The Old New Thing
Practical development throughout the evolution of Windows.
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Aug 8, 2025
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2
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Under what conditions could a ReadFile or WriteFile fail to transfer all of the bytes, and how do I detect that?
If there is not enough data to read, or not room to write.
Aug 7, 2025
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6
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2
How can I detect that Windows is running in S-Mode?
Check the code integrity policy.
Aug 6, 2025
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6
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4
How do I disable pieces of the property sheet for a service in the Services MMC snap-in?
There's no secret setting. It's all based on access control.
Aug 5, 2025
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12
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3
Why are Windows semiannual updates named H1 and H2?
To address an unconscious bias.
Aug 4, 2025
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22
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How can I read more than 4GB of data from a file in a single call to ReadFile?
You can't, but you can try to fake it.
Aug 1, 2025
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2
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Two related questions about keeping track of PIDs of IPC clients
Since you're doing IPC, you may as well let IPC do the work for you.
Jul 31, 2025
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7
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A consequence of the weird wReserved value at the start of the DECIMAL structure
It overwrites things by accident.
Jul 30, 2025
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2
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In C++/WinRT, how can I await multiple coroutines and capture the results?, part 0
If you don't really care about what happens if something goes wrong.
Jul 29, 2025
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16
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3
Why is there a window with no name blocking Windows shutdown?
They never expected you to see it.