Python • Re: Entering digits without pressing "Enter'

Code:

1. Download the two programs below:   C code key.c   Python code getkey.py2. Compile the C code    gcc key.c -o key3. Run the Python code (may or may not need sudo)    sudo python3 getkey.py

Code:

#include <stdlib.h>#include <stdio.h>#include <unistd.h>#include "termios.h"int main(int argc,char *argv[])  {  int n,cmd,len;  unsigned char c;  struct termios tattr;  FILE *stream;  unsigned char *cp;  if(argc == 2)    cmd = argv[1][0];  else    return(0);  cp = (unsigned char*)&tattr;  len = sizeof(tattr);      if(cmd == '0')  // switch to single key mode    {      // Save the terminal attributes so we can restore them later    tcgetattr(STDIN_FILENO, &tattr);    stream = fopen("/tmp/term.dat","wb");    if(stream == NULL)      return(0);    for(n = 0 ; n < len ; ++n)      fputc(cp[n],stream);    fclose(stream);          /* Set the terminal modes. */    tattr.c_lflag &= ~(ICANON|ECHO|ISIG|ECHONL|IEXTEN);                       tattr.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);    tattr.c_oflag = OPOST|ONLCR;       tattr.c_cflag &= ~(CSIZE | PARENB);    tattr.c_cflag |= CS8;    tattr.c_cc[VMIN] = 0;    tattr.c_cc[VTIME] = 0;    tcsetattr(STDIN_FILENO,TCSAFLUSH,&tattr);    }  else if(cmd == '1')  // read key    {      n = read(STDIN_FILENO,&c,1);    if(n == 0)      return(0);     return(c);    }   else if(cmd == '2')  // restore original mode    {    stream = fopen("/tmp/term.dat","rb");    if(stream == NULL)      return(0);    for(n = 0 ; n < len ; ++n)      cp[n] = fgetc(stream);    fclose(stream);      tcsetattr(STDIN_FILENO,TCSANOW,&tattr);     return(0);    }  return(0);  }

Code:

import osdef getkey():  os.system('key 0')     # switch mode  key = 0  while(key == 0):    n = os.system('key 1')    # read key    key = n >> 8  os.system('key 2')    # restore mode  if(key == 3):    exit(0)   # CTL-C press  return(key)  print("Press any key - prints ASCII code (press x to exit)")key = 0while(key != 120):  key = getkey()  print(key)