In the following code something strange happens ! If I keep pressed any
of ALT+Arrow, keys, they are extracted two times from buffer then getch
seems to stop; if I release and press again ALT+arrow nothing changes:
the only way to exit from this condition is press another key a single
time.
What seems to happen is that kbhit say some keys are present in buffer
but for getch don't see any data and waits for a key. Why this happen ?
If I remove the delay all is working correctly. I've inserted a delay
to reproduce thi problem that I've found on another bigger project
where loop delay is 155ms.
Last thing: I've verified this problem only on newer motherboards !
Please help me !!
Thank you.
Simone
#include <stdio.h>
#include <dpmi.h>
int Handle()
{
int vv;
int lo, hi;
__dpmi_regs reg;
reg.x.ax = 0x10 << 8; /* shift 10h into AH */
__dpmi_int( 0x16, ®);
vv= reg.x.ax ;
lo = vv & 0X00FF;
hi= ( vv & 0XFF00) >8;
vv=( ((lo == 0)|(lo == 224)) ? hi+256 : lo);
return vv;
} // Handle
int main(void)
{
int i;
do
{
i=0;
while(kbhit())
{
fprintf(stdout, "i=%d\n",i+ +);
fprintf(stdout, "%c\n",getch()) ;
}
fprintf(stdout, "%d\n",Handle() );
delay(155);
} while(1);
}
45  3332 
simnav wrote:
In the following code something strange happens ! If I keep pressed any
of ALT+Arrow, keys, they are extracted two times from buffer then getch
seems to stop; if I release and press again ALT+arrow nothing changes:
the only way to exit from this condition is press another key a single
time.
What seems to happen is that kbhit say some keys are present in buffer
but for getch don't see any data and waits for a key. Why this happen ?
If I remove the delay all is working correctly. I've inserted a delay
to reproduce thi problem that I've found on another bigger project
where loop delay is 155ms.
Last thing: I've verified this problem only on newer motherboards !
Please help me !!
Thank you.
Simone
#include <stdio.h>
#include <dpmi.h>
int Handle()
{
int vv;
int lo, hi;
__dpmi_regs reg;
reg.x.ax = 0x10 << 8; /* shift 10h into AH */
__dpmi_int( 0x16, ®);
vv= reg.x.ax ;
lo = vv & 0X00FF;
hi= ( vv & 0XFF00) >8;
vv=( ((lo == 0)|(lo == 224)) ? hi+256 : lo);
return vv;
} // Handle
int main(void)
{
int i;
do
{
i=0;
while(kbhit())
{
fprintf(stdout, "i=%d\n",i+ +);
fprintf(stdout, "%c\n",getch()) ;
}
fprintf(stdout, "%d\n",Handle() );
delay(155);
} while(1);
}
getch() probably expects an ASCII character, not just some
keyboard key
jacob navia said:
simnav wrote:
<snip>
>What seems to happen is that kbhit say some keys are present in buffer
but for getch don't see any data and waits for a key. Why this happen ?
<snip>
>
getch() probably expects an ASCII character, not just some
keyboard key
That incorrect answer is a great example of why you should ask
platform-specific questions on a newsgroup devoted to the appropriate
platform.
--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999 http://www.cpax.org.uk
email: rjh at above domain (but drop the www, obviously)
"simnav" <nospamtnxwrite s:
In the following code something strange happens ! If I keep pressed any
of ALT+Arrow, keys, they are extracted two times from buffer then getch
seems to stop; if I release and press again ALT+arrow nothing changes:
the only way to exit from this condition is press another key a single
time.
Your article was off-topic the first three times you posted it.
It is still off-topic. Please take it to a group that discusses
getch and kbhit. I suspect you want an MS-DOS programming
newsgroup.
--
"You call this a *C* question? What the hell are you smoking?" --Kaz
On Thu, 21 Sep 2006, Richard Heathfield wrote:
jacob navia said:
>simnav wrote:
<snip>
>>What seems to happen is that kbhit say some keys are present in buffer
but for getch don't see any data and waits for a key. Why this happen ?
<snip>
>>
getch() probably expects an ASCII character, not just some
keyboard key
That incorrect answer is a great example of why you should ask
platform-specific questions on a newsgroup devoted to the appropriate
platform.
How could a sentence with the adverb ``probably'' be
incorrect? :-) FWIW, ``probably'' probably means ``with
likelihood (though not with certainty)'' (OED 1989, 1).
Tak-Shing
Tak-Shing Chan said:
On Thu, 21 Sep 2006, Richard Heathfield wrote:
>jacob navia said:
>>simnav wrote:
<snip>
>>>What seems to happen is that kbhit say some keys are present in buffer
but for getch don't see any data and waits for a key. Why this happen ?
<snip>
>>>
getch() probably expects an ASCII character, not just some
keyboard key
That incorrect answer is a great example of why you should ask
platform-specific questions on a newsgroup devoted to the appropriate
platform.
How could a sentence with the adverb ``probably'' be
incorrect? :-) FWIW, ``probably'' probably means ``with
likelihood (though not with certainty)'' (OED 1989, 1).
The probability is so low as to be not worth considering. To find out why,
ask in a newsgroup where getch() is topical.
--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999 http://www.cpax.org.uk
email: rjh at above domain (but drop the www, obviously)
On Thu, 21 Sep 2006, Richard Heathfield wrote:
Tak-Shing Chan said:
>On Thu, 21 Sep 2006, Richard Heathfield wrote:
>>jacob navia said:
simnav wrote:
<snip>
What seems to happen is that kbhit say some keys are present in buffer
but for getch don't see any data and waits for a key. Why this happen ?
<snip>
getch() probably expects an ASCII character, not just some
keyboard key
That incorrect answer is a great example of why you should ask
platform-specific questions on a newsgroup devoted to the appropriate
platform.
How could a sentence with the adverb ``probably'' be
incorrect? :-) FWIW, ``probably'' probably means ``with
likelihood (though not with certainty)'' (OED 1989, 1).
The probability is so low as to be not worth considering. To find out why,
ask in a newsgroup where getch() is topical.
Given that "conio.h" is not included in the OP's code, it
might very well behave differently from the getch() you know of.
Tak-Shing
Tak-Shing Chan said:
On Thu, 21 Sep 2006, Richard Heathfield wrote:
<snip>
>The probability is so low as to be not worth considering. To find out
why, ask in a newsgroup where getch() is topical.
Given that "conio.h" is not included in the OP's code, it
might very well behave differently from the getch() you know of.
Were it topical so to do, I would ask which one you are referring to, since
I know of several. But since it isn't, I won't. I suggest you take this up
in a newsgroup where it's topical.
--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999 http://www.cpax.org.uk
email: rjh at above domain (but drop the www, obviously)
On Thu, 21 Sep 2006, Richard Heathfield wrote:
Tak-Shing Chan said:
>On Thu, 21 Sep 2006, Richard Heathfield wrote:
<snip>
>>The probability is so low as to be not worth considering. To find out
why, ask in a newsgroup where getch() is topical.
Given that "conio.h" is not included in the OP's code, it
might very well behave differently from the getch() you know of.
Were it topical so to do, I would ask which one you are referring to, since
I know of several. But since it isn't, I won't. I suggest you take this up
in a newsgroup where it's topical.
You have completely missed my point, which is that the OP
could have been using a userland kbhit() and getch(), not the
ones provided by the implementation.
Tak-Shing
Tak-Shing Chan said:
<snip>
You have completely missed my point,
No, I haven't. You just think I have.
--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999 http://www.cpax.org.uk
email: rjh at above domain (but drop the www, obviously) This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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