---
title: OpenAComponent
framework: Core Services
role: symbol
role_heading: Function
platforms: [macOS 10.0+]
path: coreservices/1516558-openacomponent
---

# OpenAComponent

## Declaration

```occ
OSErr OpenAComponent(Component aComponent, ComponentInstance *ci);
```

## Parameters

- `aComponent`: 
- `ci`: 

## Return Value

A result code. See [Result Codes](carbon_core/component_manager.md).

## See Also

### Opening and Closing Components

- [OpenADefaultComponent](1516360-openadefaultcomponent.md)
- [OpenComponent](1516607-opencomponent.md)
- [OpenDefaultComponent](1516523-opendefaultcomponent.md)
- [CloseComponent](1516436-closecomponent.md)