ImageGear for C and C++ on Linux v20.0 - Updated
API Reference Guide > ART Component API Reference > ART Component Functions Reference > Edit Undo Functions > ART_edit_undo_count

This function returns (in lpUndoCount) the number of times that ART_edit_undo() can be called.


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AT_ERRCOUNT ART_edit_undo_count(
        HIGEAR hIGear, 
        LPDWORD lpUndoCount


Name Type Description
hIGear HIGEAR HIGEAR handle to the image.
lpUndoCount LPDWORD A far pointer that returns the number of undo operations that can be performed.

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  */
AT_ERRCOUNT   nErrcount;    /* tally of IG errors on stack */
DWORD        dwMarkCount;  /* count of potential undos */
nErrcount = ART_edit_undo_count(hIGear, &dwMarkCount);


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

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