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Access Violation Queryinterface

That's why you crash on mov eax,[ecx]. Cases #2 and #3 are wrong in painfully, immediately obvious ways. CO ! FServer can only be nil if TServerEventDispatch.ServerDisconnect has been called, but the TServerEventDispatch objects isn't deleted. http://3swindows.com/access-violation/what-is-an-access-violation.html

Privacy policy [prev in list] [next in list] [prev in thread] [next in thread] List: ms-dcom Subject: QueryInterface throws an exception (access violation) From: Andrew Johnson Release(); if(pStats) pStats->Release(); } CoUninitialize(); return 0; } 04-30-2003 #2 rhinoishere View Profile View Forum Posts Registered User Join Date Apr 2003 Posts http://stackoverflow.com/questions/2698068/access-violation-after-getinterface-queryinterface-in-delphi

Equation system with two unknown variables Do we know exactly where Kirk will be born? EDITED: I create a host using .NET with the follow code and works, but Delphi host still not working:

 var instancia = moduleManager.CreateInstance(moduleManager.Plugins["PluginModuleTeste.PluginTeste"]); string res = (string)instancia.GetType().InvokeMember("Echo", System.Reflection.BindingFlags.InvokeMethod, null, Something like this: CComPtr spDisp; m_pWB2->get_Document(&spDisp); CComPtr spDoc; spDisp->QueryInterface(&spDoc); Be prepared to handle the situation where QueryInterface produces a NULL pointer - that is, when the document loaded into the browser See stackoverflow.com/questions/2182612 –mjn Mar 21 '10 at 11:29   It is just because TInterfacedPersistent doesn't use reference counting. 

Quick Navigation C++ Programming Top Site Areas Settings Private Messages Subscriptions Who's Online Search Forums Forums Home Forums General Programming Boards C++ Programming C Programming C# Programming Game Programming Networking/Device Communication pStats->DisplayStats(); hr = pStats->QueryInterface(IID_IEngine, (void**)&pEngine); } if(SUCCEEDED(hr)) { int curSp = 0; int maxSp = 0; pEngine->GetMaxSpeed(&maxSp); do // Zoom! { pEngine->SpeedUp(); pEngine->GetCurSpeed(&curSp); cout << "Speed is: " << curSp << But it does not. Workarounds None Attachment None Comments Tomohiro Takahashi at 6/21/2010 9:20:06 PM - Ok, if you have any sample project to reproduce your issue, please attach it to this report.

Everything runs successfully. Log In C# Module Manager + Delphi Host - Access Violation at Address ABABABAB on onvoke method Hydra AlceuCardoso (Alceu Silveira Cardoso) 2014-08-12 14:40:44 UTC #1 C# code:
public interface So it's possible that there's some otherwise-valid QueryInterface code out there, somewhere, that implements case #4. I read a lot of articles and notes on the internets, but COM and COM in Delphi are still not clear to me.

Thanks in advance. share|improve this answer answered Apr 23 '10 at 12:46 Lars Truijens 32k487113 If I remove IUnknown.QueryInterface - com4j says that interface (ITestCom) not supported. –W55tKQbuRu28Q4xv Apr 23 '10 at This is illegal. All rights reserved.

thought I'd give it a try anyway... 04-30-2003 #3 Scarlet7 View Profile View Forum Posts Registered User Join Date Mar 2003 Location UK Posts 170 >hr = CoGetClassObject(CLSID_CoCar, CLSCTX_ALL, NULL, IID_IClassFactory, http://marc.info/?l=ms-dcom&m=104333347304640 If you're lucky, this would result in an Access Violation. char buff[80]; BSTR bstr; pStats->GetPetName(&bstr); WideCharToMultiByte(CP_ACP, NULL, bstr, -1, buff, 80, NULL, NULL); cout << buff << " has blown up! Related Sites Visual Studio Visual Studio Integrate VSIP Program Microsoft .NET Microsoft Azure Connect Forums Blog Facebook LinkedIn Stack Overflow Twitter Visual Studio Events YouTube Developer Resources Code samples Documentation Downloads

Any change? 2. check over here When X returns and its teardown code executes, Intf2 is non-nil, so its _Release gets called. Developer Tools Blackfish SQL C++Builder Delphi FireMonkey Prism InterBase JBuilder J Optimizer HTML5 Builder 3rdRail & TurboRuby Database Tools Change Manager DBArtisan DB Optimizer ER/Studio Performance Center Rapid SQL Technical Articles Thread Tools Show Printable Version Email this Page… Subscribe to this Thread… Search Thread Advanced Search Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 04-30-2003 #1 rhinoishere

  1. In addition you may consider using this way of calling supports for your convinience and readabilty of the code: if Supports(FControlList[i], IMyControlEx, MyControlEx) then begin MyControlEx.DoYourMagic(Self, SomeData); end; share|improve this answer
  2. Thanks, Microsoft.) So I thought through it some more.
  3. The underlying object instance may have been freed already.
  4. If QueryInterface is asked for a GUID that a particular object doesn't support, it will return E_NOINTERFACE.
  5. can't figure it out...
  6. This can happen in TOleServer.Destroy because of the following two lines: FEventDispatch.ServerDisconnect; if (FEventDispatch._Release = 0) then FEventDispatch.Free; Here, FEventDispatch will not be freed if _Release doesn't return 0.
  7. It could be a PDF file, an MS Word document or, as in your case, a Windows shell folder.Igor Tandetnik Marked as answer by Blast Xiang Friday, August 23, 2013 6:13
  8. Moral: Don't design stupid APIs that return the same information twice!

I try to make a COM Interface and Impl class - it works if I call an interface method from Delphi (I create an impl object via TestClient.Create), but if I E_ACCESSDENIED General access failure (returned from LoadLib/CreateProcess). REGDB_E_CLASSNOTREG CLSID is not properly registered. his comment is here Then try to figure out why offset zero contains 0xc instead of a valid address. –Marc Sherman Oct 12 '15 at 14:37 add a comment| active oldest votes Know someone who

Here is my code: IHTMLDocument2* pDoc =NULL; CComPtr iElements=NULL; BSTR bstr=NULL; HRESULT hr=m_pWB2->get_Document((IDispatch**)&pDoc); hr=pDoc->get_body(&iElements); hr=iElements->get_innerHTML(&bstr); This code works fine until I made it navigate to "c:\" , when the program run Hope that helps! YUI Reset, Fonts, and Grids.

Then I did the usual "look at the CPU view, figure out what the compiler is doing, and add more stuff to make sure I've got it right" drill.

Any idea will be appreciated!!! Circular Array Rotation What are the benefits of an oral exam? I will try to make dll with COM interfaces from scratch... –W55tKQbuRu28Q4xv Apr 26 '10 at 3:44 add a comment| up vote 0 down vote If the crash is happening after Preserving Vertices How to tell my parents I want to marry my girlfriend How to interpret this decision tree?

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed It shouldn't be necessary, but if you ever end up dealing with a pathological QueryInterface, the extra checking may be safer. This is illegal. http://3swindows.com/access-violation/wow-access-violation-windows-10.html Help Print Public Report Report From: Delphi-BCB/ActiveX [ Add a report in this area ] Report #: 85604 Status: Need Feedback Access Violation in TServerEventDispatch.QueryInterface Project:Delphi Build #:

It will do the wrong thing in case #4; namely, it will return the interface that QueryInterface lied and said it didn't have. CO_E_APPDIDNTREG EXE was launched, but it didn't register class object (may or may not have shut down). When it compiles the call to Foo (and sees that the interface variable is being passed to an out parameter), the compiler automatically calls @IntfClear before actually calling Foo. It's calling QueryInterface, getting back a result that says that this interface is good, and trying to use it for something that immediately breaks.

The QI in SetObjects() might be failing due to some corrupted registry data for IMyInterface. The exception occurs in the following line: if IsEqualIID(IID, FServer.FServerData^.EventIID) then because FServer is nil (it's a "Read of address 00000034" error). When the teardown code executes, Intf2 is a garbage value, but is not nil. CO_E_DLLNOTFOUND In-process DLL or handler DLL not found (depends on context).

Can you post a few instructions prior to address 5d931569 to see what's being called? That's just screwy, and it's not what the specs say you should do, but it could happen. You must enter a numeric report ID View Your Reports Search Server Response from: ETNACODE01 Copyright© 1994 - 2013 Embarcadero Technologies, Inc. Ack.