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

# IUnknown\_GetClassID(3w)

## NAME

**IUnknown\_GetClassID** (SHLWAPI.175)

## SYNOPSIS

HRESULT IUnknown\_GetClassID\
  (\
   IUnknown\* *lpUnknown*,\
   CLSID\*    *lpClassId*\
  )

## DESCRIPTION

Call **IPersist\_GetClassID(3w)** on an object.

## PARAMS

*lpUnknown* **\[In\]**  Object supporting the **IPersist** interface.

*lpClassId* **\[Out\]**  Destination for Class Id.

## RETURNS

**Success:** **S\_OK**. *lpClassId* contains the Class Id requested.

**Failure:** **E\_FAIL**, If *lpUnknown* is **NULL**, **E\_NOINTERFACE** If *lpUnknown* does not support IPersist, Or an **HRESULT** error code.

## IMPLEMENTATION

Exported by ordinal only. Use **[GetProcAddress(3w)](/GetProcAddress/3w.md)** to obtain a pointer to the function.

Implemented in **"dlls/shlwapi/ordinal.c"**.

Debug channel **"shell"**.