QT程式設計--監聽USB裝置拔出和插入。
阿新 • • 發佈：2019-01-29
第一步過載函式winEvent()，5.6.0版本是nativeEvent(),如下：
bool Dialog_XXX::nativeEvent(const QByteArray &eventType, void *message, long *result) { if (eventType == "windows_generic_MSG") { bool bResult = false; MSG* msg = reinterpret_cast<MSG*>(message); PDEV_BROADCAST_HDR lpdb = (PDEV_BROADCAST_HDR)msg->lParam; if(msg->message == WM_DEVICECHANGE && msg->wParam >= DBT_DEVICEARRIVAL) { switch (msg->wParam) { case DBT_DEVICEARRIVAL: /*TODO*/ bResult = true; break; case DBT_DEVICEREMOVECOMPLETE: /*TODO*/ bResult = true; break; case DBT_DEVNODES_CHANGED: /*TODO*/ bResult = true; break; default: /*TODO*/ bResult = false; break; } } return bResult; } else { return QWidget::nativeEvent(eventType, message, result); } }
第二步，註冊裝置，如果不註冊則檢測不到DBT_DEVICEARRIVAL和DBT_DEVICEREMOVECOMPLETE。
DEV_BROADCAST_DEVICEINTERFACE NotificationFilter; ZeroMemory(&NotificationFilter, sizeof(NotificationFilter)); NotificationFilter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE); NotificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE; // assume we want to be notified with USBSTOR // to get notified with all interface on XP or above // ORed 3rd param with DEVICE_NOTIFY_ALL_INTERFACE_CLASSES and dbcc_classguid will be ignored NotificationFilter.dbcc_classguid = GUID_DEVINTERFACE_USBSTOR; RegisterDeviceNotification((HANDLE)this->winId(), &NotificationFilter, DEVICE_NOTIFY_WINDOW_HANDLE);