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Share a link to this question via email, Google+, Twitter, or Facebook. Instead of LoadLibrary call GetModuleHandle with the DLL name first, to see if it is already loaded. Craig Burke wrote: Thanks Peter. Please click the link in the confirmation email to activate your subscription.

Boink! These DLL worked for over 10 years on large numbers of machines. The problem comes when using run-time dynamic linking. Otherwise, a race condition can occur.

Steve and Xavier are of the winners of the Delphi Informant Reader's Choice Award for both Delphi 4 Developer's Guide and Delphi 5 Developer's Guide. When I call FreeLibrary on the third-party library, it does some cleanup work (i.e. FreeLibrary return true in the buggy DETACH case code. –Adil May 7 '10 at 8:58 add a comment| Did you find this question interesting? end else ShowMessage(FmtLoadStr(319, ['mydll.dll'])); end; I changed from using ShareMem to SimpleShareMem and was able to call the dll's and Unload without issue on my Win 7 computer.

If I build the DLL using Win7 and XE2 I do not get an access violation. So at the time you called FreeLibrary, your bug in the DLL_PROCESS_DETACH case probably accessed memory that was in use by some other part of your program. If you choose databases above the Find search box on the homepage, or choose Advanced Search under the Find search box on any other page, you'll find a comprehensive list of Very very rare case, any idea?

I think the name is midaslib. How do I access your free audiobooks? You can also find results from the Free Library website by clicking on the link to FLP Site Search above your search results. I figured out that the AV is not happening, when I build the DLL in Delphi 2007 using RELEASE options.

Back to the top How can I order a new Library card online? Join them; it only takes a minute: Sign up FreeLibrary() causing access violation error? Use the tools on this page to focus your search or take the time to browse and explore our Knowledge Base by category. When the reference count reaches zero, the module is unloaded from the address space of the calling process and the handle is no longer valid.

Close the app and crash. Is 'if there's any' grammatical in this sentence? "top" not showing output over "ssh" How should I interpret "English is poor" review when I used a language check service before submission? So, the original code, while confusing, is indeed compilable. No code is run after the SafeLoadLibrary and still crashes on shutdown.

OR internally it handles this exception? The content you requested has been removed. To simplify the issue. commented out the FreeLibrary.

They certainly shouldn't be returning an int; should be an IntPtr. (Having an Int32 to store a pointer is a really bad idea - especially if your code ever runs on as the exe's. Ray specializes in user interface design and Delphi component development, and is a frequent speaker at developer conferences around the world. How do I search your electronic databases/resources?

That would make sense why it silently ignores and continues. –ProgramMax May 6 '10 at 19:01 Now you got it right :) But not sure why the access violation The other way around is also a problem: if you pass a memory reference created by the host application's memory manager to the DLL, and the DLL stores it beyond the I have 4 different dll's all compiled in the same env. Ask a question Quick access Forums home Browse forums users FAQ Search related threads Remove From My Forums Asked by: FreeLibrary() causes AccessViolationException Archived Forums V > Visual C# Language Question

Adam Wu Posts: 1 Registered: 1/17/02 Re: Access Violation when calling FreeLibrary Reply Posted: Feb 21, 2012 2:49 PM in response to: Robert Liebeskind Robert Liebeskind wrote: When I unloadpackage, raise av at "freelibrary". How can I renew materials online? How do I search the Library catalog?

Client is running it on T/S. Bibliografische InformationenTitelBorland Delphi 6 Developer's GuideSams Developer's GuidesAutorenSteve Teixeira, Xavier PachecoAusgabeillustriertVerlagSams Publishing, 2002ISBN0672321157, 9780672321153Länge1169 Seiten  Zitat exportierenBiBTeXEndNoteRefManÜber Google Books - Datenschutzerklärung - AllgemeineNutzungsbedingungen - Hinweise für Verlage - Problem melden - Hilfe Events are listed by location, date, and type. Don't worry about that, the OS will page out the memory occupied by the DLL code when it is not called for some time and more of the physical RAM present

Export The $PATH Variable, Line-By-Line Truth in numbers Is 'if there's any' grammatical in this sentence? If you need some kind of cleanup inside the DLL before it is unloaded, export a function for that and call it before your application terminates. -- Peter Below (TeamB) Peter Thank you for your assistance. Bob Swart (also known as Dr.Bob is a UK Borland Connections member and an independent technical author, trainer, and consultant using Delphi, Kylix, and C++Builder based in Helmond, The Netherlands.

I created a function to GetModuleHandle if 0 then SafeLoadLibrary. This is a bad "fix" but I only did it to test a theory. New tech, old clothes Sum of neighbours What are Imperial officers wearing here? Error Code: %02X\n", GetLastError( ) ); } } share|improve this answer edited May 27 '11 at 15:25 Zach Burlingame 9,008124662 answered May 27 '11 at 14:38 crypted 6,03522342 I'll

It is not the full code that I must use but the issue can be reproduced using the example code below. Log On Embarcadero Home Communities Articles Blogs Resources Downloads Help Embarcadero Discussion Forums » Delphi » RTL Welcome, Guest Login Guest Settings Thread: Access Violation when calling FreeLibrary This question Client is running it on Server 2008 RS2 T/S. To simplify the issue.

This is what the c# code looks like now (in principle):         public AnalysisInterface(string dllPath)         {                    // Search directory for dll-files and store their information             DirectoryInfo di = Downloads and tools Windows 10 dev tools Visual Studio Windows SDK Windows Store badges Essentials API reference (Windows apps) API reference (desktop apps) Code samples How-to guides (Windows apps) Learning resources If you have any feedback, please tell us. I think the name is midaslib.