work com

operating system and the COM objects provided by third parties. This article assumes that you are proficient in C + + language. MFC and ATL are used in the example code, and if you are unfamiliar with MFC and ATL, this article will explain the code in a complete and thorough light. This article includes the following sections: What the hell is com--? --com Th

Since: http://www.vckbase.com/document/viewdoc? Id = 212 The purpose of this article is to provide a programming guide for programmers who have just come into contact with COM and help them understand the basic concepts of COM. The content includes the com standard introduction, important com terms, and how to reuse

Original: Http://www.codeproject.com/Articles/633/Introduction-to-COM-What-It-Is-and-How-to-Use-ItThe purpose of this article is to provide programming guidance to programmers who have just contacted COM and to help them understand the basic concepts of COM. The content includes a description of the COM specification ,

1, COM + Because of historical reasons, COM, DCOM and MTS are not very harmonious with each other, it is difficult to form a unified whole. COM + has effectively unified these three, forming a new, powerful component architecture. COM + is not a new version of COM, but a n

COM objects are encapsulated entities that provide services to users. This should be similar to the Class Object in C ++. But sometimes the COM object is treated as the class that provides services. The COM Object also encapsulates the data and provides interfaces. But there are some differences with the class. The data in the class can be declared as public, and

technology, which is no longer confined to a desktop system on a single machine, but rather targets a broader intranet, or even an international interconnection network. COM + and Multilayer architecture models (Windows DNA architecture, see the next section) and the Windows operating system provide a complete set of solutions for enterprise applications or Web applications."Problem". NET era, will COM dis

; · Internet Information Server (IIS) is a heavyweight weapon for Microsoft to join the battle of network servers. IIS includes many powerful com-based content series, such as Active Server Page, ISAPI extension and ISAPI filter; · Microsoft Transaction Server (MTS) is a database-oriented system. MTS adopts the COM technology to support mixed transaction processing of multiple database systems and vendin

languages in the world, there will be no idispatch. :-) We know that the COM component is a C ++ class and uses a virtual function table to call functions. For VC, there is no problem. This was originally designed for C ++, in the past, VB did not work. Now VB can use pointers, or vtable to call functions. VJ also works, but some languages still do not work, tha

number that is placed in the registry of the system, together with some relevant information, to uniquely identify the component. Client applications only dynamically build an instance of a component during run time and use the functionality of this component, so only one copy of the function library is required. Its disadvantage is that people often refer to the Quot;dll hell. This problem is raised when a DLL is to be replaced by a new version of the DLL. Developers have to use the method of

special qualities, to become ActiveX. I've been doing a lot of work on OLE, and I've even got some of the results I still see today. I used to check out the OLE books I had read before, and I saw the dense head notes and the fine ideas that I made with Word and Powerpoint, and some of the books I had already completed, and I was amazed to discover that I had already been to the same degree. But it is always after a moment of intoxication that a lit

bibliography or reference. But this book is like a book, "There are manyThe word "tianshu", Hou Jie also worked very hard on it. The reason is that in the early days, we had a hard time learning COM/Ole because we didn't have enough knowledge about the object model.I have read a lot of books and have some experience using C ++/OO in actual development work. I will learn more.Xi

. Only a proxy DLL is called, while the COM component program uses the stub DLL. Then the agent DLL and the stub DLL are used to implement inter-process communication. The process is shown in: 2. Management of COM objects The COM component must be used by other customer programs. To use these COM components, you mu

system together with some related information to uniquely identify the component. The client application dynamically creates an instance of a component only during running and uses the function of the component. Therefore, only one function library is required to be copied. Its disadvantage is that we often mention it? Quot; DLL hell ". This problem occurs when a DLL is replaced by a new version of DLL. The developer has to clear reference to this component by disabling all client applications

system together with some related information to uniquely identify the component. The client application dynamically creates an instance of a component only during running and uses the function of the component. Therefore, only one function library is required to be copied. Its disadvantage is that we often mention it? Quot; DLL hell ". This problem occurs when a DLL is replaced by a new version of DLL. The developer has to clear reference to this component by disabling all client applications

above, in fact, it also reflects a load balancing.(1) Real asynchronous communication. The underlying layer of COM + provides Queue component services, which makes it possible for customers and components to work collaboratively at different time points. COM + applications can achieve this feature without adding code.(2) Event Service. The new event mechanism ma

result. Internal com to database interface Textual Direct In SQLite com the data is automatically or explicitly converted to text before sending/sorting it to/from the Database Engine (Internally ).In sqlite3 com the data is converted from/to the closest internal database value type which makes th

information is placed in the registry of the system to uniquely identify the component. Client applications only dynamically build an instance of a component during run time and use the functionality of the component, so only a copy of the library is required. Its disadvantage is that we often refer to quot;dll hell. " This problem is raised when a DLL is to be replaced by a new version of the DLL. Developers have to eliminate the use of a reference to this component by shutting down all client

like:Class Faststring{public: faststring (const char* str); Faststring (void); int Find (const char* str);p rivate: char* m_str;};Do not underestimate this class, it is fast to find the string (I do not know why it is so fucking fast). After listening to the needs of the manufacturers, the clever writer quickly thought of a good solution, through a variable len to save the length of the string, through a function length return variable len, time complexity but O (0) Oh, so

registry of the system together with some related information to uniquely identify the component. The client application dynamically creates an instance of a component only during running and uses the function of the component. Therefore, only one function library is required to be copied. Its disadvantage is that we often mention it? Quot; DLL hell ". This problem occurs when a DLL is replaced by a new version of DLL. The developer has to clear reference to this component by disabling all clie

1, the implementation of COM and operating system platform is closely related Because COM originated in the Microsoft Windows platform, the COM implementation part (that is, the COM library) uses some of the features of the Windows system directly, such as the system registry, the dynamic Connection library, and so on