# `writeKeyValueData`

*Function*

## Declaration

```swift
func writeKeyValueData(_ file: UnsafeMutablePointer<FILE>, _ key: UnsafePointer<CChar>, _ Value: Data) -> Bool
```

```objc
BOOL writeKeyValueData(FILE *file, const char *key, NSData *Value);
```

```python
writeKeyValueData(file: FILE, key: str, Value: bytes) -> bool
```

## See Also

### Numbers and Data

- [`writeIntBuffer`](/Core/GlyphsCore/writeIntBuffer)
- [`writeIntList`](/Core/GlyphsCore/writeIntList)
- [`writeKeyValueInt`](/Core/GlyphsCore/writeKeyValueInt)
- [`writeKeyValueIntBuffer`](/Core/GlyphsCore/writeKeyValueIntBuffer)
- [`writeValueInt`](/Core/GlyphsCore/writeValueInt)
- [`writeFloat`](/Core/GlyphsCore/writeFloat)
- [`writeKeyValueFloat`](/Core/GlyphsCore/writeKeyValueFloat)
- [`writeValueFloat`](/Core/GlyphsCore/writeValueFloat)
- [`writeKeyValueFloatPrecision`](/Core/GlyphsCore/writeKeyValueFloatPrecision)
- [`writeKeyValueFloatList`](/Core/GlyphsCore/writeKeyValueFloatList)