virtual L_INT LFile::EnumTagsCallBack(uTag, uType, uCount)
The LFile::EnumTags function will call this callback for each tag present on the page.
Tag to identify the data in the TIFF file. This may be any tag specified in LFileSettings::SetTag, or any other tag added by the TIFF filter when saving the file. For example, all of the TIFF comments would generate a particular TIFF tag.
Tagged data type. Valid values are:
|TAG_ASCII|| Byte in the range of 0 to 255.|
|TAG_SBYTE|| Byte used as signed number in the range of -128 to +127.|
|TAG_UNDEFINED|| Byte, with application-defined usage.|
|TAG_SHORT|| Two bytes, unsigned.|
|TAG_SSHORT|| Two bytes, signed.|
|TAG_LONG|| Four bytes, unsigned.|
|TAG_SLONG|| Four bytes, signed.|
|TAG_RATIONAL|| Eight bytes, used as a pair of unsigned long integers, where the first number is the numerator and the second is the denominator of a fraction.|
|TAG_SRATIONAL|| Eight bytes, used as a pair of signed long integers, where the first number is the numerator and the second is the denominator of a fraction.|
|TAG_FLOAT|| Four bytes used as a floating point number.|
|TAG_DOUBLE|| Eight bytes used as a double-precision floating point number.|
|TAG_IFD|| 32-bit IFD offset.|
|TAG_LONG8|| Unsigned 64-bit integer (valid only for BigTIFF formats).|
|TAG_SLONG8|| Signed 64-bit integer (valid only for BigTIFF formats).|
|TAG_IFD8|| 64-bit IFD offset (valid only for BigTIFF formats).|
Number of elements of type uType. Note that this is not the same as the number of bytes. For example, if uCount is 10 and uType is TAG_LONG, you will need 10 x 4 = 40 bytes to read the tag data.
|SUCCESS||The function was successful.|
|< 1||An error occurred. Refer to Return Codes.|
The LFile::EnumTags function calls this callback for each tag in the page. For more information, refer to LFile::EnumTags.
Do not attempt to use the LFile::DeleteTag function to delete tags from inside an LFile::EnumTagsCallback callback function. If you want to delete tags that you enumerate, use LFile::EnumTagsCallback to add the tags to a list. Upon returning from LFile::EnumTags, you can delete all the tags from the list.
For an example, refer to LFile::EnumTags.
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