IG_ISIS_tag_set

Set the value of a type rational tag.

Declaration:

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

Name	Type	Description
hDriver	HISISDRV	The handle to the driver.
nTag	AT_MODE	Specifies the type rational tag to set.
wIndex	WORD	Specifies which element to set. wIndex must be greater than or equal to zero and at most one less than the value returned by IG_ISIS_tag_get_length.
lpValue	LPAT_ISIS_RAT	Specifies the value to which to set nTag's specified element.

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

This function does not process image pixels.

The IG_ISIS_tag_set_rational function sets the value of the specified type rational tag's specified element to the given value.

Use IG_ISIS_tag_set_rational to set the specified element of nTag to the rational value given in lpValue.IG_ISIS_tag_set_rational will not automatically increase the number of elements in a tag. You must use IG_ISIS_tag_set_length before calling IG_ISIS_tag_set_rational to do this.

The following example sets the rational value of IG_ISIS_TAG_RESOLUTION:

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AT_ISIS_RAT ratValue; ratValue.Num = 300; ratValue.Denom = 1;IG_ISIS_tag_set_rational(hDriver, IG_ISIS_TAG_XRESOLUTION, 0, &ratValue);