The Old New Thing

January 2011 - The Old New Thing

Solutions that require a time machine: Making applications which require compatibility behaviors crash so the developers will fix their bug before they ship

January 31, 2011 Jan 31, 2011 01/31/11
Raymond Chen
A while ago, I mentioned that there are many applications that rely on WM_PAINT messages being delivered even if there is nothing to paint because they put business logic inside their WM_PAINT handler. As a result, Windows sends them dummy WM_PAINT messages. Jerry Pisk opines, Thanks to the Windows team going out of their way not to break ...

How do you obtain the icon for a shortcut without the shortcut overlay?

January 27, 2011 Jan 27, 2011 01/27/11
Raymond Chen
The easy one-stop-shopping way to get the icon for a file is to use the SHGet­File­Info function with the SHGFI_ICON flag. One quirk of the SHGet­File­Info function is that if you pass the path to a shortcut file, it will always place the shortcut overlay on the icon, regardless of whether you passed the SHGFI_ADD­OVERLAYS...
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Microspeak: Leverage

January 26, 2011 Jan 26, 2011 01/26/11
Raymond Chen
At Microsoft, leverage is not a term of physics whereby a force can be magnified by the application of mechanical advantage. It is also not a term of finance whereby the power of a small amount of money can be magnified by the assumption of debt. In fact, at Microsoft, the word leverage isn't even a noun. It is a verb: to leverage, leverages, ...

Why does the name of my TEMP directory keep changing?

January 25, 2011 Jan 25, 2011 01/25/11
Raymond Chen
A customer liaison contacted the shell team with the following request: Subject: Support case: 069314718055994 On two of my customer's machines, he's finding that if he opens %TEMP% from the Start menu, it opens C:\Users\username\AppData\Local\Temp\1, C:\Users\username\AppData\Local\Temp\2, and so on. Each time the user logs off and back on...

There's a default implementation for WM_SETREDRAW, but you might be able to do better

January 24, 2011 Jan 24, 2011 01/24/11
Raymond Chen
If your window doesn't have a handler for the WM_SET­REDRAW message, then Def­Window­Proc will give you a default implementation which suppresses WM_PAINT messages for your window when redraw is disabled, and re-enables WM_PAINT (and triggers a full repaint) when redraw is re-enabled. (This is internally accomplished by making the...
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The 2011/2012 Seattle Symphony subscription season at a glance

January 21, 2011 Jan 21, 2011 01/21/11
Raymond Chen
Every year, I put together a little pocket guide to the Seattle Symphony subscription season for my symphony friends to help them decide which ticket package they want. As before, you might find it helpful, you might not, but either way, you're going to have to suffer through it. Here's the at-a-glance season guide for the first season ...

Modality, part 9: Setting the correct owner for modal UI, practical exam

January 21, 2011 Jan 21, 2011 01/21/11
Raymond Chen
Here's a question that came from a customer. You can answer it yourself based on what you know about modal UI. (If you're kind of rusty on the topic, you can catch up here.) I've left in some irrelevant details just to make things interesting. Our program launches a helper program to display an Aero Wizard to guide the user through ...
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How to turn off the exception handler that COM "helpfully" wraps around your server

January 20, 2011 Jan 20, 2011 01/20/11
Raymond Chen
Historically, COM placed a giant try/except around your server's methods. If your server encountered what would normally be an unhandled exception, the giant try/except would catch it and turn it into the error RPC_E_SERVERFAULT. It then marked the exception as handled, so that the server remained running, thereby "improving robustness by ...
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Why didn't they use the Space Shuttle to rescue the Apollo 13 astronauts?

January 19, 2011 Jan 19, 2011 01/19/11
Raymond Chen
Many decisions make sense only in the context of history. Much like the moviegoers who were puzzled why NASA didn't just use the Space Shuttle to rescue the Apollo 13 astronauts, computer users of today, when looking back on historical decisions, often make assumptions based on technology that didn't exist. Consider, for example, pointing ...

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