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DBT_DEVNODES_CHANGED event

Applies to: desktop apps only

The system broadcasts the DBT_DEVNODES_CHANGED device event when a device has been added to or removed from the system. Applications that maintain lists of devices in the system should refresh their lists.

To broadcast this device event, the system uses the WM_DEVICECHANGE message with wParam set to DBT_DEVNODES_CHANGED and lParam set to zero.

Copy


LRESULT CALLBACK WindowProc(
  HWND hwnd,       // handle to window
  UINT uMsg,       // WM_DEVICECHANGE
  WPARAM wParam,   // device-change event
  LPARAM lParam    // event-specific data
);

Parameters

hwnd: A handle to a window.
uMsg: The WM_DEVICECHANGE message identifier.
wParam: Set to DBT_DEVNODES_CHANGED.
lParam: Set to zero.

Return value

Return TRUE.

Remarks

There is no additional information about which device has been added to or removed from the system. Applications that require more information should register for device notification using the RegisterDeviceNotification function.

Requirements

Minimum supported client	Windows XP
Minimum supported server	Windows Server 2003
Header	Dbt.h

DBT_DEVNODES_CHANGED event

Parameters

Return value

Remarks

Requirements

See also