X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=perl-module%2FExamples.pod;h=cb286ca19c12dbef9c6966888f4555d05da49c26;hb=HEAD;hp=fc3f016777dee06431fbb53a9dfaac40f74a269b;hpb=77612c9127e474daf7f06ba4dce7935b8eaf4052;p=pspp-builds.git

diff --git a/perl-module/Examples.pod b/perl-module/Examples.pod
index fc3f0167..cb286ca1 100644
--- a/perl-module/Examples.pod
+++ b/perl-module/Examples.pod
@@ -102,4 +102,45 @@ that it be correctly represented by pspp.
 	
 	$sysfile->close();
 
+=head2  Reading data
+
+Data can be read from a system file or other source:
+
+	use PSPP;
+
+	my $sf = PSPP::Reader->open ("foo.sav");
+
+	my $dict = $sf->get_dict ();
+
+
+Once opened, the dictionary can be used like any other.
+
+	for ($v = 0 ; $v < $dict->get_var_cnt() ; $v++)
+	{
+	    my $var = $dict->get_var ($v);
+
+	    # Print the variables
+	    my $name = $var->get_name ();
+	    my $label = $var->get_label ();
+	    print "Var: $name, Label: $label\n";
+
+	    # Retrieve and print the value labels
+	    my $vl = $var->get_value_labels ();
+	    print "$_: $vl->{$_}\n" for keys %$vl;
+	}
+
+
+Reading of data must be done sequentially using the C<get_next_case> method.
+
+	while (my $c = $sf->get_next_case () )
+	{
+	    my $v;
+	    for ($v = 0; $v < $dict->get_var_cnt(); $v++)
+	    {
+	        print "val$v: @$c[$v] ";
+	    }
+	    print "\n";
+	}
+
+
 =cut
\ No newline at end of file