Discussion :

[dus]

Mon appli tourne sous W2000 et est codée en VC++6.0.
Elle fonctionne avec une dalle tactile et donc sans clavier ni souris.
J'arrive à détecter la connexion d'une clé usb avec le message ON_WM_DEVICECHANGE.
J'aimerais intercepter la connexion d'un clavier usb. Je reçois un évenement ON_WM_DEVICECHANGE avec un EventType que je ne sais pas analyser. quelqu'un a-t'il déjà fait ça ?

[mat.M]

: :

Tout est dans le MSDN

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/devio/base/wm_devicechange.asp

latform SDK: Device I/O
WM_DEVICECHANGE

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

A window receives this message through its WindowProc function.

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

Parameters

hwnd
Handle to window.
uMsg
WM_DEVICECHANGE identifier.
wParam
Event that has occurred. This parameter can be one of the following values from the Dbt.h header file.
Value Meaning
DBT_CONFIGCHANGECANCELED
0x0019 A request to change the current configuration (dock or undock) has been canceled.
DBT_CONFIGCHANGED
0x0018 The current configuration has changed, due to a dock or undock.
DBT_CUSTOMEVENT
0x8006 A custom event has occurred.

Windows NT 4.0 and Windows 95: This value is not supported.

DBT_DEVICEARRIVAL
0x8000 A device or piece of media has been inserted and is now available.
DBT_DEVICEQUERYREMOVE
0x8001 Permission is requested to remove a device or piece of media. Any application can deny this request and cancel the removal.
DBT_DEVICEQUERYREMOVEFAILED
0x8002 A request to remove a device or piece of media has been canceled.
DBT_DEVICEREMOVECOMPLETE
0x8004 A device or piece of media has been removed.
DBT_DEVICEREMOVEPENDING
0x8003 A device or piece of media is about to be removed. Cannot be denied.
DBT_DEVICETYPESPECIFIC
0x8005 A device-specific event has occurred.
DBT_DEVNODES_CHANGED
0x0007 A device has been added to or removed from the system.

Windows NT 4.0 and Windows Me/98/95: This value is not supported.

DBT_QUERYCHANGECONFIG
0x0017 Permission is requested to change the current configuration (dock or undock).
DBT_USERDEFINED
0xFFFF The meaning of this message is user-defined.
lParam
Pointer to a structure that contains event-specific data. Its format depends on the value of the wParam parameter. For more information, refer to the documentation for each event.

Return Values

Return TRUE to grant the request.

Return BROADCAST_QUERY_DENY to deny the request.
Remarks

For devices that offer software-controllable features, such as ejection and locking, the system typically sends a DBT_DEVICEREMOVEPENDING message to let applications and device drivers end their use of the device gracefully. If the system forcibly removes a device, it may not send a DBT_DEVICEQUERYREMOVE message before doing so.
Requirements
Client Requires Windows "Longhorn", Windows XP, Windows 2000 Professional, Windows NT Workstation 4.0, Windows Me, Windows 98, or Windows 95.
Server Requires Windows Server "Longhorn", Windows Server 2003, Windows 2000 Server, or Windows NT Server 4.0.
Header

Declared in Winuser.h; include Windows.h and Dbt.h.

Il faut examiner wParam et LParam ( avec des "casts")

Si projet win32 ce message est à traiter dans un switch{} tous les messages.
Si projet MFCil faut rajouter un gestionnaire de message "message handler'