ImageGear for C and C++ on Windows v19.0
IG_ISIS_tag_get_rational_default

Get default value of a tag of type rational.

Declaration:

 
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AT_ERRCOUNT ACCUAPI IG_ISIS_tag_get_rational_default(
        HISISDRV hDriver,
        AT_MODE nTag,
        WORD wIndex,
        LPAT_ISIS_RAT lpValue
);

Arguments:

Name Type Description
hDriver HISISDRV The handle to the driver.
nTag AT_MODE Specifies the type rational tag for which to return the default value.
wIndex WORD Specifies the index of the element to get. Most tags have only one element, in which case wIndex must be zero. Use IG_ISIS_tag_get_length_default to determine how many elements a tag contains.
lpValue LPAT_ISIS_RAT Points to the default value of the tag after this function completes.

Return Value:

Returns the number of ImageGear errors that occurred during this function call. If there are no errors, the return value is IGE_SUCCESS.

Supported Raster Image Formats:

This function does not process image pixels.

Remarks:

The IG_ISIS_tag_get_rational_default function retrieves the rational value that is the default value of the specified tag.

Use IG_ISIS_tag_get_rational_default to retrieve the default value of the type rational tag specified in nTag. Use IG_ISIS_tag_get_length_default to get the number of elements in the tag. If the tag has only one element, wIndex must be zero. If the tag has multiple elements, loop on IG_ISIS_tag_get_rational_default to obtain all elements of the default value of the tag.

Use of IG_ISIS_tag_get_rational_default on a tag other than one of type rational is undefined. At best, this will cause an invalid return value or a operating system error message, and at worst will cause the system to crash.

See Also

IG_ISIS_tag_get_length, IG_ISIS_tag_get_rational, IG_ISIS_tag_set_rational.

 

 


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