TYPE LIBRARIES AND VB in Java

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If you want to change the default interface of a class, you need to edit the typelib The VBoost objects enable you to redirect a QueryInterface request for the IDispatch object to a secondary interface, but this doesn't help you if you never receive a QI for IID_lDispatch By modifying the typelib and redirecting the QI call, you can keep the object implementation and the typelib description of your object in sync This enables you to put a standard default interface on multiple objects and also to build VB objects with methods such as Open, Close, Input, Output, Stop, and so on In general, you can't use these names because VB won't let you use a method or property name that conflicts with a keyword
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You can help the marshaler by changing [in,out] parameter settings to either [in] or [out] Changing [in,out] to [in] on an array or structure type can save an entire array copy when the function call returns Changing an array parameter's attribute to [out] guarantees that you always have an empty array to work with when it is called from an external source
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The typelib tools provided with the book are meant to enhance but not replace VB's automatic typelib generation Most of the time, VB does what you want These tools just provide a few enhancements you need to ease your development process and produce a highly professional finished product
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ADVANCED VISUAL BASIC 6
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Although VB6 uses COM objects extensively, it is generally viewed as primarily a Window's development tool Your first VB project was most likely a Standard EXE that had a form or two, not an ActiveX DLL When you participate in the Windows environment, you devote a lot of development time to creating and interacting with forms, controls, and other VB elements that have a graphical representation After all, the best back-end engine in the world is worthless if you can't display the results to a user This chapter focuses on applying technologies from this book to the specific problems of subclassing and window creation Subclassing allows you to interact with the stream of messages sent from the operating system to a window object Window creation allows you to create custom windows from scratch rather than adopt them after VB has created them for you
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A window is like a COM object in many ways Window objects use memory, encapsulate an implementation behind a set of publicly defined functions, and have
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a specific type, a unique identity, and a well-defined lifetime But a window differs from a COM object in that it has a single owner, is manipulated through API functions rather than methods, and it receives all event notifications through a single function Just as external calls to a COM object use a pointer to the object, calls to window objects use a window handle, or HWND (Handle to WiNDow) You can think of an HWND as a weak reference to a window object Storing an HWND does not imply that you own the window object in the same sense that holding a strong reference on a COM object guarantees that the object remains alive Windows itself owns every window object and ultimately controls the lifetime of them all External manipulation of a window object takes place through the subset of the Windows API that takes an HWND as the first parameter or that returns an HWND value The collection of API functions provided for manipulating an HWND is loosely coupled and randomly ordered: a stark contrast with the tightly defined world of COM vtables, interfaces, and methods All HWND functions are declared in the User32 part of the Win32 API The other two core groups of functions are Kernel32, which handles the core OS operations such as process and thread creation, and GDI32, which contains drawing functions A User32-controlled window lives within a process created by Kernel32, and it is drawn using GDI32 You will see a number of API calls in this chapter Although I briefly discuss the; API functions that are directly applicable to the core concepts presented here I'm leaving you on your own to research the other calls There are a number of good API books that address several different skill levels I also recommend keeping your MSDN CDs up to date to get the most complete API information I have not tried to create a comprehensive set of TypeLib-declared API calls because this book is not a comprehensive (or even partial) overview of using the Win32 API with VB The projects referenced in this chapter rely on Declare statements to access the Window's API, but you could also use a type library if you like I'd recommend using the API typelib from Bruce McKinney's Hardcore Visual Basic (Microsoft Press) Bruce has chosen not to complete a third edition of his book and is no longer updating this typelib You need not fret, however, because some very able hands still maintain the typelib You can find an up-to-date version of the typelib, complete with source, at http;//www TheMandelbrotSetcom
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