Windows核心編程的一個小例子

#include "ntddk.h"

void Example1Unload(IN PDRIVER_OBJECT pDrvobj)
{
UNICODE_STRING usDosDevName;
DbgPrint("Example1: Driver is being unload.\n");

RtlInitUnicodeString(&usDosDevName, L"\\DosDevices\\ExampleLINK2");
IoDeleteSymbolicLink(&usDosDevName);
IoDeleteDevice(pDrvobj->DeviceObject);
}

NTSTATUS ExampleIrp(IN PDEVICE_OBJECT device, IN PIRP pIrp)
{

DbgPrint("An driver routine is called.\n");
return STATUS_SUCCESS;
}

NTSTATUS DriverEntry(IN PDRIVER_OBJECT pDrvObj, IN PUNICODE_STRING pUsRegPath)
{
NTSTATUS status = STATUS_UNSUCCESSFUL;
UNICODE_STRING usDevName;
UNICODE_STRING usDosDevName;
PDEVICE_OBJECT pDevObj = NULL;
unsigned int nIndex;
DbgPrint("Example: Driver entry is called. \n");

RtlInitUnicodeString(&usDevName, L"\\Device\\Example3");
RtlInitUnicodeString(&usDosDevName, L"\\DosDevices\\ExampleLINK2");

// Create Device
status = IoCreateDevice(pDrvObj, 0, &usDevName, FILE_DEVICE_UNKNOWN, 
FILE_DEVICE_SECURE_OPEN, FALSE, &pDevObj);

if(NT_SUCCESS(status))
{
for(nIndex = 0; nIndex < IRP_MJ_MAXIMUM_FUNCTION; ++nIndex)
pDrvObj->MajorFunction[nIndex] = ExampleIrp;

pDrvObj->DriverUnload = Example1Unload;

// 把建立的裝置儲存起來，否則以後不能引用
pDrvObj->DeviceObject = pDevObj;
status = IoCreateSymbolicLink(&usDosDevName, &usDevName);
if(!NT_SUCCESS(status))
{
DbgPrint("IoCreateSymbolicLink failed.\n");
IoDeleteDevice(pDevObj);

}
else
{
DbgPrint("Successed!.\n");
}

}
else
{
DbgPrint("IoCreateDevice failed\n");
}

    return status;

}