idlastro / FITS Binary Table Extensions I/O: FXHREAD

[Source code]

NAME
FXHREAD
Purpose
Reads a FITS header from an opened disk file.
Explanation
Reads a FITS header from an opened disk file.
Use
FXHREAD, UNIT, HEADER  [, STATUS ]
Inputs
UNIT    = Logical unit number.
Opt. Inputs
Outputs
HEADER  = String array containing the FITS header.
Opt. Outputs
STATUS  = Condition code giving the status of the read.  Normally, this
          is zero, but is set to !ERR if an error occurs, or if the
          first byte of the header is zero (ASCII null).
Keywords
None.
Calls
None.
Common
None.
Restrictions
The file must already be positioned at the start of the header.  It
must be a proper FITS file.
Side effects
The file ends by being positioned at the end of the FITS header, unless
an error occurs.
Category
Data Handling, I/O, FITS, Generic.
Prev. Hist.
W. Thompson, Feb 1992, from READFITS by J. Woffard and W. Landsman.
W. Thompson, Aug 1992, added test for SIMPLE keyword.
Written
William Thompson, GSFC, February 1992.
Modified
Version 1, William Thompson, GSFC, 12 April 1993.
        Incorporated into CDS library.
Version
Version 1, 12 April 1993.
Converted to IDL V5.0   W. Landsman   September 1997