USB Device Change Notification
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From: Sushma on 12 Oct 2006 09:36 Hello All, I am working on WIN 32 Application which gets USB device arrival/removal notification. I used WM_DEVICECHANGE message in WndProc() function. I implemented the DoRegisterDeviceInterface() function when device is opened using CreateFile(): BOOL DoRegisterDeviceInterface( HDEVNOTIFY *hDevNotify ) { DEV_BROADCAST_HANDLE NotificationFilter; DWORD Err; TCHAR msg[MAX_PATH]; ZeroMemory( &NotificationFilter, sizeof(NotificationFilter) ); NotificationFilter.dbch_size = sizeof(DEV_BROADCAST_HANDLE); NotificationFilter.dbch_devicetype = DBT_DEVTYP_HANDLE; NotificationFilter.dbch_handle = hDevice; // Register handle based notification to receive pnp // device change notification on the handle. *hDevNotify = RegisterDeviceNotification( m_hWnd, &NotificationFilter, DEVICE_NOTIFY_WINDOW_HANDLE ); if(!*hDevNotify) { Err = GetLastError(); _stprintf(msg, "RegisterDeviceNotification failed: %lx.\n", Err); MessageBox(0, msg, 0, 0); return FALSE; } return TRUE; } WndProc(...) { case DEVICECHANGE: { if((wParam & 0xC000) == 0x8000) { if (pBroadcasthdr->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE) { HandleDeviceInterfaceChange(hWnd, nEventType); } else if (pBroadcasthdr->dbch_devicetype == DBT_DEVTYP_HANDLE) { HandleDeviceChange(hWnd, nEventType); } } break; } } The wparam is always 0x0007, which notifies of DBT_DEVNODES_CHANGED event only. i never get DBT_DEVICEARRIVAL or DBT_DEVICEREMOVECOMPLETE notification. I get the correct notification of Device Arrival and Removal when a CD is placed or removed in CDROM drive but not for USB device. Suggest me if im going wrong in my code. Thank You, Regards, Sushma
From: Philipp Ineichen on 12 Oct 2006 11:12 Hi The following RegisterDeviceNotification function works perfect for me. I mean I get all Arrival and Removal message for all INPUT devices. I test it with my Logitech mouse. BOOL RegisterForDevChange(HWND hDlg, PVOID *hNotifyDevNode) { BOOL bRet; DEV_BROADCAST_DEVICEINTERFACE *pFilterData = new (DEV_BROADCAST_DEVICEINTERFACE); ZeroMemory(pFilterData, sizeof(DEV_BROADCAST_DEVICEINTERFACE)); pFilterData->dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE); pFilterData->dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE; pFilterData->dbcc_classguid = GUID_CLASS_INPUT; *hNotifyDevNode = RegisterDeviceNotification(hDlg, pFilterData, DEVICE_NOTIFY_WINDOW_HANDLE); if(*hNotifyDevNode) { bRet = TRUE; } else { if (pFilterData) delete (pFilterData); bRet = FALSE; } return bRet; } LRESULT CALLBACK MainDlgProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam) { : : : case WM_DEVICECHANGE: switch ((UINT)wParam) { case DBT_DEVICEARRIVAL: SendMessage(hOutputBox, LB_ADDSTRING, 0, (LPARAM)"Device Arrival"); break; case DBT_DEVICEQUERYREMOVE: SendMessage(hOutputBox, LB_ADDSTRING, 0, (LPARAM)"Device Query Remove"); break; case DBT_DEVICEREMOVECOMPLETE: SendMessage(hOutputBox, LB_ADDSTRING, 0, (LPARAM)"Device Remove Complete"); break; } break; : : : } - PI -------------------- Philipp Ineichen www.skagitsystems.ch
From: Sushma on 13 Oct 2006 03:13 Hi Philipp, Thanks for your code. It works now but only question i have now is i get the arrival/removal notification for my device and the control enters into DBT_DEVICEARRIVAL and DBT_DEVICEREMOVECOMPLETE statements also, but it happens to enter more than once when i plugin or remove the device. To verify this i put a debug out put message in these statements, the debug message appears more than once. Could you tell me why this is happening? Do i need to handle anything else in my code? Thank You. Regards, Sushma Philipp Ineichen wrote: > Hi > > The following RegisterDeviceNotification function works perfect for me. I > mean I get all Arrival and Removal message for all INPUT devices. I test > it with my Logitech mouse. > > BOOL RegisterForDevChange(HWND hDlg, PVOID *hNotifyDevNode) > { > BOOL bRet; > > DEV_BROADCAST_DEVICEINTERFACE *pFilterData = new > (DEV_BROADCAST_DEVICEINTERFACE); > > ZeroMemory(pFilterData, sizeof(DEV_BROADCAST_DEVICEINTERFACE)); > > pFilterData->dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE); > pFilterData->dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE; > pFilterData->dbcc_classguid = GUID_CLASS_INPUT; > > *hNotifyDevNode = RegisterDeviceNotification(hDlg, pFilterData, > DEVICE_NOTIFY_WINDOW_HANDLE); > > if(*hNotifyDevNode) > { > bRet = TRUE; > } > else > { > if (pFilterData) > delete (pFilterData); > > bRet = FALSE; > } > > return bRet; > } > > > LRESULT CALLBACK MainDlgProc(HWND hDlg, UINT message, WPARAM wParam, > LPARAM lParam) > { > > : > : > : > > case WM_DEVICECHANGE: > > switch ((UINT)wParam) > { > case DBT_DEVICEARRIVAL: > SendMessage(hOutputBox, LB_ADDSTRING, 0, (LPARAM)"Device Arrival"); > break; > > case DBT_DEVICEQUERYREMOVE: > SendMessage(hOutputBox, LB_ADDSTRING, 0, (LPARAM)"Device Query > Remove"); > break; > > case DBT_DEVICEREMOVECOMPLETE: > SendMessage(hOutputBox, LB_ADDSTRING, 0, (LPARAM)"Device Remove > Complete"); > break; > } > break; > > : > : > : > } > > - PI > -------------------- > Philipp Ineichen > www.skagitsystems.ch
From: hs2 on 13 Oct 2006 05:04 Sushma wrote: > Hi Philipp, > > Thanks for your code. It works now but only question i have now is i > get the arrival/removal notification for my device and the control > enters into DBT_DEVICEARRIVAL and DBT_DEVICEREMOVECOMPLETE statements > also, but it happens to enter more than once when i plugin or remove > the device. > > To verify this i put a debug out put message in these statements, the > debug message appears more than once. > > Could you tell me why this is happening? Do i need to handle anything > else in my code? > > Thank You. > > Regards, > Sushma > > Philipp Ineichen wrote: >> Hi >> >> The following RegisterDeviceNotification function works perfect for me. I >> mean I get all Arrival and Removal message for all INPUT devices. I test >> it with my Logitech mouse. >> >> BOOL RegisterForDevChange(HWND hDlg, PVOID *hNotifyDevNode) >> { >> BOOL bRet; >> >> DEV_BROADCAST_DEVICEINTERFACE *pFilterData = new >> (DEV_BROADCAST_DEVICEINTERFACE); >> >> ZeroMemory(pFilterData, sizeof(DEV_BROADCAST_DEVICEINTERFACE)); >> >> pFilterData->dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE); >> pFilterData->dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE; >> pFilterData->dbcc_classguid = GUID_CLASS_INPUT; >> >> *hNotifyDevNode = RegisterDeviceNotification(hDlg, pFilterData, >> DEVICE_NOTIFY_WINDOW_HANDLE); >> >> if(*hNotifyDevNode) >> { >> bRet = TRUE; >> } >> else >> { >> if (pFilterData) >> delete (pFilterData); >> >> bRet = FALSE; >> } >> >> return bRet; >> } >> >> >> LRESULT CALLBACK MainDlgProc(HWND hDlg, UINT message, WPARAM wParam, >> LPARAM lParam) >> { >> >> : >> : >> : >> >> case WM_DEVICECHANGE: >> >> switch ((UINT)wParam) >> { >> case DBT_DEVICEARRIVAL: >> SendMessage(hOutputBox, LB_ADDSTRING, 0, (LPARAM)"Device Arrival"); >> break; >> >> case DBT_DEVICEQUERYREMOVE: >> SendMessage(hOutputBox, LB_ADDSTRING, 0, (LPARAM)"Device Query >> Remove"); >> break; >> >> case DBT_DEVICEREMOVECOMPLETE: >> SendMessage(hOutputBox, LB_ADDSTRING, 0, (LPARAM)"Device Remove >> Complete"); >> break; >> } >> break; >> >> : >> : >> : >> } >> >> - PI >> -------------------- >> Philipp Ineichen >> www.skagitsystems.ch > Check (DEV_BROADCAST_DEVICEINTERFACE*)lParam)->dbcc_name in e.g. MainDlgProc Provides the name of the device related to the message. HS2
From: Nyamagoud on 13 Oct 2006 07:21
Hi, You should refer to the lparam member of the WindowProc. It points to DEV_BROADCAST_HDR structure, then check its dbch_devicetype member to determine the device type. This way you can handle the request which you are interested in and ignore the other. r they same in both the case? "Sushma" wrote: > Hi Philipp, > > Thanks for your code. It works now but only question i have now is i > get the arrival/removal notification for my device and the control > enters into DBT_DEVICEARRIVAL and DBT_DEVICEREMOVECOMPLETE statements > also, but it happens to enter more than once when i plugin or remove > the device. > > To verify this i put a debug out put message in these statements, the > debug message appears more than once. > > Could you tell me why this is happening? Do i need to handle anything > else in my code? > > Thank You. > > Regards, > Sushma > > Philipp Ineichen wrote: > > Hi > > > > The following RegisterDeviceNotification function works perfect for me. I > > mean I get all Arrival and Removal message for all INPUT devices. I test > > it with my Logitech mouse. > > > > BOOL RegisterForDevChange(HWND hDlg, PVOID *hNotifyDevNode) > > { > > BOOL bRet; > > > > DEV_BROADCAST_DEVICEINTERFACE *pFilterData = new > > (DEV_BROADCAST_DEVICEINTERFACE); > > > > ZeroMemory(pFilterData, sizeof(DEV_BROADCAST_DEVICEINTERFACE)); > > > > pFilterData->dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE); > > pFilterData->dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE; > > pFilterData->dbcc_classguid = GUID_CLASS_INPUT; > > > > *hNotifyDevNode = RegisterDeviceNotification(hDlg, pFilterData, > > DEVICE_NOTIFY_WINDOW_HANDLE); > > > > if(*hNotifyDevNode) > > { > > bRet = TRUE; > > } > > else > > { > > if (pFilterData) > > delete (pFilterData); > > > > bRet = FALSE; > > } > > > > return bRet; > > } > > > > > > LRESULT CALLBACK MainDlgProc(HWND hDlg, UINT message, WPARAM wParam, > > LPARAM lParam) > > { > > > > : > > : > > : > > > > case WM_DEVICECHANGE: > > > > switch ((UINT)wParam) > > { > > case DBT_DEVICEARRIVAL: > > SendMessage(hOutputBox, LB_ADDSTRING, 0, (LPARAM)"Device Arrival"); > > break; > > > > case DBT_DEVICEQUERYREMOVE: > > SendMessage(hOutputBox, LB_ADDSTRING, 0, (LPARAM)"Device Query > > Remove"); > > break; > > > > case DBT_DEVICEREMOVECOMPLETE: > > SendMessage(hOutputBox, LB_ADDSTRING, 0, (LPARAM)"Device Remove > > Complete"); > > break; > > } > > break; > > > > : > > : > > : > > } > > > > - PI > > -------------------- > > Philipp Ineichen > > www.skagitsystems.ch > > |