hwnd (HWND)

Window handle.

The interpretation of this handle is dependent upon the following notification codes:

• SPBN_UPARROW, SPBN_DOWNARROW, and SPBN_ENDSPIN.

  The param2 parameter is the handle to the currently selected spin field in a particular master-servant setup. If either the Up or Down Arrow is clicked on and none of a spin button's servants are currently selected, the master will return a handle to itself.

• SPBN_SETFOCUS

  The param2 parameter is the handle of the currently selected spin field.

  This message tells the application which spin field is selected.

• SPBN_KILLFOCUS

  The param2 parameter is NULLHANDLE if the spin field loses focus or no spin field is currently selected.

  This message tells the application when a spin field loses focus.

  Note: Both SPBN_KILLFOCUS and SPBN_SETFOCUS are set independently. You must check this message only when the application does not specify a master-servant relationship.

  
  SPBN_CHANGE

  The param2 parameter is the handle of the spin button in which the spin field text changed.

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