By Ted Pattison
On the way to create scalable, dispensed items with visible simple, a programmer needs to comprehend the underlying structure and complexities of Microsoft's part item version (COM)-information that formerly has been basically to be had in assets aimed toward the C++ programmer. PROGRAMMING dispensed purposes WITH COM AND MICROSOFT visible simple 6.0 teaches COM basics in language visible easy programmers comprehend, and explains find out how to make the most the numerous COM-based services in visible easy 6.0. companies which could leverage latest VB talent to advance enterprise items within the heart tier can observe great earnings of their firm improvement approach.
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Extra info for Programming Distributed Applications With Com & Microsoft Visual Basic 6.0
Each COM server is responsible for adding its configuration information to the registry when asked. Chapter 5 describes the use of the registry in COM in greater depth, but for now just assume that the SCM can always locate the server on the hard disk. What happens in an activation request? Here's the play-by-play. When a Visual Basic application calls the New operator on a coclass that is defined in a COM DLL, the following happens: 1. The Visual Basic run-time library calls CoCreateInstance and passes the SCM the requested CLSID and the IID.
30 Separating the Interface from the Implementation Fortunately, the Visual Basic IDE makes it easy to create the procedure stubs for the method implementations if you use the keyword Implements at the top of the class module. The class module's editor window has a wizard bar that includes two drop-down combo boxes. If you select the name of the interface in the left combo box, you can quickly generate the skeletons for the method implementations by selecting the method names in the right combo box.
OLE allowed Microsoft to promote a document-centric approach to computing rather than the application-centric approach that was most common in business software. OLE requires interprocess communication among applications. The original version of OLE was based on an interprocess mechanism called Dynamic Data Exchange (DDE). This initial release was plagued with resource and performance problems, which resulted in limited acceptance within the industry. Microsoft knew that OLE's features were valuable conceptually but also that making this technology usable in a production environment would mean optimizing the underlying infrastructure.
Programming Distributed Applications With Com & Microsoft Visual Basic 6.0 by Ted Pattison