Big Bad Bob wrote on 10/23/2017 2:57 AM:
> On 10/21/17 13:04, T M Smith wrote:
>> I am sure this is elementary to most but bear with me please.
>> I am using Raspbian on a pi. How does one get a reading to print on
>> screen in the same place on a continueing basis rather than printing
>> on a new line and scrolling.
>>
>
> if you're running this in a console, check out how 'curses' works.  You can
> also try the VT ANSI escape sequences yourself.
>
> you can also send a 'home' cursor to the screen to overwrite the same line
> over and over...
>
> https://en.wikipedia.org/wiki/ANSI_escape_code
>
> I think the right sequence for 'home cursor' is:
>
> [1G
>
> in C code it would be:
>
> "\x1b[1G"
>
> so don't do a line feed '\n' at the end, but do THAT instead, and I think
> the line will overwrite itself.  That's what you wanted, right?
>
> (I've done this before but I don't have the code in front of me at the
moment)
>
> OK curiosity bugs me now and so I wrote this:
>
>
>
> #include 
> #include 
>
> int main()
> {
> int i1;
>
>   for(i1=0; i1 < 500; i1++)
>   {
>     printf("Here I am: %d    \x1b[1G", i1);
>     fflush(stdout);
>     usleep(100000);
>   }
> }
>
>
>
> try it, you'll like it!

When updating a value you are displaying, don't forget to consider
formatting of the result.  If your numbers change from 3 digits to 2 digits
for example, the last digit of the previous value won't be overwritten
unless you use a fixed width format with spaces in front for shorter numbers.

--

Rick C

Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998

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