TIFFFieldReadCount — LibTIFF 4.6.0t documentation

# TIFFFieldReadCount

## Synopsis

    #include <tiffio.h>

int `TIFFFieldReadCount`(const TIFFField *fip)

## Description

`TIFFFieldReadCount()` returns the number of values available to be read from the specified TIFF field; that is, the number of arguments that should be supplied to `TIFFGetField()`. For most field types this is a small positive integer, typically 1 or 2, but there are some special values:

- `TIFF_VARIABLE` `= -1` indicates that a variable number of values is possible; then, a `uint16_t` count argument and a pointer data argument must be supplied to `TIFFGetField()`.

- `TIFF_VARIABLE2` `= -3` is the same as `TIFF_VARIABLE` except that the count argument must have type `uint32_t`.

- `TIFF_SPP` `= -2` indicates that the number of arguments is equal to the image’s number of samples per pixel.

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

## Return values

`TIFFFieldReadCount()` returns an integer.

## See also

TIFFFieldDataType (3tiff), TIFFFieldName (3tiff), TIFFFieldPassCount (3tiff), TIFFFieldQuery (3tiff), TIFFFieldTag (3tiff), TIFFFieldWriteCount (3tiff), libtiff (3tiff)