fprint · ropen · wopen · xopen

Open and Write to Files (Obsolete)

ropen()

Syntax:

ropen("infile")

ropen()

Description:

Ropen() opens infile for reading. A subsequent ropen() with no arguments closes the previously opened infile. A file which is re-opened with ropen(infile) positions the stream at the beginning of the file.

Example:

proc r() {
   ropen("file.dat")
   for (i=0; i<ndat; i=i+1) {
      x[i] = fscan()  y[i]=fscan()
   }
   ropen()
}

Diagnostics:

This function returns 0 if the file is not successfully opened.

See also

read, fscan(), getstr(), File

Warning

There is no way to open more than one read file at a time. The same is true for write files.

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wopen()

Syntax:

wopen("outfile)

wopen()

Description:

Wopen is similar to ropen but opens a file for writing. Contents of an already existing outfile are destroyed. Wopened files are written to with fprint(). With no argument, the previously wopened file is closed. Wopen returns 0 on failure to open a file.

Example:

proc w() {
   wopen("file.dat")
   for (i=0; i<ndat; i=i+1) {
      fprint("%g %g\n", x[i], y[i])
   }
   wopen()
}

See also

fprint(), File()

---

xopen()

Syntax:

xopen("hocfile")

xopen("hocfile", "RCSrevision")

Description:

Xopen() executes the commands in hocfile. This is a convenient way to define user functions and procedures. An optional second argument is the RCS revision number in the form of a string. The RCS file with that revision number is checked out into a temporary file and executed. The temporary file is then removed. A file of the same primary name is unaffected.

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fprint()

Same as printf() but prints to a file opened with wopen(). If no file is opened it prints to the standard output.