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There are several additional typelibs that carry the VBoost name to make them easy to find in the Project/References dialog These typelibs also use types from the main type library to eliminate redefinition of common types These files include VBoost: Object Creation and Security (ObjCreateOlb), VBoost: Ole Type Definitions (OleTypesOlb), VBoost: Type Library Types and Interfaces (TlbTypesOlb), VBoost: API declares used for threading (ThreadAPlOlb), and VBoost: ROT Hook Types (ROTHookTypesOlb) VBoost itself does not require references to the additional libraries You'll need to initialize a VBoost variable before running the samples in this book This is easily done with the following steps: Use the Project/References dialog to add a reference to VBoost Object Types (60) and VBoost Object Implementation (60) Add the VBoostBas file from your local copy of the PowerVB\Code directory on the book's CD Call InitVBoost somewhere early in your code It is easiest to do this from Sub Main, but there is minimal penalty for calling InitVBoost more than once just to be sure You are now ready to pull any of the files from the PowerVB\Code directory and write your own code against the VBoost extensions
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Arrays are an indispensable tool for any serious programmer Arrays allow programs to make the quantum leap from acting on a single item to performing the same action against an arbitrary number of items Arrays also allow you to impose an order on multiple items As a reader of this book, you should be familiar with arrays, but you may not know how VB handles arrays internally This chapter is placed very early in the book because understanding how VB uses arrays is required for many other techniques discussed in later chapters
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At its lowest level, an array is simply a block of contiguous memory This block of memory is divided into a number of equally sized elements An element in an array is accessed via a zero-based index for the element by adding <lndex> * <Element Size> to the starting address of the memory block 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
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The memory layout of a seven-element array of Longs
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from the index to form a zero-based index, which is then used to locate the element In a multi-dimensional array (the number of dimensions is also called the rank of the array), the vector of indices is used to calculate a zero-based index, which is then plugged into the <ArrayBase> + <lndex> * <Element Size> formula Programming languages support nonzero based and multi-dimensional arrays so that you don't always have to calculate a zero-based index yourself Since these more complex array types are just thinly veiled versions of a singledimensional array, I'll concentrate on zero-based, one-dimensional arrays
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Although the fundamental building block of any array is the memory block that contains the array's data, a VB array variable is not a pointer to the array's data block Instead, the array variable points to a structure that describes the contents of the array This structure is known as an array descriptor, and it has the type SAFEARRAY in the C + + headers (the standard OLE Automation structure used to describe an array) SAFEARRAY is called SafeArray in VBoostTypes6Tlb (SAFEARRAY is a keyword in IDL/ODL, so you can't use it as a type name) By describing its arrays with a SafeArray structure, VB can leverage a wide variety of array-manipulation routines provided by OleAut32DII and interoperate easily with external components For example, VB's ReDim statement maps to the SafeArrayCreate[Ex] API, ReDim Preserve maps to SafeArrayRedim, and Erase maps to SafeArrayDestroy The SafeArray descriptor plays the central role in array manipulation The descriptor holds information about the bounds of the array, the type of data contained in the array, and how the memory for the array was originally allocated This information not only allows all VB arrays to be managed with the SafeArray* API functions, it also allows arrays to be marshaled correctly when
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