COM

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How to enter CLSID in registry? SanjaySMK30-Dec-08 22:10 SanjaySMK 30-Dec-08 22:10  Hello, Even after making all the possible changes in the InstallShield, I am still not able to get the CLSID in the registry while installing a software. What changes do I have to make in the InstallShield to get it done or how to enter CLSID in the registry? thanks in advance. Software Developer Sanjay Khapre Re: How to enter CLSID in registry? Garth J Lancaster30-Dec-08 23:07 Garth J Lancaster 30-Dec-08 23:07  if its a COM component you usually call/use regsvr32 :- http://support.microsoft.com/kb/249873[^] 'g' Re: How to enter CLSID in registry? Randor 3-Jan-09 12:01 Randor 3-Jan-09 12:01  If you are asking how to progmatically register the COM objects its quite easy. You simply need to call DllRegisterServer[^] for each library and the registry entries for all classes should be entered into the registry. Some additional documentation: INFO: How Regsvr32.exe Registers and Unregisters COM DLLs[^] Best Wishes, -David Delaune How to catch CUT event of word file in windows xplorer? SNI25-Dec-08 22:24 SNI 25-Dec-08 22:24  Hi, I have an application which opens doc file in its container but at the same time it creates another doc file on the system. User CUT and Paste this doc any where. I want this to avoid. Either by restricting user to CUT file OR Paste this file. How to achive this? Pls Help Thanks SNI SNI Re: How to catch CUT event of word file in windows xplorer? PC Player26-Dec-08 8:58 PC Player 26-Dec-08 8:58  Could it possible to open your document in other Editor like Acrobat Reader (PDF Format). You can solve this problem very easy in PDF. In Word document you can handle this situation by using Macro but its long way. Thanks Ali Ali Zishan London Re: How to catch CUT event of word file in windows xplorer? SNI28-Dec-08 19:11 SNI 28-Dec-08 19:11  Thanks for your reply but i want the event of CUT for .doc file. SNI QueryInterface Regarding.... ganesa moorthy19-Dec-08 4:31 ganesa moorthy 19-Dec-08 4:31  Hi, My Program is supposed to run contineously so i need to concern about memory management with COM. Here is the scenario, I created a COM Object using CreateInstance() using that COM object i am creating another object using QueryInterface. Here is my question. 1. if i am releasing the first object which i got using CreateInstance, then subsequently the objects which are created using that will be removed from memory right? Since if i call release for object got using QI causing crash. But i am fine if i release the first object, but i am afraid this would lead to a memory leak issue. Kindly Advice! Thanks in advance -Ganesha Thanks a lot Re: QueryInterface Regarding.... Roger Stoltz19-Dec-08 5:07 Roger Stoltz 19-Dec-08 5:07  Unless the second object is aggregated in the COM sense, i.e. it's a server that lives inside another server, thou-shall-not-create-objects-with-QueryInterface! QueryInterface has a well-defined purpose and functionality: you ask a COM object you already have an interface to for another interface, the object returns that interface if it implements it and fails with E_NOINTERFACE if it does not implement the requested interface. If such functionality is desired you should create an interface function that clearly says it will create another COM object. ganesa moorthy wrote: if i am releasing the first object which i got using CreateInstance, then subsequently the objects which are created using that will be removed from memory right? Not if the object still has clients, i.e. it's reference count has not reached zero. It looks to me as you two objects are too tightly connected. If you make them available in the same server (COM object) but perhaps reachable from different interfaces, you can use QueryInterface correctly. Another alternative is to make the two objects less connected and actually have two different COM objects. "It's supposed to be hard, otherwise anybody could do it!" - selfquote "High speed never compensates for wrong direction!" - unknown COM and COM+ ? sajjadlashari18-Dec-08 17:35 sajjadlashari 18-Dec-08 17:35  Dear All I have very simple question what is difference between COM and COM+ What are the uses of these both technologies Thanx in advance Sajjad Re: COM and COM+ ? CPallini23-Dec-08 2:58 CPallini 23-Dec-08 2:58  I think asking Google will be useless [^], in you case. If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile. This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke [My articles] Re: COM and COM+ ? PC Player26-Dec-08 9:09 PC Player 26-Dec-08 9:09  Hi, COM+ is a refined version of COM. COM+ also supply a number of service to component running under Windows, including 1. Role-based security 2. Object pooling and reusability 3. Queued components for asynchronuous calls 4. Transaction processing 5. A publish-and-subscribe events model Ali Zishan London Re: COM and COM+ ? guestcat29-Jan-09 5:50 guestcat 29-Jan-09 5:50  Hi, Basically COM+ = COM + MTS (microsoft tranaction server). COM+ is built using Aspect Oriented Design. Aspect oriented design are like some aspects(security, pooling etc) that you can use from the framework and not required to progrm by yourself. this is what COM+ provides once you create a COM+ application and register you componet with that. ^-^ @|@ - redCat Issue with SysFreeString... ganesa moorthy17-Dec-08 17:54 ganesa moorthy 17-Dec-08 17:54  Hi, I am having a COM Component and i am accessing the com using VB client. In Com function i am using SysFreeString, i am calling a function inside COM DLL by passing a string argument from vbclient. After usage i am calling SysFreeString inside the com function. The above mentioned functionality works on several machines and fails(VB client crashes) in one machine. I removed the SysFreeString function call from the failing machine, and now it is fine. Can anyone tell why this happens so strangely ? Anyway we need to call SysFreeString to free up the memory. Kindly guide me! Advanced Thanks, Ganesha Thanks a lot Re: Issue with SysFreeString... Jonathan Davies18-Dec-08 2:38 Jonathan Davies 18-Dec-08 2:38  Hi, I can't say why one machine behaves differently, in fact I would say if you can fix the code so it works on all machines you don't need to know. All my VB -> COM was done in Visual Studio 6 and used IDL rather than attribute based which yours may be but the issues should be the same. What IDL attributes are applied to the string being passed, an [in] or [in,out] or possible [retval]? As you are freeing the string in the .dll, I'm assuming its an [in]? Re: Issue with SysFreeString... ganesa moorthy18-Dec-08 2:42 ganesa moorthy 18-Dec-08 2:42  Hi, [in], [out], and sometime [out,retval] Advanced Thanks!!!! Thanks a lot Re: Issue with SysFreeString... Jonathan Davies18-Dec-08 2:56 Jonathan Davies 18-Dec-08 2:56  That seems right, I think VB passes strings by reference so it has to be [in,out]. As there is an out] part, VB expects a string to be passed back (out) and is probably deleting this according to some garbage collections algorithm - but you've already done it in the dll. I think not deleting it in the .dll is OK here - you would only do this if it were an [in]. You could delete it in the dll but only is you then assign a new string to it for the [out] part - it's this [out] part that VB is expecting and deleting. Re: Issue with SysFreeString... GuimaSun29-Jan-09 8:50 GuimaSun 29-Jan-09 8:50  After deallocating with sysfreestring, are you providing a new value with sysallocstring ? GuimaSun www.nexsun.com.br NEXSUN TechZone An activex control to run VLC player from command line rajjesh16-Dec-08 15:03 rajjesh 16-Dec-08 15:03  As a part of my project I would like to develop an activex control, whose functionality should be similar to passing vlc.exe(exe file of the vlc player) and the name of a encoded video stream as inputs to the command line. Please provide me with any links to a similar project. Thanks in advance Obtaining COM DLL output with free tools Zeddan15-Dec-08 22:54 Zeddan 15-Dec-08 22:54  I am currently trying to learn the basics of Interoperation in .NET. As a step towards that goal I would like to create my own COM DLLs to be imported and used in managed code. I would like to know a way to get COM DLLs as output in VB or C++ with free tools. Any recommendations? Re: Obtaining COM DLL output with free tools Baltoro27-Dec-08 7:51 Baltoro 27-Dec-08 7:51  I hope you have a sense of humor,... You can do this in Assembly Language (and, it's insanely fun). OK, I'm torturing you,...it's a pain in the ass (but, definately possible). I would recommend Visual Studio (because it has a number of great Interoperability Tools, and comes with the latest NET Framework). The Standard Edition is somewhere between $100 and $150. If you plan to do alot of COM, it's a good investment. Defining struct in IDL file KASR114-Dec-08 20:12 KASR1 14-Dec-08 20:12  I have defined a struct type in IDL as follows typedef struct tData { int i; int j; tData() { i = 0; j = 0; } }MyData; Getting error as follows. error MIDL2025 : syntax error : expecting a type specification near "tData". Why COM DLL Fails in one system and working fine in another system? ganesa moorthy14-Dec-08 16:51 ganesa moorthy 14-Dec-08 16:51  Hi, I am having a COM DLL which is working fine in three Windows 2003 installed machines. But Fails in another machine which has same windows 2003. What could be the possible cause of this ? Advanced Thanks , Ganesamoorthy Thanks a lot Write Speed supported by drive Kiren Mukherjee11-Dec-08 19:53 Kiren Mukherjee 11-Dec-08 19:53  Is it possible to get the write speeds supported by a drive (media device) using IMAPI interfaces. I have tried with the "get_SupportedWriteSpeeds" and "get_SupportedWriteSpeedDescriptors" API's of "IDiscFormat2Data" inteface. But both of them returns speeds specific to a media (CDR / DVD-R etc) inserted. SKMukherjee Why COM Varghese Paul M10-Dec-08 22:21 Varghese Paul M 10-Dec-08 22:21  Hi Experts, I am new to COM programming. (Component Object Model.) After learning some theory behind COM, I am wondering Why COM when every thing is possible using DLLs which exports C++ classes. Or What is possible only in COM and not possible in C++ DLLs. Could anyone explain? Thanks in advance cheers Varghese Paul Re: Why COM Fernando A. Gomez F.11-Dec-08 5:41 Fernando A. Gomez F. 11-Dec-08 5:41  Hi there. This article might be useful I believe. What you suggest is treated in the "C++ Naive Approach: Exporting a Class" section, whereas the COM approach is similar to the described in the "C++ Mature Approach: Using an Abstract Interface" section. In short, there are many problems with simply exporting classes from a DLL. If you change a dependency, most likely you'll have to recompile them all. You have to have the same compiler and even compile with the same settings. A nightmare if you're planning on distributing your components to other people. Cheers. Stupidity is an International Association - Enrique Jardiel Poncela

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