SimpleIDE Terminal. Clear Screen?

doggiedoc · 2013-05-07 16:03

I'm trying to pragmatically clear the SimpleIDE Terminal screen and return the cursor to the home position.

printf("\1");

This returns the cursor to the top left of the window but neither

printf("\0");

nor

printf("\16");

clear the screen as I would expect.

I've resorted to this

printf("\1");
   int i;
   for (i = 0; i < 25; i++){
     printf ("                          \n");
     }
   printf("\1");

but it's kind of sloppy and inconsistent depending on how the window is resized.

I'm I missing something?

Thanks!

Paul

JasonDorie · 2013-05-07 16:07

Standard string printing uses the character zero as a string terminator, so your printf statement sees it and stops. You could trying doing a putc( 0 ) to STDOUT instead. Not sure if they've supported that in PropGCC, but that's a pretty standard way to write binary values to the output stream.

printf("\16") won't work - I think you need a preceding zero (octal) or a preceding x (hexidecimal), so try this:

printf( "\x10" );

Jason

jazzed · 2013-05-07 16:23

Try putchar('\0');

dgately · 2013-05-07 16:24

Are you using SimpleIDE that includes the simpletools library? CLS is defined there as 16...
And, you need to use the %c (character) format option in order to send the screen-affecting values


  pause(1000);                                // Wait 1 s for terminal software
  printf("Hello!");                           // Display test message
  pause(1000);                                // Wait 1 s for terminal software
  printf("%c",CLS);                                                   // works if you are including "simple tools.h"
  printf("Nice to see you!");                 // Display test message
  pause(1000);                                // Wait 1 s for terminal software
  printf("%c",16);                                                     // should always work
  printf("Goodbye!");                         // Display test message

dgately

doggiedoc · 2013-05-07 16:43

Thanks!

printf("\x10");

Worked.

doggiedoc · 2013-05-07 16:45

jazzed wrote: »

Try putchar('\0');

Thanks Steve, that works too.

doggiedoc · 2013-05-07 16:46

dgately - I am not using simpletools.h on this project. I started it before it was released.

dgately · 2013-05-07 17:11

doggiedoc wrote: »

dgately - I am not using simpletools.h on this project. I started it before it was released.

So, printf("%c",16); should work. also!

dgately

doggiedoc · 2013-05-07 17:14

dgately wrote: »

So, printf("%c",16); should work. also!

dgately

... and it does.

Thanks!

jazzed · 2013-05-07 17:19

dgately wrote: »

So, printf("%c",16); should work. also!

Only if the terminal option is set of course ;-)

doggiedoc · 2013-05-07 17:38

jazzed wrote: »

Only if the terminal option is set of course ;-)

The terminal option menu was my first hint at how to do it. Thanks Steve!

jazzed · 2013-05-07 20:24

Did you happen to find the User Guide?

doggiedoc · 2013-05-08 10:48

jazzed wrote: »

Did you happen to find the User Guide?

What? Where?

jazzed · 2013-05-08 10:58

doggiedoc wrote: »

What? Where?

It's here: http://learn.parallax.com/C/propeller-c-reference

doggiedoc · 2013-05-08 13:23

Thanks! But I thought User Guides were for people that don't know what they're doing.

Oh wait, that's me.

mindrobots · 2013-05-08 15:05

I've actually read several SimpleIDE user guides.....usually though they are the last bastion of refuge before facing the fact that you aren't as smart as you thought you were!

Andy Lindsay (Parallax) · 2013-05-08 19:38

Another option:

printf("%c", CLS);

You can also do things like:

printf("%cmyValue = %d, %c", HOME, myVariable, CLREOL) ;

That'll send the cursor to the top-left home position, display the decimal character representation of the myValue variable, then clear to the end of the line. First %c flag displays HOME, then %d displays second thing (myVariable), and third flag (another %c) displays CLREOL, which clears to end of line.

This is useful for having a display that stays in the top-left instead of scrolling. The CLREOL is important, because if your measurement changes from 105 to 98, you wouldn't want it displaying 985 (with stray 5 from previous measurement).

For more info, click Help and select Simple Library Reference. Then, follow the libsimpletools link.

doggiedoc · 2013-05-08 21:15

Thanks Andy that is a very useful tip!

doggiedoc · 2014-08-03 15:57

Sorry to revive my own thread but has something changed? I can't get SimpleIDE terminal to send the cursor to the home position and clear the screen?

Anybody got ideas?

jazzed · 2014-08-03 16:59

doggiedoc wrote: »

Sorry to revive my own thread but has something changed? I can't get SimpleIDE terminal to send the cursor to the home position and clear the screen?

Anybody got ideas?

What does the Terminal -> Options button -> Function tab show?

What IDE version do you have?

doggiedoc · 2014-08-03 17:05

All functions have a check mark. SimpleIDE v 0.9.66 on MacOS 0.9.4 -

It works if I use:

print("%c", CLS);

but does not work with:

printf("%c", CLS);

jazzed · 2014-08-03 17:18

doggiedoc wrote: »
All functions have a check mark. SimpleIDE v 0.9.66 on MacOS 0.9.4 -

It works if I use:
print("%c", CLS);
but does not work with:
printf("%c", CLS);

The printf output is buffered unless you do something special or send a "\n". It takes more work than necessary. Use putchar('\0') if you like.

The Learn library functions don't require special sauce. Use print("%c", CLS), printi("%c", CLS), or putChar(CLS).

doggiedoc · 2014-08-03 17:36

Thanks Steve - print("%c", CLS) is working fine for me now. I thought I had tried it earlier but I think I had typos or something.

Thanks again.

SimpleIDE Terminal. Clear Screen?

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