COM

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Re: Sending Events from a DLL Abhishek Srivastava12-Dec-03 22:21 Abhishek Srivastava 12-Dec-03 22:21  Hi there, It is really very easy to implement events in your COM DLL. whenever u insert any ATL object in your ATL project, using ATL Object Wizard. ATL Object Wizard property box pop ups, go to attribute tab and select the check box "Support connection points" this will create an dispinterface which can contain ur event methods. now u have to simply add method in this interface. compile ur code . and then in class view select ur class which is going to implement this evennt interface, right click on it and add implement Connection point. a dialog box will pou up , select that event interface and click OK. Now just fire this event method from ur code. In ur VB client when just select ur Dll object . and it will list out all event methods implemented by ur dll Object. u can simply slect those event method and can code whatever u like. Abhishek Srivastava Software Engg (VC++) India ,Noida Mobile no 9891492921 COM/DCOM without ATL Kene12-Dec-03 3:40 Kene 12-Dec-03 3:40  Hi, I'm new to COM tech. My few COM experiences are just a few OLE Automation samples in MFC. But now I have a Project that will require me calling an object mtd across machine boundary. Can I achieve this in MFC 7.0? If yes how? Thanks in advance!;) What would life be without programmers and salesmen? Re: COM/DCOM without ATL valikac13-Dec-03 5:34 valikac 13-Dec-03 5:34  I recommend this book if you want to really develop COM servers. Developer's Workshop to COM and ATL 3.0 by Andrew Troelsen Kuphryn To COM or not to COM, that is the question ! Paul Silvernail11-Dec-03 2:14 Paul Silvernail 11-Dec-03 2:14  Before I self inflict an almost certainly painful COM education, I was hoping to get some opinions on the vitality of COM. Has COM seen it's glory days, or is it a technology still worth learning inside & out? Thanks for your ideas, Paul Re: To COM or not to COM, that is the question ! Heath Stewart11-Dec-03 12:21 Heath Stewart 11-Dec-03 12:21  It's still worth learning. If you're thinking of .NET, .NET is not a replacement for COM - merely an evolution of it. In fact, the CLR (Common Language Runtime) uses some COM technologies to make everything work and interop in a good manner. Also, many applications for Windows - including parts of Windows itself, like the shell - are written in COM. To make shell extensions - at least until Longhorn (and that's still a long way away, so who knows how it'll change) - you still need to use COM. Even using automation (runtime discovery) with Office, VBA, and scripting technologies (like the Windows Script Host, or even DHTML-scripting) uses COM and understanding what happens behind the scenes helps with that automation (but isn't required). If you want to add scripting capabilities to your application or to use embedding (OLE), you need to know COM. It's all over, and, IMHO, it's definitely worth learning. Just stock up on asperin!   -----BEGIN GEEK CODE BLOCK----- Version: 3.21 GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++ -----END GEEK CODE BLOCK----- Handling events with COM object as param NotProfessional10-Dec-03 8:51 NotProfessional 10-Dec-03 8:51  Hi, I am well done by responding COM events with simple data types( say VTS_I4). However, on topic that is not covered anywhere (and I spent days looking) is when the event has a COM object as a parameter. Say for instance in your sample that the addition is not on 2 integers but on 2 matrixes. The OnAdditionDone event would therefore pass a IMatrix * obj (VT_DISPATCH) pointer instead of an integer (VT_I4). How would you implement the event handler on the client side, and how would you actually start using the IMatrix pointer to access its members (tried everything I could think of, wither it doesn't compile or compiles but crashes, always get the 'first chance exception (OLEAUT32.DLL): 0xC0000005: Access Violation.). In other words, how to complete this: void CCoCaller::OnAdditionDone(IMatrix *result) { // How to implement this so that it works: BSTR str; result->get_Name(str); } MSDN gives 2 samples on how to implement IDispEventSimpleImpl and IDispEventImpl using Word and Excel veents, none of them show events that pass COM objects as parameters. Any help would be very useful. Thanks a lot Re: Handling events with COM object as param Abhishek Srivastava10-Dec-03 21:40 Abhishek Srivastava 10-Dec-03 21:40  Hi there , once i have tried the same also..and it worked fine. Suppose i have to pass IInterface instance to the client thru a Event method ThrowInter(IInterface *iFace) this is the code where i fired this event and passed the IInterface pointer. IInterface *iFace; CoCreateInstance(CLSID_Interface, NULL, CLSCTX_ALL, IID_IInterface, (void **) &iFace); Fire_ThrowInter(iFace); Now this is my client code where i caught the fired event and IInterface instance void CContainerDlgDlg::OnThrowInterTinterface1(LPDISPATCH interfac) { IInterface *iFace=reinterpret_cast<iinterface *="">(interfac); iFace->ShowMessage(); } but in client i have to include the header file of IInterface. and then simply reinterpret casting , i was able to access my IInterface methods and properties let me know if u r also doing the same Abhishek Srivastava Software Engg (VC++) India ,Noida Mobile no 9891492921 Re: Handling events with COM object as param Steve S11-Dec-03 5:37 Steve S 11-Dec-03 5:37  You really shouldn't do that, it's the kind of thing that gives COM a bad name. Better would be to get an IDispatch from the object and fire that, then use QueryInterface at the client end, or use IUnknown and do the same. If you remote (out of proc or off-machine) interfaces, then there is postively absolutely NO guarantee that your cast is safe, since a proxy/stub may well have only the same number of methods available in an IDispatch interface, and the rest of your interface's function table may/will be inadmissible. Steve S Re: Handling events with COM object as param NotProfessional11-Dec-03 9:42 NotProfessional 11-Dec-03 9:42  The key is I do not have the source code for the COM nor the header though. So I cannot include the header. Thanks for your suggestions anyway. Re: Handling events with COM object as param NotProfessional11-Dec-03 10:27 NotProfessional 11-Dec-03 10:27  Thanks so much, Abhishek! I got it done, the trick is I need to declare the LPDISPATCH and convert to my desired COM refrence type explicitly. However, I declare the handler function the same as what is described in .tlh! I want to correct is that you don t have to get the COM header, what you need is simply import the dll and use the smart pointer. Re: Handling events with COM object as param Vi211-Dec-03 2:54 Vi2 11-Dec-03 2:54  I think that you should write BSTR str;<br /> result->get_Name( & str ); Or better CComBSTR str;<br /> result->get_Name( & str ); With best wishes, Vita IIS - Automation - COM - ASP tourdata9-Dec-03 23:46 tourdata 9-Dec-03 23:46  Hello We have a big problem with our System. We developed a Web-Side with IIS and ASP and a Automation-Dll(COM) written in MFC 7.0. A User can login and the ASP creates the COM-Object in the ASP-Session-object. All Information are stored in the Com-Object. It's installed as in-Process and the COM-Object is set to Neutral-Threadingmodel. Now, when the COM-Object crash, sometimes the IIS restarts and all User have to login again. Sometimes the IIS can't restart and we have to restart the W2k Server. I changed the settings in the IIS to Out-Process (so it isn't in the same memory) but nevertheless the IIS restart on any COM-Object-Crash. What is the best way to develope a big existing MFC-Application to a COM-Object and using it as a WEB-Application with ASP. There are about 100 USer in the same time online.... Volker Re: IIS - Automation - COM - ASP Xiangyang Liu 刘向阳12-Dec-03 4:29 Xiangyang Liu 刘向阳 12-Dec-03 4:29  To prevent IIS crash, you could try to register your com object in COM+ as a "Server" application. Here is what you need to do: 1. Register your com object. 2. Create a blank COM+ app, make sure it is a "Server" not a "Library" app. 3. Import your com object (add it as a component to the COM+ app). Then you can use it in your ASP pages (by calling CreateObject). The com object will not be running within the IIS process. You have to test whether this solves your problem or creates a new problem, etc. The best approach is to fix the bug so that it won't crash, of course. Good luck. My articles and software tools How to call 16 bit component in a 32 bit Operationg system Mohan Babu D9-Dec-03 20:32 Mohan Babu D 9-Dec-03 20:32  Hi, I have a doubt. Can we make use of a component developed in 16 bit Operating system in 32 bit O.S. If yes, then how does a 16 bit component will be resolved in 32 bit O.S ? Is there any work around to call 16 bit component in 32 bit component ? Please give me a brief solution with example,if possible. Thank you Re: How to call 16 bit component in a 32 bit Operationg system Abhishek Srivastava9-Dec-03 22:05 Abhishek Srivastava 9-Dec-03 22:05  Hi dear u can call a component devloped in 16 bit OS in 32 bit OS using Thunking mechanism. there are 32-bit Generic Thunk Functions using which u can call ur component. One can also access the component devloped in 32 bit os in 16 bit OS ,using the same thunking mechanism for which u have to use 16-bit Generic Thunk Functions. u can refer to "THUNKING" topic of MSDN. Abhishek Srivastava Software Engg (VC++) India ,Noida Mobile no 9891492921 COM and ATL Judah Gabriel Himango9-Dec-03 5:49 Judah Gabriel Himango 9-Dec-03 5:49  I have a COM object I'm using in an ATL project. One of the COM object's exposed interfaces is called IWTonload. According to the COM object's documentation, a class implements the IWTonload by having a method in the class called .onloadComplete. In Java, I would go <br /> public myClass implements IWTOnLoad<br /> {<br /> ...<br /> void onLoadComplete()<br /> {<br /> }<br /> <br /> } In C# I would go <br /> public myClass: IWTOnLoad<br /> {<br /> void onLoadComplete()<br /> {<br /> }<br /> } How would I implement this IWTOnLoad COM interface in a C++ ATL project? Any help is greatly appreciated. The graveyards are filled with indispensible men. Re: COM and ATL Abhishek Srivastava9-Dec-03 21:52 Abhishek Srivastava 9-Dec-03 21:52  Hi there , In ATL it can be done very easily , insert an ATL class in ur project . Now insert ur component in the same project . In Class view , right click on ur ATL class , a menu will pop up , click on inplement interface. now browse for ur interface select it and click on implement. Abhishek Srivastava Software Engg (VC++) India ,Noida Mobile no 9891492921 Looking for a 'RPC/COM Call Monitor' tool ohadp9-Dec-03 2:00 ohadp 9-Dec-03 2:00  I've heared about such a tool by Microsoft, but I can't find it. I need to monitor all the COM/RPC calls a process makes... thanks Does this COM dll look unregistered? gregcost5-Dec-03 1:50 gregcost 5-Dec-03 1:50  Because it doesn't to me. Exception:---------------------------------------------------------------------------------- An unhandled exception of type 'System.Runtime.InteropServices.COMException' occurred in Test Form exe Additional information: COM object with CLSID {3050F48A-98B5-11CF-BB82-00AA00BDCE0B} is either not valid or not registered. From Registry:------------------------------------------------------------------------------ [HKEY_CLASSES_ROOT\CLSID\{3050F48A-98B5-11CF-BB82-00AA00BDCE0B}\InprocServer32] "Class"="mshtml.CEventObjClass" "Assembly"="Microsoft.mshtml, Version=7.0.3300.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" "RuntimeVersion"="v1.0.3705" [HKEY_CLASSES_ROOT\CLSID\{3050F48A-98B5-11CF-BB82-00AA00BDCE0B}\InprocServer32\7.0.3300.0] "Class"="mshtml.CEventObjClass" "Assembly"="Microsoft.mshtml, Version=7.0.3300.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" "RuntimeVersion"="v1.0.3705" From Gacutil /L: (GAC)---------------------------------------------------------------------- Microsoft.mshtml, Version=7.0.3300.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, Custom=null And Finally my own investigation of 3050f48a-98b5-11cf-bb82-00aa00bdce0b using--------------------------- Dim csCEventObjCLASS As New Guid("3050F48A-98B5-11CF-BB82-00AA00BDCE0B") Dim C_CEventObjCLASS As Type = Type.GetTypeFromCLSID(csCEventObjCLASS, True) CLASSName mshtml.CEventObjClass IsClass) TRUE IsCOMObject) TRUE IsInterface) FALSE IsPointer) FALSE Namespace) mshtml Module) MSHTML.dll Name) CEventObjClass GUID) 3050f48a-98b5-11cf-bb82-00aa00bdce0b Assembly) Microsoft.mshtml, Version=7.0.3300.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a Assembly.Location) c:\winnt.0\assembly\gac\microsoft.mshtml\7.0.3300.0__b03f5f7f11d50a3a\microsoft.mshtml.dll Assembly.CodeBase) file:///c:/winnt.0/assembly/gac/microsoft.mshtml/7.0.3300.0__b03f5f7f11d50a3a/microsoft.mshtml.dll Assembly.GlobalAssemblyCache) TRUE Assembly.FullName) Microsoft.mshtml, Version=7.0.3300.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a Assembly.GetCallingAssembly) System.Windows.Forms, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 Assembly.GetEntryAssembly) Test Form Focus, Version=1.0.1434.13227, Culture=neutral, PublicKeyToken=null Assembly.GetExecutingAssembly) Test Form Focus, Version=1.0.1434.13227, Culture=neutral, PublicKeyToken=null Assembly.GetExportedTypes) System.Type[] Assembly.GetFiles) System.IO.FileStream[] Assembly.GetLoadedModules) System.Reflection.Module[] Assembly.GetManifestResourceNames) System.String[] Assembly.GetReferencedAssemblies) System.Reflection.AssemblyName[] Assembly.GetModules) System.Reflection.Module[] AssemblyQualifiedName) mshtml.CEventObjClass, Microsoft.mshtml, Version=7.0.3300.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a FullName) mshtml.CEventObjClass Thanks, GregC Re: Does this COM dll look unregistered? Stephane Rodriguez.5-Dec-03 2:47 Stephane Rodriguez. 5-Dec-03 2:47  I don't think it's a matter of registration. After all Microsoft.mshtml is the interop assembly for InternetExplorer's mshtml.dll, and this wasn't registered Internet Explorer wouldn't work. This exception can be thrown more about an interop issue (bad use of objects or interfaces, or even if the object inside is not yet initialized. When I had this kind of issues last year, I tried adding code to my code sequence (even with stupid method calls) only to make sure the underlying objects were initialized and valid. Good luck!   RSS feed Re: Does this COM dll look unregistered? gregcost5-Dec-03 5:47 gregcost 5-Dec-03 5:47  Hi Stephane, Yes it is Interop but isn’t the underlying code in MSTHML.dll? Or am I missing something? The statement is also so simple. Dim objevent As New CEventObj() Of interest when I create a Console.WriteLine(objevent.returnValue), property in the CeventObjClass, Studio based on the dim does not complain and shows me the correct object list to select .returnValue from the class. Thanks, GregC Re: Does this COM dll look unregistered? gregcost5-Dec-03 5:55 gregcost 5-Dec-03 5:55  Hi Stephane, One more thing even if I spell it all out like Dim objevent As New mshtml.CEventObjClass() I get the same result Thanks, GregC Re: Does this COM dll look unregistered? Stephane Rodriguez.5-Dec-03 6:15 Stephane Rodriguez. 5-Dec-03 6:15  gregcost wrote: Yes it is Interop but isn’t the underlying code in MSTHML.dll? Exactly. Interop issues can be one of these, in order of importance : underlying (unmanaged) object not initialized bad parameter or interface marshalling security, access denied In your case, if could be an interop issue, but it could just be that the object you are using is lacking a context. I have just taken a look at mshtml.dll, and CEventObj is an interface, not an object. So you will never successfully create an instance of CEventObj (it's a pity that they have given it such a name). The implementation for the interface is CEventObjClass. Creating an instance of CEventObjClass should work better. That being said, I think it's best to stick with an existing sample. By default, I wouldn't pledge that you can create a useful and relevant instance of CEventObjClass by yourself. Most of the time with mshtml.dll, what you do is "get" objects down from the current document object. Your code might be ok, I don't know though.   RSS feed Re: Does this COM dll look unregistered? gregcost5-Dec-03 8:59 gregcost 5-Dec-03 8:59  Hi Stephane, Sorry, yes the dim I wrote as I was writing the message is the interface, I left off the Class suffix. I have tried it a bunch of different ways Dim objevent As New CEventObjClass() Dim objevent As New mshtml.CeventObjClass In fact none of the classes will work in the dll. I get the same COMException for any I try. What I’m actually trying is to get MS Knowledge Base Article 279535 to work. The short program uses a property in the class CEeventObjClass to disable script error checking for forms hosting a WebBrowser control. For whatever reasons Microsoft did not implement this disabling script feature for WebBrowser controls by selecting it from IE (even through it is really the same object). It is available for IE. So they supply you with a code example in VB6 not VB.net to address this problem. Actually I can understand why they did it this way because you might want to disable script error checking for IE but not completely across any applications that host Web controls on the same system. So since I’m trying to rework MS code I’m not flying to blind… Or am I!!!! Well, if you think of anything please let me know and thanks for your help! Thanks, GregC Re: Does this COM dll look unregistered? Stephane Rodriguez.5-Dec-03 9:33 Stephane Rodriguez. 5-Dec-03 9:33  Don't get it wrong, but I think you don't understand what you are doing. The support KB article you refer to NEVER creates an instance of the CEventObjClass. Quite the contrary, the only thing it does is change a property value on the event interface being passed by the IE event dispatch mechanism. In the support KB article, objEvent is that interface. It's created by IE and passed along to subscribers. Now that I know what's going on, I wonder what's your problem here. You just need to reproduce the code that is given in the support KB article. There is no "New event something " involved in here. Good luck!   RSS feed

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