关于HID设备与WM_DEVICECHANGE

[kgduwu]

各位,问一个问题,当HID设备如USB鼠标或键盘插上或拔除时,系统向各窗口发送WM_DEVICECHANGE消息所带的wParam,lParam等相关信息,我在程序中试了一下,插入USB鼠标,系统收到4条WM_DEVICECHANGE消息,wParam都显示为0X07,VC中有#define DBT_DEVNODES_CHANGED 0x0007 而拔除USB鼠标系统收到2条WM_DEVICECHANGE消息,wParam都显示为0X07 而插入或拔除U盘时系统除了收到几条WM_DEVICECHANGE消息,wParam都显示为0X07外, 还有分别有wParam显示为0X8000或0x8004 ,VC中#define BT_DEVICEARRIVAL 0x8000,#define DBT_DEVICEREMOVECOMPLETE 0x8004,那请问HID设备如USB鼠标或键盘插上或拔除时WM_DEVICECHANGE消息的wParam有什么规律,有没有熟悉的,指导指导


另我在程式的消息循环中,处理WM_DEVICECHANGE消息,即窗口每收到一个WM_DEVICECHANGE消息,即使用一个消息框把该消息的wParam值显示出来,我的程序运行后,当HID设备如USB鼠标或键盘插上或拔除时,或插入或拔除U盘时收到的消息如上所述收到那些消息,但是我让我的程序一直开着,不插拔任何USB鼠标或键盘或U盘(不插拔任何设备,间隔大概7至8分钟左右,我发现程序中每次还是弹出3个消息框,显示wParam值为0x0007,我看到设备管理器窗口也闪一下,但我试着找是否有相关时而断开,时而连上,而导致窗口收到WM_DEVICECHANGE,基本没发现什么硬件有问题啊,有没有谁知道是咋会事?

[ilovedrv]

直接响应DBT_DEVTYP_DEVICEINTERFACE就可以了，其它可以不用处理

看这个例子，基本上可以直接用

Detecting Hardware Insertion and/or Removal

http://www.codeproject.com/KB/system/HwDetect.aspx

[ilovedrv]

关键的就是两个函数处理

LRESULT CHWDetectDlg::OnMyDeviceChange(WPARAM wParam, LPARAM lParam)
{
	if ( DBT_DEVICEARRIVAL == wParam || DBT_DEVICEREMOVECOMPLETE == wParam ) {
		PDEV_BROADCAST_HDR pHdr = (PDEV_BROADCAST_HDR)lParam;
		PDEV_BROADCAST_DEVICEINTERFACE pDevInf;
		PDEV_BROADCAST_HANDLE pDevHnd;
		PDEV_BROADCAST_OEM pDevOem;
		PDEV_BROADCAST_PORT pDevPort;
		PDEV_BROADCAST_VOLUME pDevVolume;
		switch( pHdr->dbch_devicetype ) {
			case DBT_DEVTYP_DEVICEINTERFACE:
				pDevInf = (PDEV_BROADCAST_DEVICEINTERFACE)pHdr;
				UpdateDevice(pDevInf, wParam);
				break;

			case DBT_DEVTYP_HANDLE:
				pDevHnd = (PDEV_BROADCAST_HANDLE)pHdr;
				break;

			case DBT_DEVTYP_OEM:
				pDevOem = (PDEV_BROADCAST_OEM)pHdr;
				break;

			case DBT_DEVTYP_PORT:
				pDevPort = (PDEV_BROADCAST_PORT)pHdr;
				break;

			case DBT_DEVTYP_VOLUME:
				pDevVolume = (PDEV_BROADCAST_VOLUME)pHdr;
				break;
		}
	}
	return 0;
}

void CHWDetectDlg::UpdateDevice(PDEV_BROADCAST_DEVICEINTERFACE pDevInf, WPARAM wParam)
{
	// pDevInf->dbcc_name: 
	// \\?\USB#Vid_04e8&Pid_503b#0002F9A9828E0F06#{a5dcbf10-6530-11d2-901f-00c04fb951ed}
	// szDevId: USB\Vid_04e8&Pid_503b\0002F9A9828E0F06
	// szClass: USB
	ASSERT(lstrlen(pDevInf->dbcc_name) > 4);
	CString szDevId = pDevInf->dbcc_name+4;
	int idx = szDevId.ReverseFind(_T('#'));
	ASSERT( -1 != idx );
	szDevId.Truncate(idx);
	szDevId.Replace(_T('#'), _T('\\'));
	szDevId.MakeUpper();

	CString szClass;
	idx = szDevId.Find(_T('\\'));
	ASSERT(-1 != idx );
	szClass = szDevId.Left(idx);
	CString szLog;
	m_ctrlEdit.GetWindowText(szLog);
	CString szTmp;
	if ( DBT_DEVICEARRIVAL == wParam ) {
		szTmp.Format(_T("Adding %s\r\n"), szDevId.GetBuffer());
		// TRACE("Adding %s\n", szDevId.GetBuffer());
	} else {
		szTmp.Format(_T("Removing %s\r\n"), szDevId.GetBuffer());
		// TRACE("Removing %s\n", szDevId.GetBuffer());
	}
	szLog.Append(szTmp);
	m_ctrlEdit.SetWindowText(szLog);

	// seems we should ignore "ROOT" type....
	if ( _T("ROOT") == szClass ) {
		return;
	}

	DWORD dwFlag = DBT_DEVICEARRIVAL != wParam ? 
		DIGCF_ALLCLASSES : (DIGCF_ALLCLASSES | DIGCF_PRESENT);
	HDEVINFO hDevInfo = SetupDiGetClassDevs(NULL,szClass,NULL,dwFlag);
	if( INVALID_HANDLE_VALUE == hDevInfo ) {
		AfxMessageBox(CString("SetupDiGetClassDevs(): ") 
			+ _com_error(GetLastError()).ErrorMessage(), MB_ICONEXCLAMATION);
		return;
	}

	SP_DEVINFO_DATA spDevInfoData;
	if ( FindDevice(hDevInfo, szDevId, spDevInfoData) ) {
		// OK, device found
		DWORD DataT ;
		TCHAR buf[MAX_PATH];
		DWORD nSize = 0;

		// get Friendly Name or Device Description
		if ( SetupDiGetDeviceRegistryProperty(hDevInfo, &spDevInfoData, 
			SPDRP_FRIENDLYNAME, &DataT, (PBYTE)buf, sizeof(buf), &nSize) ) {
		} else if ( SetupDiGetDeviceRegistryProperty(hDevInfo, &spDevInfoData, 
			SPDRP_DEVICEDESC, &DataT, (PBYTE)buf, sizeof(buf), &nSize) ) {
		} else {
			lstrcpy(buf, _T("Unknown"));
		}

		HTREEITEM hClass = GetClassItem(&(spDevInfoData.ClassGuid), wParam);
		// hClass can only be NULL for remove device and class node is not found
		if ( NULL == hClass ) return;
		// remove device
		HTREEITEM hChildItem = m_ctrlTree.GetChildItem(hClass);
		BOOL bFound = FALSE;
		while (hChildItem != NULL) {
			CString* pszData = (CString*)m_ctrlTree.GetItemData(hChildItem);
			if ( szDevId == *pszData  ) {
				bFound = TRUE;
				if ( DBT_DEVICEARRIVAL == wParam ) {
					// add device, but seems the device already exists
					break;
				} else {
					// remove device
					delete pszData;
					m_ctrlTree.DeleteItem(hChildItem);
					if ( !m_ctrlTree.ItemHasChildren(hClass) ) {
						HeapFree(GetProcessHeap(), 0, (LPVOID)m_ctrlTree.GetItemData(hClass));
						m_ctrlTree.DeleteItem(hClass);
					}
					break;
				}
			} else {
				hChildItem = m_ctrlTree.GetNextItem(hChildItem, TVGN_NEXT);
			}
		}
		if ( DBT_DEVICEARRIVAL == wParam && !bFound ) {
			// Add device
			int n = GetClassImgIndex(&(spDevInfoData.ClassGuid));
			HTREEITEM hItem = m_ctrlTree.InsertItem(buf, n, n, hClass);
			m_ctrlTree.SetItemData(hItem, (DWORD_PTR)(new CString(szDevId)));
			// set pspDevInfoData to NULL, otherwise it will be HeapFree
			m_ctrlTree.Expand(hClass, TVE_EXPAND);
		}
	}

	SetupDiDestroyDeviceInfoList(hDevInfo);
}

[cnzdgs]

看起来是硬件连接不好，你先把各种USB设备都拔除，看看还会不会收到消息。

[ilovedrv]

/*
* Message = WM_DEVICECHANGE
* wParam = DBT_DEVNODES_CHANGED
* lParam = 0
*
* send when configmg finished a process tree batch. Some devnodes
* may have been added or removed. This is used by ring3 people which
* need to be refreshed whenever any devnode changed occur (like
* device manager). People specific to certain devices should use
* DBT_DEVICE* instead.
*/

#define DBT_DEVNODES_CHANGED 0x0007

是用来刷新节点的，一般不处理

[s669pengwei]

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[cqxc413]

look one look

[投投]

ssssss

[iwillbeback008]

look one look

[erlangshens2012]

我想通过获取USB鼠标返回的数据来算出鼠标移动的速度，可以实现么？有源代码么~~~谢谢！

[zhongjj2008]

需要注册设备 RegisterDeviceNotification