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Cannot clear screen in console application

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XephreWolf
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Cannot clear screen in console application
« Thread started on: Dec 9^th, 2013, 04:22am »

One pet peeve I'm having with console applications is that the "cls" command does not function.

For instance, running the following...
Code:

print "Line A"
cls
input "Line B"; dummy
end

...produces, as expected, this output in the default mainwin:
Code:

Line B

but produces this output when compiled as a console application:
Code:

Line A
♀Line B

I was just wondering if there are any plans for fixing this?

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Richard Russell
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Posts: 1348

Re: Cannot clear screen in console application
« Reply #1 on: Dec 9^th, 2013, 09:21am »

on Dec 9^th, 2013, 04:22am, XephreWolf wrote:

I was just wondering if there are any plans for fixing this?

I don't think it would be easy to make CLS work - it sends a chr$(12) (Form Feed) character, and it's up to the receiving end how that is interpreted. The standard Windows console simply displays a symbol.

However you can clear the console screen from a LBB program:

Code:

    run "cmd /c cls"

although you will probably want to add a short delay afterwards before sending anything else:

Code:

    input "Line A? "; dummy
    run "cmd /c cls"
    timer 100, [cont]
    wait
[cont]
    timer 0
    input "Line B? "; dummy

Richard.

« Last Edit: Dec 9^th, 2013, 09:43am by Richard Russell »

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Richard Russell
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Posts: 1348

Re: Cannot clear screen in console application
« Reply #2 on: Mar 15^th, 2014, 11:39pm »

on Dec 9^th, 2013, 04:22am, XephreWolf wrote:

One pet peeve I'm having with console applications is that the "cls" command does not function.
I was just wondering if there are any plans for fixing this?

I have recently worked out how this can be achieved, so you can expect a future release of LBB to support CLS in a console application. Thanks for suggesting it.

Edit: CLS in console applications now implemented in LBB v2.53.

Richard.

« Last Edit: Mar 22^nd, 2014, 4:13pm by Richard Russell »

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