Re: How to simulate Window's "Press any key to continue..."
On Friday, 22 November 2019 at 04:10:23 UTC, FireController#1847
wrote:
I'm an extreme beginner to DLang (just started using it.. oh,
an hour ago?), and I already can't figure out a, what I'd
consider, fairly simplistic thing.
This is my current code:
module DTestApp1;
import std.stdio;
int main() {
write("Press any key to continue...");
stdin.read();
return 0;
}
I am using Visual Studio to write it, and no matter what I do I
cannot get it to work. I attempted to import std.stream;, but
it said that while it could find the file, it cannot be read.
Am I using the wrong function?
For those who don't know, what I'm trying to do is pause the
program until literally any key is pressed while in the console.
execute(["pause"]);
Re: How to simulate Window's "Press any key to continue..."
On Friday, 22 November 2019 at 09:25:37 UTC, Ali Çehreli wrote: https://github.com/adamdruppe/arsd/blob/master/terminal.d I have this exact thing as a sample in my docs: http://dpldocs.info/experimental-docs/arsd.terminal.html#single-key You could wrap that up in a function if you don't want anything else. though personally I'd just do "press enter to continue" since it is so much easier and avoids the dependency. you can use my module by copying the whole file to your source and using it, or it is a dub package arsd-official:terminal too
Re: How to simulate Window's "Press any key to continue..."
On Friday, 22 November 2019 at 04:45:21 UTC, Mike Parker wrote: On Friday, 22 November 2019 at 04:22:07 UTC, FireController#1847 wrote: Right, but readln will only wait until the user presses the delimiter (by default Enter/Return). I want it to wait until ANY key is pressed, not a specific key The documentation for std.stdio.File shows two functions for reading input: readln and readf. If readln isn't what you want, then readf probably is: https://dlang.org/phobos/std_stdio.html#.File.readf Also, there's a freely available book online to help get you up to speed: Programming in D. Here's the section on reading from stdin with readf: http://ddili.org/ders/d.en/input.html stdin is buffered and will not be forwarded to the D-library until you press enter. The solution is different on Linux and Windows. On Linux you need to disable the "CANON" mode in the terminal. https://stackoverflow.com/questions/1449324/how-to-simulate-press-any-key-to-continue There are a few suggestions for Windows in the link as well. Annoyingly complicated for such a simple thing but that's how it is.
Re: How to simulate Window's "Press any key to continue..."
On 11/21/19 9:10 PM, Mike Parker wrote:> On Friday, 22 November 2019 at
04:45:21 UTC, Mike Parker wrote:
> You need to call readf with a character
> format string (%c):
>
> import std.stdio;
> void main()
> {
> writeln("Press any key to continue...");
>
> char c;
> readf("%c", );
> writeln("Thanks!");
> }
Unfortunately, that won't work either as it requires stdin to be
unbuffered, which is not the case in most terminals.
The main issue here is that a D program cannot know that stdin is bound
to a keyword. One needs to use a terminal module like the suggested
curses or Adam's terminal.d:
https://github.com/adamdruppe/arsd/blob/master/terminal.d
If it's too much unnecessary complication, then "Press Enter to
continue..." is perfectly fine to me. ;) (But of course you can't move
the cursor with that. :/)
Ali
Re: How to simulate Window's "Press any key to continue..."
On Friday, 22 November 2019 at 04:45:21 UTC, Mike Parker wrote:
On Friday, 22 November 2019 at 04:22:07 UTC,
FireController#1847 wrote:
Right, but readln will only wait until the user presses the
delimiter (by default Enter/Return). I want it to wait until
ANY key is pressed, not a specific key
The documentation for std.stdio.File shows two functions for
reading input: readln and readf. If readln isn't what you want,
then readf probably is:
https://dlang.org/phobos/std_stdio.html#.File.readf
Also, there's a freely available book online to help get you up
to speed: Programming in D. Here's the section on reading from
stdin with readf:
http://ddili.org/ders/d.en/input.html
Sorry, I just noticed the book doesn't cover how to do what you
want and it's probably not obvious. You need to call readf with a
character format string (%c):
import std.stdio;
void main()
{
writeln("Press any key to continue...");
char c;
readf("%c", );
writeln("Thanks!");
}
Re: How to simulate Window's "Press any key to continue..."
On Friday, 22 November 2019 at 04:22:07 UTC, FireController#1847 wrote: Right, but readln will only wait until the user presses the delimiter (by default Enter/Return). I want it to wait until ANY key is pressed, not a specific key The documentation for std.stdio.File shows two functions for reading input: readln and readf. If readln isn't what you want, then readf probably is: https://dlang.org/phobos/std_stdio.html#.File.readf Also, there's a freely available book online to help get you up to speed: Programming in D. Here's the section on reading from stdin with readf: http://ddili.org/ders/d.en/input.html
Re: How to simulate Window's "Press any key to continue..."
On Friday, 22 November 2019 at 04:41:30 UTC, mipri wrote:
~this() { reset(); }
Oh, if you don't ever call raw() this will break your terminal.
I just copied some code from a toy program and adapted it, and
didn't notice that until I posted.
Re: How to simulate Window's "Press any key to continue..."
On Friday, 22 November 2019 at 04:22:07 UTC, FireController#1847
wrote:
Right, but readln will only wait until the user presses the
delimiter (by default Enter/Return). I want it to wait until
ANY key is pressed, not a specific key
If curses is available you can use it, at the cost of completely
changing how you do I/O (in a good way if you need lots of
updates):
#! /usr/bin/env dub
/+ dub.sdl:
dependency "nice-curses" version="~>0.2.5"
+/
import std.stdio;
import nice.curses: Curses;
void main() {
auto curses = new Curses;
auto scr = curses.stdscr;
curses.setCursor(0);
scr.addstr("Press any key to continue...");
scr.refresh;
curses.update;
scr.getch;
}
If you really just briefly want getch-style input in a normal
terminal program, and still have a posix system, you can do that
with tcsetattr.
https://stackoverflow.com/questions/7469139/what-is-the-equivalent-to-getch-getche-in-linux
struct Terminal {
import core.stdc.stdio: getchar;
import core.sys.posix.termios:
tcgetattr, tcsetattr, termios,
ECHO, ICANON, TCSANOW, TCSAFLUSH;
private termios last;
int getch() { return getchar(); }
int getch_once() {
raw;
auto r = getchar;
reset;
return r;
}
void raw() {
termios term;
tcgetattr(0, );
term = last;
term.c_lflag &= ~(ICANON | ECHO);
tcsetattr(0, TCSANOW, );
}
void reset() { tcsetattr(0, TCSAFLUSH, ); }
~this() { reset(); }
}
void main() {
import std.stdio: write, writeln;
Terminal term;
write("Press any key to continue:");
term.getch_once();
writeln;
}
Re: How to simulate Window's "Press any key to continue..."
On Friday, 22 November 2019 at 04:19:40 UTC, mipri wrote:
On Friday, 22 November 2019 at 04:10:23 UTC,
FireController#1847 wrote:
I'm an extreme beginner to DLang (just started using it.. oh,
an hour ago?), and I already can't figure out a, what I'd
consider, fairly simplistic thing.
This is my current code:
module DTestApp1;
import std.stdio;
int main() {
write("Press any key to continue...");
stdin.read();
return 0;
}
I am using Visual Studio to write it, and no matter what I do
I cannot get it to work. I attempted to import std.stream;,
but it said that while it could find the file, it cannot be
read. Am I using the wrong function?
For those who don't know, what I'm trying to do is pause the
program until literally any key is pressed while in the
console.
The error doesn't suggest the right replacement, but it still
tells you that the function you want isn't available:
./test.d(6): Error: no property read for type File, did you
mean std.stdio.File.readf(alias format, Data...)(auto ref Data
data) if (isSomeString!(typeof(format)))?
std.stdio's documentation is here:
https://dlang.org/phobos/std_stdio.html
and readln is a function you can use for your purpose.
stdin.readln();
Or just:
readln;
Right, but readln will only wait until the user presses the
delimiter (by default Enter/Return). I want it to wait until ANY
key is pressed, not a specific key
Re: How to simulate Window's "Press any key to continue..."
On Friday, 22 November 2019 at 04:10:23 UTC, FireController#1847
wrote:
I'm an extreme beginner to DLang (just started using it.. oh,
an hour ago?), and I already can't figure out a, what I'd
consider, fairly simplistic thing.
This is my current code:
module DTestApp1;
import std.stdio;
int main() {
write("Press any key to continue...");
stdin.read();
return 0;
}
I am using Visual Studio to write it, and no matter what I do I
cannot get it to work. I attempted to import std.stream;, but
it said that while it could find the file, it cannot be read.
Am I using the wrong function?
For those who don't know, what I'm trying to do is pause the
program until literally any key is pressed while in the console.
The error doesn't suggest the right replacement, but it still
tells you that the function you want isn't available:
./test.d(6): Error: no property read for type File, did you mean
std.stdio.File.readf(alias format, Data...)(auto ref Data data)
if (isSomeString!(typeof(format)))?
std.stdio's documentation is here:
https://dlang.org/phobos/std_stdio.html
and readln is a function you can use for your purpose.
stdin.readln();
Or just:
readln;
How to simulate Window's "Press any key to continue..."
I'm an extreme beginner to DLang (just started using it.. oh, an
hour ago?), and I already can't figure out a, what I'd consider,
fairly simplistic thing.
This is my current code:
module DTestApp1;
import std.stdio;
int main() {
write("Press any key to continue...");
stdin.read();
return 0;
}
I am using Visual Studio to write it, and no matter what I do I
cannot get it to work. I attempted to import std.stream;, but it
said that while it could find the file, it cannot be read. Am I
using the wrong function?
For those who don't know, what I'm trying to do is pause the
program until literally any key is pressed while in the console.
