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Code for Previous Blog Posts

Someone asked if I had a copy of the code I've been using in my blog so far. Well, I didn't as of 5pm today, so I went back and collected the code into 3 projects: propreader.exe <file> - Prints a list of all properties we know about the file propwriter.exe Read More...
Posted Tuesday, January 09, 2007 9:55 PM by benkaras | 0 Comments
Attachment(s): code.zip

Choosing your property API

It is time that I talk a little about what to do if you want your application to run on XP. There are three sets of APIs, each with subtle differences and caveats, and ultimately your choice requires deciding what platform your application must run on: Read More...
Posted Friday, January 05, 2007 12:00 PM by benkaras | 0 Comments
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Writing properties #9 - Summary

Coding to the Windows SDK Reading properties #7 - Summary Writing properties #1 - Simple beginnings Writing properties #2 - Filetype support? Writing properties #3 - Which properties are writable? Writing properties #4 - Which properties are writable? Read More...
Posted Tuesday, November 21, 2006 12:00 PM by benkaras | 0 Comments

Writing properties #8 - Canonical Values

There's one last topic I want to touch on before I close this series: Canonical values. So far I've talked about how to determine when the property itself is writable. But once you decide to write a property, how do you figure out what type the value Read More...
Posted Wednesday, November 15, 2006 12:38 PM by benkaras | 0 Comments

The deal with IPropertyStoreCapabilities

Have you ever felt this before? It's the day after you send your product to manufacturing . You step back, look at the big picture, and start to see minor flaws. A dread sinks in when you realize you just blogged about it too! That was Monday morning. Read More...
Posted Tuesday, November 14, 2006 11:47 AM by benkaras | 0 Comments

Writing properties #7 - IPropertyStoreCapabilities requires GPS_READWRITE

[Edit: 2006/11/13 - My original post got this topic entirely backwards. I've fixed the title and will provide details about this tomorrow. ] -Ben Karas Read More...
Posted Friday, November 10, 2006 12:00 PM by benkaras | 1 Comments

Writing properties #6 - GPS_READWRITE omits read-only data sources

You'll recall that there are multiple layers in the property system . In particular, the GPS_DEFAULT property system stack for files in the filesystem namespace looks like this: [ Application using GPS_DEFAULT ] [ Coercion Layer ] [ Shell Item Layer ]* Read More...
Posted Thursday, November 09, 2006 12:00 PM by benkaras | 1 Comments

Writing properties #5 - Property lists

So if a property handler doesn't enumerate which properties it supports writing , then how does the explorer pick which properties to show? Well, the shell namespace extension containing the item specifies the list of properties it wants to show in a Read More...
Posted Tuesday, November 07, 2006 12:00 PM by benkaras | 1 Comments

Writing properties #4 - Which properties are writeable?

I'm going to make a first stab at printing out a list of properties that are writable for a given file. I'll spoil the fun and let you know that my attempt today will not fully succeed. I'll explain later. For now, let's see some code! You'll recall I Read More...
Posted Monday, November 06, 2006 12:00 PM by benkaras | 0 Comments

Writing properties #1 - Simple beginnings

I'm going to be talking about writable properties over the next few days. I know that some of you are itching to try this out yourselves, so here is an overly simplistic program that will write a single property to a file. I have omitted a lot of diagnostic Read More...
Posted Monday, October 16, 2006 12:00 PM by benkaras | 2 Comments

Gotcha: You must release property stores quickly

The general rule is that you should minimize the length of time you have a property store open. It is best to acquire the data you need and then release the store. Read-only property stores lock files for reading using a filesystem oplock . An oplock Read More...
Posted Friday, October 13, 2006 12:00 PM by benkaras | 0 Comments
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Properties coding expedition #7 - The final output

This coding expedition has developed a tool that can dump out all the properties on a file. If you are curious about the property system, I highly recommend you build this tool and run it on various file types. Coding to the Windows SDK Part 1 - Binding Read More...
Posted Thursday, October 12, 2006 12:00 PM by benkaras | 2 Comments
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Properties coding expedition #6 - Developer friendly output

Using the tool I developed in this series, I know that my test photo has " Rating: 5 Stars ". But how is this value actually represented in the JPG itself? Let's answer that by adding some developer friendly output. Here's what I did: First, I need a Read More...
Posted Wednesday, October 11, 2006 12:00 PM by benkaras | 1 Comments
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Properties coding expedition #5 - Stripping characters

In Part 4 , I discovered that WideCharToMultiByte converts certain invisible non-spacing Unicode characters to ?. This makes the output look really silly in a command line application. I want to keep this as a command line application, so I need to strip Read More...
Posted Tuesday, October 10, 2006 12:00 PM by benkaras | 1 Comments
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Properties coding expedition #4 - The output

The program itself is provided in parts 1 , 2 , and 3 . So I compiled my program and ran it from the command line. Here's a snippet of what I got back: Properties for 'scan0010.jpg' Folder name: propshow Type: JPEG Image Name: scan0010.jpg Size: 638 KB Read More...
Posted Friday, October 06, 2006 5:00 PM by benkaras | 1 Comments
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