iv
keep each example driver as simple as possible so that the critical features are nearly
self-evident. Most of the example code is written in C and embedded assembly using
VC++ 4.0. Where necessary, code is written in assembly using Microsoft Assembly
(MASM) v6.1. The code disk includes a library of wrapper functions that allow VxDs
to be coded almost entirely in C.
Which Version of Windows?
This book covers both Windows 95 and Windows 3.x (Enhanced Mode). The focus is
on Windows 95, but almost all of the material also applies to Windows 3.x. In most
chapters the differences between the two versions are minimal and Windows 3.x con-
siderations are simply highlighted in a separate section at the end of the chapter. In a
few chapters the differences are larger. In these chapters I fully describe both ver-
sions, each in a separate section.
About the Book
This book is partitioned into two major sections. Part I (Chapters 2 through 12) covers
the Windows execution environment and VxDs. Part II (Chapters 13 through 19) cov-
ers DLL-based drivers. Within each part, the chapters are ordered so that each builds
on the prior chapters. Once you have read Chapter 1 and decided whether you need to
build a VxD or a DLL, you can decide how to read the rest of the book. Nearly every-
one should read Chapters 2 and 3. These chapters describe those portions of the Win-
dows architecture that are important to device driver writers. The topics covered in
these chapters are important to both VxD and DLL developers. Those readers who are
rusty on selectors, descriptors, page tables, and the other architectural details of the
80x86 family of processors will want to read and refer to Appendix A as they read
Chapters 2 and 3. Throughout the book, I assume you are comfortably familiar with
the architectural information in Appendix A. Finally, if it bothers you to have certain
implementation details hidden, you may want to read portions of Appendix B as you
study the first example drivers. This appendix is the primary reference for the assem-
bly language “wrappers” used throughout the text.
Companion Files on the FTP Site
NOTE: The full source code, wrapper library, and so forth for this book are now avail-
able on the publisher’s ftp site at ftp://ftp.cmpbooks.com/pub/hazzah.zip; logon
as “anonymous” and download the file. Any references to the “companion code disk”
in the book now refer to the files available on the ftp site.
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yiwang74362012-12-14理解Driver的设计思想还是不错的。
