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TIFFFIELDWRITECOUNT(3tiff) LibTIFF TIFFFIELDWRITECOUNT(3tiff)

NAME

TIFFFieldWriteCount - get number of values to be written to field

SYNOPSIS

#include <tiffio.h>



DESCRIPTION

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() <#c.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() <#c.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() <#c.TIFFFindField>, TIFFFieldWithTag() <#c.TIFFFieldWithTag>, or TIFFFieldWithName() <#c.TIFFFieldWithName>.

For most field types, TIFFFieldWriteCount() returns the same value as TIFFFieldReadCount() <#c.TIFFFieldReadCount>, but there are some exceptions.

RETURN VALUES

TIFFFieldWriteCount() returns an integer.

SEE ALSO

TIFFFieldDataType <> (3tiff), TIFFFieldName <> (3tiff), TIFFFieldPassCount <> (3tiff), TIFFFieldQuery <> (3tiff), TIFFFieldReadCount <> (3tiff), TIFFFieldTag <> (3tiff), libtiff <> (3tiff)

Author

LibTIFF contributors

Copyright

1988-2025, LibTIFF contributors

September 18, 2025 4.7