int main()

{

    HANDLE hDevice = CreateFile(L"\\\\.\\MyTest", GENERIC_READ | GENERIC_WRITE, , NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

    if (hDevice==INVALID_HANDLE_VALUE)

    {

        printf("Failed to obtain device handle...");

        getchar();

        return ;

    }

    UCHAR buffer[];

    ULONG size;

    LPDWORD ll;

    BOOL result = ReadFile(hDevice, buffer, , &size, NULL);

    if (result)

    {

        printf("READ %d BYTES...", size);

        for (size_t i = ; i < (size_t)size; i++)

        {

            printf("%02x\n", buffer[i]);

        }

    }

    CloseHandle(hDevice);

    getchar();

    return ;

}

#include <ntddk.h>

#define DEVICE_NAME L"\\Device\\MyTestDevice"

#define SYMBOL_LINK_NAME L"\\??\\MyTest"

PDEVICE_OBJECT pDevice;

UNICODE_STRING DeviceName;

UNICODE_STRING SymbolLinkName;

NTSTATUS DeviceCreate(PDEVICE_OBJECT pDeviceObject,PIRP pIrp);

NTSTATUS DeviceClose(PDEVICE_OBJECT pDeviceObject, PIRP pIrp);

NTSTATUS DeviceRead(PDEVICE_OBJECT pDeviceObject, PIRP pIrp);

NTSTATUS unload(PDRIVER_OBJECT driver)

{

    DbgPrint("driver :%ws unload", driver->DriverName);

    DbgPrint("driver unload success...");

    IoDeleteSymbolicLink(&SymbolLinkName);

    IoDeleteDevice(pDevice);

    return STATUS_SUCCESS;

}

NTSTATUS DriverEntry(PDRIVER_OBJECT driver,PUNICODE_STRING reg_path)

{

    NTSTATUS ntstatus = STATUS_SUCCESS;

    driver->DriverUnload = unload;

    driver->MajorFunction[IRP_MJ_CREATE] = DeviceCreate;//创建

    driver->MajorFunction[IRP_MJ_READ] = DeviceRead;//通信

    driver->MajorFunction[IRP_MJ_CLOSE] = DeviceClose;//关闭

    RtlInitUnicodeString(&DeviceName, DEVICE_NAME);

    RtlInitUnicodeString(&SymbolLinkName, SYMBOL_LINK_NAME);

    ntstatus = IoCreateDevice(driver, , &DeviceName, FILE_DEVICE_UNKNOWN, FILE_DEVICE_SECURE_OPEN, FALSE, &pDevice);

    if (!NT_SUCCESS(ntstatus))

    {

        DbgPrint("IoCreateDevice Failed");

        return ntstatus;

    }

    ntstatus = IoCreateSymbolicLink(&SymbolLinkName, &DeviceName);

    if (!NT_SUCCESS(ntstatus))

    {

        DbgPrint("IoCreateSymbolicLink Failed");

        IoDeleteDevice(pDevice);

        return ntstatus;

    }

    pDevice->Flags |= DO_BUFFERED_IO;

    DbgPrint("%ws", reg_path->Buffer);

    DbgPrint("driver load success...");

    return STATUS_SUCCESS;

}

NTSTATUS DeviceCreate(PDEVICE_OBJECT pDeviceObject, PIRP pIrp)

{

    //业务代码区

    //设置返回状态

    pIrp->IoStatus.Status = STATUS_SUCCESS;

    pIrp->IoStatus.Information = ;

    IoCompleteRequest(pIrp, IO_NO_INCREMENT);

    DbgPrint("create device success...%d",pDeviceObject->ActiveThreadCount);//这里蛋疼得狠，vs2019里，pDeviceObject不用一下，编译就报错，所有派遣函数一样

    return STATUS_SUCCESS;

}

NTSTATUS DeviceClose(PDEVICE_OBJECT pDeviceObject, PIRP pIrp)

{

    //业务代码区

    //设置返回状态

    pIrp->IoStatus.Status = STATUS_SUCCESS;//getLastError()得到的值

    pIrp->IoStatus.Information = ;            //返回给3环多少数据，没有填0

    IoCompleteRequest(pIrp, IO_NO_INCREMENT);

    DbgPrint("create device success...%d", pDeviceObject->ActiveThreadCount);

    return STATUS_SUCCESS;

}

NTSTATUS DeviceRead(PDEVICE_OBJECT pDeviceObject, PIRP pIrp)

{

    PIO_STACK_LOCATION iostack;

    iostack = IoGetCurrentIrpStackLocation(pIrp);

    ULONG length = iostack->Parameters.Read.Length;

    PVOID pBuffer = pIrp->AssociatedIrp.SystemBuffer;

    pIrp->IoStatus.Status = STATUS_SUCCESS;//getLastError()得到的值

    pIrp->IoStatus.Information = length;            //返回给3环多少数据，没有填0

    RtlFillMemory(pBuffer,length,0xAA);

    IoCompleteRequest(pIrp, IO_NO_INCREMENT);

    DbgPrint("read device success...%d", pDeviceObject->ActiveThreadCount);

    return STATUS_SUCCESS;

}