---
name: "SDL_ReadU8"
section: "3"
platform: "linux"
package: "libsdl3-doc"
version: "3.2.10+ds-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/SDL_ReadU8"
---

# SDL\_ReadU8(3)

Use this function to read a byte from an SDL\_IOStream .

## NAME

SDL\_ReadU8 - Use this function to read a byte from an  **SDL\_IOStream** .

## HEADER FILE

Defined in SDL3/SDL\_iostream.h

## SYNOPSIS

```
#include "SDL3/SDL.h"
```

**bool SDL\_ReadU8(SDL\_IOStream \*src, Uint8 \*value);**

## DESCRIPTION

This function will return false when the data stream is completely read, and  **SDL\_GetIOStatus** () will return

**SDL\_IO\_STATUS\_EOF** . If false is returned and the stream is not at EOF,  **SDL\_GetIOStatus** () will return a different error value and  **SDL\_GetError** () will offer a human-readable message.

## FUNCTION PARAMETERS

- *src*

  the  **SDL\_IOStream**\
    to read from.

- *value*

  a pointer filled in with the data read.

## RETURN VALUE

Returns true on success or false on failure or EOF; call

**SDL\_GetError** () for more information.

## THREAD SAFETY

This function is not thread safe.

## AVAILABILITY

This function is available since SDL 3.2.0.