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# init(windowRef:)

Returns a Cocoa window created from a Carbon window.

```
convenience init?(windowRef: UnsafeMutableRawPointer)
```

## Parameters

`windowRef`

The Carbon `WindowRef` object to use to create the Cocoa window.

## Return Value

A Cocoa window created from `windowRef`.

## Discussion

For more information on Carbon-Cocoa integration, see Using a Carbon User Interface in a Cocoa Application in Carbon-Cocoa Integration Guide.

### Special Considerations

For historical reasons, contrary to normal memory management policy `initWithWindowRef:` does *not* retain `windowRef`. It is therefore recommended that you make sure you retain `windowRef` before calling this method. If `windowRef` is still valid when the Cocoa window is deallocated, the Cocoa window will release it.

## See Also

[`NSWindow`](/documentation/AppKit/NSWindow)

A window that an app displays on the screen.


---

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