You are here

New PDF release: Advanced Visual Basic 6: power techniques for everyday

By Matthew Curland

In complex visible simple 6, top visible easy professional Matthew Curland demonstrates powerhouse thoughts programmers can use to put in writing high-performance, powerful, and reusable VB code. Readers how one can leverage the shut relationships among VB, COM, and OLE Automation, extending the envelope of VB's services and development top of the range, object-based structures. Key themes comprise how to:* keep watch over VB array variables explicitly to at once entry arbitrary reminiscence destinations* name tips that could typical, cdecl, and sophistication module services* combination entire interface implementations into any VB item* Override capabilities on any interface, together with these carried out immediately via VB* flip any user-defined kind right into a light-weight COM item* reduce reminiscence utilization in structures with numerous items* effectively create and deal with threads in ActiveX EXEs and DLLs* engage with messages to customise windowed and windowless UserControl objects.The site accompanying this publication comprises wide resource code samples to permit all recommendations with no exterior DLLs. It additionally presents built-in sort library add-ins for developing and enhancing referenced libraries, editing binary compatibility documents, and customizing the sort libraries that VB generated for ActiveX parts. With this compendium of top practices, subtle strategies, and priceless utilities, VB programmers will achieve a deeper knowing of VB's internal workings and be capable to expand its object-oriented functions.

Show description

Read or Download Advanced Visual Basic 6: power techniques for everyday programs PDF

Best visual basic books

Visual Basic .NET Core Language Little Black Book - download pdf or read online

Visible uncomplicated . web center Language Little Black publication is an critical quickly reference consultant to visible easy . internet syntax and knowledge association. Readers get a guided travel with knowledgeable programmer who concisely explains the right way to use the visible simple instruments, from the built-in improvement atmosphere to the debugger.

Download e-book for kindle: Microsoft Visual Basic 2005 Express Edition: Build a Program by Patrice Pelland

The "Build a application Now" sequence, for VB, C# and so on might be downloaded at no cost, if you sign in the replica of your language, that you can additionally obtain loose on the microsoft internet site.

Why to spend cash for this publication should you can obtain it for free?

Robert Smith, Visit Amazon's Dave Sussman Page, search's Beginning Access 2002 VBA PDF

What's this booklet approximately? entry 2002 is the center database software in the workplace XP suite. utilizing VBA (Visual uncomplicated for Applications), the consumer can create his or her personal courses in what's basically a subset of the visible uncomplicated programming language. utilizing VBA with entry is a drastically robust process, because it lets you create nice consumer interfaces (like types or stories) as a entrance finish to genuine info garage and manipulation in the database itself.

Developing Secure Applications with Visual Basic - download pdf or read online

Constructing safe purposes with visible uncomplicated first will give you an figuring out of encryption, after which publications you thru including safety features in your personal purposes utilizing the Microsoft CryptoAPI, and the recent security measures of home windows 2000. builders who've been burdened by means of the high-end, educational form of different encryption books and cryptography concept will pride with Chapmans comprehensible kind and hands-on equipment.

Extra resources for Advanced Visual Basic 6: power techniques for everyday programs

Example text

There are three advantages to using fixed-size arrays. LEVERAGING ARRAYS 27 When the array is a local variable, the array descriptor is allocated on the stack. Stack allocation generally performs better than heap allocation, giving fixed-size arrays the advantage here. Only arrays that are dimensioned with the Dim keyword and that specify bounds in the declaration are fixed-size. It is a common mistake to use the ReDim keyword as the primary declaration for the array variable. 'Snippet 1, compile error Dim lArr(0, 0) As Long lArr(0) = 10 'Wrong number of dimensions 'Snippet 2, no compile error, not a fixed-size array ReDim lArr(0, 0) As Long lArr(0) = 1 0 'Runtime error 9 The shape of a fixed-size array cannot be changed when the array is passed to an external function.

Once the memory for a given index has been located in the array, the resulting pointer is then treated as a non-array variable of the same type as the array. You may think that this definition of an array leaves out multi-dimensional arrays and arrays with a nonzero base index. However, these two cases are simply extensions of the one-dimensional, zero-based indexing system. With a nonzero based array (Dim MyArray(5 To 8) As Long), the lower bound is simply subtracted LEVERAGING ARRAYS 11 Element Number Byte Offset Decimal Value Memory Figure 2 .

The AddRef and Release functions take no parameters and return the current reference count on the object. Although the return value is generally the internal reference count, you cannot rely on this number to reflect the inner reference count for all object implementations. If Release returns 0, you know that the object has been destroyed. If it returns anything else, the object is still alive. QueryInterface (QI for short) is used to ask a COM object for references to specific interfaces. This involves passing an interface identifier (IID), which is what a Globally Unique IDentifier (GUID) is called when it's used to identify an interface.

Download PDF sample

Rated 4.95 of 5 – based on 24 votes
Top