#define DONG_NT_DEVICE_NAME L"\\Device\\DongLpt"#define DONG_NT_PORT_DEVICE_NAME L"\\Device\\ParallelPort"#define DONG_WIN32_DEVICE_NAME L"\\DosDevices\\DongLpt"#define DONG_DOS_DEVICES L"\\DosDevices\\"#define DONG_DRIVER_NAME L"DongLpt" #define DONG_MAX_NAME_LENGTH 50  NTSTATUSDriverEntry(IN PDRIVER_OBJECT pDriverObject,IN PUNICODE_STRING pRegistryPath){
      ULONG NtDeviceNumber, NumParallelPorts;NTSTATUS status = STATUS_SUCCESS; DongInitializeEventLog(pDriverObject); // Export other driver entry points...pDriverObject->DriverUnload = DongDriverUnload; pDriverObject->MajorFunction[ IRP_MJ_CREATE ] = DongDispatchOpen;pDriverObject->MajorFunction[ IRP_MJ_CLOSE ] = DongDispatchClose;pDriverObject->MajorFunction[ IRP_MJ_WRITE ] = DongDispatchWrite;pDriverObject->MajorFunction[ IRP_MJ_READ ] = DongDispatchRead;pDriverObject->MajorFunction[ IRP_MJ_CLEANUP ] = DongDispatchCleanup; // Initialize a Device object for each parallel portNumParallelPorts = IoGetConfigurationInformation()->ParallelCount; for( NtDeviceNumber=0; NtDeviceNumber
       
        Flags |= DO_BUFFERED_IO; /// Initialize the Device Extension pDevExt = pDevObj->DeviceExtension;RtlZeroMemory(pDevExt, sizeof(DEVICE_EXTENSION)); pDevExt->DeviceObject = pDevObj;pDevExt->NtDeviceNumber = NtDeviceNumber; /// Attach to parport deviceportName.Length = 0;   RtlAppendUnicodeToString( &portName, DONG_NT_PORT_DEVICE_NAME);number.Length = 0;RtlIntegerToUnicodeString( NtDeviceNumber, 10, &number);RtlAppendUnicodeStringToString( &portName, &number); status = IoGetDeviceObjectPointer(&portName, FILE_READ_ATTRIBUTES,&pFileObject,&pDevExt->PortDeviceObject);if (!NT_SUCCESS(status)){
      IoDeleteDevice(pDevObj);DongReportUnexpectedFailure(DONG_ERRORLOG_INIT,DONG_INIT_IoGetDeviceObjectPointer);return status;} ObReferenceObjectByPointer( pDevExt->PortDeviceObject,FILE_READ_ATTRIBUTES,NULL,KernelMode);ObDereferenceObject(pFileObject); pDevExt->DeviceObject->StackSize = pDevExt->PortDeviceObject->StackSize + 1; // Get the port information from the port device object.status = DongGetPortInfoFromPortDevice(pDevExt);if (!NT_SUCCESS(status)){
      IoDeleteDevice(pDevObj);return status;} /   // Form the Win32 symbolic link name. linkName.Length = 0;RtlAppendUnicodeToString( &linkName, DONG_WIN32_DEVICE_NAME);number.Length = 0;RtlIntegerToUnicodeString( NtDeviceNumber + 1, 10, &number);RtlAppendUnicodeStringToString( &linkName, &number); // Create a symbolic link so our device is visible to Win32...status = IoCreateSymbolicLink( &linkName, &deviceName);if( !NT_SUCCESS(status)){
      IoDeleteDevice( pDevObj );DongReportUnexpectedFailure(DONG_ERRORLOG_INIT,DONG_INIT_IoCreateSymbolicLink);return status;} return status;} static NTSTATUSDongGetPortInfoFromPortDevice(IN OUT  PDEVICE_EXTENSION   pDevExt){
      KEVENT                      event;PIRP                        irp;PARALLEL_PORT_INFORMATION   portInfo;IO_STATUS_BLOCK             ioStatus;NTSTATUS                    status; /// Get parallel port information KeInitializeEvent(&event, NotificationEvent, FALSE); irp = IoBuildDeviceIoControlRequest(IOCTL_INTERNAL_GET_PARALLEL_PORT_INFO,pDevExt->PortDeviceObject,NULL, 0, &portInfo,sizeof(PARALLEL_PORT_INFORMATION),TRUE, &event, &ioStatus); if (!irp){
      DongReportUnexpectedFailure(DONG_ERRORLOG_INIT,DONG_INIT_IoBuildDeviceIoControlRequest);return STATUS_INSUFFICIENT_RESOURCES;} status = IoCallDriver(pDevExt->PortDeviceObject, irp); if (!NT_SUCCESS(status)){
      DongReportUnexpectedFailure(DONG_ERRORLOG_INIT,DONG_INIT_IoCallDriver);return status;} status = KeWaitForSingleObject(&event, Executive, KernelMode, FALSE, NULL); if (!NT_SUCCESS(status)){
      DongReportUnexpectedFailure(DONG_ERRORLOG_INIT,DONG_INIT_KeWaitForSingleObject);return status;} pDevExt->OriginalController = portInfo.OriginalController;pDevExt->Controller = portInfo.Controller;pDevExt->SpanOfController = portInfo.SpanOfController;pDevExt->FreePort = portInfo.FreePort;pDevExt->TryAllocatePort = portInfo.TryAllocatePort;pDevExt->PortContext = portInfo.Context; // Check register spanif (pDevExt->SpanOfController < DONG_REGISTER_SPAN){
      DongReportUnexpectedFailure(DONG_ERRORLOG_INIT,DONG_INIT_RegisterSpan);return STATUS_INSUFFICIENT_RESOURCES;} return STATUS_SUCCESS;}