#include <ntddk.h>
VOID Unload(PDRIVER_OBJECT driver)
{
	DbgPrint("Unloading...\n");
}
NTSTATUS DriverEntry(PDRIVER_OBJECT driver, PUNICODE_STRING path)
{
	DEVICE_OBJECT newdevice;//过滤设备对象
	DEVICE_OBJECT targetdevice;//目标设备对象
	FILE_OBJECT fileobject;//过滤层文件对象
	UNICODE_STRING comname;//设备名称
	NTSTATUS status;
	PDEVICE_OBJECT poutdevice = NULL;

#if DBG
	_asm int 3
#endif
	DbgPrint("begin...\n");

	RtlInitUnicodeString(&comname, L"\\Device\\Serial0");//初始化设备名称字符串

	status = IoGetDeviceObjectPointer(&comname, FILE_ALL_ACCESS, &fileobject, &targetdevice);//获取设备对象
	if(status != STATUS_SUCCESS)
	{
		DbgPrint("获取串口设备对象失败！\n");
		return status;
	}

	status = IoCreateDevice(driver, 0, NULL, targetdevice.DeviceType, 0, FALSE, &newdevice);//创建过滤设备
	if(status != STATUS_SUCCESS)
	{
		DbgPrint("创建过滤设备失败！\n");
		return status;
	}

	if(targetdevice.Flags & DO_BUFFERED_IO)//拷贝重要标志位
		newdevice.Flags |=  DO_BUFFERED_IO;
	if(targetdevice.Flags & DO_DIRECT_IO)
		newdevice.Flags |= DO_DIRECT_IO;
	if(targetdevice.Characteristics & FILE_DEVICE_SECURE_OPEN)
		newdevice.Characteristics |= FILE_DEVICE_SECURE_OPEN;
	newdevice.Flags |= DO_POWER_PAGABLE;

	poutdevice = IoAttachDeviceToDeviceStack(&newdevice, &targetdevice);//绑定设备
	if(poutdevice == NULL)
	{
		DbgPrint("绑定设备失败！\n");
		IoDeleteDevice(&fileobject);
		return status;
	}

	IoDeleteDevice(&fileobject);
	driver->DriverUnload = Unload;
	return STATUS_SUCCESS;
}

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