#include "l_bitmap.h"
L_INT pEXT_CALLBACK YourFunction (uTag, uType, uCount, pUserData)
L_EnumFileTags calls 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 L_SetTag, or any other tag added by the TIFF filter when saving the file. For example, all TIFF comments would generate a particular TIFF tag.
Tagged data type. Valid values are:
Value | Meaning |
---|---|
TAG_BYTE | [1] Byte in the range of 0 to 255. |
TAG_ASCII | [2] Byte in the range of 0 to 127. |
TAG_SHORT | [3] Two bytes, unsigned. |
TAG_LONG | [4] Four bytes, unsigned. |
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_SBYTE | [6] Byte used as signed number in the range of -128 to +127. |
TAG_UNDEFINED | [7] Byte, with application-defined usage. |
TAG_SSHORT | [8] Two bytes, signed. |
TAG_SLONG | [9] Four bytes, signed. |
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. |
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.
A void pointer that you can use to access a variable or structure containing data that your callback function needs. This gives you a way to receive data indirectly from the function that uses this callback function. (This is the same pointer that you pass in the pUserData
parameter of the L_EnumMarkers function.)
Keep in mind that this is a void pointer, which must be cast to the appropriate data type within your callback function.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
L_EnumFileTags calls this callback for each tag in the page.
Do not attempt to use the L_DeleteTag function to delete tags from inside an ENUMTAGSCALLBACK callback function. To delete tags that you enumerate, use ENUMTAGSCALLBACK to add the tags to a list. Upon returning from L_EnumFileTags, you can delete all the tags from the list.
Required DLLs and Libraries
For an example, refer to L_ReadFileTag.
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