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Access Violation Dll

Any ideas on what is going on. Did 17 U.S. The access violation I receive is "Project Mock.exe raised exception class $C0000005 with message 'access violation at 0x00000000: read of address 0x00000000'. All rights reserved. | Check This Out

Specific error messages (including any memory address information) is really important when asking people to help you solve a problem. To simplify the issue. All the library funcionalities works fine (longly and hardly tested for years), but when it comes the time to unload, I get an exception error. This means they can't be inside a class: namespace MathFuncs { extern "C" __declspec(dllexport) double Add(double, double); } share|improve this answer edited Sep 14 '12 at 16:49 answered Sep 14 '12 http://stackoverflow.com/questions/12428423/access-violation-exception-when-using-a-dll-function

Please check the following for all of your modules in the Visual Studio properties: Project Properties -> C/C++ -> Code Generation -> Runtime Library. Would this be similar to static loading? This applies to all strings passed to and from your DLL--even those that are nested in records and classes.

First, you have two UnloadClick procedures defined in your test application, which makes it uncompileable. Craig Burke wrote: Hello, XE2, Win 7 32 bit app. Yes, it is similar to static loading as far as memory consumption is concerned. This appears so: Poco::Path FileSystem::ResourceFolder() { Poco::Path userData; //--SNIP-- (other OS's #ifdef'd here) // GAME->StartupPath is a std::string containing the exe's parent folder userData = (Poco::Path(GAME->StartupPath).parent() / "Resources").makeDirectory(); //--SNIP-- (and here)

Ok, tried adding Data.DBXClassRegistry as you suggested and av is now in the midas.dll. Close the app and crash. It really doesn't matter if you wrote no lines, or even if you didn't know what the program is supposed to do. see it here Do you have any newer Delphi version installed you could use for a test?

richard fritz Posts: 3 Registered: 5/21/00 Re: Access Violation when calling FreeLibrary in Delphi 2007 Reply Posted: Aug 31, 2012 11:26 PM in response to: Robert Liebeskind I have never used XE2 in production myself and cannot test using it since I don't have it installed anymore. I have 4 different dll's all compiled in the same env. I just started in the last couple of weeks to see this issue.

  • Host app code: unit Mock1; interface uses Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls; type TForm1 = class(TForm) Load: TButton; Call: TButton; Unload: TButton; Edit1: TEdit; procedure LoadClick(Sender:
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  • The problem comes when I call this method of my FileSystem class from the DLL (it's designed to take a filename/partial path and it looks in various places to find the
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  • I've tried it with commenting out the ShowForm and still problem persists.
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  • To simplify the issue.

This is probably a problem with the sequence in which unit Finalization sections are called. http://www.delphipages.com/forum/showthread.php?t=54084 The Ooh-Aah Cryptic Maze Send form result back to twig What are the benefits of an oral exam? A well written DLL should never do the things you mention. -- Rudy Velthuis http://www.rvelthuis.de "No man's knowledge here can go beyond his experience." -- John A. share|improve this answer edited Sep 14 '12 at 16:37 answered Sep 14 '12 at 16:28 Mr.C64 21.2k64587 Well thank you all for the comments. –RiskX Sep 14 '12 at

Parking lot supervisor Is there any way to take stable Long exposure photos without using Tripod? his comment is here DLL functions should only require simple POD (plain old data) types like integers, floats, POD structs, pointers, etc. Find all posts by Norrit #7 04-24-2002, 07:16 AM sudhir_shukla Member Join Date: Nov 2001 Posts: 39 RE: Access Violation Error when calling Dll function The funcations I Reply With Quote December 21st, 2012,11:52 PM #5 Paul McKenzie View Profile View Forum Posts Elite Member Power Poster Join Date Apr 1999 Posts 27,449 Re: 0xC0000005 - Access violation (Each

Third, your code that calls FreeLibrary (whichever one is actually being used) should set dllHandle to 0 and getDLLMock to nil after calling FreeLibrary; FreeLibrary does not magically set the dllHandle Thread Tools Display Modes #1 04-24-2002, 06:33 AM sudhir_shukla Member Join Date: Nov 2001 Posts: 39 Access Violation Error when calling Dll function I am relatively new to Your problem is that you use an ActiveX type-library but treed it like a regular dll ... http://qaisoftware.com/access-violation/access-violation-ie.html The DLL will not consume any CPU resources if none of its code is called (unless it has timers or such running). -- Peter Below (TeamB) Craig Burke Posts: 15 Registered:

I created a function to GetModuleHandle if 0 then SafeLoadLibrary. The last thing to look at are project settings. Björn Hi bjossifannar, thank you very much for the valuable feedback, we will track down from this end and update when solution become available.

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Zlamal, Jakub Mon, 07/16/2012 - 22:03 I think only way is to debug release version in Visual studio and look at assembler code and check values passed to routine and returned The error is from a different dll. Note also that using your DLL would be simpler if you adjust your class header file in such a way to use it in both exports and imports, e.g. #if defined(MATHFUNCS_EXPORT) Has power been stripped away from the US Constitution, during the Obama Administration?

Generalization of winding number to higher dimensions What early computers had excellent BASIC (or other language) at bootup? The C# code seems to execute fine, and does what it's supposed to do, but after it's done, it throws an access violation. Perhaps LoadLibrary already failed, you do not check whether or not it succeeded. navigate here The error goes if i uninstall the Nvidia driver and i have tried uninstall, reset the W10 and even fresh install the W10.

I installed some updates from windows/installed NVidia 1070 etc, then It stopped working and I got this error message!!! (I got z170 pro motherboard) it should be software related since I Currently, your code does not tell us what types these are. –Jerry Dodge Sep 9 '16 at 14:24 ChangeFileExt returns String - Not ANSIString. –A Lombardo Sep 9 '16 Best regards, Adriano Peter Below Posts: 964 Registered: 12/16/99 Re: Access Violation when calling FreeLibrary Reply Posted: Nov 29, 2014 12:59 AM in response to: Adriano Macome try if FClasses.Find(ClassName, Index) then begin ClassItem := FClasses.Objects[Index] as TClassRegistryItem; ClassItem.Free; FClasses.Delete(Index); end; finally FLock.UnlockList; end; end; TIA, Craig "Peter Below" wrote in message news:708738 at forums dot embarcadero

I just started in the last couple of weeks to see this issue. Was linking against the release version of one of the dependencies (PocoFoundation.dll vs. Is in use by hundreds of users and now I am getting calls with this issue. Sometimes it is a dll created by other programmers, sometimes it is related to QT.

Join them; it only takes a minute: Sign up Access violation exception when using a DLL function up vote 0 down vote favorite I created a simple DLL as part of Step by step. Please tell us why. Why are Zygote and Whatsapp asking for root?

Just seems that the DBX / midas.dll are not happy. Where in Visual Studio would one set that for the runtime library? –Javawag Jan 29 '15 at 22:01 Project Properties -> C/C++ -> Code Generation -> Runtime Library These TIA, Craig "Peter Below" wrote in message news:708526 at forums dot embarcadero dot com... Find all posts by sudhir_shukla #5 04-24-2002, 07:00 AM sudhir_shukla Member Join Date: Nov 2001 Posts: 39 RE: Access Violation Error when calling Dll function Since this Dll

Does leaving the DLL loaded use more memory or slow that app down at all? I would do this by running it several times and, each time it crashes, add a call before the call into the DLL, and also at several points in the call Helpful answers available: 2. try if FClasses.Find(ClassName, Index) then begin ClassItem := FClasses.Objects[Index] as TClassRegistryItem; ClassItem.Free; FClasses.Delete(Index); end; finally FLock.UnlockList; end; end; That looks as if some code calls the UnregisterClass method after the Tclassregistry

If your application has obtained a memory reference (string, object reference, interface reference, basically anything that refers to memory created by the DLL's memory manager) that reference would be invalid after Related Links: External Link: Microsoft File System Redirector LabVIEW 2013 Help: Debugging Applications and Shared Libraries LabVIEW 2013 Help: Debugging Shared Libraries and Calls to Shared Libraries KnowledgeBase 1HSAF6US: Why Do Use it, forget it. I am not giving any reasons and I did not mention that I cannot debug a crashing program!