HRESULT read_types	(	HKEY	root,
		LPCWSTR	key,
		ULONG *	supplied,
		ULONG	requested,
		DMO_PARTIAL_MEDIATYPE *	types
	)		`[static]`
Definition at line 715 of file dmoreg.c.
Referenced by DMOGetTypes(), and IEnumDMO_fnNext().
{
    HRESULT ret = S_OK;
    if (MSDMO_MAJOR_VERSION > 5)
    {
        DWORD len;
        len = requested * sizeof(DMO_PARTIAL_MEDIATYPE);
        ret = RegQueryValueExW(root, key, NULL, NULL, (LPBYTE) types, &len);
        *supplied = len / sizeof(DMO_PARTIAL_MEDIATYPE);
    }
    else
    {
        HKEY hkey;
        WCHAR szGuidKey[64];

        *supplied = 0;
        if (ERROR_SUCCESS == RegOpenKeyExW(root, key, 0, KEY_READ, &hkey))
        {
          int index = 0;
          WCHAR szNextKey[MAX_PATH];
          DWORD len;
          LONG rc = ERROR_SUCCESS;

          while (rc == ERROR_SUCCESS)
          {
            len = MAX_PATH;
            rc = RegEnumKeyExW(hkey, index, szNextKey, &len, NULL, NULL, NULL, NULL);
            if (rc == ERROR_SUCCESS)
            {
              HKEY subk;
              int sub_index = 0;
              LONG rcs = ERROR_SUCCESS;
              WCHAR szSubKey[MAX_PATH];

              RegOpenKeyExW(hkey, szNextKey, 0, KEY_READ, &subk);
              while (rcs == ERROR_SUCCESS)
              {
                len = MAX_PATH;
                rcs = RegEnumKeyExW(subk, sub_index, szSubKey, &len, NULL, NULL, NULL, NULL);
                if (rcs == ERROR_SUCCESS)
                {
                  if (*supplied >= requested)
                  {
                    /* Bailing */
                    ret = S_FALSE;
                    rc = ERROR_MORE_DATA;
                    rcs = ERROR_MORE_DATA;
                    break;
                  }

                  wsprintfW(szGuidKey,szToGuidFmt,szNextKey);
                  CLSIDFromString(szGuidKey, &types[*supplied].type);
                  wsprintfW(szGuidKey,szToGuidFmt,szSubKey);
                  CLSIDFromString(szGuidKey, &types[*supplied].subtype);
                  TRACE("Adding type %s subtype %s at index %i\n",
                    debugstr_guid(&types[*supplied].type),
                    debugstr_guid(&types[*supplied].subtype),
                    *supplied);
                  (*supplied)++;
                }
                sub_index++;
              }
              index++;
            }
          }
          RegCloseKey(hkey);
        }
    }
    return ret;
}
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