:='INSERT INTO documents '+ '(document_date,fk_id_status,money_direction,'+ 'paid,addition,saving,fk_id_base,fk_id_user)'+ 'VALUES '+ '(CONVERT(DATE,:pdocument_date,103),:pfk_id_status,'+ ':pmoney_direction,0,0,0,:pfk_id_base,:pfk_id_user)'; Debuingging process, error at line 1907 : sql delphi share|improve this question edited Nov 18 '13 at 13:23 TLama 53.3k14101168 asked Nov 18 '13 at 12:58 user3004668 3614 Providing the real error message could have helped. Why keep it from us? –David Heffernan Nov 18 '13 at 13:19 @David, it was on the linked screenshot and says something related to Visual C++ runtime... –TLama Nov 18 '13 at 13:22 1 Yo
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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 access violation at address 00000000. read of address 00000000 in toad takes a minute: Sign up How to track down access violation “at address 00000000” up vote 25 down vote favorite 9 I know how to create a .map file to track down access violation errors when the error message includes http://stackoverflow.com/questions/20048406/delphi-error-access-violation-at-address-xxxxxxxx-read-of-address-yyyyyyyy an actual address. But what if the error message says Access violation at address 00000000. Read of address 00000000. Where do I start looking for the cause of this problem... ? delphi share|improve this question asked Feb 10 '10 at 13:21 ObiWanKenobi 4,48173447 1 That reminds me of under Turbo C, "Null pointer assignment" when it is managed in the wrong way... –t0mm13b Feb 10 '10 at 13:30 3 Is it reproducable? If not, add a tool like http://stackoverflow.com/questions/2237028/how-to-track-down-access-violation-at-address-00000000 madExcept and wait for error reports else use the debugger and look at the stack trace. –Lieven Keersmaekers Feb 10 '10 at 13:37 This is from the old Turbo C days, Under the debugger,Add a watch to the pointer variable pointing to location 0, the just executed line when stepping into it, that caused the pointer variable pointing to location 0 change value is the line that messed up. Mostly a pointer error... –t0mm13b Feb 10 '10 at 13:46 Tommie, there could be many pointer variables holding the address value zero. Why set a watch on any of them? Changing one of them would not cause this error. This error occurs when the instruction pointer is zero, but you can't set a watch on that because it changes on every instruction. Which debugger tells you the previous executed line? That debugger would make it trivially easy to solve this problem. –Rob Kennedy Feb 10 '10 at 13:51 3 The answer you accepted isn't telling you much, IMO. –Heath Hunnicutt Feb 10 '10 at 20:41 add a comment| 9 Answers 9 active oldest votes up vote 27 down vote accepted An access violation at anywhere near adress '00000000' indicates a null pointer access. You're using something before it's ever been created, most likely, or after it's been FreeAndNil()'d. A lot of times this is caused by accessing a component in the wrong place during form creation,
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 EAccessV