Sams Teach Yourself DirectX 7 in 24 Hours - download pdf or read online

By Robert Dunlop

ISBN-10: 0672316331

ISBN-13: 9780672316333

From the 1st hour, Sams educate your self DirectX 7 in 24 Hours has you developing your individual DirectX-enabled functions. writer Robert Dunlop publications you thru the advanced DirectX APIs, empowering you to create your personal DirectX powered purposes that includes gentle 3D portraits and sound. as well as laying the COM-based DirectX beginning, Robert covers animation, DirectSound, DirectMusic, Direct3D, keep an eye on units, strength suggestions controls, and multi-user video games. This booklet is a perfect start line to hone your DirectX talents quick and simply.

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In essence, this allows for multiple owners of the same object. This is achieved through a technique known as reference counting. When an interface is initially created, it contains an internal count, called the reference counter, which is initialized to 1. This represents the number of pointers that reference the interface. Each time a pointer to the object interface is provided through QueryInterface(), or through a DirectX function that returns an interface pointer, the reference count is increased by one.

PUnkOuter Reserved for future use. Must be NULL. Be sure to clear all unused values in the DDSURFACEDESC2 structure and to initialize the dwSize member of this structure to sizeof(DDSURFACEDESC2). Failure to do so results in application errors and possible corruption of memory. 21 2 05 1634xCH02 11/13/99 10:48 AM Page 22 22 Hour 2 Surfaces in Differing Roles DirectDraw surfaces appear in a great many roles. Ways in which surfaces will be used include the following: ● Offscreen surfaces are used to store images for later use.

The reference count is then tested, and if it has reached 0, the object is destroyed. 03 1634xCH01 11/13/99 11:04 AM Page 13 About DirectX—The Pieces That Make It Happen The reference count can also be increased using the AddRef() function, defined in the IUnknown base class. This is useful if your program is going to maintain multiple copies of a pointer; for example, if a worker thread will maintain its own pointer to an interface. Be sure that every reference to an object has one (and only one) call to Release(), whether returned from a DirectX function, through QueryInterface(), or incremented by AddRef().

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Sams Teach Yourself DirectX 7 in 24 Hours by Robert Dunlop

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