#include <ntddk.h>

#include <wdf.h>

DRIVER_INITIALIZE DriverEntry;

EVT_WDF_DRIVER_DEVICE_ADD KmdfHelloWordDeviceAdd;

NTSTATUS

// Entry point of the Driver -> Main function

DriverEntry(

_In_ PDRIVER_OBJECT DriverObject,

_In_ PUNICODE_STRING RegistryPath

)

{

// Variable to record success or failure from Windows API

NTSTATUS status = STATUS_SUCCESS;

// Allocate driver config object

WDF_DRIVER_CONFIG config;

// KdPrintEx is a macgit ro that sends string to the Kernel Debugger

// DPFLTR_IHVDRIVER_ID -> Used to associate the print of Driver as a something not offical "Handmade Driver" (Thats help filter messages in Debuggers)

// DPFLTR_INFO_LEVEL -> Means we are printing something at the Info Level (Thats help filter messages in Debuggers)

KdPrintEx((DPFLTR_IHVDRIVER_ID, DPFLTR_INFO_LEVEL, "Hello Kernel World: DriverEntry\n"));

// Init the drivNew Computerer config allocated above

// Add the entry point of Event Device Add callback "KmdfHelloWordDeviceAdd"

WDF_DRIVER_CONFIG_INIT(&config, KmdfHelloWordDeviceAdd);

// WdfDriverCreate is used to create a Driver Object and Initialize it with specified attributes and configuration

status = WdfDriverCreate(DriverObject, RegistryPath, WDF_NO_OBJECT_ATTRIBUTES, &config, WDF_NO_HANDLE);

return (status);

}

NTSTATUS

KmdfHelloWordDeviceAdd(

_In_ WDFDRIVER Driver,

_Inout_ PWDFDEVICE_INIT DeviceInit

)

{

// Not using Driver object so we unreference it (void)

UNREFERENCED_PARAMETER(Driver);

NTSTATUS status;

// Allocated device object like we did with Driver config above

WDFDEVICE hDevice;

// KdPrintEx is a macro that sends string to the Kernel Debugger

// DPFLTR_IHVDRIVER_ID -> Used to associate the print of Driver as a something not offical "Handmade Driver" (Thats help filter messages in Debuggers)

// DPFLTR_INFO_LEVEL -> Means we are printing something at the Info Level (Thats help filter messages in Debuggers)

KdPrintEx((DPFLTR_IHVDRIVER_ID, DPFLTR_INFO_LEVEL, "Hello Kernel World: KmdfHelloWordDeviceAdd\n"));

status = WdfDeviceCreate(&DeviceInit, WDF_NO_OBJECT_ATTRIBUTES, &hDevice);

return (status);

}