driver.cpp

windows驱动开发详解光盘资料

/************************************************************************
* 文件名称:Driver.cpp                                                 
* 作    者:张帆
* 完成日期:2007-11-1
*************************************************************************/

#include "Driver.h"

#pragma INITCODE
VOID ProbeTest()
{
	PVOID badPointer = NULL;

	KdPrint(("Enter ProbeTest\n"));

	__try
	{
		KdPrint(("Enter __try block\n"));

		//判断空指针是否可读，显然会导致异常
		ProbeForWrite(badPointer,100,4);

		//由于在上面引发异常，所以以后语句不会被执行!
		KdPrint(("Leave __try block\n"));
	}
	__except(EXCEPTION_EXECUTE_HANDLER)
	{
		KdPrint(("Catch the exception\n"));
		KdPrint(("The program will keep going\n"));
	}

	//该语句会被执行
	KdPrint(("Leave ProbeTest\n"));
}

NTSTATUS Foo(PCHAR* str)
{
	ASSERT(str!=NULL);//断言
	//对str的操作
}


NTSTATUS Foo(PCHAR* str)
{
	if (str==NULL)
	{
		return STATUS_INVALID_VARIANT;
	}
	//对str的操作
}


#pragma INITCODE
NTSTATUS TryFinallyTest()
{
	NTSTATUS status = STATUS_SUCCESS;
	__try
	{
		//做一些事情
		return STATUS_SUCCESS;
	}
	__finally
	{
		KdPrint(("Enter finallly block\n"));
		return status;
	}
}

/************************************************************************
* 函数名称:DriverEntry
* 功能描述:初始化驱动程序，定位和申请硬件资源，创建内核对象
* 参数列表:
      pDriverObject:从I/O管理器中传进来的驱动对象
      pRegistryPath:驱动程序在注册表的中的路径
* 返回 值:返回初始化驱动状态
*************************************************************************/
#pragma INITCODE
extern "C" NTSTATUS DriverEntry (
			IN PDRIVER_OBJECT pDriverObject,
			IN PUNICODE_STRING pRegistryPath	) 
{
	NTSTATUS status;
	KdPrint(("Enter DriverEntry\n"));

	//注册其他驱动调用函数入口
	pDriverObject->DriverUnload = HelloDDKUnload;
	pDriverObject->MajorFunction[IRP_MJ_CREATE] = HelloDDKDispatchRoutine;
	pDriverObject->MajorFunction[IRP_MJ_CLOSE] = HelloDDKDispatchRoutine;
	pDriverObject->MajorFunction[IRP_MJ_WRITE] = HelloDDKDispatchRoutine;
	pDriverObject->MajorFunction[IRP_MJ_READ] = HelloDDKDispatchRoutine;
	
	//创建驱动设备对象
	status = CreateDevice(pDriverObject);

	ProbeTest();

	TryFinallyTest();

	KdPrint(("DriverEntry end\n"));
	return status;
}

/************************************************************************
* 函数名称:CreateDevice
* 功能描述:初始化设备对象
* 参数列表:
      pDriverObject:从I/O管理器中传进来的驱动对象
* 返回 值:返回初始化状态
*************************************************************************/
#pragma INITCODE
NTSTATUS CreateDevice (
		IN PDRIVER_OBJECT	pDriverObject) 
{
	NTSTATUS status;
	PDEVICE_OBJECT pDevObj;
	PDEVICE_EXTENSION pDevExt;
	
	//创建设备名称
	UNICODE_STRING devName;
	RtlInitUnicodeString(&devName,L"\\Device\\MyDDKDevice");
	
	//创建设备
	status = IoCreateDevice( pDriverObject,
						sizeof(DEVICE_EXTENSION),
						&(UNICODE_STRING)devName,
						FILE_DEVICE_UNKNOWN,
						0, TRUE,
						&pDevObj );
	if (!NT_SUCCESS(status))
		return status;

	pDevObj->Flags |= DO_BUFFERED_IO;
	pDevExt = (PDEVICE_EXTENSION)pDevObj->DeviceExtension;
	pDevExt->pDevice = pDevObj;
	pDevExt->ustrDeviceName = devName;
	//创建符号链接
	UNICODE_STRING symLinkName;
	RtlInitUnicodeString(&symLinkName,L"\\??\\HelloDDK");
	pDevExt->ustrSymLinkName = symLinkName;
	status = IoCreateSymbolicLink( &symLinkName,&devName );
	if (!NT_SUCCESS(status)) 
	{
		IoDeleteDevice( pDevObj );
		return status;
	}
	return STATUS_SUCCESS;
}

/************************************************************************
* 函数名称:HelloDDKUnload
* 功能描述:负责驱动程序的卸载操作
* 参数列表:
      pDriverObject:驱动对象
* 返回 值:返回状态
*************************************************************************/
#pragma PAGEDCODE
VOID HelloDDKUnload (IN PDRIVER_OBJECT pDriverObject) 
{
	PDEVICE_OBJECT	pNextObj;
	KdPrint(("Enter DriverUnload\n"));
	pNextObj = pDriverObject->DeviceObject;
	while (pNextObj != NULL) 
	{
		PDEVICE_EXTENSION pDevExt = (PDEVICE_EXTENSION)
			pNextObj->DeviceExtension;

		//删除符号链接
		UNICODE_STRING pLinkName = pDevExt->ustrSymLinkName;
		IoDeleteSymbolicLink(&pLinkName);
		pNextObj = pNextObj->NextDevice;
		IoDeleteDevice( pDevExt->pDevice );
	}
}

/************************************************************************
* 函数名称:HelloDDKDispatchRoutine
* 功能描述:对读IRP进行处理
* 参数列表:
      pDevObj:功能设备对象
      pIrp:从IO请求包
* 返回 值:返回状态
*************************************************************************/
#pragma PAGEDCODE
NTSTATUS HelloDDKDispatchRoutine(IN PDEVICE_OBJECT pDevObj,
								 IN PIRP pIrp) 
{
	KdPrint(("Enter HelloDDKDispatchRoutine\n"));
	NTSTATUS status = STATUS_SUCCESS;
	// 完成IRP
	pIrp->IoStatus.Status = status;
	pIrp->IoStatus.Information = 0;	// bytes xfered
	IoCompleteRequest( pIrp, IO_NO_INCREMENT );
	KdPrint(("Leave HelloDDKDispatchRoutine\n"));
	return status;
}