The Old New Thing

Practical development throughout the evolution of Windows.

Latest posts

Clipping the focus item when looking for its on-screen location, part 3
Jan 14, 2026
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Clipping the focus item when looking for its on-screen location, part 3

Raymond Chen
Raymond Chen

Finding <I>all</I> the clipping parents.

Clipping the focus item when looking for its on-screen location, part 2
Jan 13, 2026
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Clipping the focus item when looking for its on-screen location, part 2

Raymond Chen
Raymond Chen

Finding the correct clipping parent.

Clipping the focus item when looking for its on-screen location
Jan 12, 2026
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Clipping the focus item when looking for its on-screen location

Raymond Chen
Raymond Chen

Preventing the cursor from pointing to nothing.

Using Active Accessibility to find out where the focus item is
Jan 9, 2026
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Using Active Accessibility to find out where the focus item is

Raymond Chen
Raymond Chen

Looking at child objects.

Using Active Accessibility to find out where the Windows caret is
Jan 8, 2026
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Using Active Accessibility to find out where the Windows caret is

Raymond Chen
Raymond Chen

It's old and rather simple, but we like simple.

How can I find out where the Windows caret is?
Jan 7, 2026
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How can I find out where the Windows caret is?

Raymond Chen
Raymond Chen

You'll have go to a larger scope.

Swapping two blocks of memory that reside inside a larger block, in constant memory, refinement
Jan 6, 2026
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Swapping two blocks of memory that reside inside a larger block, in constant memory, refinement

Raymond Chen
Raymond Chen

Could do with a little less rotating.

How can you swap two non-adjacent blocks of memory using only forward iterators?
Jan 5, 2026
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How can you swap two non-adjacent blocks of memory using only forward iterators?

Raymond Chen
Raymond Chen

Applying the rotation trick to our new problem.

How can you swap two adjacent blocks of memory using only forward iterators?
Jan 2, 2026
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How can you swap two adjacent blocks of memory using only forward iterators?

Raymond Chen
Raymond Chen

A different algorithm, employing a different kind of cleverness.

Swapping two blocks of memory that reside inside a larger block, in constant memory
Jan 1, 2026
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Swapping two blocks of memory that reside inside a larger block, in constant memory

Raymond Chen
Raymond Chen

A variation on the constant-memory rotation.

2025 year-end link clearance
Dec 31, 2025
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2025 year-end link clearance

Raymond Chen
Raymond Chen

Another year gets relegated to history.

Understanding and mitigating a stack overflow in our task sequencer
Dec 31, 2025
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Understanding and mitigating a stack overflow in our task sequencer

Raymond Chen
Raymond Chen

The recurring problem of synchronous resumption.

Additional notes on color-keyed overlays as a way of doing smooth video rendering
Dec 30, 2025
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Additional notes on color-keyed overlays as a way of doing smooth video rendering

Raymond Chen
Raymond Chen

Choosing the color-key and other brief discussions.

The Gävle Goat (Gävlebocken) succumbs in 2025 to a new menace
Dec 29, 2025
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The Gävle Goat (Gävlebocken) succumbs in 2025 to a new menace

Raymond Chen
Raymond Chen

You could blow me over.

How can I detect that the system is running low on memory? Or that my job is running low on memory?
Dec 29, 2025
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How can I detect that the system is running low on memory? Or that my job is running low on memory?

Raymond Chen
Raymond Chen

You can register for a memory notification.

Why are we worried about memory access semantics? Full barriers should be enough for anybody
Dec 26, 2025
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Why are we worried about memory access semantics? Full barriers should be enough for anybody

Raymond Chen
Raymond Chen

You have to find new ways of going faster.

Reading the fine print, episode 4: Holiday promotions
Dec 25, 2025
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Reading the fine print, episode 4: Holiday promotions

Raymond Chen
Raymond Chen

Checking those validity dates.

Why is the last letter of my string not making it to the clipboard?
Dec 25, 2025
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Why is the last letter of my string not making it to the clipboard?

Raymond Chen
Raymond Chen

The struggle for null termination.