program to read key press values

[srikanth123456]

can u guide me how to write this program


my program should give outputas follows

when i press a key on the keyboard it should return the "key is pressed"

and also if the key is pressed more than 350ms it should return the "key is hold"

[rajesh6695]

kbhit() is a function returns integer value whenever the key is pressed...
you can use the above function.....

Try to post the code you had written...

[srikanth123456]

ok

i tried the same
but how to do the 350 ms time gap on hold key event

[rajesh6695]

Please explain the code you want in clear....

[srikanth123456]

#include<stdio.h>
#include<conio.h>
void main()
{
printf("enter key a");
while(kbhit()='a')
{
printf("key a is pressed");
}
}
but it is saying that lvalue required i entered ascii value also .
how to get "something done" when a mentioned key is pressed

[rajesh6695]

check the while loop condition are you comparing or assiginig...
Check it.......

[willakawill]

kbhit() returns 0 if the keyboard has not been hit and a nonzero value if it has been hit. It does not return the value of the key that has been hit e.g.

/* KBHIT.C: This program loops until the user
 * presses a key. If _kbhit returns nonzero, a
 * keystroke is waiting in the buffer. The program
 * can call _getch or _getche to get the keystroke.
 */
 
#include <conio.h>
#include <stdio.h>
 
void main( void )
{
   /* Display message until key is pressed. */
   while( !_kbhit() )
      _cputs( "Hit me!! " );
 
   /* Use _getch to throw key away. */
   printf( "\nKey struck was '%c'\n", _getch() );
   _getch();
}

which is the example shown in vs6 help

[rajesh6695]

#include <stdio.h>
#include <conio.h>
#include <math.h>
#include <time.h>

int main()
{
int m;
clock_t st,end,end_out;
clrscr();
st=clock();
printf("The value of the clock is : %f\n",st/CLK_TCK);
do
{

if(kbhit())
{
if((m=getch())==97)
{
end=clock();
printf("Key a is pressed....\n");
printf("The value of the clock in sec : %f\n",end/CLK_TCK);
}
}
}while(1);
getch();
return 0;
}



I think the above code will help you understand more...Clock is used measure the time taken to complete the execution

[srikanth123456]

thanks for u r advice i got much from u r program

[dusty]

[quote=rajesh6695]#include <stdio.h>
#include <conio.h>
#include <math.h>
#include <time.h>

int main()
{
int m;
clock_t st,end,end_out;
clrscr();
st=clock();
printf("The value of the clock is : %f\n",st/CLK_TCK);
do
{

if(kbhit())
{
if((m=getch())==97)
{
end=clock();
printf("Key a is pressed....\n");
printf("The value of the clock in sec : %f\n",end/CLK_TCK);
}
}
}while(1);
getch();
return 0;
}


Hi all,

I was looking for a similar program, but when I compiled this program in linux, i got an error message which goes:

stopwatch.cpp:2:19: conio.h: No such file or directory
stopwatch.cpp: In function `int main()':
stopwatch.cpp:10: error: `clrscr' undeclared (first use this function)
stopwatch.cpp:10: error: (Each undeclared identifier is reported only once for
each function it appears in.)
stopwatch.cpp:12: error: `CLK_TCK' undeclared (first use this function)
stopwatch.cpp:16: error: `kbhit' undeclared (first use this function)
stopwatch.cpp:18: error: `getch' undeclared (first use this function)

Does conio.h is only for windows. I compiled this program in cygwin. Any help please. Thanks

[Abdur Rehman]

[quote=dusty;2395686]

#include <stdio.h>
#include <conio.h>
#include <math.h>
#include <time.h>

int main()
{
int m;
clock_t st,end,end_out;
clrscr();
st=clock();
printf("The value of the clock is : %f\n",st/CLK_TCK);
do
{

if(kbhit())
{
if((m=getch())==97)
{
end=clock();
printf("Key a is pressed....\n");
printf("The value of the clock in sec : %f\n",end/CLK_TCK);
}
}
}while(1);
getch();
return 0;
}


Hi all,

I was looking for a similar program, but when I compiled this program in linux, i got an error message which goes:

stopwatch.cpp:2:19: conio.h: No such file or directory
stopwatch.cpp: In function `int main()':
stopwatch.cpp:10: error: `clrscr' undeclared (first use this function)
stopwatch.cpp:10: error: (Each undeclared identifier is reported only once for
each function it appears in.)
stopwatch.cpp:12: error: `CLK_TCK' undeclared (first use this function)
stopwatch.cpp:16: error: `kbhit' undeclared (first use this function)
stopwatch.cpp:18: error: `getch' undeclared (first use this function)

Does conio.h is only for windows. I compiled this program in cygwin. Any help please. Thanks

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