charsampledevice.cpp

《windows驱动开发程序XP》（武安河）的驱动开发书籍源代码

// CharSampleDevice.cpp
// Implementation of CharSampleDevice device class
//
// Generated by DriverWizard version DriverStudio 2.6.0 (Build 336)
// Requires Compuware's DriverWorks classes
//

#pragma warning(disable:4065) // Allow switch statement with no cases
		  
#include <vdw.h>
#include "..\CharSampleDeviceinterface.h"

#include "CharSample.h"
#include "CharSampleDevice.h"
#include "..\CharSampleioctl.h"

#pragma hdrstop("CharSample.pch")


GUID CharSampleDevice_Guid = CharSampleDevice_CLASS_GUID;

extern KTrace T;			// Global driver trace object	
////////////////////////////////////////////////////////////////////////
//  CharSampleDevice::CharSampleDevice
//
//	Routine Description:
//		This is the constructor for the Functional Device Object, or FDO.
//		It is derived from KPnpDevice, which builds in automatic
//	    dispatching of subfunctions of IRP_MJ_POWER and IRP_MJ_PNP to
//		virtual member functions.
//
//	Parameters:
//		Pdo - Physical Device Object - this is a pointer to a system
//			device object that represents the physical device.
//
//		Unit - Unit number. This is a number to append to the device's
//			base device name to form the Logical Device Object's name
//
//	Return Value:
//		None   
//
//	Comments:
//		The object being constructed contains a data member (m_Lower) of type
//		KPnpLowerDevice. By initializing it, the driver binds the FDO to the
//		PDO and creates an interface to the upper edge of the system class driver.
//

CharSampleDevice::CharSampleDevice(PDEVICE_OBJECT Pdo, ULONG Unit) :
	KPnpDevice(Pdo, &CharSampleDevice_Guid)
{

	// Check constructor status
    if ( ! NT_SUCCESS(m_ConstructorStatus) )
	{
	    return;
	}

	// Remember our unit number
	m_Unit = Unit;

	// Initialize the lower device
	m_Lower.Initialize(this, Pdo);

    // Inform the base class of the lower edge device object
	SetLowerDevice(&m_Lower);

	// Initialize the PnP Policy settings to the "standard" policy
	SetPnpPolicy();

// TODO:	Customize the PnP Policy for this device by setting
//			flags in m_Policies.

}

CharSampleDevice::~CharSampleDevice()
{
}

NTSTATUS CharSampleDevice::DefaultPnp(KIrp I) 
{
	I.ForceReuseOfCurrentStackLocationInCalldown();
	return m_Lower.PnpCall(this, I);
}

NTSTATUS CharSampleDevice::DefaultPower(KIrp I) 
{
	I.IndicatePowerIrpProcessed();
	I.CopyParametersDown();
	return m_Lower.PnpPowerCall(this, I);
}

NTSTATUS CharSampleDevice::SystemControl(KIrp I) 
{
	I.ForceReuseOfCurrentStackLocationInCalldown();
	return m_Lower.PnpCall(this, I);
}

NTSTATUS CharSampleDevice::OnStartDevice(KIrp I)
{
	return STATUS_SUCCESS;
}

NTSTATUS CharSampleDevice::OnStopDevice(KIrp I)
{
	return STATUS_SUCCESS;
}

NTSTATUS CharSampleDevice::OnRemoveDevice(KIrp I)
{
	return STATUS_SUCCESS;
}

NTSTATUS CharSampleDevice::Create(KIrp I)
{
	return I.PnpComplete(this, STATUS_SUCCESS, IO_NO_INCREMENT);
}

NTSTATUS CharSampleDevice::Close(KIrp I)
{
	return I.PnpComplete(this, STATUS_SUCCESS, IO_NO_INCREMENT);
}

NTSTATUS CharSampleDevice::DeviceControl(KIrp I) 
{
	NTSTATUS status;
	CHAR n,c[]="零一二三四五六七八九";

	T << "CharSampleDevice::DeviceControl\n";
	
	switch (I.IoctlCode())
	{
		case CHARSAMPLE_IOCTL_800:
			n=*(CHAR *)I.IoctlBuffer();
			if ((n >= '0') && (n <= '9'))
			{
				n -= '0';
				strncpy((PCHAR)I.IoctlBuffer(),&c[n*2],2);
				I.Information() = 2;
				status = STATUS_SUCCESS;
			}
			else
				status = STATUS_INVALID_PARAMETER;
			break;

		default:
			// Unrecognized IOCTL request
			status = STATUS_INVALID_PARAMETER;
			break;
	}

	return I.PnpComplete(this, status);
}