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並前往https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src/winmsg/wm-null.md

win32/wm-null.md at docs - GitHub

WM_NULL message. Performs no operation. An application sends the WM_NULL message if it wants to post a message that the recipient window will ignore.

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查詢 「wm_null」的人也找了：

  1. wm_showwindow
    2.
  2. wm_activateapp
    3.
  3. wm_size
    4.
  4. wm_ncactivate
    5.
  5. wm_querydragicon
    6.
  6. wm_stylechanged
    7.
  7. wm_userchanged
    8.
  8. wm_windowposchanged
    9.