IMFMetadata::GetAllLanguages method

Gets a list of the languages in which metadata is available.

Syntax

HRESULT GetAllLanguages(
  [out] PROPVARIANT *ppvLanguages
);

Parameters

ppvLanguages [out]

A pointer to a PROPVARIANT that receives the list of languages. The list is returned as an array of null-terminated wide-character strings. Each string in the array is an RFC 1766-compliant language tag.

The returned PROPVARIANT type is VT_VECTOR | VT_LPWSTR. The list might be empty, if no language tags are present. The caller must free the PROPVARIANT by calling PropVariantClear.

Return value

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

For more information about language tags, see RFC 1766, "Tags for the Identification of Languages".

To set the current language, call IMFMetadata::SetLanguage.

Examples

The following example shows how to get the list of language tags and enumerate the list.

HRESULT DisplayLanguageList(IMFMetadata *pMetadata)
{
    PROPVARIANT varLangs;

    HRESULT hr = pMetadata->GetAllLanguages(&varLangs);
    if (SUCCEEDED(hr))
    {
        if (varLangs.vt == (VT_VECTOR | VT_LPWSTR))
        {
            for (ULONG i = 0; i < varLangs.calpwstr.cElems; i++)
            {
                wprintf(L"%s\n", varLangs.calpwstr.pElems[i]);
            }
        }
        else
        {
            hr = E_UNEXPECTED;
        }
        PropVariantClear(&varLangs);
    }
    return hr;
}

Requirements

See also

Media Metadata

IMFMetadata