Sorry if this is an incredibly naive question.

I prefer to pragmatically pause my programs periodically so that I can peruse output statements. Ideally, I'd like to continue by just hitting any old key. My feeble attempt below requires I enter at least one character and then the enter key.

char ignore;
writeln("Enter to continue");
readf(" %s", &ignore);

Is there a way to continue with any old key press? or just the enter key?

Thanks in advance.

On Tue, Jul 15, 2014 at 02:49:55AM +0000, WhatMeWorry via Digitalmars-d-learn wrote:
> Sorry if this is an incredibly naive question.
> 
> I prefer to pragmatically pause my programs periodically so that I can peruse output statements. Ideally, I'd like to continue by just hitting any old key. My feeble attempt below requires I enter at least one character and then the enter key.
> 
> char ignore;
> writeln("Enter to continue");
> readf(" %s", &ignore);
> 
> Is there a way to continue with any old key press? or just the enter key?
[...]

I don't know about Windows, but on Linux, you can just press ctrl-s and ctrl-q to pause/resume the console. (This is a Linux terminal function, not specific to D.)


T

-- 
Ruby is essentially Perl minus Wall.

On Tuesday, 15 July 2014 at 02:49:56 UTC, WhatMeWorry wrote:
> Sorry if this is an incredibly naive question.
>
> I prefer to pragmatically pause my programs periodically so that I can peruse output statements. Ideally, I'd like to continue by just hitting any old key. My feeble attempt below requires I enter at least one character and then the enter key.
>
> char ignore;
> writeln("Enter to continue");
> readf(" %s", &ignore);
>
> Is there a way to continue with any old key press? or just the enter key?
>
> Thanks in advance.


getch() reads any key and continues;

On Windows you can pipe you executable with the "more" command to pause after each page: your.exe | more

On Tuesday, 15 July 2014 at 10:22:52 UTC, rumbu wrote:
> getch() reads any key and continues;
>
> On Windows you can pipe you executable with the "more" command to pause after each page: your.exe | more

Don't forget that getch() is also Windows-specific.

On Tuesday, 15 July 2014 at 02:49:56 UTC, WhatMeWorry wrote:
> Is there a way to continue with any old key press? or just the enter key?

Yeah. It is more complex than you'd think but my terminal library can do it:

https://github.com/adamdruppe/arsd/blob/master/terminal.d

Example usage:

import terminal;

void main() {
  auto terminal = Terminal(ConsoleOutputType.linear);

  // gives real time input capability
  auto input = RealTimeConsoleInput(&terminal, ConsoleInputFlags.raw);

  // write to them
  terminal.writeln("Press any key to exit");

  // get a single key
  auto ch = input.getch();
  terminal.writeln("Bye!");
}


PS this is also described in my book http://www.packtpub.com/discover-advantages-of-programming-in-d-cookbook/book

>
> I don't know about Windows, but on Linux, you can just press ctrl-s and
> ctrl-q to pause/resume the console. (This is a Linux terminal function,
> not specific to D.)
>

In the Windows shell, the "pause" key will halt a program and "return" will resume it.