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

# RegisterClassA(3w)

## NAME

**RegisterClassA** (USER32.@)

## SYNOPSIS

ATOM RegisterClassA\
  (\
   const WNDCLASSA\* *wc*\
  )

## PARAMS

**\[In\]**  Address of structure with class data.

## DESCRIPTION

Register a window class.

## RETURNS

\>0: Unique identifier 0: Failure

## IMPLEMENTATION

Declared in **"winuser.h"**.

Implemented in **"dlls/user32/class.c"**.

Debug channel **"class"**.