The Old New Thing

April 2014 - The Old New Thing

The StartRunNoHOMEPATH policy affects whether the user's HOME path is the current directory when you use Start.Run, but make sure you read that carefully

April 30, 2014 Apr 30, 2014 04/30/14
Raymond Chen
A customer (via the customer liaison) discovered that even though they had set the policy, they found "if the user creates a Notepad file, the file is searched in the user's HOME directory, in contradiction of policy," I asked the liaison to confirm: "The steps you describe are rather vague. Are you saying that the problem occurs when the ...

Showing a balloon tip at a specific position, then removing it

April 28, 2014 Apr 28, 2014 04/28/14
Raymond Chen
Today's Little Program shows a balloon tip at a specific position, then manually removes it. Start with our scratch program and make these changes: When our main window is created, we also create a balloon-style tooltip and add a tracking tool. Normally, the tooltip control appears and disappears automatically, at a position of the ...

A discovered quirk is just few steps away from becoming a feature

April 25, 2014 Apr 25, 2014 04/25/14
Raymond Chen
Commenter Cherry wonders who invented all those strange syntaxes, like to show all environment variables, including the hidden ones. An interesting historical note is the origin of the convention in unix that files whose names begin with a dot are hidden by default (here's the relevant portion). That article highlights how a discovered ...

I thought you could use SWP_FRAMECHANGED to force a control to recalculate its properties after a change in styles

April 24, 2014 Apr 24, 2014 04/24/14
Raymond Chen
Simon Cooke dug back into his memory and asked, "Doesn't calling with cause a recreate and re-apply of the styles?" The flag does not recreate anything, but it does reapply the styles, as far as it knows. Recall that the bits in the window style break into two parts. There are the styles managed by the window manager, which are in the ...

Le Chatelier's Principle in action: Administrative overrides

April 22, 2014 Apr 22, 2014 04/22/14
Raymond Chen
Today we have another example of Le Chatelier's Principle as interpreted by John Gall: Every system resists its proper functioning. There was a video card manufacturer which was using the key so that they could inject their DLL into every process. I have no idea why. Perhaps to get a nice bonus. In Windows Vista, the registry key was ...

How can I get information about the items in the Recycle Bin from script?

April 21, 2014 Apr 21, 2014 04/21/14
Raymond Chen
Today we'll do a scripting version of an old C++ program: Printing information about the items in the Recycle Bin. (How you wish to act on the information is up to you.) This is a pattern we've seen a lot. Bind to a folder, enumerate its contents, extract properties. Wow, that was way easier than doing it in C++! Just for fun, I'll ...

Raymond's house rules for Easter Egg Hunts

April 18, 2014 Apr 18, 2014 04/18/14
Raymond Chen
One of my colleagues frustrates his family by hiding the eggs for the annual Egg Hunt way too well. "Apparently, drawers and freezers are out of bounds in the traditional egg hunt." Here are my house rules for Easter Egg Hunts: Personally, I like to hide eggs in plain sight. It's surprising how long it can take somebody to find a yellow ...