来源:MSDN
_kbhit
Checks the console for keyboard input.
int _kbhit( void );
Routine | Required Header | Compatibility |
_kbhit | <conio.h> | Win 95, Win NT |
For additional compatibility information, see Compatibility in the Introduction.
Libraries
LIBC.LIB | Single thread static library, retail version |
LIBCMT.LIB | Multithread static library, retail version |
MSVCRT.LIB | Import library for MSVCRT.DLL, retail version |
Return Value
_kbhit returns a nonzero value if a key has been pressed. Otherwise, it returns 0.
Remarks
The _kbhit function checks the console for a recent keystroke. If the function returns a nonzero value, a keystroke is waiting in the buffer. The program can then call _getch or _getche to get the keystroke.
Example
/* 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();}
Output
Hit me!! Hit me!! Hit me!! Hit me!! Hit me!! Hit me!! Hit me!!Key struck was 'q'