---
title: dwSize
framework: Force Feedback
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 13.0+, macOS 10.2+]
path: forcefeedback/ffenvelope/dwsize
---

# dwSize

Size, in bytes, of this structure. This member must be initialized before the structure is used.

## Declaration

```swift
var dwSize: DWORD
```

## See Also

### Instance Properties

- [dwAttackLevel](forcefeedback/ffenvelope/dwattacklevel.md)
- [dwAttackTime](forcefeedback/ffenvelope/dwattacktime.md)
- [dwFadeLevel](forcefeedback/ffenvelope/dwfadelevel.md)
- [dwFadeTime](forcefeedback/ffenvelope/dwfadetime.md)