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:
Value | Meaning |
---|---|
TAG_BYTE | [1] Byte. |
TAG_ASCII | [2] Byte in the range of 0 to 255. |
TAG_SBYTE | [6] Byte used as signed number in the range of -128 to +127. |
TAG_UNDEFINED | [7] Byte, with application-defined usage. |
TAG_SHORT | [3] Two bytes, unsigned. |
TAG_SSHORT | [8] Two bytes, signed. |
TAG_LONG | [4] Four bytes, unsigned. |
TAG_SLONG | [9] Four bytes, signed. |
TAG_RATIONAL | [5] 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 | [10] 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 | [11] Four bytes used as a floating point number. |
TAG_DOUBLE | [12] Eight bytes used as a double-precision floating point number. |
TAG_IFD | [13] 32-bit IFD offset. |
TAG_LONG8 | [16] Unsigned 64-bit integer (valid only for BigTIFF formats). |
TAG_SLONG8 | [17] Signed 64-bit integer (valid only for BigTIFF formats). |
TAG_IFD8 | [18] 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.
Value | Meaning |
---|---|
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.
Win32, x64.
For an example, refer to LFile::EnumTags.
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