Inquiry of Octave to pgnuplot command log via pipe

[Tatsuro MATSUOKA]

Hello

I am now trying to make wgnuplot usable from the octave to modifying and/or 
additional programs.
What I have done the first is the taking the pipe by modifying the pgnuplot 
code.
One of problems of binary data of pipe was on the pgnuplot.
The 'stdin' on windows have text and binary mode.
The text mode catches cr+lf and eof codes and transfer them.
Therefore, the binary data could not be treated properly on pgnuplot.
I have set the  'stdin' to binary mode by,

_setmode(fileno(stdin), _O_BINARY);

and taking a log from pipe by

   /* wait for commands on stdin, and pass them on to the wgnuplot text
     * window */
     while (fgets(psBuffer, BUFFER_SIZE, stdin) != NULL) {
        fp=fopen("temp.dat", "ab");  // added   
        PostString(hwndText, psBuffer);
        fputs(psBuffer, fp);  // added
        fclose(fp);         // added 
    }
 
The octave command is

octave> plot (0:10);


The file attached is the log file.
Although data cannot be correct in the text mail but I show the problem point

********************************************
  :
  :
set palette positive color model RGB maxcolors 64;
set palette file "-" binary record=64 using 1:2:3:4;
?€?>・E?>8?B>plot "-" using ($1):($2) axes x1y1 title "" with lines 
linestyle 1 \
;
1 0 
2 1 
3 2 
4 3 
5 4 
6 5 
7 6 
8 7 
9 8 
10 9 
11 10 
e
********************************
In the gnuplot help

+++++++++++++
Binary palette files are supported as well,see binary general.Example:put 64 
triplets of R,G,B doubles
into file palette.bin and load it by 
set palette file "palette.bin"binary record=64 using 1:2:3

However,record causes gnuplot to not generate coordinate information. This is 
for the case where such
information may be included in one of the columns of the binary data file.
++++++++++++++

The log tell me  'using 1:2:3:4' not 'using 1:2:3'.
What the forth is ?

I cannot understand the what octave would like to do.
Please give me advise.

Regards

Tatsuro






  

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temp.dat
Description: 1676260423-temp.dat