Debugging Microsoft Windows Applications

Overview


Amid a booming market for third-party software debugging tools -- evidence that bugs and defects are a pernicious fact of everyday programming life -- there exists no single guidebook that adequately addresses the topic of debugging as a programming discipline. But with the upcoming publication of ""Debugging Microsoft Windows Applications,"" developers finally get the practical, Windows-focused reference they need for finding and correcting costly coding errors. The book takes a holistic approach to debugging ...
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Overview


Amid a booming market for third-party software debugging tools -- evidence that bugs and defects are a pernicious fact of everyday programming life -- there exists no single guidebook that adequately addresses the topic of debugging as a programming discipline. But with the upcoming publication of ""Debugging Microsoft Windows Applications,"" developers finally get the practical, Windows-focused reference they need for finding and correcting costly coding errors. The book takes a holistic approach to debugging -- redefining ""bugs"" not just in terms of crashes and high-profile calamities, but including everything from user interface problems and performance issues to incomprehensible product manuals.

The first section introduces the ""Zen of Debugging, "" outlining what developers need to know both before and during product development Section two demonstrates how to maximize the vastly under-utilized built-in debugging capabilities in the Visual Studio ""RM"" product family. The last section of the book steps readers through specific debugging situations and their solutions, covering such topics as multithreaded debugging, crash handlers, and automated regression testing. Throughout, the book focuses on practical, tested techniques -- ready for work -- in the tradition of the award-winning Microsoft Press ""RM"" Best Practices series.

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Editorial Reviews

From Barnes & Noble
The Barnes & Noble Review
Debugging: it's the aspect of development most likely to keep you up all night, screaming at your computer—and your colleagues. What's worse, when you think about your development cycle, it's not unusual for debugging and related activities to eat up half your time. If you develop for Windows, there's a new alternative to more coffee and Jolt Cola: Debugging Applications, by John Robbins.

Robbins writes the Bugslayer column for Microsoft Systems Journal, and you won't find a more dedicated, committed expert on the subject. As he puts it, his new book takes a holistic approach to debugging. "I don't consider debugging as a separate step but as an integral part of the entire product cycle... you need to start debugging in the requirements phase and continue through to the final release to manufacturing." That's what this book shows you how to do.

Robbins starts by presenting "the gestalt of debugging"—defining the different types of bugs that exist, and presenting an approach and process to debugging that many great developers have evolved on their own. Robbins also offers specific, Windows-focused techniques for proactively debugging as you write your code—and for keeping you out of your debugger by helping you write cleaner, less buggy code up-front.

Next, he introduces "power debugging" techniques that make the most of your debugger—whichever one you're using, in Visual C++ or Visual Basic. Most developers don't use a fraction of the power of their debuggers—after youreadRobbins, you won't be one of them.

In Part III—fully half of the book—Robbins presents solutions to the debugging problems you're most likely to encounter in Windows applications—from tracking down deadlocks in multithreaded programs to automatically testing user interfaces, debugging Windows 2000 services and DLLs that load into services, and more. Throughout the book, you'll also find great sidebars and war stories—many from his experience at NuMega, one of the world's leading providers of debugging tools. Once you read this book, you'll never look at debugging the same way again—and you certainly won't spend as much time doing it!

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Product Details

  • ISBN-13: 9780735608863
  • Publisher: Microsoft Press
  • Publication date: 2/26/2000
  • Series: DV-MPS Programming Series
  • Edition description: BK&CD ROM
  • Pages: 250
  • Product dimensions: 7.35 (w) x 9.23 (h) x 1.37 (d)

Meet the Author

Robbins is considered to be one of the world's leading experts on the dietary link to the environment and health. He is the founder of EarthSave International.

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Read an Excerpt


Chapter 2. Getting Started Debugging

In this chapter, I'll introduce some important infrastructure tools and requirements that will contribute to your debugging success over the lifetime of your application. Some of the tools involve the engineering process, and others are software utilities. What they all have in common is that they allow you to see the progress of your project on a daily basis. I believe this daily monitoring is the key to getting your product out the door on time-with quality. Projects don't slip massively in one day; they slip a little each day along the way.

All the ideas presented here and in Chapter 3 come from my experience shipping real-world software products, and I can't imagine developing without these tools and techniques. I've learned some lessons the hard way, and I hope to save you time and pain by sharing with you what these lessons have taught me. You might think that some of these ideas don't apply to you because you're on a two-person or threeperson team. Don't worry, they do. Even when I'm on a team of one, I still approach a project in the same way. I've worked on projects of every size you can think of, so I know the recommendations I make scale from the tiniest to the largest teams.

Track Changes Until You Throw Away The Project

Version control and bug tracking systems are two of the most important infrastructure tools you have because they give you the history of your project. Although the developers might say they can keep everything in their heads, the company needs to have some record of what's been accomplished on the project in case the entire development team wins the lottery and everyone quits the next day. Because most teams don't adequately maintain their requirements and design documents throughout the life of a project, the only real documentation becomes the audit trail in the version control and bug tracking systems.

I hope I'm preaching to the converted. Unfortunately, I keep running into teams that haven't yet started using these tools. As someone interested in history, I feel you have to know where you've been to know where you're going. Putting these two tools to use is the only sure way to learn that lesson. By monitoring the outstanding bugs and bug fix rates in the bug tracking system, you can better predict when your product will be ready to ship. With the version control system, you'll get an idea of your "code churn," the volume of changes, so that you can see how much additional testing needs to be done. Additionally, these tools are the only effective way to judge whether you're getting any results from changes you implement in your development cycle.

When you bring a new developer to your team, these tools can pay for themselves in a single day. When the new developer starts, have her sit down with the version control and bug tracking software and begin working her way through the changes. Good design documents are ideal, but if they aren't available, the version control and bug tracking systems at least provide a record of the code evolution and highlight any trouble areas.

I'm talking about these two tools in the same breath because they are inseparable. The bug tracking system captures all the events that might have driven changes to your master sources. The version control system captures every change. Ideally, you want to maintain the relationship between reported problems and actual changes in the master sources. By correlating the relationship, you can see your cause and effect for bug fixes. If you don't track the relationship, you're left wondering why certain changes to the code occurred. Invariably, in later versions of the product, you have to find the developer who made the change and hope he or she remembers the reason for the change.

Some products are integrated and automatically track the relationship of the master source change to the bug report, but if your current systems don't, you'll need to maintain the relationship manually. You can track the relationship by including the bug number in the comments that describe the fix. When you check the file back into version control, you'll need to identify the bug number you're fixing in the checkin comment for the file.

Version Control Systems

The version control system isn't just for your project's master sources. Anything and everything related to the project-including all test plans, automated tests, the help system, and design documents-needs to go into the version control system. Some companies even include the build tools (that is, the compiler, linker, include files, and libraries), which allows them to completely re-create the shipped version of their product. If you have any question about whether something should go in version control, ask yourself whether maintenance programmers could use the information in a couple of years. If you think they could, that information belongs in the version control system.

Controlling Changes

Tracking change is vital; however, having a good bug tracking system in place doesn't mean that developers should be allowed to make wholesale changes to the master sources whenever they want. Such carte blanche would make all the tracking pointless. The idea is to control the changes during development, restricting certain types of changes to certain stages of the project so that you can have an idea of the state of the master sources on a day-to-day basis. The best scheme I've heard of for controlling changes comes from my friend Steve Munyan, and he calls it "Green, Yellow, and Red Times." In Green Time, anyone can check in anything to the master sources. The earliest parts of the project are usually fully in Green Time because at this point the team is working on new features.

Yellow Time is when the product is in a bug fix phase or nearing a code freeze. The only code changes allowed are for bug fixes-and only bug fixes. No near features or other changes are permitted. Before a developer can check in a bug fix, a technical lead or a development manager must approve it. The developer making the bug fix must describe the bug fix he's making and what it affects. In essence, this process is a mini code review for every single bug fix. On some teams I've been on, the product was in Yellow Time from day one because the team liked the code review aspects of this stage. We did loosen the approval requirements so that any other developer could approve changes. The interesting outcome was that because of the constant code reviews the developers caught many bugs before they checked the code into the master sources.

Red Time occurs when you're in a code freeze or near a key milestone and all code changes require the product manager's approval. When I was a product manager, I even went to the extent of changing the permissions in the version control system so that the team had read-only access. I took this step mainly because I understood what the developers were thinking. "This is just a little change; it will fix this bug, and it won't hurt anything else." The developers' intentions were good, but that one little change could mean that the entire team would have to restart the test plan from the beginning.

The product manager must strictly enforce Red Time. If the product has a reproducible crash or data corruption, the decision to make the change is essentially...

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Table of Contents

List of Sidebars xv
Foreword xvii
Acknowledgments xxi
Introduction xxiii
Part I The Gestalt of Debugging
Chapter 1 Bugs: Where They Come From and How You Solve Them 3
Bugs and Debugging 3
What Are Bugs? 4
Process Bugs and Solutions 6
Planning for Debugging 11
Prerequisites to Debugging 12
The Skill Set 12
Learning the Skill Set 14
The Debugging Process 15
Step 1 Duplicate the Bug 16
Step 2 Describe the Bug 17
Step 3 Always Assume That the Bug Is Yours 17
Step 4 Divide and Conquer 17
Step 5 Think Creatively 18
Step 6 Leverage Tools 18
Step 7 Start Heavy Debugging 19
Step 8 Verify That the Bug Is Fixed 19
Step 9 Learn and Share 21
Final Debugging Process Secret 21
Summary 21
Chapter 2 Getting Started Debugging 23
Track Changes Until You Throw Away
The Project 23
Version Control Systems 24
Bug Tracking Systems 27
Choosing the Right Systems for You 28
Schedule Time for Building Debugging Systems 29
Build All Builds with Debugging Symbols 30
Treat Warnings as Errors--Maybe 31
Know Where Your DLLs Load 33
Design a Lightweight Diagnostic System for Release Builds 40
Frequent Builds and Smoke Tests Are Mandatory 42
Frequent Builds 42
Smoke Tests 43
Build the Installation Program Immediately 45
QA Must Test with Debug Builds 45
Summary 46
Chapter 3 Debugging During Coding 47
Part II Power Debugging
Chapter 4 How Do Debuggers Work? 85
Types of Windows Debuggers 86
User-Mode Debuggers 86
Kernel-Mode Debuggers 87
Windows 2000 Operating System Support for Debuggees 92
Windows 2000 Heap Checking 92
Automatically Starting in a Debugger 95
Quick Break Keys 95
MinDBG: A Simple Win32 Debugger 96
WDBG: A Real Debugger 110
Reading and Writing Memory 112
Breakpoints and Single Stepping 114
Symbol Tables, Symbol Engines, and Stack Walking 124
Step Into, Step Over, and Step Out 139
An Interesting Development Problem with WDBG 140
So You Want to Write Your Own Debugger 143
What's Next for WDBG? 144
Summary 145
Chapter 5 Power Debugging with the Visual C++ Debugger 147
Advanced Breakpoints and How to Use Them 148
Advanced Breakpoint Syntax and Location Breakpoints 149
Quickly Breaking on Any Function 150
Breakpoints on System or Exported Functions 151
Location Breakpoint Modifiers 153
Global Expression and Conditional Breakpoints 156
Windows Message Breakpoints 158
Remote Debugging 160
Tips and Tricks 163
Setting Breakpoints 164
The Watch Window 164
The Set Next Statement Command 170
Debugging Visual Basic Compiled Code 171
Summary 172
Chapter 6 Power Debugging with x86 Assembly Language and the Visual C++ Debugger Disassembly Window 175
The Basics of the CPU 176
Registers 177
Instruction Format and Memory Addressing 179
A Word About the Visual C++ Inline Assembler 181
Instructions You Need to Know 182
Stack Manipulation 182
Very Common Simple Instructions 184
Common Sequence: Function Entry and Exit 184
Variable Access: Global Variables, Parameters, and Local Variables 186
Calling Procedures and Returning 190
Calling Conventions 191
Calling Conventions Example 193
More Instructions You Need to Know 197
Data Manipulation 197
Pointer Manipulation 199
Comparing and Testing 200
Jump and Branch Instructions 200
Looping 203
String Manipulation 204
Common Assembly-Language Constructs 207
FS Register Access 207
Structure and Class References 209
A Complete Example 210
The Disassembly Window 214
Navigating 214
Viewing Parameters on the Stack 215
The Set Next Statement Command 217
The Memory Window and the Disassembly Window 218
Tips and Tricks 222
Endians 222
Garbage Code 223
Registers and the Watch Window 223
Learn from ASM Files 223
Summary 224
Chapter 7 Power Debugging with the Visual Basic Debugger 225
Visual Basic P-Code 226
A P-Code History Lesson 226
Ramifications of Using P-Code 227
Error Trapping: Break In or Break On Options 229
Break On All Errors 230
Break On Unhandled Errors 230
Break In Class Module 231
A Final Plea for Decent Error Trapping 231
Visual Basic Debugger Windows 231
The Locals Window 232
The Immediate Window 232
The Watch Window 233
Tips and Tricks 235
Add the Run To Cursor Button to the Debug Toolbar 235
Avoid Compile On Demand 235
Group Projects Are the Way to Go for Debugging 235
Visual Basic Debugging and Reality Might Conflict 236
Summary 236
Part III Power Tools and Techniques
Chapter 8 Finding Source and Line Information with Just a Crash Address 239
Creating and Reading a MAP File 240
MAP File Contents 241
Finding the Function, Source File, and Line Number 244
Using CrashFinder 245
Implementation Highlights 248
What's Next for CrashFinder? 254
Summary 254
Chapter 9 Crash Handlers 255
Structured Exception Handling vs. C++ Exception Handling 256
Structured Exception Handling 256
C++ Exception Handling 259
Combining SEH and C++ Exception Handling 260
The SetUnhandledExceptionFilter API Function 264
Using the CrashHandler API 265
Translating Exception_Pointers Structures 293
Summary 295
Chapter 10 Debugging Windows 2000 Services and DLLs That Load into Services 297
Service Basics 298
The API Dance 298
The Security Dance 299
Debugging Services 300
Debugging the Core Code 301
Debugging the Basic Service 301
Debugging for Real 306
Summary 306
Chapter 11 Multimachine, Multiprocess Tracing 307
TraceSrv Requirements 308
TraceSrv and Dcomcnfg 317
Initial Problems with TraceSrv 319
TraceView and Security 321
Using TraceSrv 323
Summary 325
Chapter 12 Multithreaded Deadlocks 327
Multithreading Tips and Tricks 327
Don't Do It 328
Multithread Only Small, Discrete Pieces 328
Synchronize at the Lowest Level 328
Review the Code--And Review the Code Again 328
Test on Multiprocessor Machines 329
DeadlockDetection Requirements 329
High-Level Design Issues with DeadlockDetection 332
Using DeadlockDetection 334
Implementing DeadlockDetection 337
Hooking Imported Functions 337
Implementation Highlights 345
What's Next for DeadlockDetection? 357
Summary 359
Chapter 13 Automated Testing 361
The Bane of Unit Testing: User Interfaces 361
Tester Requirements 362
Using Tester 364
Implementing Tester 368
What's Next for Tester? 385
Summary 386
Chapter 14 Limiting OutputDebugString Calls 387
Also-Ran Solutions 388
LIMODS Requirements 389
Using LIMODS 389
Living with MFC 389
Calling LIMODS from Your Code 391
Selecting Which Source Files to Trace From 393
Implementing LIMODS 394
Determining Source Code Ranges 394
LOM Files Explained 395
Excluding Source Files from LOM Files 396
What LIMODSDLL.DLL Hooks 397
Handling __cdecl Hooks 397
Hooking Functions Exported by Ordinal Value 399
General Implementation Issues 402
What's Next for LIMODS? 404
Summary 404
Chapter 15 The Debug C Run-Time Library 405
Features of the Debug C Run-Time Library 406
Using the Debug C Run-Time Library 407
Choosing the Right C Run-Time Library for Your Application 409
Using MemDumperValidator 411
Using MemDumperValidator with C++ 418
Using MemDumperValidator with C 419
Deep Validations 420
Implementing MemDumperValidator 424
Initialization and Termination in C++ 426
Where Have All the Leak Reports Gone? 427
Using MemStress 428
An Interesting Stress Problem 430
Summary 431
Part IV Appendixes
Appendix A Reading Dr. Watson Log Files 435
Windows 2000 Dr. Watson Log 435
Windows 98 Dr. Watson Log 442
Appendix B Resources for Windows Developers 445
Books 445
Software Development 446
Languages 446
Debugging and Testing 447
Windows and Windows Technologies 447
The CPU and Hardware 448
Tools 449
Web Sites 450
Index 453
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Foreword

If this were a normal foreword, I'd begin by relating some alarming stories about bugfilled programs and warning that buggy applications are the root of society's evils. I'd probably then go on to spout statistics from a research report about the average number of bugs per 100 LOC (lines of code). These issues are legitimate, but I figure that if you're reading this book, you know that keeping bugs out of your code is important. As I see it, I have three tasks here:
  • Explain who the heck John Robbins is
  • Tell you why you want to read this book
  • Tell some good stories about John Robbins

My first encounter with John was on a CompuServe forum. He was working on a homebrew debugger and had posted a question about the Microsoft Win32 Debugging API. In jest, he added that if he finished his debugger, maybe he could get a job at NuMega. I noticed the message and replied to him. I also mentioned that, incidentally, NuMega was looking for people (debugger nerds being hard to come by).

So began John's roller-coaster ride at NuMega. John showed up for his interview wearing a suit (probably his only one) and carrying a stack of neatly formatted floppies that contained his sample code, which was his completed debugger. During the interview, one of NuMega's owners fell asleep. (Or so John thought. The owner was actually focusing very intently.) John figured his chance at a job was gone right there, but in fact, he impressed everyone. A few months after John had been hired, he noticed that I was using one of his sample code disks as a coffee coaster. The truth was, I knew just from talking to him that John was hardcore about debugging, and I didn'tneed to check out the code.

In those days, NuMega was pretty small and was completely focused on getting cutting-edge debugging tools into developers' hands. John paid his dues in this crusade. He was so anxious to start work at NuMega that he moved from Virginia to New Hampshire almost immediately and rented one of the first places he found, a small house behind a fire station. Every time the fire station's doors roared open, John's PC lost power. At work, his first assignment was to write BugBench, a utility that demonstrated every error that BoundsChecker could catch. During that time, we rightfully called John the world's buggiest programmer.

A few months later, John's PC began freezing for roughly 10 seconds every hour or so, Despite his sharp words with the network administrator, no solution was forthcoming. Finally, John got his hands on a very early version of SoftICE for Windows NT (NuMega's kernel debugger). It didn't take long for John to figure out that another engineer had placed a Windows NT service on John's machine that counted to 175 million at random intervals using a time-critical thread. Try as he might, John was never able to top that prank.

A big part of NuMega in those days was sending engineers to trade shows. John's outgoing personality made him a natural target for the marketing folks, who were eager to include him in the booth presentations. One of the more, ahem, lame concepts involved a skit that had John starring as "a researcher at the Center for Bug Control in Atlanta." John wanted no part of this escapade, so he and another engineer came up with a completely different concept, an idea that became the genesis of the world-famous "Senior Boy and Junior Boy" skit. John was "Senior Boy," which became one of many nicknames John acquired at NuMega. I'll leave the origination of "Sporkie Boy" to your imagination.

As a footnote to that trade show, it was also where John learned what's really inside those stress-relieving balloons seemingly filled with sand. In this particular instance, the filling appeared to be tiny fragments of walnut shells. As John held the balloon over his head, he managed to puncture it, covering both of us-nay, the entire hotel room-in walnut shells. The shells even managed to find their way into the blankets and sheets of the beds.

The first half of John's time at NuMega was spent working on all aspects of BoundsChecker. His duties included developing the debugger loop, writing API validation stubs, fixing symbol table bugs, tweaking with the reference-counting algorithm for COM interfaces, and extending the code for streaming program trace information to disk. All in the same day! Debugging a debugging tool, especially one that takes liberties with the operating system, provides plenty of opportunity to hone your debugging skills.

Often John and I weren't able to use a debugger on the tough problems. One problem in particular I remember was when I ran BoundsChecker on Microsoft Visual SourceSafe the night before an important beta. It seemed to run fine, but a few minutes latey, another engineer noticed that the file dates in Visual Sourcesafe were something like "@@1?70." Regular backups weren't yet a part of our engineering process, so I ended up nearly completely destroying the version control database that held the only copy of the source code. Needless to say, the entire company was out for my hide, but John and I knuckled down and discovered that Visual SourceSafe was using some legacy MS-DOS code that trashed our file handles.

You might be wondering, "Why all these stories?" My point is that John is no academic or abstract theorist. John has walked the walk (and definitely likes to talk the talk). John and I frequently lament the fact that so many programming books are written by people who have little or no commercial development experience and who don't write programs that exceed 100 lines. John was a lead developer on several award-winning products. When he writes, he's conveying information learned from his hard-won experiences.

When John decides to do something, he does it whole hog. He will wrestle with a subject until he has it completely pinned. "I couldn't figure it out" isn't in John's vocabulary. Before John began his writing career, he offered to help me with a few functions for a Microsoft Systems Journal (MSJ) column I was working on. I think he spent more time on the code than I did. Because we both now write columns for MSJ, we regularly swap stories on the horrors we encounter while writing the code that accompanies our columns. On many occasions, his descriptions of how far he went to chase down a problem have left me slack-jawed.

Writing a book requires more than just knowledge of the subject matter. It also requires a desire to communicate this knowledge effectively to the reader. I noticed John's easy way with words in his very first article. I still consider it a treat to read anything by John Robbins. It's a pleasure to read something when I know the author truly understands the subject matter, has a passion for communicating it, and doesn't make it sound more complicated than it needs to.

John's enthusiasm for writing extends beyond just his articles, his columns, and this book. John leaves his stamp in just about any code he writes, as this excerpt from a classic e-mail I received at work shows:

What is with all this "DISCUSSION" crap John litters the core with? Every damn function header is prefaced with a complete chapter on the sociological implications of using the routine and how planets may misalign if you use them improperly - last month's MSJ was nearly a friggin book, most of it filled with all of this "DISCUSSION" crap - he wrote almost a book in and of itself for his "Form Load" handler. Is the man an author or an engineer? Jeez...

As you'll see in this book, the answer is both!

Debugging is a subject that's shrouded in mystery, and in many ways it's an oral tradition. Good texts are sorely needed. The few books available focus mostly on sanitized situations and don't get into the swampy details that effective Windows debugging often entails. From time to time, publishers have approached me about writing a book on debugging, and I've always declined. It's not that I don't know enough about debugging. Rather, I find it difficult to quantify my gut-level debugging knowledge into something that can be put on paper. John doesn't have this problem.

From my perspective, effective debugging is pretty simple at a high level. I always come back to two tenets:

  • Know what's supposed to be happening
  • Know how to use your tools to see what's really happening

If you have these two things nailed, debugging is usually straightforward. The problem is, both of the above items aren't so easy to pull off. When I say "Know what's supposed to be happening," I don't expect your knowledge to stop at your source code. You have to be able to see both the big picture and the microscopic details. What did the compiler mutate your code into? What happens inside that API call? If you can't answer these questions, you're flying blind.

I'm not saying that to debug you need to trace through every instruction. Rather, when the need arises, you should be able to keep breaking the problem into smaller and smaller pieces-something John recommends in Chapter 1 of this book. You might also have to dig into components that you don't control to find the cause of a crash. Eventually, you'll find the answer if you go deep enough into the bits. A lot of tracking down bugs requires you to know the intricacies of your language, operating system, and CPU-another topic John covers in Chapter 1. The chapter on the minimum amount of x86 assembly language you should know (Chapter 6) will be an invaluable resource for you.

Likewise, knowing how to use your tools effectively is critical. Debugging tools have become fairly sophisticated, and many developers never get (or don't take) the opportunity to become familiar with the full range of their tools' capabilities. I'm reminded of a friend who had a brilliant young graphics programmer working for him. When the prodigy's code crashed one day, he had no idea that his debugger could show him a call stack.

Too many developers learn just enough debugging skills to get them out of their current jam. Often, users overlook great features of debugging tools because the situation in which to use them isn't put into the proper context. Reading through documentation, feature by feature, gets boring, and you learn only the most basic information. John's chapters on power debugging in the Microsoft Visual C++ and Microsoft Visual Basic debuggers (chapters 5 through 7) take you far past the tedium of "step, step, step. Inspect. Step, step, step..."

When I say debugging is an oral tradition, I mean that most people learn a new debugging skill or technique only when they hear about someone else using it to solve a problem. When you watch a master at work with good debugging tools, you can learn 10 times as "much in 30 minutes as you would in a day of reading the documentation by yourself. John is. just such a master of debugging. He knows the strengths and weaknesses of all the tools he uses. He also invests his time up front to write great diagnostic code that more than pays for itself later. You can do the same for yourself by making debugging a skill that you continually enhance rather than a chore. This book is chock full of nuggets of John's debugging gold to help speed you on your way.

Matt Pietrek
Hollis, New Hampshire
December 1999

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  • Anonymous

    Posted February 29, 2000

    The bugslayer has struck again !!!

    Unbelievable John Robbins has slain yet another bug-beast with this 'must have' developer's guide to preventing, finding, killing and eradicating bugs from your code !!! This book is great and will revolutionize the ever-befuddling world of debugging. I highly recommend it to all software developers throughout the world.

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