Why does SetFocus fail without telling me why?

1 · Raymond Chen · June 14, 2019, 2 p.m.
One of my colleagues was debugging a program and discovered that a call to Set­Focus returned NULL, which the documentation calls out as indicating an error condition. However, a follow-up call to Get­Last­Error() returned 0, which means “Everything is just fine.” The post Why does SetFocus fail without telling me why? appeared first on The Old New Thing....
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