WM_DEVICECHANGE - Win32 Programmer's Reference

Win32 Programmer's Reference

Home Index About

Custom Search

Overview

Group

Quick Info

Windows NT
Yes
Win95
Yes
Win32s
No
Import Library
-
Header File
winuser.h
Unicode
No
Platform Notes
None

WM_DEVICECHANGE

The WM_DEVICECHANGE device message notifies an application or device driver of a change to the hardware configuration of a device or the computer.

Event = (UINT) wParam;
dwData = (DWORD) lParam;

Parameters
Event

Event type. This parameter can be one of the following values:

Value	Meaning
DBT_CONFIGCHANGECANCELED	A request to change the current configuration (dock or undock) has been canceled.
DBT_CONFIGCHANGED	The current configuration has changed, due to a dock or undock.
DBT_DEVICEARRIVAL	A device has been inserted and is now available.
DBT_DEVICEQUERYREMOVE	Permission is requested to remove a device. Any application can deny this request and cancel the removal.
DBT_DEVICEQUERYREMOVEFAILED	A request to remove a device has been canceled.
DBT_DEVICEREMOVECOMPLETE	A device has been removed.
DBT_DEVICEREMOVEPENDING	A device is about to be removed. Cannot be denied.
DBT_DEVICETYPESPECIFIC	A device-specific event has occurred.
DBT_QUERYCHANGECONFIG	Permission is requested to change the current configuration (dock or undock).
DBT_USERDEFINED	The meaning of this message is user-defined.

dwData

Address of a structure that contains event-specific data. Its meaning depends on the given event.

Return Values
Return TRUE to grant a requested action.

Return QUERY_BROADCAST_DENY to deny a requested action.

Remarks
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 forcibly removes a device, it may not send a DBT_DEVICEQUERYREMOVE message before doing so.

DBT_CONFIGCHANGECANCELED, DBT_CONFIGCHANGED, DBT_DEVICEARRIVAL, DBT_DEVICEQUERYREMOVE, DBT_DEVICEQUERYREMOVEFAILED, DBT_DEVICEREMOVECOMPLETE, DBT_DEVICEREMOVEPENDING, DBT_DEVICETYPESPECIFIC, DBT_QUERYCHANGECONFIG, DBT_USERDEFINED

Last news from Greatis Software

    Nostalgia .Net     .Net is powerful, but not all-powerful, so sometimes we need to use Win32 API for our .Net applications. It's simple enough with Platform Invoke if you have Win32 skill, but we do not always have time to dig the ancient documentation, declare the special types that are compatible with Win32, find the values of the Win32's constants and so on. Nostalgia .Net offers several simple-to-use classes, and components that will allow you to forget about the headache of Win32 and just use the power of Win32 in your application the same way as you use the native. Net classes. More »

Recommended software for developers

    Ultimate Pack     Component pack for Delphi and C++ Builder that contains runtime form designer, runtime object inspector, print suite and much more for the very special price. More »

    Form Designer .Net     Unique runtime form design solution that allows to edit any form in .Net WinForms application at runtime with full source codes for only 300 euro! More »

    Print Suite .Net     Print Suite .Net is a set of components for easy printing texts, images and grids from your WinForms applications. Full C# source codes are available More »

    Gradient Controls .Net     Gradient Controls .Net offers controls with gradient background feature. Labels, panels and so on... Full C# source codes are available More »

    Greatis iGrid     iGrid plots drawing grid right over your desktop, so you can use it everywhere, with any drawing application without any special plugins for different graphic editors. More »

All the contacts and projects

Dmitry Vasiliev (just.dmitry)

More Online Helps

Win32 Programmer's Reference
Win32 Multimedia Programmer's Reference
OLE Programmer's Reference
Microsoft Windows Pen API Programmer's Reference
Microsoft Windows Sockets 2 Reference
Microsoft Windows Telephony API (TAPI) Programmer's Reference
Unix Manual Pages

greatis just4fun network