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

# RtlUnicodeToMultiByteSize(3w)

## NAME

**RtlUnicodeToMultiByteSize** (NTDLL.@)

## SYNOPSIS

NTSTATUS RtlUnicodeToMultiByteSize\
  (\
   PULONG  *size*,\
   LPCWSTR *str*,\
   ULONG   *len*\
  )

## DESCRIPTION

Calculate the *size* in bytes necessary for the multibyte conversion of *str*, without the terminating **' '**.

## PARAMS

*size* **\[Out\]**  Destination for *size*.

*str* **\[In\]**  String to calculate the *size* of.

*len* **\[In\]**  Length of *str*.

## RETURNS

**STATUS\_SUCCESS**.

## IMPLEMENTATION

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

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

Debug channel **"ntdll"**.