I was trying to use writef("Escape string" ~ "Display string") to simulate a full-screen console.  But writef doesn't seem to flush until a newline entered (which disturbs cursor position).

I would have expected a 'flush()' function, but 'flush()' itself produces an error (does not exist), and 'fflush()' seems to be for file use, not for writing to a screen (stdio).

Please, how do I force a flush to stdio?

On 04/01/2013 11:37 AM, DLearner wrote:
> I was trying to use writef("Escape string" ~ "Display string") to
> simulate a full-screen console.  But writef doesn't seem to flush until
> a newline entered (which disturbs cursor position).
>
> I would have expected a 'flush()' function, but 'flush()' itself
> produces an error (does not exist), and 'fflush()' seems to be for file
> use, not for writing to a screen (stdio).
>
> Please, how do I force a flush to stdio?

writef is a shorthand for stdout.writef because stdout is actually a FILE, so stdout.flush() should work.

Ali

On Monday, 1 April 2013 at 18:44:16 UTC, Ali Çehreli wrote:
> On 04/01/2013 11:37 AM, DLearner wrote:
>> I was trying to use writef("Escape string" ~ "Display string") to
>> simulate a full-screen console.  But writef doesn't seem to flush until
>> a newline entered (which disturbs cursor position).
>>
>> I would have expected a 'flush()' function, but 'flush()' itself
>> produces an error (does not exist), and 'fflush()' seems to be for file
>> use, not for writing to a screen (stdio).
>>
>> Please, how do I force a flush to stdio?
>
> writef is a shorthand for stdout.writef because stdout is actually a FILE, so stdout.flush() should work.
>
> Ali

I tried this but got:
"No property 'flush' for type '_iobuf'"

Sorry but please note I also posted to the GDC forum - the non-return from the anti-spam delay made me think this posting had failed.

On Mon, Apr 01, 2013 at 08:53:40PM +0200, DLearner wrote:
> On Monday, 1 April 2013 at 18:44:16 UTC, Ali Çehreli wrote:
> >On 04/01/2013 11:37 AM, DLearner wrote:
> >>I was trying to use writef("Escape string" ~ "Display string") to
> >>simulate a full-screen console.  But writef doesn't seem to flush
> >>until a newline entered (which disturbs cursor position).
> >>
> >>I would have expected a 'flush()' function, but 'flush()' itself
> >>produces an error (does not exist), and 'fflush()' seems to be for
> >>file use, not for writing to a screen (stdio).
> >>
> >>Please, how do I force a flush to stdio?
> >
> >writef is a shorthand for stdout.writef because stdout is actually a FILE, so stdout.flush() should work.
> >
> >Ali
> 
> I tried this but got:
> "No property 'flush' for type '_iobuf'"

Did you import std.stdio? I tried the following and it works:

	import std.stdio;
	void main() {
		write("abc");
		stdout.flush();
	}

Do you have a code snippet that you're having trouble with, so that we can look at it more carefully? It's a bit hard to tell what your problem might be without seeing the actual code.


> Sorry but please note I also posted to the GDC forum - the non-return from the anti-spam delay made me think this posting had failed.

This forum (d-learn) is the correct forum for posting questions about
learning D. The GDC forum is for discussions specific to the GDC
compiler (building the GDC compiler, bugs/issues with GDC, etc.).


T

-- 
The best compiler is between your ears. -- Michael Abrash

On Monday, 1 April 2013 at 19:01:07 UTC, H. S. Teoh wrote:
> On Mon, Apr 01, 2013 at 08:53:40PM +0200, DLearner wrote:
>> On Monday, 1 April 2013 at 18:44:16 UTC, Ali Çehreli wrote:
>> >On 04/01/2013 11:37 AM, DLearner wrote:
>> >>I was trying to use writef("Escape string" ~ "Display string") to
>> >>simulate a full-screen console.  But writef doesn't seem to flush
>> >>until a newline entered (which disturbs cursor position).
>> >>
>> >>I would have expected a 'flush()' function, but 'flush()' itself
>> >>produces an error (does not exist), and 'fflush()' seems to be for
>> >>file use, not for writing to a screen (stdio).
>> >>
>> >>Please, how do I force a flush to stdio?
>> >
>> >writef is a shorthand for stdout.writef because stdout is actually
>> >a FILE, so stdout.flush() should work.
>> >
>> >Ali
>> 
>> I tried this but got:
>> "No property 'flush' for type '_iobuf'"
>
> Did you import std.stdio? I tried the following and it works:
>
> 	import std.stdio;
> 	void main() {
> 		write("abc");
> 		stdout.flush();
> 	}
>
> Do you have a code snippet that you're having trouble with, so that we
> can look at it more carefully? It's a bit hard to tell what your problem
> might be without seeing the actual code.
>
>
>> Sorry but please note I also posted to the GDC forum - the non-return
>> from the anti-spam delay made me think this posting had failed.
>
> This forum (d-learn) is the correct forum for posting questions about
> learning D. The GDC forum is for discussions specific to the GDC
> compiler (building the GDC compiler, bugs/issues with GDC, etc.).
>
>
> T

I tried your example, getting four error messages first of which was
'undefined identifier write, did you mean function fwrite?'.
I am using GDC as provided with Debian 6.0.7, and my usual D write-functions are writef and writefln.

On 04/01/2013 01:06 PM, DLearner wrote:> On Monday, 1 April 2013 at 19:01:07 UTC

> I tried your example, getting four error messages first of which was
> 'undefined identifier write, did you mean function fwrite?'.
> I am using GDC as provided with Debian 6.0.7, and my usual D
> write-functions are writef and writefln.

Is that a very old gdc, lined up perhaps with D1? Please try the latest version of dmd as well:

  http://dlang.org/download.html

Ali

Am Mon, 01 Apr 2013 13:26:53 -0700
schrieb Ali Çehreli <acehreli@yahoo.com>:

> On 04/01/2013 01:06 PM, DLearner wrote:> On Monday, 1 April 2013 at 19:01:07 UTC
> 
>  > I tried your example, getting four error messages first of which
>  > was 'undefined identifier write, did you mean function fwrite?'.
>  > I am using GDC as provided with Debian 6.0.7, and my usual D
>  > write-functions are writef and writefln.
> 
> Is that a very old gdc, lined up perhaps with D1? Please try the latest version of dmd as well:
> 
>    http://dlang.org/download.html
> 
> Ali
> 

Looks like version 1.060: http://packages.debian.org/squeeze/gdc-4.3

So it's really quite outdated considering we don't even officially support D1 anymore.

On Monday, 1 April 2013 at 20:32:25 UTC, Johannes Pfau wrote:
> Am Mon, 01 Apr 2013 13:26:53 -0700
> schrieb Ali Çehreli <acehreli@yahoo.com>:
>
>> On 04/01/2013 01:06 PM, DLearner wrote:> On Monday, 1 April 2013 at 19:01:07 UTC
>> 
>>  > I tried your example, getting four error messages first of which
>>  > was 'undefined identifier write, did you mean function fwrite?'.
>>  > I am using GDC as provided with Debian 6.0.7, and my usual D
>>  > write-functions are writef and writefln.
>> 
>> Is that a very old gdc, lined up perhaps with D1? Please try the
>> latest version of dmd as well:
>> 
>>    http://dlang.org/download.html
>> 
>> Ali
>> 
>
> Looks like version 1.060:
> http://packages.debian.org/squeeze/gdc-4.3
>
> So it's really quite outdated considering we don't even officially
> support D1 anymore.

For the record, the suggestion made from the GDC list of:

fflush(stdout);

worked.

But of course I will now have to try to load a more recent D compiler.