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.\" ========================================================================
.\"
.IX Title "funparamget 3"
.TH funparamget 3 "April 14, 2011" "version 1.4.5" "SAORD Documentation"
.SH "NAME"
FunParamGet \- get a Funtools param value
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  #include <funtools.h>
.Ve
.PP
.Vb 1
\&  int FunParamGetb(Fun fun, char *name, int n, int defval, int *got)
.Ve
.PP
.Vb 1
\&  int FunParamGeti(Fun fun, char *name, int n, int defval, int *got)
.Ve
.PP
.Vb 1
\&  double FunParamGetd(Fun fun, char *name, int n, double defval, int *got)
.Ve
.PP
.Vb 1
\&  char *FunParamGets(Fun fun, char *name, int n, char *defval, int *got)
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The four routines \fB\f(BIFunParamGetb()\fB\fR, \fB\f(BIFunParamGeti()\fB\fR,
\&\fB\f(BIFunParamGetd()\fB\fR, and \fB\f(BIFunParamGets()\fB\fR, return the value of
a \s-1FITS\s0 header parameter as a boolean, int, double, and string,
respectively. The string returned by \fB\f(BIFunParamGets()\fB\fR is a malloc'ed
copy of the header value and should be freed when no longer needed.
.PP
The first argument is the Fun handle associated with the \s-1FITS\s0 header
being accessed. Normally, the header is associated with the \s-1FITS\s0
extension that you opened with \fB\f(BIFunOpen()\fB\fR. However, you can use
\&\fIFunInfoPut()\fR to specify access of the primary header. In particular,
if you set the \s-1FUN_PRIMARYHEADER\s0 parameter to 1, then the primary
header is used for all parameter access until the value is reset to
0. For example:
.PP
.Vb 9
\&  int val;
\&  FunParamGeti(fun, "NAXIS", 1, 0, &got);              # current header
\&  val=1;
\&  FunInfoPut(fun, FUN_PRIMARYHEADER, &val, 0);         # switch to ...
\&  FunParamGeti(fun, "NAXIS", 1, 0, &got);              # ... primary header
\&  FunParamGeti(fun, "NAXIS", 2, 0, &got);              # ... primary header
\&  val=0;
\&  FunInfoPut(fun, FUN_PRIMARYHEADER, &val, 0);         # switch back to ...
\&  FunParamGeti(fun, "NAXIS", 2, 0, &got);              # current header
.Ve
.PP
Alternatively, you can use the \s-1FUN_PRIMARY\s0 macro to access parameters
from the primary header on a per-parameter basis:
.PP
.Vb 2
\&  FunParamGeti(fun, "NAXIS1", 0, 0, &got);              # current header
\&  FunParamGeti(FUN_PRIMARY(fun), "NAXIS1", 0, 0, &got); # primary header
.Ve
.PP
\s-1NB - \s0 \s-1FUN_PRIMARY\s0 is deprecated.
It makes use of a global parameter and therefore will not not
appropriate for threaded applications, when we make funtools
thread\-safe. We recommend use of \fIFunInfoPut()\fR to switch between the
extension header and the primary header.
.PP
For output data, access to the primary header is only possible until
the header is written out, which usually takes place when the first
data are written.
.PP
The second argument is the name of the parameter to access.  The third
\&\fBn\fR argument, if non\-zero, is an integer that will be added as a
suffix to the parameter name.  This makes it easy to use a simple loop
to process parameters having the same root name.  For example, to
gather up all values of \s-1TLMIN\s0 and \s-1TLMAX\s0 for each column in a binary
table, you can use:
.PP
.Vb 4
\&  for(i=0, got=1; got; i++){
\&    fun->cols[i]->tlmin = (int)FunParamGeti(fun, "TLMIN", i+1, 0.0, &got);
\&    fun->cols[i]->tlmax = (int)FunParamGeti(fun, "TLMAX", i+1, 0.0, &got);
\&  }
.Ve
.PP
The fourth \fBdefval\fR argument is the default value to return if
the parameter does not exist. Note that the data type of this
parameter is different for each specific \fIFunParamGet()\fR call. The final
\&\fBgot\fR argument will be 0 if no param was found. Otherwise the
data type of the parameter is returned as follows: \s-1FUN_PAR_UNKNOWN\s0
('u'), \s-1FUN_PAR_COMMENT\s0 ('c'), \s-1FUN_PAR_LOGICAL\s0 ('l'), \s-1FUN_PAR_INTEGER\s0
('i'), \s-1FUN_PAR_STRING\s0 ('s'), \s-1FUN_PAR_REAL\s0 ('r'), \s-1FUN_PAR_COMPLEX\s0 ('x').
.PP
These routines return the value of the header parameter, or the
specified default value if the header parameter does not exist.  The
returned value is a malloc'ed string and should be freed when no
longer needed.
.PP
By default, \fB\f(BIFunParamGets()\fB\fR returns the string value of the
named parameter.  However, you can use \fIFunInfoPut()\fR to retrieve the
raw 80\-character \s-1FITS\s0 card instead.  In particular, if you set the
\&\s-1FUN_RAWPARAM\s0 parameter to 1, then card images will be returned by
\&\fIFunParamGets()\fR until the value is reset to 0.
.PP
Alternatively, if the \s-1FUN_RAW\s0 macro is applied to the name, then the
80\-character raw \s-1FITS\s0 card is returned instead.  
\s-1NB - \s0 \s-1FUN_RAW\s0 is deprecated. 
It makes use of a global parameter and therefore will not not
appropriate for threaded applications, when we make funtools
thread\-safe. We recommend use of \fIFunInfoPut()\fR to switch between the
extension header and the primary header.
.PP
Note that in addition to the behaviors described above, the
routine \fB\f(BIFunParamGets()\fB\fR will return the 80 raw characters of the
\&\fBnth\fR \s-1FITS\s0 card (including the comment) if \fBname\fR is specified as
\&\s-1NULL\s0 and \fBn\fR is positive. For example, to loop through all \s-1FITS\s0
header cards in a given extension and print out the raw card, use:
.PP
.Vb 9
\&  for(i=1; ;i++){
\&    if( (s = FunParamGets(fun, NULL, i, NULL, &got)) ){
\&      fprintf(stdout, "%.80s\en", s);
\&      free(s);
\&    }
\&    else{
\&      break;
\&    }
\&  }
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
See funtools(7) for a list of Funtools help pages