The Old New Thing

December 2004 - The Old New Thing

Using fibers to simplify enumerators, part 3: Having it both ways

December 31, 2004 Dec 31, 2004 12/31/04
Raymond Chen
As we discovered in the previous two entries [second], the problem with enumeration is that somebody always loses. Now we will use fibers to fight back. Before you decide to use fibers in your programs, make sure to read the dire warnings at the end of this article. My goal here is to show one use of fibers, not to say that fibers are the ...
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Using fibers to simplify enumerators, part 2: When life is easier for the caller

December 30, 2004 Dec 30, 2004 12/30/04
Raymond Chen
Last time, we looked at how a directory tree enumerator function would have been written if the person writing the enumerator (the producer) got to write the spec. Now let's look at what it would look like if the person consuming the enumerator wrote the spec: #include <windows.h> #include <shlwapi.h> #include <stdio.h> #...
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Using fibers to simplify enumerators, part 1: When life is easier for the enumerator

December 29, 2004 Dec 29, 2004 12/29/04
Raymond Chen
The COM model for enumeration (enumeration objects) is biased towards making life easy for the consumer and hard for the producer. The enumeration object (producer) needs to be structured as a state machine, which can be quite onerous for complicated enumerators, for example, tree walking or composite enumeration. On the other hand, the ...
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Computing the size of a directory is more than just adding file sizes

December 28, 2004 Dec 28, 2004 12/28/04
Raymond Chen
One might think that computing the size of a directory would be a simple matter of adding up the sizes of all the files in it. Oh if it were only that simple. There are many things that make computing the size of a directory difficult, some of which even throw into doubt the even existence of the concept "size of a directory". Reparse ...

You can create an infinitely recursive directory tree

December 27, 2004 Dec 27, 2004 12/27/04
Raymond Chen
It is possible to create an infinitely recursive directory tree. This throws many recursive directory-traversal functions into disarray. Here's how you do it. (Note: Requires NTFS.) Create a directory in the root of your C: drive, call it C:\C, for lack of a more creative name. Right-click My Computer and select Manage. click on the Disk ...

Alton Brown book tour 2005: I’m Just Here for More Food

December 27, 2004 Dec 27, 2004 12/27/04
Raymond Chen
Alton Brown, geek cooking hero and Bon Appetit Magazine Cooking Teacher of the Year 2004 will be spending January 2005 promoting his latest book, Food × Mixing + Heat = Baking (I'm Just Here for More Food), sequel to his award-winning debut cookbook Food + Heat = Cooking (I'm Just Here for the Food). ...

Why does the system convert TEMP to a short file name?

December 24, 2004 Dec 24, 2004 12/24/04
Raymond Chen
When you set environment variables with the System control panel, the TEMP and TMP variables are silently converted to their short file name equivalents (if possible). Why is that? For compatibility, of course. It is very common for batch files to assume that the paths referred to by the %TEMP% and %TMP% environment variables do not ...
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How to open those plastic packages of electronics without injuring yourself

December 24, 2004 Dec 24, 2004 12/24/04
Raymond Chen
Small electronics nowadays come in those impossible-to-open plastic packages. A few weeks ago I tried to open one and managed not to slice my hand with the knife I was using. (Those who know me know that knives and I don't get along well.) Unfortunately, I failed to pay close attention to the sharp edges of the cut plastic and ended up cutting...

Do you need clean up one-shot timers?

December 23, 2004 Dec 23, 2004 12/23/04
Raymond Chen
The CreateTimerQueueTimer function allows you to create one-shot timers by passing the WT_EXECUTEONLYONCE flag. The documentation says that you need to call the DeleteTimerQueueTimer function when you no longer need the timer. Why do you need to clean up one-shot timers? To answer this, I would like to introduce you to one of my ...
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BOOL vs. VARIANT_BOOL vs. BOOLEAN vs. bool

December 22, 2004 Dec 22, 2004 12/22/04
Raymond Chen
Still more ways of saying the same thing. Why so many? Because each was invented by different people at different times to solve different problems. BOOL is the oldest one. Its definition is simply typedef int BOOL; The C programming language uses "int" as its boolean type, and Windows 1.0 was written back when C was the cool ...
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