Old New Thing

Preface xxiii Acknowledgments xxvii About the Author xxix Chapter One: Initial Forays into User Interface Design Why do you have to click the Start button to shut down? 1

Why doesn't Windows have an "expert mode"? 2

The default answer to every dialog box is Cancel 3

The best setting is the one you don't even sense, but it's there, and it works the way you expect 6

In order to demonstrate our superior intellect, we will now ask you a question you cannot answer 7

Why doesn't Setup ask you if you want to keep newer versions of operating system files? 7

Thinking through a feature 9

When do you disable an option, and when do you remove it? 12

When do you put ... after a button or menu? 13

User interface design for vending machines 13

User interface design for interior door locks 15

The evolution of mascara in Windows UI 16

Chapter Two: Selected Reminiscences on Windows 95 Why isn't my time zone highlighted on the world map? 19

Why didn't Windows 95 boot with more than 1GB of memory? 20

Why did Windows 95 have functions called BEAR, BUNNY, and PIGLET? 22

What about BOZOSLIVEHERE and TABTHETEXTOUTFORWIMPS? 23

What was in the Windows 95 Special Edition box? 25

Windows brings out the Rorschach test in everyone 25

The martial arts logon picture 26

Why a really large dictionary is not a good thing 27

An insight into the Windows 95 startup sound 27

It's a lot easier to write a column if you don't care about accuracy 28

Why does the System Properties page round the memory size? 29

Why does my hard drive light flash every few seconds? 29

The hunt for a faster syscall trap 30

One byte used to cost a dollar 31

Each product-support call costs a sale 32

Why isn't Tweak UI included on the Windows CD? 32

Turns out that you can't install Windows via xcopy 34

Buying an entire Egghead Software store 35

The history of the Windows PowerToys 35

How did Windows choose its final build numbers? 38

Why doesn't the build number increment for service packs? 39



Chapter Three: The Secret Life of GetWindowText

How windows manage their text 41

Enter GetWindowText 42

What if I don't like these rules? 43

Can you give an example where this makes a difference? 44

Why are the rules for GetWindowText so weird? 44



Chapter Four: The Taskbar and Notification Area

Why do some people call the taskbar the "tray"? 47

Why does the taskbar default to the bottom of the screen? 49

Why doesn't the clock in the taskbar display seconds? 50

Why doesn't the taskbar show an analog clock? 51

When I dock my taskbar vertically, why does the word "Start" disappear? 52

Why don't notification icons get a message when the user clicks the "X" button? 52

Chapter Five: Puzzling Interface Issues What are those little overlay icons? 53

Why are these unwanted files/folders opening when I log on? 54

What do the text label colors mean for files? 56

Why does my advanced options dialog say ON and OFF after every option? 57

What determines the order in which icons appear in the Alt+Tab list? 58

Why is the read-only property for folders so strange? 59

What's with those blank taskbar buttons that go away when I click on them? 59

What is the difference between Minimize All and Show Desktop? 60 What does boldface on a menu mean? 62

Where do those customized Web site icons come from? 62

Where did my task manager tabs and buttons go? 63

Will dragging a file result in a move or a copy? 64

Why does the Links folder keep re-creating itself? 65

Why are documents printed out of order when you multiselect and choose Print? 66

Raymond spends the day doing product support 67

Blow the dust out of the connector 68

How much is that gigabyte in the window? 69

Why can't I remove the "For test/evaluation purposes only" tag? 70

Chapter Six: A History of the GlobalAlloc Function The early years 71

Selectors 73

Transitioning to Win32 75

A peek at the implementation 76

Chapter Seven: Short Topics in Windows Programming The scratch program 79

Getting a custom right-click menu for the caption icon 85

What's the difference between CreateMenu and CreatePopupMenu? 86

When does the window manager destroy menus automatically? 88

Painting only when your window is visible onscreen 89

Determining whether your window is covered 93

Using bitmap brushes for tiling effects 95

What is the DC brush good for? 98

Using ExtTextOut to draw solid rectangles 100

Using StretchBlt to draw solid rectangles 102

Displaying a string without those ugly boxes 103

Semaphores don't have owners 110

An auto-reset event is just a stupid semaphore 112

Chapter Eight: Window Management Why do I get spurious WM_MOUSEMOVE messages? 115

Why is there no WM_MOUSEENTER message? 118

The white flash 118

What is the hollow brush for? 119

What's so special about the desktop window? 120

The correct order for disabling and enabling windows 121

A subtlety in restoring the previous window position 122

UI-modality versus code-modality 123

The WM_QUIT message and modality 126

The importance of setting the correct owner for modal UI 129

Interacting with a program that has gone modal 132

A timed MessageBox, the cheap version 133

The scratch window 135

The bonus window bytes at GWLP_USERDATA 136

A timed MessageBox, the better version 136

A timed context menu 138

Why does my window receive messages after it has been destroyed? 139

Chapter Nine: Reminiscences on Hardware Hardware backward compatibility 141

The ghost CD-ROM drives 142

The Microsoft corporate network: 1.7 times worse than hell 143

When vendors insult themselves 144

Defrauding the WHQL driver certification process 145

A twenty-foot-long computer 146

The USB cart of death 147

New device detected: Boeing 747 147

There's an awful lot of overclocking out there 148

Chapter Ten: The Inner Workings of the Dialog Manager On the dialog procedure 151

The evolution of dialog templates 163

Why dialog templates, anyway? 196

How dialogs are created 197

The modal dialog loop 204

Nested dialogs and DS_CONTROL 216

Why do we need a dialog loop, anyway? 224

Why do dialog editors start assigning control IDs with 100? 225

What happens inside DefDlgProc? 226

Never leave focus on a disabled control 228

What happens inside IsDialogMessage? 229

Why is the X button disabled on my message box? 237

Chapter Eleven: General Software Issues Why daylight saving time is nonintuitive 239

Why do timestamps change when I copy files to a floppy? 241

Don't trust the return address 242

Writing a sort comparison function 243

You can read a contract from the other side 245

The battle between pragmatism and purity 249

Optimization is often counterintuitive 250

On a server, paging = death 253

Don't save anything you can recalculate 254

Performance gains at the cost of other components 255

Performances consequences of polling 257

The poor man's way of identifying memory leaks 258

A cache with a bad policy is another name for a memory leak 259

Chapter Twelve: Digging into the Visual C++ Compiler Do you know when your destructors run? 267

The layout of a COM object 272

Adjustor thunks 274

Pointers to member functions are very strange animals 276

What is __purecall? 280

Chapter Thirteen: Backward Compatibility Sometimes an app just wants to crash 283

When programs grovel into undocumented structures 284

Why not just block the applications that rely on undocumented behavior? 286

Why 16-bit DOS and Windows are still with us 288

What's the deal with those reserved filenames such as NUL and CON? 290

Why is a drive letter permitted in front of UNC paths (sometimes)? 292

Do not underestimate the power of the game Deer Hunter 293

Sometimes the bug isn't apparent until late in the game 293

The long and sad story of the Shell Folders key 294

The importance of error code backward compatibility 297

Sure, we do that 298

When programs patch the operating system and mess up 299

The compatibility constraints of even your internal bookkeeping 300

Why does Windows keep your BIOS clock on local time? 301

Bad version number checks 302

The ways people mess up IUnknown::QueryInterface 303

When programs assume that the system will never change, Episode 1 305

When programs assume that the system will never change, Episode 2 306

The decoy Display Control Panel 308

The decoy visual style 309

Chapter Fourteen: Etymology and History What do the letters W and L stand for in WPARAM and LPARAM? 311

Why was nine the maximum number of monitors in Windows 98? 312

Why is a registry file called a hive? 312

The management of memory for resources in 16-bit Windows 312

What is the difference between HINSTANCE and HMODULE? 313

What was the purpose of the hPrevInstance parameter to WinMain? 316

Why is the GlobalWire function called GlobalWire? 317

What was the difference between LocalAlloc and GlobalAlloc? 318

What was the point of the GMEM_SHARE flag? 320

Why do I sometimes see redundant casts before casting to LPARAM? 321

Why do the names of the registry functions randomly end in Ex? 322

What's the difference between SHGetMalloc, SHAlloc, CoGetMalloc, and CoTaskMemAlloc? 324

Why is Windows Error Reporting nicknamed Dr. Watson? 329

What happened to DirectX 4? 330

Why are HANDLE return values so inconsistent? 331

Why do text files end in Ctrl+Z? 333

Why is the line terminator CR+LF? 334

TEXT vs. _TEXT vs. _T, and UNICODE vs. _UNICODE 335

Why are dialog boxes initially created hidden? 335

When you change the insides, nobody notices 336

If FlushInstructionCache doesn't do anything, why do you have to call it? 337

If InitCommonControls doesn't do anything, why do you have to call it? 338

Why did InterlockedIncrement/Decrement only return the sign of the result? 339

Why does the function WSASetLastError exist? 340

Why are there broadcast-based mechanisms in Windows? 340

Where did windows minimize to before the taskbar was invented? 341

Why didn't the desktop window shrink to exclude the taskbar? 343

Why does the caret stop blinking when I tap the Alt key? 343

What is the deal with the ES_OEMCONVERT flag? 345

The story behind file system tunneling 346

Why do NTFS and Explorer disagree on filename sorting? 347

The Date/Time Control Panel is not a calendar 350

How did Windows 95 rebase DLLs? 351

What are SYSTEM_FONT and DEFAULT_GUI_FONT? 353

Why do up-down controls have the arrows backward? 354

A ticket to the Windows 95 launch 355

Chapter Fifteen: How Window Messages Are Delivered and Retrieved Sent and posted messages 358

The life of a sent message 363

The life of a posted message 364

Generated posted messages 365

When does SendMessageCallback call you back? 368

What happens in SendMessageTimeout when a message times out? 369

Applying what you've learned to some message processing myths 370

How can you tell who sent or posted you a message? 371

You can't simulate keyboard input with PostMessage 371

Chapter Sixteen: International Programming Case mapping on Unicode is hard 373

An anecdote about improper case mapping 374

Why you can't rotate text 375

What are these directories called 0409 and 1033? 379

Keep your eye on the code page 379

Why is the default 8-bit codepage called "ANSI"? 388

Why is the default console codepage called "OEM"? 388

Why is the OEM code page often called ANSI? 389

Logical but perhaps surprising consequences of converting between Unicode and ANSI 391

Chapter Seventeen: Security World-writable files 393

Hiding files from Explorer 394

Stealing passwords 395

Silent install of uncertified drivers 396

Your debugging code can be a security hole 397

Why shared sections are a security hole 398

Internet Explorer's Enhanced Security Configuration doesn't trust the intranet 402

Chapter Eighteen: Windows 2000 and Windows XP Why doesn't the new Start menu use Intellimenus in the All Programs list? 403

Why is there no programmatic access to the Start menu pin list? 404

Why does Windows XP Service Pack 2 sometimes forget my CD autoplay settings? 406

The unsafe device removal dialog 407

Two brief reminiscences on the Windows XP Comments? button 408

Why does Explorer eject the CD after you finish burning it? 408

Why does Windows setup lay down a new boot sector? 409

Psychic debugging: Why your expensive four-processor machine is ignoring three of its processors 410

Psychic debugging: Why your CPU usage is hovering at 50% 411

What's the deal with the DS_SHELLFONT flag? 412

Why does DS_SHELLFONT = DS_FIXEDSYS | DS_SETFONT? 413

What other effects does DS_SHELLFONT have on property sheet pages? 414

Chapter Nineteen: Win32 Design Issues Why does Win32 fail a module load if an import could not be resolved? 417

Why are structure sizes checked strictly? 418

Why do I have to return this goofy value for WM_DEVICECHANGE? 421

The arms race between programs and users 422

Why can't you trap TerminateProcess? 424

Why do some processes stay in Task Manager after they've been killed? 424

Understanding the consequences of WAIT_ABANDONED 425

Why can't I put hyperlinks in notification icon balloon tips? 427

Why can't I use the same tree item multiple times? 429

The kooky STRRET structure 429

Why can't you set UTF-8 as your ANSI code page? 431

When should you use a sunken client area? 432

Why is there no all-encompassing superset version of Windows? 433

Why is it even possible to disable the desktop, anyway? 433

What are the window and menu nesting limits? 435

What's the difference between HWND_TOP and HWND_TOPMOST? 435

Chapter Twenty: Taxes Hierarchical Storage Management 438

Geopolitics 439

Remote Desktop Connection and Painting 440

Fast User Switching and Terminal Services 443

Multiple users 444 Roaming user profiles 445

Redirected folders 447

My Documents vs. Application Data 450

Large address spaces 451

Power management and detecting battery power 455

Intermittent network connectivity 457

Anti-aliased fonts and ClearType 459

High DPI displays 462

Multiple monitors 467

The work area 470

Displaying your pop-up windows in the right place 471

Accessibility 472

Chapter Twenty-One: Silliness The much-misunderstood "nop" action 481

Don't let Marketing mess with your slides 482

Whimsical bug reports 482

Watch out for those sample URLs 483

No code is an island 484

But I have Visual Basic Professional 485

It's all about the translucent plastic 485

My first death threat 486

You can't escape those AOL CDs 487

Giving fair warning before plugging in your computer 487

Spider Solitaire unseats the reigning champion 488

There's something about Rat Poker 489

Be careful what you name your product group 490

The psychology of naming your internal distribution lists 490

Differences between managers and programmers 491

Using floppy disks as semaphore tokens 492

When a token changes its meaning midstream 492

Whimsical embarrassment as a gentle form of reprimand 493

Using a physical object as a reminder 494

The office disco party 495

The Halloween-themed lobby 495

Index 497