WM_DEVICECHANGE not working in Vista

[Anarchi]

I use WM_DEVICECHANGE to detect when a USB Key is inserted or removed.

BOOL PreTranslateMessage(MSG* pMsg)
{

	// USB key plugged/unplugged?
	if((pMsg->message == WM_DEVICECHANGE) || (pMsg->message == DBT_DEVNODES_CHANGED))
	{
		// Refresh
		EnumerateDrives();
    }

}

This works perfectly in Windows XP, but doesn't work in Vista.

So I did a lot of googling and codeguruing, and decided I needed to add:

// <Usbiodef.h> doesn't exist in VS2005, so define my own
static /*const*/ GUID GUID_DEVINTERFACE_USB_DEVICE = { 0xA5DCBF10L, 0x6530, 0x11D2, { 0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED } }; // 


	DEV_BROADCAST_DEVICEINTERFACE NotificationFilter;
    ZeroMemory(&NotificationFilter, sizeof(NotificationFilter));

    NotificationFilter.dbcc_size = sizeof(NotificationFilter);
    NotificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
    NotificationFilter.dbcc_reserved = 0;
    NotificationFilter.dbcc_classguid = GUID_DEVINTERFACE_USB_DEVICE; 

	HDEVNOTIFY hDevNotify = RegisterDeviceNotification(this->m_hWnd, &NotificationFilter, DEVICE_NOTIFY_SERVICE_HANDLE);

But it still wont detect when a USB key is added in Vista (it still works in XP)

What am I doing wrong?

[cilu]

Maybe this can help: http://blogs.msdn.com/winsdk/archive...ows-vista.aspx.

[Anarchi]

Hi, thanks for the info.

I added RegisterDeviceNotification() exactly like in that article, but I still dont receive WM_DEVICECHANGE

The RegisterDeviceNotification() function was successful, I disabled my Antivirus and firewall, still nothing.

[Anarchi]

This is driving me nuts lol

I downloaded the HWDetect article sample from here: http://www.codeproject.com/KB/system/HwDetect.aspx
I recompiled the source in Visual Studio 2005 SP1 (because the binary downloaded gave an MFC7 dll error), and it works perfectly! I plug in my USB key and HWDetect displays the device.

So I thought... if I copy that code in my own app, it should work! No - it still doesnt work.
Then I created a fresh new VS2005 MFC Dialog App, and copied the code from HWDetectDlg.cpp/h... it still doesn't work!



Here is the code of my new MFC App:

My Header File

#include <Dbt.h>
#include <setupapi.h>

static const GUID GUID_DEVINTERFACE_LIST[] = 
{
	// GUID_DEVINTERFACE_USB_DEVICE
	{ 0xA5DCBF10, 0x6530, 0x11D2, { 0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED } },

	// GUID_DEVINTERFACE_DISK
	{ 0x53f56307, 0xb6bf, 0x11d0, { 0x94, 0xf2, 0x00, 0xa0, 0xc9, 0x1e, 0xfb, 0x8b } },

	// GUID_DEVINTERFACE_HID, 
	{ 0x4D1E55B2, 0xF16F, 0x11CF, { 0x88, 0xCB, 0x00, 0x11, 0x11, 0x00, 0x00, 0x30 } },
			 
	// GUID_NDIS_LAN_CLASS
	{ 0xad498944, 0x762f, 0x11d0, { 0x8d, 0xcb, 0x00, 0xc0, 0x4f, 0xc3, 0x35, 0x8c } }

	//// GUID_DEVINTERFACE_COMPORT
	//{ 0x86e0d1e0, 0x8089, 0x11d0, { 0x9c, 0xe4, 0x08, 0x00, 0x3e, 0x30, 0x1f, 0x73 } },

	//// GUID_DEVINTERFACE_SERENUM_BUS_ENUMERATOR
	//{ 0x4D36E978, 0xE325, 0x11CE, { 0xBF, 0xC1, 0x08, 0x00, 0x2B, 0xE1, 0x03, 0x18 } },

	//// GUID_DEVINTERFACE_PARALLEL
	//{ 0x97F76EF0, 0xF883, 0x11D0, { 0xAF, 0x1F, 0x00, 0x00, 0xF8, 0x00, 0x84, 0x5C } },

	//// GUID_DEVINTERFACE_PARCLASS
	//{ 0x811FC6A5, 0xF728, 0x11D0, { 0xA5, 0x37, 0x00, 0x00, 0xF8, 0x75, 0x3E, 0xD1 } }
};

My Source File (OnInitDialog):

	HDEVNOTIFY hDevNotify;
    DEV_BROADCAST_DEVICEINTERFACE NotificationFilter;
    ZeroMemory( &NotificationFilter, sizeof(NotificationFilter) );
    NotificationFilter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
    NotificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
	for(int i=0; i<sizeof(GUID_DEVINTERFACE_LIST)/sizeof(GUID); i++) 
	{
		NotificationFilter.dbcc_classguid = GUID_DEVINTERFACE_LIST[i];
		hDevNotify = RegisterDeviceNotification(this->GetSafeHwnd(), &NotificationFilter, DEVICE_NOTIFY_WINDOW_HANDLE);
		if( !hDevNotify ) 
		{
			AfxMessageBox(CString("Can't register device notification ") , MB_ICONEXCLAMATION);
			return FALSE;
		}
	}

I added PreTranslateMsg:

BOOL CWM_DEVDlg::PreTranslateMessage(MSG* pMsg)
{
	if(pMsg->message == WM_DEVICECHANGE)
	{
		AfxMessageBox("***** WM_DEVICECHANGE *****");
	}

	return CDialog::PreTranslateMessage(pMsg);
}

The RegisterDeviceNotification() function is successful, but my App simply doesn't receive WM_DEVICECHANGE. (It receives all other normal messages, so PreTranslateMessage is working)

I am absolutely clueless why it doesn't work

Can I upload my MFC app somewhere so you can have a look?

(I am using Windows 7 Pro)

[Anarchi]

Finally got it working!

PreTranslateMessage was not receiving WM_DEVICECHANGE (but all other messages appear to work fine).

I noticed HWDetect wasn't using PreTranslateMessage, so I used the ON_MESSAGE technique instead.

cpp..
BEGIN_MESSAGE_MAP
 ON_MESSAGE(WM_DEVICECHANGE, OnMyDeviceChange)

h..
afx_msg LRESULT OnMyDeviceChange(WPARAM wParam, LPARAM lParam);

WM_DEVICECHANGE in PreTranslateMessage works in XP, why not in Win7?