????? 在一些項目中，系統需要實時監測U盤或SD卡的插入拔出。當文件系統加載成功后通知特定應用程序，啟動自動播放功能。在U盤或其他外部存儲設備移除時，也需要立即通知相應的程序，停止訪問這些設備，如播放其中的音視頻文件，以免程序出錯。

????? 我們可以使用WinCE設備管理器提供的Device Interface Notification來實現這個功能，參考代碼如下。

DWORD?WINAPI?ThreadFun(LPVOID?lpParameter)
{
????HANDLE?ph[MAXIMUM_WAIT_OBJECTS];
????HANDLE?phMsgQueue[MAXIMUM_WAIT_OBJECTS-1];
????HANDLE?phDevNotif[MAXIMUM_WAIT_OBJECTS-1];
????MSGQUEUEOPTIONS?msgopts;
????GUID?guid[]?=?{BLOCK_DRIVER_GUID,?FSD_MOUNT_GUID};
????DWORD?dwCount;
????BYTE?pDevBuf[sizeof(DEVDETAIL)?+?MAX_DEVCLASS_NAMELEN?*?sizeof(TCHAR)]?=?{0};
????DEVDETAIL?*pd?=?(DEVDETAIL*)pDevBuf;

????ghExitThread?=?CreateEvent(NULL,?FALSE,?FALSE,?NULL);

????ph[0]?=?ghExitThread;
????dwCount?=?sizeof(guid)/sizeof(GUID);
????for?(DWORD?i?=?0;?i?<?dwCount;?i++)
????{
????????memset(&msgopts,?0,?sizeof(msgopts));
????????msgopts.dwFlags?=?0;
????????msgopts.dwSize?=?sizeof(msgopts);
????????msgopts.dwMaxMessages?=?0;?
????????msgopts.cbMaxMessage?=?sizeof(pDevBuf);
????????msgopts.bReadAccess?=?TRUE;

????????phMsgQueue[i]?=?CreateMsgQueue(NULL,?&msgopts);
????????phDevNotif[i]?=?RequestDeviceNotifications(guid+i,?phMsgQueue[i],?TRUE);
????????
????????ph[i+1]?=?phMsgQueue[i];
????}

????while?(1)
????{
????????DWORD?dwSize;
????????DWORD?dwFlags;
????????DWORD?dwWait;
????????DWORD?dwQueue;
????
????????dwWait?=?WaitForMultipleObjects(dwCount?+?1,?ph,?FALSE,?INFINITE);
????????if?((dwWait?<=?WAIT_OBJECT_0)?||?(dwWait?>=?(WAIT_OBJECT_0?+?dwCount?+?1)))?
????????{
????????????break;
????????}

????????dwQueue?=?(dwWait?-?WAIT_OBJECT_0)?-?1;
????????
????????while(ReadMsgQueue(phMsgQueue[dwQueue],?pd,?sizeof(pDevBuf),?&dwSize,?1,?&dwFlags))?
????????{
????????????if?(GUID_ISEQUAL(pd->guidDevClass,?BLOCK_DRIVER_GUID))
????????????{
????????????????printf("\r\nDEV:%S?%s",?pd->szName,?pd->fAttached???"Add!"?:?"Removed!");
????????????????if?(pd->fAttached)
????????????????{
????????????????????Sleep(10);
????????????????????printf("\r\nOpenStore!");
????????????????????HANDLE?h?=?OpenStore(pd->szName);
????????????????????STOREINFO?si;
????????????????????memset(&si,?0?,?sizeof(si));
????????????????????si.cbSize?=?sizeof(si);
????????????????????printf("\r\nGetStoreInfo!");
????????????????????GetStoreInfo(h,?&si);
????????????????????printf("\r\n%S?%x",?si.szStoreName,?si.dwDeviceType);
????????????????????CloseHandle(h);
????????????????}
????????????}
????????????else?if(GUID_ISEQUAL(pd->guidDevClass,?FSD_MOUNT_GUID))
????????????{
????????????????printf("\r\nFSD:%S?%s",?pd->szName,?pd->fAttached???"Add!"?:?"Removed!");
????????????}
????????????Sleep(1);
????????}????????
????}
????
????for?(DWORD?i?=?0;?i?<?dwCount;?i++)?
????{
????????StopDeviceNotifications(phDevNotif[i]);
????????CloseMsgQueue(phMsgQueue[i]);
????}????
????CloseHandle(ghExitThread);

????return?0;
}

轉載于:https://www.cnblogs.com/we-hjb/archive/2011/06/28/2092779.html

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