The Old New Thing : Code

Thursday, July 03, 2008 7:00 AM

How did the invalid floating point operand exception get raised when I disabled it?

When it changes behind your back.

Posted by oldnewthing | 23 Comments

Filed under: Code

Wednesday, July 02, 2008 7:00 AM

Uninitialized floating point variables can be deadly

The dreaded sNaN exception.

Posted by oldnewthing | 49 Comments

Filed under: Code

Friday, June 27, 2008 7:00 AM

GUIDs are globally unique, but substrings of GUIDs aren't

Half of a GUID is worse than none.

Posted by oldnewthing | 40 Comments

Filed under: Code

Monday, June 23, 2008 7:00 AM

Just because you're using a smart pointer class doesn't mean you can abdicate understanding what it does

Proper use.

Posted by oldnewthing | 38 Comments

Filed under: Code

Monday, June 16, 2008 7:00 AM

How do the common controls convert between ANSI and Unicode?

It goes through CP_ACP.

Posted by oldnewthing | 10 Comments

Filed under: Code

Wednesday, June 11, 2008 7:00 AM

If you say that you don't care about something, you shouldn't be upset that it contains garbage

Because you said you didn't care.

Posted by oldnewthing | 32 Comments

Filed under: Code

Monday, June 09, 2008 7:00 AM

Why are DLLs uninitialized in the "wrong" order?

The same reason they unload in the "wrong" order.

Posted by oldnewthing | 4 Comments

Filed under: Code

Friday, June 06, 2008 7:00 AM

Why does OpenProcess succeed even when I add three to the process ID?

An artifact of the implementation, not contractual.

Posted by oldnewthing | 41 Comments

Filed under: Code

Monday, June 02, 2008 7:00 AM

Why are accelerators for hidden controls still active?

Accessibility.

Posted by oldnewthing | 15 Comments

Filed under: Code

Wednesday, May 28, 2008 7:00 AM

Reading a contract from the other side: SHSetInstanceExplorer and SHGetInstanceExplorer

Maintaining a reference on the process from a shell extension.

Posted by oldnewthing | 27 Comments

Filed under: Code

Tuesday, May 27, 2008 7:00 AM

You can't give away something that isn't yours

Works in code just like in real life.

Posted by oldnewthing | 12 Comments

Filed under: Code

Friday, May 23, 2008 7:00 AM

What does TranslateAccelerator do?

It translates accelerators, of course.

Posted by oldnewthing | 13 Comments

Filed under: Code

Tuesday, May 20, 2008 7:00 AM

The Phantom Bug: Why doesn't MessageBox work from my WM_NCDESTROY handler?

A puzzle.

Posted by oldnewthing | 5 Comments

Filed under: Code

Monday, May 12, 2008 7:00 AM

How do I flash my window caption and taskbar button manually?

FlashWindowEx.

Posted by oldnewthing | 19 Comments

Filed under: Code

Friday, May 09, 2008 7:00 AM

Data breakpoints are based on the linear address, not the physical address

Data can change without the breakpoint firing.

Posted by oldnewthing | 6 Comments

Filed under: Code

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How did the invalid floating point operand exception get raised when I disabled it?

Uninitialized floating point variables can be deadly

GUIDs are globally unique, but substrings of GUIDs aren't

Just because you're using a smart pointer class doesn't mean you can abdicate understanding what it does

How do the common controls convert between ANSI and Unicode?

If you say that you don't care about something, you shouldn't be upset that it contains garbage

Why are DLLs uninitialized in the "wrong" order?

Why does OpenProcess succeed even when I add three to the process ID?

Why are accelerators for hidden controls still active?

Reading a contract from the other side: SHSetInstanceExplorer and SHGetInstanceExplorer

You can't give away something that isn't yours

What does TranslateAccelerator do?

The Phantom Bug: Why doesn't MessageBox work from my WM_NCDESTROY handler?

How do I flash my window caption and taskbar button manually?

Data breakpoints are based on the linear address, not the physical address