By Mandelbrot Set International Ltd
Within the authors' phrases, "Our major goal in penning this e-book is to write down the main complex booklet but on hand" on Microsoft visible easy. Written from the viewpoint of the pro visible easy developer, complicated MICROSOFT visible easy, second variation explores the entire probabilities open to a developer utilizing visible uncomplicated as his or her fundamental client/server improvement software. New to this version is fabric on new info entry applied sciences, accessibility concerns for the bodily challenged, elevated aid for IIS, BackOffice(r) and combined language programming, and company aid for server facet gadgets, equivalent to the part gallery and Microsoft Transaction Server. The accompanying CD-ROM includes pattern code and invaluable utilities constructed and confirmed through the authors, The Mandelbrot Set.
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Additional info for Advanced Microsoft Visual Basics 6.0
The standard Visual Basic Data control has an error event, for instance. Logging errors and tracing procedure stacks in components raises some special problems. It clearly makes sense to log errors, which are sent back to a client from a component. Thus, if you're creating an OCX, you would raise an error and expect that the client code would log that error in its error log. Components on remote machines may also have specific requirements about where to log. For components there are a number of possible error log locations: ♦ Files (either flat files or Structured OLE storages) ♦ NT Event Log (but beware of using this with components deployed in Microsoft Transaction Server) ♦ Databases (but always have some other means to fall back on if your database connections fail) It makes sense to add other information to a component's error log, because it's useful to know the UserID or Logon name, the machine name, the process ID, and the thread ID.
Imagine what code fails to execute all because someone forgot to test against SUCCESS. Because any nonzero value is evaluated as True (in an If), using a value other than 0 (say, a negative value) to indicate failure can be equally dangerous. Given that in any conditional expression you don't have to test against an explicit value and that nonzero means execute the compound statement, the language conspires against you here not to use 0 as a code indicating success. I'd advise sticking to True meaning success and False meaning failure.
This chapter concentrates on the middle business object layer and introduces the concepts of action objects, factory objects, and worker objects. Data Access Layer The most common question I get asked by Visual Basic developers is, "What type of DAL should I use? " The answer is never easy. ) What I do think is a good approach to data access is to create a simple abstract data interface for your applications. This way, you can change your data access method without affecting the other components in your application.
Advanced Microsoft Visual Basics 6.0 by Mandelbrot Set International Ltd