---
name: "RtlAreBitsClear"
section: "3w"
platform: "linux"
package: "libwine-dev"
version: "1.4.1-4"
release: "Debian 7 (Wheezy)"
platforms: ["linux"]
url: "https://new.carta.tech/RtlAreBitsClear"
---

# RtlAreBitsClear(3w)

## NAME

**RtlAreBitsClear** (NTDLL.@)

## SYNOPSIS

BOOLEAN RtlAreBitsClear\
  (\
   PCRTL\_BITMAP *lpBits*,\
   ULONG        *ulStart*,\
   ULONG        *ulCount*\
  )

## DESCRIPTION

Determine if part of a bitmap is clear.

## PARAMS

*lpBits* **\[In\]**  Bitmap pointer.

*ulStart* **\[In\]**  First bit to check from.

*ulCount* **\[In\]**  Number of consecutive bits to check.

## RETURNS

**TRUE**, If *ulCount* bits from *ulStart* are clear. **FALSE**, Otherwise.

## IMPLEMENTATION

Declared in **"winternl.h"**.

Implemented in **"dlls/ntdll/rtlbitmap.c"**.

Debug channel **"ntdll"**.