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WM_LBUTTONDOWN & WM_LBUTTONUP not received

I created toplevel window, but for unknown reasons my WNDPROC does not receive WM_LBUTTONDOWN/WM_LBUTTONUP nor WM_MOUSEMOVE messages.

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查詢 「WM_LBUTTONUP」的人也找了：

  1. WM_MOUSEMOVE
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  2. WM_LBUTTONUP
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  3. C# WM_LBUTTONDOWN
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  4. WM_NCMOUSEMOVE
    5.
  5. WM_NCHITTEST
    6.
  6. MK_LBUTTON
    7.
  7. WM_NCLBUTTONDOWN
    8.
  8. WM_KEYDOWN
    9.