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• WCF service and COM interop callback

  - by Sjblack

  I have a COM object that creates an instance of a WCF service and passes a handle to itself as a callback. The com object is marked/initialized as MTA. The problem being every instance of the WCF service that makes a call to the callback occurs on the same thread so they are being processed one at a time which is causing session timeouts under a heavy load. The WCF service is session based not sure if that makes any difference.

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• Visual Studio COM access

  - by cheez

  Is it possible to control Visual Studio like you can control Excel through the Python COM API? I'm trying to kick off a build through COM (don't ask!)

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• COM Dual Interfaces

  - by Tony

  A dual interface in COM is one that is able to be accessed via a DispInterface or via VTable methods. Now can someone tell me what is exactly what the difference is between the two methods? I thought that a VTable is a virtual table which holds the pointers to the different functions when implementing a class hierarchy which has virtual functions that can be overridden in child classes. However I do not see how this is related to a dual interface in COM?

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• Finalizing a COM object

  - by Neverrav

  I'm trying to implement a singleton class, that holds a com object inside it. Class implements IDisposable interface, but when I try to implement a finalization method, I get an exception of access to com object from another thread. This happens because clr uses a different thread when finalizes objects. Is there any way to implement such a thing or maybe I just doing something wrong?

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• Debugging InProc COM Dll

  - by Tony

  I have a project in VC++ 6.0 where there is an exe and a InProc COM Dll. I want to be able to place a breakpoint somewhere in the InProc COM DLL, but VC++ won't allow me to set a breakpoint. I have the source code for this DLL, however I cannot figure out how I can place a breakpoint in the code and the debug it? Can someone help me.

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• Translate COM error codes in C#

  - by Paul Keister

  In C, Pascal, and C++ it is possible to use the FormatMessage function to retrieve a "friendly" error message that corresponds to a COM HRESULT error code. This question contains sample code that demonstrates the C++ approach. Of course it would be possible to build a managed C++ assembly to perform this function for C# and VB.NET code, but I'm wondering: is there a way to translate COM error codes using the .NET system libraries?

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• Remote DLL Registration without access to HKEY_CLASSES_ROOT

  - by mohlsen

  We have a legacy VB6 application that updates itself on startup by pulling down the latest files and registering the COM components. This works for both local (regsvr32) ActiveX COM Components and remote (clireg32) ActiveX COM components registered in COM+ on another machine. New requirements are preventing us from writing to HKEY_LOACL_MACHINE (HKLM) for security reasons, which is what obviously happens by default when calling regsvr32 and clireg32. We have come up with an way to register the local COM componet under HKEY_CURRENT_USER\Software\Classes (HKCU) using the RegOverridePredefKey Windows API method. This works by redirecting the inserts into the registry to the HKCU location. Then when the COM components are instantiated, windows first looks to HKCU before looking for component information in HKLM. This replaces what regsvr32 is doing. The problem we are experiencing at this time is when we attempt to register VBR / TLB using clireg32, this registration process also adds registration keys to HKEY_LOACL_MACHINE. Is there a way to redirect clireg32.exe to register component is HKEY_CURRENT_USER? Are there any other methods that would allow us to register these COM+ components on clients machine with limited security access? Our only solution at this time would be to manually write the registration information to the registry, but that is not ideal and would be a maint issue.

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• Securely persist session between https://secure.yourname.com and http://www.yourname.com on rails ap

  - by Matt

  My rails site posts to a secure host (e.g. 'https://secure.yourname.com') when the user logs into the site. Session data is stored in the database, with the cookie containing only the session ID. The problem is that when the user returns to a non-https page, such as the home page (e.g. 'http://www.yourname.com') the user appears to have logged out. I believe the reason for this is that a separate cookie is stored for each host (www vs. secure). Is this correct? What is the best secure way to persist the session between both the http and https sections of the site? Does anyone know of any plugins that address this problem? The site runs on Heroku.

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• Week in Geek: US Govt E-card Scam Siphons Confidential Data Edition

  - by Asian Angel

  This week we learned how to “back up photos to Flickr, automate repetitive tasks, & normalize MP3 volume”, enable “stereo mix” in Windows 7 to record audio, create custom papercraft toys, read up on three alternatives to Apple’s flaky iOS alarm clock, decorated our desktops & app docks with Google icon packs, and more. Photo by alexschlegel. Random Geek Links It has been a busy week on the security & malware fronts and we have a roundup of the latest news to help keep you updated. Photo by TopTechWriter.US. US govt e-card scam hits confidential data A fake U.S. government Christmas e-card has managed to siphon off gigabytes of sensitive data from a number of law enforcement and military staff who work on cybersecurity matters, many of whom are involved in computer crime investigations. Security tool uncovers multiple bugs in every browser Michal Zalewski reports that he discovered the vulnerability in Internet Explorer a while ago using his cross_fuzz fuzzing tool and reported it to Microsoft in July 2010. Zalewski also used cross_fuzz to discover bugs in other browsers, which he also reported to the relevant organisations. Microsoft to fix Windows holes, but not ones in IE Microsoft said that it will release two security bulletins next week fixing three holes in Windows, but it is still investigating or working on fixing holes in Internet Explorer that have been reportedly exploited in attacks. Microsoft warns of Windows flaw affecting image rendering Microsoft has warned of a Windows vulnerability that could allow an attacker to take control of a computer if the user is logged on with administrative rights. Windows 7 Not Affected by Critical 0-Day in the Windows Graphics Rendering Engine While confirming that details on a Critical zero-day vulnerability have made their way into the wild, Microsoft noted that customers running the latest iteration of Windows client and server platforms are not exposed to any risks. Microsoft warns of Office-related malware Microsoft’s Malware Protection Center issued a warning this week that it has spotted malicious code on the Internet that can take advantage of a flaw in Word and infect computers after a user does nothing more than read an e-mail. *Refers to a flaw that was addressed in the November security patch releases. Make sure you have all of the latest security updates installed. Unpatched hole in ImgBurn disk burning application According to security specialist Secunia, a highly critical vulnerability in ImgBurn, a lightweight disk burning application, can be used to remotely compromise a user’s system. Hole in VLC Media Player Virtual Security Research (VSR) has identified a vulnerability in VLC Media Player. In versions up to and including 1.1.5 of the VLC Media Player. Flash Player sandbox can be bypassed Flash applications run locally can read local files and send them to an online server – something which the sandbox is supposed to prevent. Chinese auction site touts hacked iTunes accounts Tens of thousands of reportedly hacked iTunes accounts have been found on Chinese auction site Taobao, but the company claims it is unable to take action unless there are direct complaints. What happened in the recent Hotmail outage Mike Schackwitz explains the cause of the recent Hotmail outage. DOJ sends order to Twitter for Wikileaks-related account info The U.S. Justice Department has obtained a court order directing Twitter to turn over information about the accounts of activists with ties to Wikileaks, including an Icelandic politician, a legendary Dutch hacker, and a U.S. computer programmer. Google gets court to block Microsoft Interior Department e-mail win The U.S. Federal Claims Court has temporarily blocked Microsoft from proceeding with the $49.3 million, five-year DOI contract that it won this past November. Google Apps customers get email lockdown Companies and organisations using Google Apps are now able to restrict the email access of selected users. LibreOffice Is the Default Office Suite for Ubuntu 11.04 Matthias Klose has announced some details regarding the replacement of the old OpenOffice.org 3.2.1 packages with the new LibreOffice 3.3 ones, starting with the upcoming Ubuntu 11.04 (Natty Narwhal) Alpha 2 release. Sysadmin Geek Tips Photo by Filomena Scalise. How to Setup Software RAID for a Simple File Server on Ubuntu Do you need a file server that is cheap and easy to setup, “rock solid” reliable, and has Email Alerting? This tutorial shows you how to use Ubuntu, software RAID, and SaMBa to accomplish just that. How to Control the Order of Startup Programs in Windows While you can specify the applications you want to launch when Windows starts, the ability to control the order in which they start is not available. However, there are a couple of ways you can easily overcome this limitation and control the startup order of applications. Random TinyHacker Links Using Opera Unite to Send Large Files A tutorial on using Opera Unite to easily send huge files from your computer. WorkFlowy is a Useful To-do List Tool A cool to-do list tool that lets you integrate multiple tasks in one single list easily. Playing Flash Videos on iOS Devices Yes, you can play flash videos on jailbroken iPhones. Here’s a tutorial. Clear Safari History and Cookies On iPhone A tutorial on clearing your browser history on iPhone and other iOS devices. Monitor Your Internet Usage Here’s a cool, cross-platform tool to monitor your internet bandwidth. Super User Questions See what the community had to say on these popular questions from Super User this week. Why is my upload speed much less than my download speed? Where should I find drivers for my laptop if it didn’t come with a driver disk? OEM Office 2010 without media – how to reinstall? Is there a point to using theft tracking software like Prey on my laptop, if you have login security? Moving an “all-in-one” PC when turned on/off How-To Geek Weekly Article Recap Get caught up on your HTG reading with our hottest articles from this past week. How to Combine Rescue Disks to Create the Ultimate Windows Repair Disk How To Boot 10 Different Live CDs From 1 USB Flash Drive What is Camera Raw, and Why Would a Professional Prefer it to JPG? Did You Know Facebook Has Built-In Shortcut Keys? The How-To Geek Guide to Audio Editing: The Basics One Year Ago on How-To Geek Enjoy looking through our latest gathering of retro article goodness. Learning Windows 7: Create a Homegroup & Join a New Computer To It How To Disconnect a Machine from a Homegroup Use Remote Desktop To Access Other Computers On a Small Office or Home Network How To Share Files and Printers Between Windows 7 and Vista Allow Users To Run Only Specified Programs in Windows 7 The Geek Note That is all we have for you this week and we hope your first week back at work or school has gone very well now that the holidays are over. Know a great tip? Send it in to us at tips@howtogeek.com. Photo by Pamela Machado. Latest Features How-To Geek ETC HTG Projects: How to Create Your Own Custom Papercraft Toy How to Combine Rescue Disks to Create the Ultimate Windows Repair Disk What is Camera Raw, and Why Would a Professional Prefer it to JPG? The How-To Geek Guide to Audio Editing: The Basics How To Boot 10 Different Live CDs From 1 USB Flash Drive The 20 Best How-To Geek Linux Articles of 2010 Arctic Theme for Windows 7 Gives Your Desktop an Icy Touch Install LibreOffice via PPA and Receive Auto-Updates in Ubuntu Creative Portraits Peek Inside the Guts of Modern Electronics Scenic Winter Lane Wallpaper to Create a Relaxing Mood Access Your Web Apps Directly Using the Context Menu in Chrome The Deep – Awesome Use of Metal Objects as Deep Sea Creatures [Video]

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• ActiveX component can't create Object Error? Check 64 bit Status

  - by Rick Strahl

  If you're running on IIS 7 and a 64 bit operating system you might run into the following error using ASP classic or ASP.NET with COM interop. In classic ASP applications the error will show up as: ActiveX component can't create object   (Error 429) (actually without error handling the error just shows up as 500 error page) In my case the code that's been giving me problems has been a FoxPro COM object I'd been using to serve banner ads to some of my pages. The code basically looks up banners from a database table and displays them at random. The ASP classic code that uses it looks like this: <% Set banner = Server.CreateObject("wwBanner.aspBanner") banner.BannerFile = "wwsitebanners" Response.Write(banner.GetBanner(-1)) %> Originally this code had no specific error checking as above so the ASP pages just failed with 500 error pages from the Web server. To find out what the problem is this code is more useful at least for debugging: <% ON ERROR RESUME NEXT Set banner = Server.CreateObject("wwBanner.aspBanner") Response.Write(err.Number & " - " & err.Description) banner.BannerFile = "wwsitebanners" Response.Write(banner.GetBanner(-1)) %> which results in: 429 - ActiveX component can't create object which at least gives you a slight clue. In ASP.NET invoking the same COM object with code like this: <% dynamic banner = wwUtils.CreateComInstance("wwBanner.aspBanner") as dynamic; banner.cBANNERFILE = "wwsitebanners"; Response.Write(banner.getBanner(-1)); %> results in: Retrieving the COM class factory for component with CLSID {B5DCBB81-D5F5-11D2-B85E-00600889F23B} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)). The class is in fact registered though and the COM server loads fine from a command prompt or other COM client. This error can be caused by a COM server that doesn't load. It looks like a COM registration error. There are a number of traditional reasons why this error can crop up of course. The server isn't registered (run regserver32 to register a DLL server or /regserver on an EXE server) Access permissions aren't set on the COM server (Web account has to be able to read the DLL ie. Network service) The COM server fails to load during initialization ie. failing during startup One thing I always do to check for COM errors fire up the server in a COM client outside of IIS and ensure that it works there first - it's almost always easier to debug a server outside of the Web environment. In my case I tried the server in Visual FoxPro on the server with: loBanners = CREATEOBJECT("wwBanner.aspBanner") loBanners.cBannerFile = "wwsitebanners" ? loBanners.GetBanner(-1) and it worked just fine. If you don't have a full dev environment on the server you can also use VBScript do the same thing and run the .vbs file from the command prompt: Set banner = Server.CreateObject("wwBanner.aspBanner") banner.BannerFile = "wwsitebanners" MsgBox(banner.getBanner(-1)) Since this both works it tells me the server is registered and working properly. This leaves startup failures or permissions as the problem. I double checked permissions for the Application Pool and the permissions of the folder where the DLL lives and both are properly set to allow access by the Application Pool impersonated user. Just to be sure I assigned an Admin user to the Application Pool but still no go. So now what? 64 bit Servers Ahoy A couple of weeks back I had set up a few of my Application pools to 64 bit mode. My server is Server 2008 64 bit and by default Application Pools run 64 bit. Originally when I installed the server I set up most of my Application Pools to 32 bit mainly for backwards compatibility. But as more of my code migrates to 64 bit OS's I figured it'd be a good idea to see how well code runs under 64 bit code. The transition has been mostly painless. Until today when I noticed the problem with the code above when scrolling to my IIS logs and noticing a lot of 500 errors on many of my ASP classic pages. The code in question in most of these pages deals with this single simple COM object. It took a while to figure out that the problem is caused by the Application Pool running in 64 bit mode. The issue is that 32 bit COM objects (ie. my old Visual FoxPro COM component) cannot be loaded in a 64 bit Application Pool. The ASP pages using this COM component broke on the day I switched my main Application Pool into 64 bit mode but I didn't find the problem until I searched my logs for errors by pure chance. To fix this is easy enough once you know what the problem is by switching the Application Pool to Enable 32-bit Applications: Once this is done the COM objects started working correctly again. 64 bit ASP and ASP.NET with DCOM Servers This is kind of off topic, but incidentally it's possible to load 32 bit DCOM (out of process) servers from ASP.NET and ASP classic even if those applications run in 64 bit application pools. In fact, in West Wind Web Connection I use this capability to run a 64 bit ASP.NET handler that talks to a 32 bit FoxPro COM server which allows West Wind Web Connection to run in native 64 bit mode without custom configuration (which is actually quite useful). It's probably not a common usage scenario but it's good to know that you can actually access 32 bit COM objects this way from ASP.NET. For West Wind Web Connection this works out well as the DCOM interface only makes one non-chatty call to the backend server that handles all the rest of the request processing. Application Pool Isolation is your Friend For me the recent incident of failure in the classic ASP pages has just been another reminder to be very careful with moving applications to 64 bit operation. There are many little traps when switching to 64 bit that are very difficult to track and test for. I described one issue I had a couple of months ago where one of the default ASP.NET filters was loading the wrong version (32bit instead of 64bit) which was extremely difficult to track down and was caused by a very sneaky configuration switch error (basically 3 different entries for the same ISAPI filter all with different bitness settings). It took me almost a full day to track this down). Recently I've been taken to isolate individual applications into separate Application Pools rather than my past practice of combining many apps into shared AppPools. This is a good practice assuming you have enough memory to make this work. Application Pool isolate provides more modularity and allows me to selectively move applications to 64 bit. The error above came about precisely because I moved one of my most populous app pools to 64 bit and forgot about the minimal COM object use in some of my old pages. It's easy to forget. To 64bit or Not Is it worth it to move to 64 bit? Currently I'd say -not really. In my - admittedly limited - testing I don't see any significant performance increases. In fact 64 bit apps just seem to consume considerably more memory (30-50% more in my pools on average) and performance is minimally improved (less than 5% at the very best) in the load testing I've performed on a couple of sites in both modes. The only real incentive for 64 bit would be applications that require huge data spaces that exceed the 32 bit 4 gigabyte memory limit. However I have a hard time imagining an application that needs 4 gigs of memory in a single Application Pool :-). Curious to hear other opinions on benefits of 64 bit operation. © Rick Strahl, West Wind Technologies, 2005-2011Posted in COM   ASP.NET  FoxPro  

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• Parse.com REST API in Java (NOT Android)

  - by Orange Peel

  I am trying to use the Parse.com REST API in Java. I have gone through the 4 solutions given here https://parse.com/docs/api_libraries and have selected Parse4J. After importing the source into Netbeans, along with importing the following libraries: org.slf4j:slf4j-api:jar:1.6.1 org.apache.httpcomponents:httpclient:jar:4.3.2 org.apache.httpcomponents:httpcore:jar:4.3.1 org.json:json:jar:20131018 commons-codec:commons-codec:jar:1.9 junit:junit:jar:4.11 ch.qos.logback:logback-classic:jar:0.9.28 ch.qos.logback:logback-core:jar:0.9.28 I ran the example code from https://github.com/thiagolocatelli/parse4j Parse.initialize(APP_ID, APP_REST_API_ID); // I replaced these with mine ParseObject gameScore = new ParseObject("GameScore"); gameScore.put("score", 1337); gameScore.put("playerName", "Sean Plott"); gameScore.put("cheatMode", false); gameScore.save(); And I got that it was missing org.apache.commons.logging, so I downloaded that and imported it. Then I ran the code again and got Exception in thread "main" java.lang.NoSuchMethodError: org.slf4j.spi.LocationAwareLogger.log(Lorg/slf4j/Marker;Ljava/lang/String;ILjava/lang/String;Ljava/lang/Throwable;)V at org.apache.commons.logging.impl.SLF4JLocationAwareLog.debug(SLF4JLocationAwareLog.java:120) at org.apache.http.client.protocol.RequestAddCookies.process(RequestAddCookies.java:122) at org.apache.http.protocol.ImmutableHttpProcessor.process(ImmutableHttpProcessor.java:131) at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:193) at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:85) at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:108) at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:186) at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82) at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:106) at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:57) at org.parse4j.command.ParseCommand.perform(ParseCommand.java:44) at org.parse4j.ParseObject.save(ParseObject.java:450) I could probably fix this with another import, but I suppose then something else would pop up. I tried the other libraries with similar results, missing a bunch of libraries. Has anyone actually used REST API successfully in Java? If so, I would be grateful if you shared which library/s you used and anything else required to get it going successfully. I am using Netbeans. Thanks.

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• Retrieving the COM class factory for component error while generating word document

  - by TheDPQ

  Hello, I am trying to edit a word document from VB.NET using for the most part this code: How to automate Word from Visual Basic .NET to create a new document http://support.microsoft.com/kb/316383 It works fine on my machine but when i publish to the server i get the following error. Retrieving the COM class factory for component with CLSID {000209FF-0000-0000-C000-000000000046} failed due to the following error: 80070005. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.UnauthorizedAccessException: Retrieving the COM class factory for component with CLSID {000209FF-0000-0000-C000-000000000046} failed due to the following error: 80070005. The actual error happens when i try to just create a word application object Dim oWord As New Word.Application Using Visual Studio 2008 and VB.NET 3.5. I made a reference to the "Microsoft Word 10.0 Object Library" and i see Interop.Word.dll file in the bin directory. Using MS Office 2003 on development machine and Windows Server 2003 Still fairly new to .NET and don't have much knowledge about window server, but "UnauthorizedAccessException" sounds like a permission issue. I'm wondering if someone could point me in the right direction on what i might need to do to give my little application access to use word. Thank you so much for your time.

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• Encrypting using RSA via COM Interop = "The requested operation requires delegation to be enabled on

  - by Mr AH

  Hi Guys, So i've got this little static method in a .Net class which takes a string, uses some stored public key and returns the encrypted version of that key. This is basically so some user entered data can be saved an encrypted, then retrieved and decrypted at a later date. Pretty basic stuff and the unit test works fine. However, part of the application is in classic ASP. This then uses some COM visible version of the class to go off and invoke the method on the real class and return the same string to the COM client (classic ASP). I use this kind of stuff all the time, but in this case we have a major problem. As the method is doing something with RSA keys and has to access certain machine information to do so, we get the error: "The requested operation requires delegation to be enabled on the machine. I've searched around a lot, but can't really understand what this means. I assume I am getting this error on the COM but not the UT because the UT runs as me (Administrator) and classic ASP as IWAM. Anyone know what I need to do to enable IWAM to do this? Or indeed if this is the real problem here?

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• Making .NET assembly COM-visible and working for VB5

  - by Cyberherbalist

  I have an assembly which I have managed to make visible to VB6 and it works, but having a problem accomplishing the same thing with VB5. For VB6, I have built the assembly, made it COM-visible, registered it as a COM object etc., and the assembly shows in VB6's References list, and allows me to use it successfully. The Object Browser also shows the method in the assy. I copied the assembly and its TLB to a virtual workstation used for VB5 development, and ran Regasm, apparently successfully: C:\>C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727 \regasm arserviceinterface.dll /tlb:arserviceinterface.tlb Microsoft (R) .NET Framework Assembly Registration Utility 2.0.50727.3053 Copyright (C) Microsoft Corporation 1998-2004. All rights reserved. Assembly exported to 'C:\Projects\AR\3rd Party\ARService\arserviceinterface.tlb' , and the type library was registered successfully Note that the virtual W/S is Win2k and does not have .NET Fx 3.5 on it, just 2.0. The assembly shows up in the References that can be selected in VB5, but the method of the assembly doesn't show up in the Object Browser, and it is generally unusable. Either there is a step to do that I haven't done, or VB5 doesn't know how to use such a COM object. Note that the VB5 setup is on a virtual workstation, not the same workstation that VB6 is installed on. Any ideas? One thing that occurred to me is that I might need to generate and use a strong name on the workstation in question, but...

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• Retrieve COM ProgID from exe without registering it

  - by mangelo

  Background: I would like to extract the COM data from a VB6 application so I can register it correctly (according to Microsoft best practice) the application. I am using WiX 3.0 and heat.exe will not extract the data (known issue with heat) and I do not have ready access to the associated TLB file. The VB6 application does not have compatibility turned on so it regenerates the COM GUIDs every build (They want to have the application be able to run side by side with an older version.) I created a C# application that will collect the TypeLib, interface and CoClass information from the VB6 application without registering it and create a wxs file for candle to use. My company has several other older applications like this and I would like to make it a more generic solution. The Issues: 1.Is there a way to collect the 'true' ProgID (programmer intended one) from the application with out the project or TLB file and without registering it? 2.Is there a way to find out the intended Threading Model from a DLL without registering it? (I intend that it can handle all COM active items, might as well be complete) Thank you.

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• How to wrap a thirdparty library COM class for notifications in a C++ project

  - by geocoin

  A thirdparty vendor has provided a COM interface as an external API to their product, and for sending instructions to it, it's fine with the mechanism of generating class wrappers with visual studio by importing from the dll, then creating instances of the created classes, calling their CreateDispatch(), using the access functions and releasing when done. For return notifications, I'd normally create an EventsListener class derived from IDispatch using the Invoke function to handle events returning from the interface. This vendor has created an Events lass which I have to wrap and expose, then explicitly tell the installation where to look. all the example are given is C# where it's really easy, but I'm struggling on how to do it in C++ in the C# example, the interop dll provided is simply added as a reference and derived into a class like so: using System; using System.Runtime.InteropServices; using System.Windows.Forms; using System.Text; using <THIER INTEROP LIB> namespace some.example.namespace { [ComVisible(true)] public class EventViewer : IEvents //where IEvents is their events class { public void OnEvent(EventID EventID, object pData) //overridden function { //event handled here } } } In broad terms I assume that I must create a COM interface, since they require a ProgID from me to instantiate, but how do I derive that's been wrapped by the import and then expose the created class to COM I'm just not sure where to even start, as all the tutorials I've seen so far talk in terms of creating brand new classes not wrapping a third party one

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• Help Us Pick the First T-Shirt Design to Promote How-To Geek

  - by Eric Z Goodnight

  Here’s your first peek at How-To Geek’s new line of merchandise! Tell us what you think, what you like, and what you actually would like to own in this first round of potential HTG tee shirts. If you like the content here at HTG, we’d love to hear back from you—we made these for you, the readers, and we hope to hear what suits you and if you like what we’ve got to offer. Check them out, tell us your thoughts in the comments section (or send us emails at [email protected]) and fill out our poll in the section below.  The design that you like the most will be professionally printed and sold right here at howtogeek.com. Interested in buying one of them right now? Jump to the bottom to be notified when they’re ready for be bought and shipped right to you. How to Own Your Own Website (Even If You Can’t Build One) Pt 3 How to Sync Your Media Across Your Entire House with XBMC How to Own Your Own Website (Even If You Can’t Build One) Pt 2

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• error while installing ia32-libs

  - by user3405516

  I am trying to install "ia32-libs" After doing google I did following steps. Yet not able to do it... 1st step i have added dpkg --add-architecture i386 2nd step added "deb http://archive.ubuntu.com/ubuntu/ raring main restricted universe multiverse" ia32-libs-raring.list" root@user:/etc/apt/sources.list.d# sudo dpkg --add-architecture i386 root@user:/etc/apt/sources.list.d# echo "deb http://archive.ubuntu.com/ubuntu/ raring main restricted universe multiverse" >ia32-libs-raring.list root@user:/etc/apt/sources.list.d# apt-get update Ign http://us-east-1.ec2.archive.ubuntu.com trusty InRelease Ign http://security.ubuntu.com trusty-security InRelease Ign http://archive.ubuntu.com raring InRelease Ign http://us-east-1.ec2.archive.ubuntu.com trusty-updates InRelease Hit http://security.ubuntu.com trusty-security Release.gpg Ign http://archive.ubuntu.com raring Release.gpg Hit http://us-east-1.ec2.archive.ubuntu.com trusty Release.gpg Hit http://security.ubuntu.com trusty-security Release Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates Release.gpg Ign http://archive.ubuntu.com raring Release Hit http://us-east-1.ec2.archive.ubuntu.com trusty Release Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates Release Hit http://security.ubuntu.com trusty-security/main Sources Hit http://us-east-1.ec2.archive.ubuntu.com trusty/main Sources Hit http://security.ubuntu.com trusty-security/universe Sources Hit http://us-east-1.ec2.archive.ubuntu.com trusty/universe Sources Hit http://security.ubuntu.com trusty-security/main amd64 Packages Hit http://us-east-1.ec2.archive.ubuntu.com trusty/main amd64 Packages Hit http://security.ubuntu.com trusty-security/universe amd64 Packages Hit http://us-east-1.ec2.archive.ubuntu.com trusty/universe amd64 Packages Hit http://security.ubuntu.com trusty-security/main i386 Packages Hit http://us-east-1.ec2.archive.ubuntu.com trusty/main i386 Packages Hit http://security.ubuntu.com trusty-security/universe i386 Packages Hit http://us-east-1.ec2.archive.ubuntu.com trusty/universe i386 Packages Hit http://security.ubuntu.com trusty-security/main Translation-en Hit http://security.ubuntu.com trusty-security/universe Translation-en Hit http://us-east-1.ec2.archive.ubuntu.com trusty/main Translation-en Hit http://us-east-1.ec2.archive.ubuntu.com trusty/universe Translation-en Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates/main Sources Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates/universe Sources Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates/main amd64 Packages Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates/universe amd64 Packages Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates/main i386 Packages Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates/universe i386 Packages Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates/main Translation-en Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates/universe Translation-en Ign http://us-east-1.ec2.archive.ubuntu.com trusty/main Translation-en_US Ign http://us-east-1.ec2.archive.ubuntu.com trusty/universe Translation-en_US Err http://archive.ubuntu.com raring/main amd64 Packages 404 Not Found [IP: 91.189.91.13 80] Err http://archive.ubuntu.com raring/restricted amd64 Packages 404 Not Found [IP: 91.189.91.13 80] Err http://archive.ubuntu.com raring/universe amd64 Packages 404 Not Found [IP: 91.189.91.13 80] Err http://archive.ubuntu.com raring/multiverse amd64 Packages 404 Not Found [IP: 91.189.91.13 80] Err http://archive.ubuntu.com raring/main i386 Packages 404 Not Found [IP: 91.189.91.13 80] Err http://archive.ubuntu.com raring/restricted i386 Packages 404 Not Found [IP: 91.189.91.13 80] Err http://archive.ubuntu.com raring/universe i386 Packages 404 Not Found [IP: 91.189.91.13 80] Err http://archive.ubuntu.com raring/multiverse i386 Packages 404 Not Found [IP: 91.189.91.13 80] Ign http://archive.ubuntu.com raring/main Translation-en_US Ign http://archive.ubuntu.com raring/main Translation-en Ign http://archive.ubuntu.com raring/multiverse Translation-en_US Ign http://archive.ubuntu.com raring/multiverse Translation-en Ign http://archive.ubuntu.com raring/restricted Translation-en_US Ign http://archive.ubuntu.com raring/restricted Translation-en Ign http://archive.ubuntu.com raring/universe Translation-en_US Ign http://archive.ubuntu.com raring/universe Translation-en W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/main/binary-amd64/Packages 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/restricted/binary-amd64/Packages 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/universe/binary-amd64/Packages 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/multiverse/binary-amd64/Packages 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/main/binary-i386/Packages 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/restricted/binary-i386/Packages 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/universe/binary-i386/Packages 404 Not Found [IP: 91.189.91.13 80] W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.91.13 80] E: Some index files failed to download. They have been ignored, or old ones used instead.

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• How to diagnose cause, fix, or work around Adobe ActiveX / COM related error 0x80004005 progmaticall

  - by Streamline

  I've built a C# .NET app that uses the Adobe ActiveX control to display a PDF. It relies on a couple DLLs that get shipped with the application. These DLLs interact with the locally installed Adobe Acrobat or Adobe Acrobat Reader installed on the machine. This app is being used by some customer already and works great for nearly all users ( I check to see that the local machine is running at least version 9 of either Acrobat or Reader already ). I've found 3 cases where the app returns the error message "Error HRESULT E_FAIL has been returned from a call to a COM component" when trying to load (when the activex control is loading). I've checked one of these user's machines and he has Acrobat 9 installed and is using it frequently with no problems. It does appear that Acrobat 7 and 8 were installed at one time since there are entries for them in the registry along with Acrobat 9. I can't reproduce this problem locally, so I am not sure exactly which direction to go. The error at the top of the stacktrace is: System.Runtime.InteropServices.COMException (0x80004005): Error HRESULT E_FAIL has been returned from a call to a COM component. Some research into this error indicates it is a registry problem. Does anyone have a clue as to how to fix or work around this problem, or determine how to get to the core root of the problem? The full content of the error message is this: System.Runtime.InteropServices.COMException (0x80004005): Error HRESULT E_FAIL has been returned from a call to a COM component.    at System.Windows.Forms.UnsafeNativeMethods.CoCreateInstance(Guid& clsid, Object punkOuter, Int32 context, Guid& iid)    at System.Windows.Forms.AxHost.CreateWithoutLicense(Guid clsid)    at System.Windows.Forms.AxHost.CreateWithLicense(String license, Guid clsid)    at System.Windows.Forms.AxHost.CreateInstanceCore(Guid clsid)    at System.Windows.Forms.AxHost.CreateInstance()    at System.Windows.Forms.AxHost.GetOcxCreate()    at System.Windows.Forms.AxHost.TransitionUpTo(Int32 state)    at System.Windows.Forms.AxHost.CreateHandle()    at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)    at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)    at System.Windows.Forms.AxHost.EndInit()    at AcrobatChecker.Viewer.InitializeComponent()    at AcrobatChecker.Viewer..ctor()    at AcrobatChecker.Form1.btnViewer_Click(Object sender, EventArgs e)    at System.Windows.Forms.Control.OnClick(EventArgs e)    at System.Windows.Forms.Button.OnClick(EventArgs e)    at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)    at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)    at System.Windows.Forms.Control.WndProc(Message& m)    at System.Windows.Forms.ButtonBase.WndProc(Message& m)    at System.Windows.Forms.Button.WndProc(Message& m)    at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)    at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)    at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

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• Loose coupling of COM in C# or How to avoid COMException 0x80040154

  - by user283318

  I have a .Net 2 C# application I am developing which uses a VB 6 generated COM DLL. The VB DLL is updated frequently any my application crashes with a System.Runtime.InteropServices.COMException (0x80040154). The part of the COM DLL I use does not change but the version (and CLSID) will. The "Specific Version" option for the reference is false. The WrapperTool is tlbimp. How do I tell my application not to worry about changes in the DLL? Is there any way of checking just the functions I am using?

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• Outlook 2003 add-in - Getting COM exception on application shutdown after creating WPF window

  - by Oliver Hanappi

  Hi! I'm developing an outlook 2003 add-in. Until now I used only winforms to display one form, but today I've added a WPF window for more complex stuff. DUe to the WPF window, a COM exception is being thrown when outlook shuts down. Does anybody know why? I need to start a separate thread for the WPF window in single apartment state. Here is the exception: System.Runtime.InteropServices.InvalidComObjectException was unhandled Message="COM object that has been separated from its underlying RCW cannot be used." Source="PresentationCore" StackTrace: at System.Windows.Input.TextServicesContext.StopTransitoryExtension() at System.Windows.Input.TextServicesContext.Uninitialize(Boolean appDomainShutdown) at System.Windows.Input.TextServicesContext.TextServicesContextShutDownListener.OnShutDown(Object target) at MS.Internal.ShutDownListener.HandleShutDown(Object sender, EventArgs e) InnerException: Best Regards, Oliver Hanappi

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• Good freeware COM/ActiveX Type Library Explorer?

  - by Tomalak

  I used to have a dated, but valuable solution to display COM/ActiveX control- and type-library contents (ProgIDs, method names and signatures, enumerations, constants, interfaces/coclasses, etc.) of all such libraries registered on my system. It provided an Explorer-like overview of everything that was available to ActiveX development/scripting and served as an automatic API documentation tool since official docs for most COM/ActiveX libraries are either missing completely or fragmentary at best. My recent move to a 64bit Windows rendered the program I had unusable, due to internal dependencies on the 32bit VB6 runtime (comctl32.ocx) that is no longer supported on 64bit Windows. Does anyone know an alternative that still works?

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• Using COM to open Word

  - by chupinette

  Hello! I am actually trying some codes i found from http://php.net/manual/en/class.com.php <?php // starting word $word = new COM("word.application") or die("Unable to instantiate Word"); echo "Loaded Word, version {$word->Version}\n"; //bring it to front $word->Visible = 1; //open an empty document $word->Documents->Add(); //do some weird stuff $word->Selection->TypeText("This is a test..."); $word->Documents[1]->SaveAs("Useless test.doc"); //closing word $word->Quit(); //free the object $word = null; ?> But this does not seem to work. I am using Word 2007 and i get the following: Loaded Word, version 12.0 Fatal error: Call to undefined method variant::SaveAs() in C:\xampp\htdocs\final\testq.php on line 14 Can anyone solve this problem? Is it because i am using Word 2007?

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• Exposing .NET enums to COM clients{VBScript}

  - by Codex

  Am trying create of PoC for exposing/invoking various .NET objects from COM clients. The .NET library contains some classes and Enums. Am able to successfully access the classes in VBScript but not able to access the Enums. I know that Enums are value types and hence 'CreateObject' wont work in this case. But am able to access the same Enum in VBA code. Questions: How can I access the enums in VBScript? Why does the behaviour differ in the two COM clients? If VBA object browser can see the enum, why cant VBScript allow me to create one? .NET [ComVisible(true)] [GuidAttribute("ebc25cf6-9120-4283-b972-0e5520d0000E")] public enum Currency { GBP = CurrencyConvertorBL.CurrencyConvertorRef.Currency.GBP, USD = CurrencyConvertorBL.CurrencyConvertorRef.Currency.USD, INR = CurrencyConvertorBL.CurrencyConvertorRef.Currency.INR, AUD = CurrencyConvertorBL.CurrencyConvertorRef.Currency.AUD } VBA Private Function ConvertCurrency(fromCurrency As Currency, toCurrency As Currency) As Double VBScript ??? Set currencyConvertorCCY = CreateObject("CurrencyConvertorBL.Currency") Thanks in advance.

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• How does COM registration work in Windows

  - by Air Benji

  I'm an application packager trying to make sense of how the COM registry keys (SelfReg) interrelate to the given .dll in Windows. ProgID's, AppID's, TypeLibs, Extensions & Verbs are all tied around the CLSID right? Do CLSID's always use Prog/App IDs or could you just have a file extension class? Which bits are optional? Some of it seems to be 'like a router' where there's the two interfaces (internal - .dll) and external (the extension etc). How does this all fit? (The SDK documentation doesn't make sense to me) I ask as this is all pivotal to application 'healing' with Windows Installer (which packagers are all 'big' on, but there's no nitty-gritty breakdowns since its a coder-thing really) ---Edit: Am I safe in assuming that for what COM is registered, it must all link back to the CLSID and cannot be a 'dead-end'? Verbs need extensions which need progid's... What about the AppId's, TypeLibs and Interfaces? How do they interrelate?

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