ImageGear for C and C++ on Linux v20.0 - Updated
API Reference Guide > ART Component API Reference > ART Component Functions Reference > Named Block Management Functions > ART_mark_block_first

This function gets the first block name.


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AT_ERRCOUNT ART_mark_block_first(
        HIGEAR hIGear, 
        ART_MARK_INDEX hMarkIndex, 
        LPART_BLOCK_NAME lpBlockName


Name Type Description
hIGear HIGEAR HIGEAR handle to the image.
hMarkIndex ART_MARK_INDEX Mark identifier.
lpBlockName LPART_BLOCK_NAME A far pointer to an 8-byte array of memory that returns the type of block of the mark referenced by hMarkIndex. The block type is either an ART-defined constant beginning with ART_BLOCK or a user-defined block. See ARTAPI.H for the full list of ART-defined constants.

Return Value:

Returns the number of ImageGear errors that occurred during the function call.

Supported Raster Image Formats:

All pixel formats supported by ImageGear for C and C++.


Copy Code
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, 
while (*lpBlockName)
if (!memcmp(lpBlockName, ART_BLOCK_FILENAM, 
nErrcount = ART_mark_block_query(hIGear, 
hMarkIndex, &lpBlockName, 
(LPVOID)szFileName, &dwBlockSize);
if (!strcmp(szFileName, "Clown.tif"))
nErrcount = RT_mark_send_to_back(hIGear, 
nErrcount = ART_mark_block_next(hIGear, hMarkIndex, 


The block data for the named block retrieved by calling ART_mark_block_query(). ART_mark_block_next() is called to get the name of the next named block. If there are no blocks, ART_mark_block_first() sets lpBlockName to zero.

Many of ART's callback functions include the index number as a parameter. As part of your callback function, you can call ART_mark_block_first() and ART_mark_block_next() using the mark index that was passed in.

An error is set if any of the following conditions are met:

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