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Building Blocks
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In order to make extensions to a system, you have to start within that system This book offers a number of new programming techniques that you can use in your VB projects, but it is an extension of your existing VB knowledge not a replacement for it Just as an addition to a house shares a foundation and walls with the existing structure, these techniques are built on the foundation that VB already has in place To extend the metaphor, I have also tried to make our new room blend seamlessly with the existing structure
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This chapter is meant only as an introduction to those parts of VB that are used to build all the other extensions in this book You will feel more at home with the rest of the chapters if you know where I started The fundamental concept behind all of the extensions is that VB is a COM-based language VB data types are COM data types, and the COM data types are well documented and easily declared The techniques used in this book will work as long as VB remains a COM-based product If VB ever moves away from the COM binary standard, the techniques you see here will have to change as well Because VB and COM are tied together so tightly, the one guarantee that I can make is that you will rewrite a lot more code than just the pieces you pull from this book if you want to make your program run in a future version of VB that is not based on the COM standard
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BUILDING BLOCKS
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Pointers are probably the last things that come to mind when you think about VB programming In fact, you may be programming in VB in order to avoid the complexities of pointer manipulation inherent in C+ + VB doesn't even allow you to define a variable with a pointer type A pointer is a memory address, so VB has no built-in mechanism to manipulate memory via its address However, VB does allow you to declare variables with object, array, and string types as well as allow you to pass any variable by reference Every one of these operations involves pointer manipulation The only difference between VB and C+ + with regard to these common operations is that VB completely hides the pointers from you Let's start by looking at the simple case of passing a Long value to two functions, one that expects a ByVal parameter and another that uses ByRef semantics The equivalent C + + code for both cases will reveal the work VB is doing for you in this very common case (ByRef is the default for all VB parameter types) Both pieces of code are doing the same pointer manipulation, but VB does all of the pointer work for you in both the calling code and the function implementation All you have to do is specify the ByRef-ness at the parameter 'Pass a parameter by value and then by reference Sub ByValProc(ByVal Paraml As Long) Paraml = 20 End Sub Sub ByRefProc(ByRef Paraml As Long) Paraml = 20 End Sub Sub Main () Dim lvalue As Long lvalue = 1 0
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ByValProc lvalue 'lvalue is still 10 ByRefProc lvalue 'lvalue is now 20 End Sub
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ADVANCED VISUAL BASIC 6
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// Equivalent C/C++ code void ByValProc(long Paraml) { Paraml = 2 0; } void ByRefProc(long* pParaml) { *pParaml = 2 0; } void Main() { long lvalue = 10; ByValProc(lvalue); ByRefProc(&lValue); } In addition to ByRef parameters, some of VB's intrinsic types are also pointer based Types fall into two categories: In-line types and pointer types In-line types include Byte, Integer, Long, Single, Double, Boolean, Currency, Variant, user-defined types (UDTs), fixed-size arrays in UDTs, and fixed-length strings These types store their data at the position they are defined and have variable sizes For example, a Byte occupies 1 byte of memory, and a Variant takes 16 bytes Pointer types (which include all object types, variable and fixed-size arrays, and strings) are all variable-length structures that store their data in a different memory location A 32-bit pointer to this memory (equivalent to four bytes, or one Long variable) is then stored where the variable is defined Although Variants and UDTs are in-line types, they can contain pointer types, so they occupy memory both where they are defined and in a secondary location The difference between in-line types and pointer types is made clearer by defining both a UDT (also called a structure or record in this book) and a class module with the same members, then trying to look at their byte lengths with the LenB function 'Type definition in a standard (bas) module Public Type TwoLongs Longl As Long Long2 As Long End Type
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