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Re: Can somebody please answer this? Stuart Dootson3-Jul-02 14:47 Stuart Dootson 3-Jul-02 14:47  Whoops - just read your message properly - you say you're using C, as opposed to C++, so this may have been of no use whatsoever Stuart Dootson 'Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p' Unregistered objects Stuart Dootson3-Jul-02 14:21 Stuart Dootson 3-Jul-02 14:21  OK - not really a problem, but is there anything supremely wrong with this: I've got some COM objects I'm using as helpers to get a scripting application (using IActiveScript with a user-selectable script engine) working (specifically, I've got an IActiveScriptSite implementation and some IDispatch-based objects that I'm inserting into the scripting namespace with IActiveScript::AddNamedItem). BUT...these objects are not registered COM classes, because they're just classes in a standard Win32 executable, not a COM server executable - I create them using 'new CComObject<class name>' and manage them with _com_ptr_t..or is it CComPtr - can't remember which right now. It all seems to work - but is there any reason that I should be using properly registered servers & objects & things? Stuart Dootson 'Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p' Re: Unregistered objects Scot T Brennecke6-Jul-02 4:50 Scot T Brennecke 6-Jul-02 4:50  Nope. If you're not going to use the objects outside the scope of your application, there's no reason to register them. Scot Brennecke Software Developer VC++ MVP First Time COM user w/ MSXML electronicman_x3-Jul-02 9:35 electronicman_x 3-Jul-02 9:35  I'm trying to utilize Microsoft's MS XML 4.0 parser to obtain some data from an XML file. I'm using C++ so im I'm having a bit of trouble writing a simple console app that can find an XML node of my choice and retrieve data associated with it. I am trying to utilize the XML DOM Method GetAttribute. (as seen on MSDN @ http://msdn.microsoft.com/library/en-us/xmlsdk/htm/xml_mth_dg_5rfo.asp I've worked through another example tutorial which creates a very simple app that loads the whole XML document and prints it to screen. I have no trouble with that but when I tried to utilize the MSDN example for GetAttribute, the code is riddled with problems and I have been unable to over come them. I'm sure if i saw a simple app that did what i was looking for i would understand how to use this better, but i have looked all over for such an animal and they are either way too big or way to simple to get anything from them. I am also having some troubles fully understanding _variant_t and _bstr_t. If anyone can provide some advice or a very simple example (like something that can read 10 line xml file and find one tag in it and print its data), I would be grateful. PS: My problem may stem from: GetAttribute code: MSDN says it takes two parameters but it will not compile that way. SetAttribute appears to take similar parameters and it will compile with 2 parameters. Thanks Jeff Rothenberg Project Engineer Vector CANtech, Inc. Addin load problem Zizilamoroso3-Jul-02 4:38 Zizilamoroso 3-Jul-02 4:38  I've followed the tutorial about creating office addin's. The one I've created is an excel addin. It doesn't do anything, it's just a minimal addin. But it doesn't show up in the excel addin-list, even though it's registered in windows registry. The loadbehaviour should be set to 3 for automatic loading. After compiling the project, using regedit shows 3 for loadbehaviour. So far so good. But after running excel, eyeballing the addin is not there, the loadbehaviour in regedit changed to 2 ?????? What's going on here? [VISUAL STUDIO 6.0] [MFC] [WIN98/2] Bluute tette! Re: Addin load problem Amit Dey4-Jul-02 10:31 Amit Dey 4-Jul-02 10:31  Hi, as far as Excel addin is concerned, there are a few caveats as I have found out. If you have followed my tutorial and have a bare bones COM dll ready, to properly register it here's some info: 1) the registration key is to be created as usual at HKCU(or HKLM)->Software->Microsoft->Office->Excel->Addins->[Your Addins ProgID]. Now under this, apart from the usual FriendlyName,LoadBehavior and Description, you have to add 2 more entries. These are : FileLocation - a string value of the physical path where the dll is located. CommandLineSafe - a DWORD value(0 - unsafe 1-safe) thus for my ATL Excel2000 addin project, the additions to the registry script(.rgs) are: HKCU { Software { Microsoft { Office { Excel { Addins { 'XLAddin.Addin' { val FriendlyName = s 'Excel2000 Addin' val Description = s 'ATL COM Excel Addin' val LoadBehavior = d '00000003' val CommandLineSafe = d '00000001' val FileLocation = s '%MODULE%' } } } } } } } with this, my addin gets loaded at startup.now as to the weird registry value changes, if the CommandLineSafe is 0,(i.e. addin is not safe to load) or the entry is missing ,Excel increments or decrements the LoadBehavior value, as some kind of a precaution. happy addin programming. 'My capacity for happiness', he added, 'you could fit into a matchbox without taking out the matches first'. - Marvin, the robot. Amit Dey sonork: 100:18407 msn: visualcdev Re: Addin load problem Zizilamoroso5-Jul-02 6:45 Zizilamoroso 5-Jul-02 6:45  ok tnx will try it... [VISUAL STUDIO 6.0] [MFC] [WIN98/2] Bluute tette! Get the caller thread Id of a marshalled interface 2-Jul-02 7:46 2-Jul-02 7:46  do you know in a method call how to get the caller thread id if the interface has been marshalled ? the problem is if the interface has been marshalled the GetCurrentThreadID return obvously the ID of the marshalled thread on which the interface has been marshalled. But how to get the thread id of the calling thread ? thanks in advance Re: Get the caller thread Id of a marshalled interface Len Holgate4-Jul-02 12:42 Len Holgate 4-Jul-02 12:42  why do you need to know it? Len Holgate www.jetbyte.com The right code, right now. Re: Get the caller thread Id of a marshalled interface 4-Jul-02 21:50 4-Jul-02 21:50  Len, it's funny you answer with a question anyway it's a bit complicated to explain in few words. I've used the IMessageFilter and it's not perfect but it works (only in STA) ciao Re: Get the caller thread Id of a marshalled interface Len Holgate4-Jul-02 22:22 Len Holgate 4-Jul-02 22:22  Anonymous_com wrote: it's funny you answer with a question It's the only way to be sure that the person asking the question is asking the right question. There's no point in diving in to answer a question if you don't understand why the question is being asked and the context in which your answer will be used. This is especially true when the question is 'strange' ie something that you don't think the questioner should need to know. Often such a question arises from the fact that someone's already made a whole load of decisions to get to the point where they need to ask the 'strange' question. So by finding out why they need to ask the question you can often point out a more conventional way to solve the actual problem that they have and in doing so remove the need to answer the original question. However, you don't give me any context, so I'll guess You may be attempting to deal with reentrancy issues during COM method calls. I'd solve the problem differently Len Holgate www.jetbyte.com The right code, right now. Re: Get the caller thread Id of a marshalled interface 4-Jul-02 22:43 4-Jul-02 22:43  Len, nothing to do with reentrancy issues during COM method calls. I've got an interface marshalled between different threads and the interface under certain circumstancies need to know which thread has been calling to provide different services because this thread is not so safe to produce good result using this method. The problem of marshalling an interface is that during the method call the GetCurrentThreadId obviously return the marhsalled thread id ciao Re: Get the caller thread Id of a marshalled interface Len Holgate4-Jul-02 22:49 Len Holgate 4-Jul-02 22:49  Anonymous_com wrote: I've got an interface marshalled between different threads and I'd do it differently Len Holgate www.jetbyte.com The right code, right now. Re: Get the caller thread Id of a marshalled interface 4-Jul-02 23:29 4-Jul-02 23:29  do I have to pray you to know how ? Re: Get the caller thread Id of a marshalled interface Len Holgate5-Jul-02 0:05 Len Holgate 5-Jul-02 0:05  Anonymous_com wrote: do I have to pray you to know how ? No, but I need a little more information. So back to my original question. Why do you need to know the thread id. Or, more precisely, why do you need to act differently depending on the caller's thread. I guess I'm asking what the 'certain circumstances' are and why the "thread is not so safe to produce good result". Once I know this, I can answer Len Holgate www.jetbyte.com The right code, right now. Re: Get the caller thread Id of a marshalled interface 5-Jul-02 0:13 5-Jul-02 0:13  Len, you're tech teaser (no offense) well, you can imagine this scenario as a super marshal : certain threads cannot perform some operation on certain methods. This could be achieved splitting the interface but at the moment it's impossible Re: Get the caller thread Id of a marshalled interface Len Holgate6-Jul-02 0:57 Len Holgate 6-Jul-02 0:57  Anonymous_com wrote: well, you can imagine this scenario as a super marshal : certain threads cannot perform some operation on certain methods. This could be achieved splitting the interface but at the moment it's impossible What I find difficult to reconcile is the fact that the knowledge of when the operation can safely be called by a particular thread is being placed in the object, rather than in the thread. If the thread deals with this issue then your problem goes away. The ideal solution is splitting the interface as you say. If that's not possible then personally I'd prefer to put the code that decides if the call is allowable or not on the caller's side of the interface rather than on the object's side. Doing it the way you're doing at the moment is likely to come back and bite you at a later date Not amazingly helpful advice I know but I usually find it's worth dealing with the pain of these kinds of problems straight away - ie refactor the interface and adjust the design - rather than patching in a quick fix and finding myself with strangeness occurring just as I'm about to ship the product. This code from Dharma Shukla's CoHack pages might help. Len Holgate www.jetbyte.com The right code, right now. Kill a non-responsive COM Object Anders Molin2-Jul-02 1:18 Anders Molin 2-Jul-02 1:18  Is there any way to kill a COM Object which I have started. Normally I create the COM Object, and when I'm done with it I call obj->Release(); to decrease the ref. count. But what if the COM Object stops responding? Is there anyway to kill it... Something like: KillComObjectNow(obj); I know I know, it might cause resourse/memory leaks and stuff, but... The problem is that I'm writing a server-thing for which people can write plug-ins/extensions in COM, and if one of those stops responding I want to kill it... - Anders Money talks, but all mine ever says is "Goodbye!" Re: Kill a non-responsive COM Object Rama Krishna Vavilala2-Jul-02 6:35 Rama Krishna Vavilala 2-Jul-02 6:35  You can use MessageFilters, look at IMessageFilter Re: Kill a non-responsive COM Object soptest2-Jul-02 12:32 soptest 2-Jul-02 12:32  will not work in MTA. soptest How to use an OCX yuval30-Jun-02 21:02 yuval 30-Jun-02 21:02  Hi All, I encountered the following problem: I succeeded using an ocx file through one exe file, while didn't succeed doing it through another exe. In Details: I wrote an exe file, that addresses a dll. This dll consists of a dialog, on which I added an ActiveX component (as a control). This activeX component is an OCX file. It all worked very well: I managed interacting with that ocx. Everything was perfect. Now the problems begin: I wrote another exe, which, using the same principle, addresses the dll (mentioned above). But the program crashed. While debugging, I see the there's no problem getting from the exe to the DIALOG on that dll, but the program fails when trying to address the OCX on the dialog. I also saw that the problem relates to the CONTAINING and WRAPPING of the ocx: Two pointers: COleControlContainer* m_pCtrlCont, and COleControlSite* m_pCtrlSite have NULL value (both members of class CWnd, in file afxwin.h). What seems to be the problem? Why can't I address that ocx from the other application? I work Visual C++ 6.0, Windows NT. Thanks a lot. Re: How to use an OCX Ernest Laurentin1-Jul-02 8:49 Ernest Laurentin 1-Jul-02 8:49  Call AfxEnableControlContainer(); in CYourApp::InitInstance. Last Article: Client/Server Socket class Change path of an open Windows File Open/Save common dialog Jonatan Dahl30-Jun-02 12:33 Jonatan Dahl 30-Jun-02 12:33  Hi! How do I do start, which method do I use if I want an already open Windows file Open/Save dialog to change path? Thanks! /Jii Enlist the Transaction of two transactional com+ object Lizp28-Jun-02 22:51 Lizp 28-Jun-02 22:51  Object A was configged as "Requer Transaction" property and Object B(Actually is a databass access object to oracle and use ado to access to the datasource) was configged as "Supported Transaction" one.now A will invoke B and B must run in the Transaction context.is that practical and how to write the implement code of enlist the two transaction? thank you. Scratch Overwriting COM 28-Jun-02 4:38 28-Jun-02 4:38  Hi, i appologise if this question has been asked be before but its got me stummped, i need to overwrite one of the function pointers in a COM interface, i dont have access to the COM source nor can i modify it, i simply need to overwrite the pointer, i keep getting access violations.?? Goes something like this. IInterface * MyInterface= MakeInterface(); unsigned * vTbl = ((unsigned**)MyInterface)[0]; vTbl[THE_FUNCTION_INDEX] = NewFunction; Hope that gives you the idea of what i want, kinda like hooking a COM interface, i have yet to find an easy/any soloution like simply overwriting the functions pointer.

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