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並前往https://www.generacodice.com/en/articolo/529095/validate-hwnd-using-win32-api

Validate HWND using Win32 API - Genera Codice

You can use IsWindow() or also try to send the window a WM_NULL message with SendMessage(hWnd, WM_NULL) and see if it is successful.

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查詢 「wm_null」的人也找了：

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