# ReadFileBytes (String filePath)

| **Name**    | ***ReadFileBytes***                                                                                                                        |
| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------ |
| Syntax      | ReadFileBytes (String filePath)                                                                                                            |
| Purpose     | To read and return entire contents of the specified file in bytes.                                                                         |
| Description | Reads all bytes of the file and returns a byte array containing all of the file’s contents. Use this function only for small binary files. |
| Return Type | Byte                                                                                                                                       |
| Parameter   | filePath \[System.String] – Full path of the file                                                                                          |

![](https://github.com/astera-software/Astera_Data_Stack_v9/blob/main/.gitbook/assets/0%20\(153\).png)

**Example**

In this example, we are passing the required parameter to the function transformation object using a *Variables* object.

Where,

*filePath* = C:\Users\Kanwal.Azim\OneDrive - Astera Software\Desktop\Functions Documentation\Files\ReadFileBytes\Test.txt

![](https://github.com/astera-software/Astera_Data_Stack_v9/blob/main/.gitbook/assets/1%20\(154\).png)

Right-click on the function transformation object and select *Preview Output.* You can see that Astera Data Stack has read and returned the bytes of the specified file.

![](https://github.com/astera-software/Astera_Data_Stack_v9/blob/main/.gitbook/assets/2%20\(154\).png)