1
while(ch != 'q') 
{
  printf("looping\n");
  sleep(1);
  if(kbhit()) 
   {
    ch = readch();
    printf("you hit %c\n",ch);
   }
}

このコードは私に機能のようなブロッキングgetch()を与えます。このコードを使用して、上矢印キーをキャプチャしようとしています。

追加: 上矢印のキーコードをキャプチャしようとすると、27、91、65文字の3文字が表示されます。if/ elseを使用すると、パターンマッチングを試行していますが、2文字しか取得できません。次のキーが押されると、次のキーがキャプチャされます。

常に特定のキー(esc、delなど)を探しながら、getchar()を使用して完全な単語をキャプチャしたいと思います。

4

2 に答える 2

3

私はあなたの問題を再現できません:

#include <unistd.h> 
#include <stdio.h> 
#include <ctype.h> 

#include "kbhit.h" /* http://linux-sxs.org/programming/kbhit.html */

int main(){
  init_keyboard();
  char ch='x';
  while( ch != 'q' ){
    printf("looping\n");
    sleep(1);
    if( kbhit() ){
      printf("you hit");
      do{
        ch = readch();
        printf(" '%c'(%i)", isprint(ch)?ch:'?', (int)ch );
      }while( kbhit() );
      puts("");
    }
  }
  close_keyboard();
}
于 2009-10-03T14:13:34.817 に答える
1

この例は次の場合に役立ちます。

raw.c-rawモードのデモンストレーション

/* Raw mode demo */
/* See exactly what is being transmitted from the terminal. To do this
   we have to be more careful. */

#include <stdio.h>
#include <signal.h>
#include <termios.h>
#include <stdlib.h>
#include <unistd.h>

struct termios oldtermios;

int ttyraw(int fd)
{
    /* Set terminal mode as follows:
       Noncanonical mode - turn off ICANON.
       Turn off signal-generation (ISIG)
        including BREAK character (BRKINT).
       Turn off any possible preprocessing of input (IEXTEN).
       Turn ECHO mode off.
       Disable CR-to-NL mapping on input.
       Disable input parity detection (INPCK).
       Disable stripping of eighth bit on input (ISTRIP).
       Disable flow control (IXON).
       Use eight bit characters (CS8).
       Disable parity checking (PARENB).
       Disable any implementation-dependent output processing (OPOST).
       One byte at a time input (MIN=1, TIME=0).
    */
    struct termios newtermios;
    if(tcgetattr(fd, &oldtermios) < 0)
        return(-1);
    newtermios = oldtermios;

    newtermios.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
    /* OK, why IEXTEN? If IEXTEN is on, the DISCARD character
       is recognized and is not passed to the process. This 
       character causes output to be suspended until another
       DISCARD is received. The DSUSP character for job control,
       the LNEXT character that removes any special meaning of
       the following character, the REPRINT character, and some
       others are also in this category.
    */

    newtermios.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
    /* If an input character arrives with the wrong parity, then INPCK
       is checked. If this flag is set, then IGNPAR is checked
       to see if input bytes with parity errors should be ignored.
       If it shouldn't be ignored, then PARMRK determines what
       character sequence the process will actually see.

       When we turn off IXON, the start and stop characters can be read.
    */

    newtermios.c_cflag &= ~(CSIZE | PARENB);
    /* CSIZE is a mask that determines the number of bits per byte.
       PARENB enables parity checking on input and parity generation
       on output.
    */

    newtermios.c_cflag |= CS8;
    /* Set 8 bits per character. */

    newtermios.c_oflag &= ~(OPOST);
    /* This includes things like expanding tabs to spaces. */

    newtermios.c_cc[VMIN] = 1;
    newtermios.c_cc[VTIME] = 0;

    /* You tell me why TCSAFLUSH. */
    if(tcsetattr(fd, TCSAFLUSH, &newtermios) < 0)
        return(-1);
    return(0);
}

int ttyreset(int fd)
{
    if(tcsetattr(fd, TCSAFLUSH, &oldtermios) < 0)
        return(-1);

    return(0);
}

void sigcatch(int sig)
{
    ttyreset(0);
    exit(0);
}

int main()
{
    int i;
    char c;

    /* Catch the most popular signals. */
    if((int) signal(SIGINT,sigcatch) < 0)
    {
        perror("signal");
        exit(1);
    }
    if((int)signal(SIGQUIT,sigcatch) < 0)
    {
        perror("signal");
        exit(1);
    }
    if((int) signal(SIGTERM,sigcatch) < 0)
    {
        perror("signal");
        exit(1);
    }

    /* Set raw mode on stdin. */
    if(ttyraw(0) < 0)
    {
        fprintf(stderr,"Can't go to raw mode.\n");
        exit(1);
    }

    while( (i = read(0, &c, 1)) == 1)
    {
        if( (c &= 255) == 0177) /* ASCII DELETE */
            break;
        printf( "%o\n\r", c);
    }

    if(ttyreset(0) < 0)
    {
        fprintf(stderr, "Cannot reset terminal!\n");
        exit(-1);
    }

    if( i < 0)
    {
        fprintf(stderr,"Read error.\n");
        exit(-1);
    }

    return 0;
}

(デモを停止するためのバックスペース、origin

于 2009-10-03T13:52:34.017 に答える