Share via



The framework calls this member function to notify an application or device driver of a change to the hardware configuration of a device or the computer.


      afx_msg BOOL OnDeviceChange( 
   UINT nEventType, 
   DWORD_PTR dwData  


  • nEventType
    An event type. See the Remarks section for a description of the available values

  • dwData
    The address of a structure that contains event-specific data. Its meaning depends on the given event.


For devices that offer software-controllable features, such as ejection and locking, the operating system typically sends a DBT_DEVICEREMOVEPENDING message to let applications and device drivers end their use of the device gracefully.

If the operating system forcefully removes of a device, it may not send a DBT_DEVICEQUERYREMOVE message before doing so.

The nEvent parameter can be one of these values:


This member function is called by the framework to allow your application to handle a Windows message. The parameters passed to your function reflect the parameters received by the framework when the message was received. If you call the base-class implementation of this function, that implementation will use the parameters originally passed with the message and not the parameters you supply to the function.


Header: afxwin.h

See Also

CWnd Class
Hierarchy Chart