Problem with stn header in using stnmap

[Smita B]

im using Grads vers v1.8SL11 32-bit little-endianion on windows xp
Im trying to use stnmap utility to generate a map file.

what shuld be the nlev and flag data types (shuld they be defined as int
or float)

Issue 1:
--------

When i define nlev and flag as integers i get the following error

Starting scan of station data binary file.
Binary data file open: c:\programs\output.txt
Processing time = 1
  Invalid station hdr found in station binary file
  Possible causes:  Invalid level count in hdr
                    Descriptor file mismatch
                    File not station data
                    Invalid relative time
    levs = 0  flag = 1633771873  time = 0


but when i define them as float stnmap doesn't complain and creates a a
map file.

here is the c program for reference.


struct stnhdr
{
  char id[8];
  float lat;
  float lon;
  float t;
  int  nlev;   /* if defined as float then no error in stnmap */
  int flag;    /* same
}stn;
FILE *f2;

int main ()
{

int i,j,k;
float value;
f2 = fopen("OUTPUT.TXT","wb");

for(i =0;i<8;i++)
   stn.id[i]='a';
for(j=0;j<10;j++)
{
for(i = 0; i< 10; i++)
{
   stn.lat = j;
   stn.lon = i;
   value = i*j;
  if (i == 0)
  {
     stn.nlev = 0;
     stn.flag = 0;
     stn.t = 0.0;
     fwrite(&stn,sizeof(struct stnhdr),1,f2);
  }

  stn.nlev=1;
  stn.flag =1;
  fwrite(&stn,sizeof(struct stnhdr),1,f2);
  fwrite(&value, sizeof(float),1,f2);

}
}
stn.nlev = 0;
fwrite(&stn,sizeof(struct stnhdr),1,f2);

}


Issue 2:
--------
I try to plot using map file  with the following  script : but i don't get
any data plotted.


      clear
     set gxout value
     set display color
     open stat.ctl
set lat 60 78'
     'set lon -190 -155'
*
*
     'set stid off'
     'set ccolor rainbow'
     'display data'