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

# RtlNumberOfClearBits(3w)

## NAME

**RtlNumberOfClearBits** (NTDLL.@)

## SYNOPSIS

ULONG RtlNumberOfClearBits\
  (\
   PCRTL\_BITMAP *lpBits*\
  )

## DESCRIPTION

Find the number of clear bits in a bitmap.

## PARAMS

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

## RETURNS

The number of clear bits.

## IMPLEMENTATION

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

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

Debug channel **"ntdll"**.