AT_ERRCOUNT ART_mark_block_first(
        HIGEAR hIGear, 
        ART_MARK_INDEX hMarkIndex, 
        LPART_BLOCK_NAME lpBlockName
);

HIGEAR  hIGear; /* HIGEAR handle of image */
ART_MARK_INDEX hMarkIndex; /* index to mark   */
ART_BLOCK_NAME lpBlockname; /* type of block   */
/* to return   */
CHAR szFileName[_MAX_PATH]; /* file name buffer  */
DWORD dwBlockSize;  /* size of a named  Block  */
nErrcount = ART_mark_block_first(hIGear, hMarkIndex, 
&lpBlockName);
while (*lpBlockName)
{
if (!memcmp(lpBlockName, ART_BLOCK_FILENAM, 
sizeof(ART_BLOCK_NAME))
{
nErrcount = ART_mark_block_query(hIGear, 
hMarkIndex, &lpBlockName, 
(LPVOID)szFileName, &dwBlockSize);
if (!strcmp(szFileName, "Clown.tif"))
{
nErrcount = RT_mark_send_to_back(hIGear, 
hMarkIndex);
}
}
nErrcount = ART_mark_block_next(hIGear, hMarkIndex, 
&lpBlockName);
}