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---
page_type: sample
description: "Supports four objects - a device object, a storage object, a folder object, and a file object."
languages:
- cpp
products:
- windows
- windows-wdk
---
# WPDHelloWorld sample driver for portable devices
The WpdHelloWorld sample driver supports four objects: a device object, a storage object, a folder object, and a file object. Each object supports corresponding properties. These properties are defined in the file WpdObjectProperties.h.
The sample driver supports a device object that exposes ten read-only properties. These properties, their types, and their values are listed in the following table.
| Property name | Property type | Value |
| --- | --- | --- |
| DEVICE_PROTOCOL | String | "Hello World Protocol ver 1.00" |
| DEVICE_FIRMWARE_VERSION | String | "1.0.0.0" |
| DEVICE_POWER_LEVEL | Integer | 100 |
| DEVICE_MODEL | String | "Hello World!" |
| DEVICE_MANUFACTURER | String | "Windows Portable Devices Group" |
| DEVICE_FRIENDLY | String | "Hello World!" |
| DEVICE_SERIAL_NUMBER | String | "01234567890123-45676890123456" |
| DEVICE_SUPPORTS_NONCONSUMABLE | Bool | True |
| WPD_DEVICE_TYPE | Integer | WPD_DEVICE_TYPE_GENERIC |
| WPD_FUNCTIONAL_OBJECT_CATEGORY | GUID | WPD_FUNCTIONAL_CATEGORY_STORAGE |
The driver supports a storage object that exposes seven read-only properties. These properties, their types, and their values are listed in the following table.
| Property name | Property type | Value |
| --- | --- | --- |
| STORAGE_CAPACITY | 64-bit Integer | 1024 * 1024 |
| STORAGE_FREE_SPACE_IN_BYTES | 64-bit Integer | 1024 * 1024 |
| STORAGE_SERIAL_NUMBER | String | 98765432109876-54321098765432 |
| STORAGE_FILE_SYSTEM_TYPE | String | FAT32 |
| STORAGE_DESCRIPTION | String | Hello World! Memory Storage System |
| WPD_STORAGE_TYPE | Integer | WPD_STORAGE_TYPE_FIXED_ROM |
| WPD_FUNCTIONAL_OBJECT_CATEGORY | GUID | WPD_FUNCTIONAL_CATEGORY_STORAGE |
The driver supports a folder object that exposes three read-only properties. These properties, their types, and their values are listed in the following table.
| Property name | Property type | Value |
| --- | --- | --- |
| WPD_OBJECT_DATE_MODIFIED | Date | 2006/6/26 5:0:0.0 |
| WPD_OBJECT_DATE_CREATED | Date | 2006/1/25 12:0:0.0 |
| WPD_OBJECT_ORIGINAL_FILE_NAME_VALUE | String | Documents |
The driver supports a file object that exposes three read-only properties. These properties, their types, and their values are listed in the following table.
| Property name | Property type | Value |
| --- | --- | --- |
| WPD_OBJECT_DATE_MODIFIED | Date | 2006/6/26 5:0:0.0 |
| WPD_OBJECT_DATE_CREATED | Date | 2006/1/25 12:0:0.0 |
| WPD_OBJECT_ORIGINAL_FILE_NAME | String | Readme.txt |
In addition to the above properties, every object (for example, device, storage, folder, or file) also supports seven common WPD object properties. These are read-only properties that contain object-specific values for the most part. These properties, their types, and their values are listed in the following table.
| Property name | Property type | Value |
| --- | --- | --- |
| WPD_OBJECT_ID | String | Object-specific |
| WPD_OBJECT_PERSISTENT_UNIQUE_ID | String | Object-specific |
| WPD_OBJECT_PARENT_ID | String | Object-specific |
| WPD_OBJECT_NAME | String | Object-specific |
| WPD_OBJECT_FORMAT | GUID | Object-specific |
| WPD_OBJECT_CONTENT_TYPE | GUID | Object-specific |
| WPD_OBJECT_CAN_DELETE | Bool | False |
For a complete description of this sample and its underlying code and functionality, refer to the [WPD HelloWorld Driver](https://docs.microsoft.com/windows-hardware/drivers/portable/the-sample-driver-architecture) description in the Windows Driver Kit documentation.
## Related topics
[WPD Design Guide](https://docs.microsoft.com/windows-hardware/drivers/portable/wpd-design-guide)
[WPD Driver Development Tools](https://docs.microsoft.com/windows-hardware/drivers/portable/familiarizing-yourself-with-the-sample-driver)
[WPD Programming Guide](https://docs.microsoft.com/windows-hardware/drivers/portable/wpd-programming-guide)
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