src/tiff/man/TIFFFieldReadCount.3tiff

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  24 .if n .po 0
  25 .TH TIFFFieldReadCount 3TIFF "July 26, 2012" "libtiff"
  26 .SH NAME
  27 TIFFFieldReadCount \- Get number of values to be read from field
  28 .SH SYNOPSIS
  29 .B "#include <tiffio.h>"
  30 .sp
  31 .BI "int TIFFFieldReadCount(const TIFFField* " fip ")"
  32 .SH DESCRIPTION
  33 .BR TIFFFieldReadCount
  34 returns the number of values available to be read from the specified
  35 TIFF field; that is, the number of arguments that should be supplied to
  36 .BR TIFFGetField .
  37 For most field types this is a small positive integer, typically 1 or 2,
  38 but there are some special values:
  39 .br
  40 .BR TIFF_VARIABLE
  41 indicates that a variable number of values is possible; then, a
  42 .BR uint16
  43 .I count
  44 argument and a pointer
  45 .I data
  46 argument must be supplied to
  47 .BR TIFFGetField .
  48 .br
  49 .BR TIFF_VARIABLE2
  50 is the same as
  51 .BR TIFF_VARIABLE
  52 except that the
  53 .I count
  54 argument must have type
  55 .BR uint32 .
  56 .br
  57 .BR TIFF_SPP
  58 indicates that the number of arguments is equal to the image's
  59 number of samples per pixel.
  60 .P
  61 .I fip
  62 is a field information pointer previously returned by
  63 .BR TIFFFindField ,
  64 .BR TIFFFieldWithTag ,
  65 or
  66 .BR TIFFFieldWithName .
  67 .br
  68 .SH "RETURN VALUES"
  69 .br
  70 .BR TIFFFieldReadCount
  71 returns an integer.
  72 .br
  73 .SH "SEE ALSO"
  74 .BR libtiff (3TIFF),
  75 .PP
  76 Libtiff library home page:
  77 .BR http://www.remotesensing.org/libtiff/