# BuildPlayerProcessor

> Extend BuildPlayerProcessor to receive callbacks during a player build.

## Definition

* **Type:** Class
* **Namespace:** [UnityEditor.Build](/engine/6000.5/script-reference/unityeditor/build.md)
* **Assembly:** UnityEditor.CoreModule
* **Implements:** [IOrderedCallback](/engine/6000.5/script-reference/unityeditor/build/iorderedcallback.md)

```csharp
public abstract class BuildPlayerProcessor : IOrderedCallback
```

## Remarks

Add files and perform custom setup before the build starts. For more information, refer to [Use build callbacks](/engine/6000.5/manual/building-and-publishing/build-customize-build-pipeline/build-callbacks.md)

Additional Resources: [IFilterBuildAssemblies](/engine/6000.5/script-reference/unityeditor/build/ifilterbuildassemblies.md), [IPostBuildPlayerScriptDLLs](/engine/6000.5/script-reference/unityeditor/build/ipostbuildplayerscriptdlls.md), [IUnityLinkerProcessor](/engine/6000.5/script-reference/unityeditor/build/iunitylinkerprocessor.md), [IPreprocessBuildWithContext](/engine/6000.5/script-reference/unityeditor/build/ipreprocessbuildwithcontext.md), [IPostprocessBuildWithContext](/engine/6000.5/script-reference/unityeditor/build/ipostprocessbuildwithcontext.md)

## Properties

| Property                                                                                                 | Description                                                                                                                |
| -------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------- |
| [callbackOrder](/engine/6000.5/script-reference/unityeditor/build/buildplayerprocessor/callbackorder.md) | Returns the relative callback order for callbacks.  Callbacks with lower values are called before ones with higher values. |

## Methods

| Method                                                                                                       | Description                                                                 |
| ------------------------------------------------------------------------------------------------------------ | --------------------------------------------------------------------------- |
| [PrepareForBuild](/engine/6000.5/script-reference/unityeditor/build/buildplayerprocessor/prepareforbuild.md) | Implement this function to receive a callback before a Player build starts. |