COM

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connection points of custom event in exe 5-May-01 17:48 5-May-01 17:48  when I added the custom event in the dll-server ,which means the event interface inherits from IUnknown ,I can Advise using Sink-Object from the client code . But when the server is exe , Advise failed from the client code .Why? COM threading question... Amit Dey4-May-01 5:50 Amit Dey 4-May-01 5:50  In one of my articles I wrote how we can use a VB activex dll component in a VC app. The problem is that when I try to create the component from a new thread, everything bonks. Is this a threading problem? I think my activex dll is apartment threaded(STA) whereas I wanna use it in an MTA. Hence the problem.... So what's the solution? Maybe I can use an activex exe cause it runs in it's own thread.. Any comments/help is welcome. TIA. Hush..Hush.. thought I heard you calling my name now... ATL COM Service Install Trouble Garth J Lancaster3-May-01 21:07 Garth J Lancaster 3-May-01 21:07  Gidday (dead give-away where I live) .. Im pretty new at this so dont shout too loud if I mess up.. Anyway - I have an NT Service, based on service generated by the ATL wizard (VC++ 6.0). The Service will install on NT 4.0 Workstation, NT 4.0 Enterprise Server 64 bit encryption. It wont however install on NT 4.0 Enterprise Server 128 bit encryption - the UpdateRegistryFromResource call appears to fail in the CserviceModule::RegisterServer code, but its real hard to figure out what the error means ... 'Class not registered' - I have used "service.exe /regserver" Just a thought Im having, is, should I install VC++ on the new platform (Its installed on a 64 bit encryption platform) compile and generate the code with a new GUID ??? Has anyone else got any ideas, short of pulling off that 128 bit encryption version of NT Server, and installing a 64 bit version ?? (this appears to be the only real difference in the machines...) Garth Lancaster g.lancaster@mbf.com.au Re: ATL COM Service Install Trouble Garth J Lancaster4-May-01 14:38 Garth J Lancaster 4-May-01 14:38  'bugger' - I just realised that our e-mail system will be down till 5pm Saturday Australia time (=18 to 22 hours ahead of the states) .. snigger - this means that you cant flame me directly - as you might tell, my Net experiences havent been great so far - there are more people out there interested in nit-pickin and flaming than there are in helping, imho In the meantime, Im going to install Visual Studio Pro on the NT Server with the Enterprise Server 4.0 128 Bit encryption version on it, build a nothing ATL COM Service with the wizard, and see if that works .. 'G' G J Lancaster Re: ATL COM Service Install Trouble Garth J Lancaster7-May-01 0:05 Garth J Lancaster 7-May-01 0:05  Almost the end of the saga .. after installing VC++ on the NT Server (4.0 Enterprise, 128 bit encryption), I generated the same dummy ATL_Service using the wizard ... and it installed and ran .. so then I tried the original service that wouldnt install.. and lo and behold it worked, too.. so Im almost happy .. I say almost, because I still really do know what went on here, and why installing VC++ fixed it. If anyone out there has been watching this, and knows the answer, please put me out of my (semi) misery regards from 'Down Under' Garth Re: ATL COM Service Install Trouble 7-May-01 11:09 7-May-01 11:09  If you didn't specify _ATL_STATIC_REGISTRY atl will try to use "Registrar" component to register your server and probably this component was not installed on your server. Edward Re: ATL COM Service Install Trouble Garth J Lancaster8-May-01 14:38 Garth J Lancaster 8-May-01 14:38  Thanks Edward ... If Id have known that on Saturday, I would have had an easier time CUL, Garth _ATL_MIN_CRT SuperGeek1-May-01 13:36 SuperGeek 1-May-01 13:36  Hello all the ATL/COM/C++ gurus!!! The little and unnoticed ATL beginner desparately needs your help. I am trying to build my project with ReleaseMinSize configuration with _ATL_MIN_CRT flag. Note that I don't have any runtime header files included, but I use #import-ed VB-based COM objects. Note that I disabled "exception handling" mechanisms and MFC support. All data types I am using are _com_ptr_t, _bstr_t, _variant_t from import-created .tlh and .tli files, plus regular C/C++ scalar types. My problem: link error 2001 with the bunch of unresolved external symbols. Does anyone know where the problem is. BIG TIME thanks to all with the BIG heart. Kirill. Re: _ATL_MIN_CRT Michael Dunn1-May-01 16:54 Michael Dunn 1-May-01 16:54  Those xxx_t types are provided by the C runtime library (CRT). Defining _ATL_MIN_CRT means your binary doesn't link with the CRT. Since your code needs the CRT, you get an unresolved symbol. Remove the _ATL_MIN_CRT symbol to fix this. The help page on LNK2001 has more info. --Mike-- http://home.inreach.com/mdunn/ The Signature, back by popular demand: Buffy. Pajamas. Re: _ATL_MIN_CRT Felix Cho1-May-01 17:30 Felix Cho 1-May-01 17:30  If possible, you may also use raw_interfaces_only and raw_native_types with your #import directive, then subsitute _com_ptr_t, _bstr_t, _variant_t with CComPtr/CComQIPtr, CComBSTR and CComVariant. Re: _ATL_MIN_CRT SuperGeek2-May-01 6:28 SuperGeek 2-May-01 6:28  Thanks Felix. This will definitely raise me from ATL HELL. The problem with those #import's - lack of documentation and examples. I only understood no_namespace, rename_namespace, rename and named_guids (the easiest ones). All other flags had been complete mystery. Kirill. Re: _ATL_MIN_CRT SuperGeek2-May-01 6:19 SuperGeek 2-May-01 6:19  Mike, thanks for an assurance!!! I knew that this issue was related to .tlh and .tli files, but could not put a period after my speculations. Kirill Snap-in resources Paul Rogan1-May-01 5:40 Paul Rogan 1-May-01 5:40  Hello, I am looking for a way to add menu items and toolbar bitmaps through registration of a COM object and using component categories. I have seen the "WordPad snap-in" sample in MSDN and the interfaces defined here pass HMODULE's to the main application so it can load directly from the dlls resources (specically bitmaps/strings and menus) I have a problem and a question. 1.) I get error on MIDL(MIDL2139) compiler because HMODULE is of type void or void*... 2.) Should COM objects do this sort of thing? or should all resource items be stored in a main application - this kindof defeats the object of me designing my app + "snap-ins" to make adding functionality a question of simply registering a dll..... If anyone can show me an example of how this sort of thing can be done or any pointers you can give me that would be great. thanks programers mohan30-Apr-01 22:49 mohan 30-Apr-01 22:49  hi i hve requirements in UK on VC++ with MFC/COM in telecome and embeded systems with 2.5 years exp. and also on GSM. if aou ar ethe on esen dyour cv to naidumg@yahoo.com Mohan MFC ATL dll link error 30-Apr-01 6:03 30-Apr-01 6:03  Sorry guys I'm pretty new to ATL and COM stuff. The project is a shell extension with MFC support. Been looking at the tutorials on it over and over but can't find out how to fix this problem. After starting a new project I can get it to work. Then after compiling a few times (changing nothing) it ends up giving this link error. It starts happening randomly but never goes away once I first get it. Linking... mfcs42.lib(dllmodul.obj) : error LNK2005: _DllMain@12 already defined in MSVCRT.lib(dllmain.obj) mfcs42.lib(dllmodul.obj) : warning LNK4006: _DllMain@12 already defined in MSVCRT.lib(dllmain.obj); second definition ignored Creating library ReleaseMinSize/program.lib and object ReleaseMinSize/program.exp ReleaseMinSize/program.dll : fatal error LNK1169: one or more multiply defined symbols found I can start a new project, transplant the code, and have it working for a while till I get this again. I've had to include afxcmn.h, and change my .cpp files to automatic use of precompiled headers. But apart from that I've not really changed anything. I can get the code to work fine in a nonMFC dll (without using MFC components). Removing all MFC statements I've added doesn't help either. Any idea on how to fix this? Thanks -Neil Re: MFC ATL dll link error SuperGeek1-May-01 13:22 SuperGeek 1-May-01 13:22  Got the similar problem with MSVCRT.lib myself except my project does not link at all ;( I hope this one helps you: Look at your Project Settings -> "C/C++" tab -> "category" combo -> drop "category" combo to "Preprocessor" -> -> look at "Preprocessor definitions:" edit box. If you find _ATL_MIN_CRT, remove it for all project configurations except "Debug". This flag tells compiler not to link your project with any Microsoft Standard Runtime Libs (for minimum size). If you include "MFC support", MFC requires those runtimes linked to your project - that's where collision occurs. Since you don't have any problems while MFC's presence is disabled, that sounds like my case. Kirill. Re: MFC ATL dll link error 1-May-01 17:18 1-May-01 17:18  Thanks for the reply. I haven't got _ATL_MIN_CRT in my preprocessor definitions it seems. This is what I have: WIN32,NDEBUG,_WINDOWS,_WINDLL,_AFXDLL,_MBCS,_USRDLL,_ATL_DLL Removing _ATL_DLL doesn't seem to help. Removing _AFXDLL creates more errors ofcourse. The strange thing is I can link the project after creating a new one, and notice no differences in any project settings after it starts having this link error. I've tried deleting some different generated files but that hasn't helped so far either. Any ideas? Thanks Re: MFC ATL dll link error 1-May-01 20:16 1-May-01 20:16  Sorry guys, fixed it now. I was using memset and including memory.h in one of my classes which seemed to cause it. Although I could comment out the memset and include statements, build it, uncomment them and build again and then it'd work. Although gives a warning: LINK : warning LNK4089: all references to "MSVCIRT.dll" discarded by /OPT:REF Which is good I guess. Can't see any options or flags that may have changed to cause this though. Interface Inheritance Paul Rogan30-Apr-01 1:22 Paul Rogan 30-Apr-01 1:22  Hello, I am new to COM/ATL programming and have a question. If I want to inherit one interface from another I have previously written (e.g. IB : IA ) do I need to implement all of IA's methods in IB? if so is there any way I can use some technique that allows you to just directly call the IA method instead of having to re-write (as in C++). Thanks. Paul. Re: Interface Inheritance Pete Bassett30-Apr-01 1:38 Pete Bassett 30-Apr-01 1:38  Check out Agregation Re: Interface Inheritance Paul Rogan30-Apr-01 1:54 Paul Rogan 30-Apr-01 1:54  I have had a look at aggregation - could I override methods from my base interface using this? e.g. where IB : IA IA* pIA = null pIB->QueryInterface(IID_IA, &pIA) 1) pIA->methodA() 2) pIB->methodA() would 1) call the same thing as 2) -- I think it would if these were C++ classes (using cast instead of QI). help! Re: Interface Inheritance Ryan Park2-May-01 7:59 Ryan Park 2-May-01 7:59  Sure. 1) and 2) will call same function implementation. I don't quite catch your intention. This is just simple class or struct inhertance. This is nothing to do with COM as I understand. What do you want to do? Regards, Ryan Query a specific COM DLL for an interface Martin Eskildsen29-Apr-01 21:21 Martin Eskildsen 29-Apr-01 21:21  Hi, Can anybody tell me how to find out if a COM DLL has implemented a specific interface. All I know is the name of the DLL and the CLSID of the interface. I gues Microsfot is doing something similar when they implements add-ins to both Developer Studio and office? Martin Eskildsen Re: Query a specific COM DLL for an interface Michael Dunn29-Apr-01 22:48 Michael Dunn 29-Apr-01 22:48  This is what QueryInterface() does. --Mike-- http://home.inreach.com/mdunn/ The Signature, back by popular demand: Buffy. Pajamas. Re: Query a specific COM DLL for an interface Martin Eskildsen29-Apr-01 23:15 Martin Eskildsen 29-Apr-01 23:15  Ok - I also thought about QueryInterface in the first place, both I can't figure out how to use it on a spefic DLL (only given the filename of a COM DLL to query the specific DLL wheter it supports the requested interface since). A short example might make my question more clear: I have an executable (MyProg.exe) and two COM DLL's (MyDllA.dll and MyDllB.dll). Both Dll's is allowed to support the requested interface (like add-ins in Developer Studio). In this sample both DLL's supports the interface called IMyInterface, with CLSID CLSID_MyInterface. How can I use QueryInterface in combination with the information above to verify that both DLL's support the interface IMyInterface? Martin Eskildsen

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