Hi,everyone,
I am learning D.I installed a plugin-visusl D to visual studio 2008.I am very confused that ctrl+z didn't teminate the input of console,it result in a dead loop.When reading from a txt file,a extra line will be read and usually it result in a wrong result.Is there anyone who has experienced such a situation and can tell me what I should pay attention to.
Thanks a lot.
lx

lx:

> I am very confused that ctrl+z didn't teminate the input of console,it result in a dead loop.

I think this is a library bug, I noticed it some times, but I didn't file it. Maybe it's worth filing in Bugzilla.



> When reading from a txt file,a extra line will be read and usually it result in a wrong result.

Can you show the code?

Bye,
bearophile

>> I am very confused that ctrl+z didn't teminate the input of console,it result in a dead loop.
>
> I think this is a library bug, I noticed it some times, but I didn't file it. Maybe it's worth filing in Bugzilla.

I have added this bug report, is this the issue you are seeing/having?

http://d.puremagic.com/issues/show_bug.cgi?id=10467

Bye,
bearophile

On Monday, 24 June 2013 at 21:13:31 UTC, bearophile wrote:
>>> I am very confused that ctrl+z didn't teminate the input of console,it result in a dead loop.
>>
>> I think this is a library bug, I noticed it some times, but I didn't file it. Maybe it's worth filing in Bugzilla.
>
> I have added this bug report, is this the issue you are seeing/having?
>
> http://d.puremagic.com/issues/show_bug.cgi?id=10467
>
> Bye,
> bearophile

I don't think this is a bug (I replied on the bug report): terminating the stream doesn't mean terminating the program, and if the program doesn't know how to handle a closed/eof/error'd stdin, it will just loop...

This FAQ link explains it pretty well for C++, which is pretty much the same thing as in D:
http://www.parashift.com/c++-faq/stream-input-failure.html
(the next few points are relevant too).

We could argue the design isn't optimal, yes, but it's not bugged.

monarch_dodra:

> I don't think this is a bug

I see. Then lx will have to explain the problem better.


> (I replied on the bug report):

I have given an answer, comparing to Python. I think the current Phobos behavour is bad.

Bye,
bearophile

On Monday, 24 June 2013 at 21:13:31 UTC, bearophile wrote:
>>> I am very confused that ctrl+z didn't teminate the input of console,it result in a dead loop.
>>
>> I think this is a library bug, I noticed it some times, but I didn't file it. Maybe it's worth filing in Bugzilla.
>
> I have added this bug report, is this the issue you are seeing/having?
>
> http://d.puremagic.com/issues/show_bug.cgi?id=10467
>
> Bye,
> bearophile
I read those information and yes,it is the issue I am having.I should have handled it in right way.Ctrl+z seems close the stream.So,if I want to input another batch of data,it became impossilbe.So,how to reopen the stream again to allow me to input another batch of data?

And,another problem:if I input ctrl+c,the code will terminate abnormally.Why this happened?
Thanks.
lx

On 06/25/2013 09:26 PM, lx wrote:

> Ctrl+z seems close the stream.So,if I want
> to input another batch of data,it became impossilbe.So,how to reopen the
> stream again to allow me to input another batch of data?

Making a copy of stdin works on Linux (where the stream is terminated by Ctrl-D in the console):

import std.stdio;
import std.algorithm;

void main()
{
    auto stdin_dup = stdin;

    stdin
        .byLine(KeepTerminator.yes)
        .copy(stdout.lockingTextWriter);

    writeln("done");

    stdin_dup
        .byLine(KeepTerminator.yes)
        .copy(stdout.lockingTextWriter);

    writeln("done again");
}

Ali

On 06/25/2013 09:26 PM, lx wrote:

> I input ctrl+c,the code will terminate
> abnormally.Why this happened?

Ctrl-C appears as SIGINT under POSIX systems. You need to register a handler for that signal:

import std.stdio;
import std.string;
import core.sys.posix.signal;

bool isDone = false;

extern(C) void mySIGINThandler(int) nothrow @system
{
    isDone = true;
}

void main()
{
    signal(SIGINT, &mySIGINThandler);

    while (true) {
        string line = chomp(readln());

        if (stdin.eof() || isDone) {
            break;

        } else {
            writefln("Nice line: %s", line);
        }
    }
}

Ali

On Wednesday, 26 June 2013 at 04:46:32 UTC, Ali Çehreli wrote:
> On 06/25/2013 09:26 PM, lx wrote:
>
> > Ctrl+z seems close the stream.So,if I want
> > to input another batch of data,it became impossilbe.So,how to
> reopen the
> > stream again to allow me to input another batch of data?
>
> Making a copy of stdin works on Linux (where the stream is terminated by Ctrl-D in the console):
>
> import std.stdio;
> import std.algorithm;
>
> void main()
> {
>     auto stdin_dup = stdin;
>
>     stdin
>         .byLine(KeepTerminator.yes)
>         .copy(stdout.lockingTextWriter);
>
>     writeln("done");
>
>     stdin_dup
>         .byLine(KeepTerminator.yes)
>         .copy(stdout.lockingTextWriter);
>
>     writeln("done again");
> }
>
> Ali
Hi,Ali,I tried those codes,it doesn't work under win7.The result is
"done again" will follow "done",without giving me any chance to input.
lx

On Wednesday, 26 June 2013 at 13:45:41 UTC, lx wrote:
> On Wednesday, 26 June 2013 at 04:46:32 UTC, Ali Çehreli wrote:
>> On 06/25/2013 09:26 PM, lx wrote:
>>
>> > Ctrl+z seems close the stream.So,if I want
>> > to input another batch of data,it became impossilbe.So,how to
>> reopen the
>> > stream again to allow me to input another batch of data?
>>
>> Making a copy of stdin works on Linux (where the stream is terminated by Ctrl-D in the console):
>>
>> import std.stdio;
>> import std.algorithm;
>>
>> void main()
>> {
>>    auto stdin_dup = stdin;
>>
>>    stdin
>>        .byLine(KeepTerminator.yes)
>>        .copy(stdout.lockingTextWriter);
>>
>>    writeln("done");
>>
>>    stdin_dup
>>        .byLine(KeepTerminator.yes)
>>        .copy(stdout.lockingTextWriter);
>>
>>    writeln("done again");
>> }
>>
>>Ali
 Hi,Ali,I tried those codes,it doesn't work under win7.The
 result is
"done again" will follow "done",without giving me any chance to
 input again after I enter ctrl-z .
 lx