Manpages - TIFFFieldWriteCount.3tiff

TIFFFieldWriteCount - Get number of values to be written to field

#include <tiffio.h>

int TIFFFieldWriteCount(const TIFFField fip)*

TIFFFieldWriteCount returns the number of values to be written into the specified TIFF field; that is, the number of arguments that should be supplied to TIFFSetField. For most field types this is a small positive integer, typically 1 or 2, but there are some special values:
TIFF_VARIABLE indicates that a variable number of values is possible; then, a uint16_t count argument and a pointer data argument must be supplied to TIFFSetField.
TIFF_VARIABLE2 is the same as TIFF_VARIABLE except that the count argument must have type uint32_t. (On most modern machines, this makes no practical difference, and the count argument can simply be an int in either case.)
TIFF_SPP indicates that the number of arguments must be equal to the image’s number of samples per pixel.

fip is a field information pointer previously returned by TIFFFindField, TIFFFieldWithTag, or TIFFFieldWithName.

For most field types, TIFFFieldWriteCount returns the same value as TIFFFieldReadCount, but there are some exceptions.

TIFFFieldWriteCount returns an integer.

*libtiff*(3TIFF),

Libtiff library home page: http://www.simplesystems.org/libtiff/