C language getch of function details and simple examples

The getch() function in C language

Preface:

This function is a non-echo function, when the user presses a character, the function automatically read, do not need to press enter, some C language command line program will use this function to play games, but this function is not a standard function, to pay attention to portability!

So there is such an interface, it is very niuobu, at least can make a game to play, combined with ASCII code, it is easy to write a direction key control 2048 or snake and other interesting games.

Here is a simple example:

You will find that when you press the corresponding button it will print the corresponding statement.

#include <stdio.h> 
#include <fcntl.h> 
#include <stdlib.h> 
#include <conio.h> 
#define ESC       0x1B 
#define ENTER      0x0D 
#define SPACE      0x20 
#define KEY_UP     72  // on  
#define KEY_DOWN    80  // Under the   
#define KEY_LEFT    75  // On the left   
#define KEY_RIGHT    77  // right  
 
int KEY_EXIT_STATU = 0 ; 
int KEY_ENTER_STATU = 0 ;  
int KEY_SPACE_STATU = 0 ;  
 
int KEY_UP_STATU =   0 ;  
int KEY_DOWN_STATU =  0 ;  
int KEY_LEFT_STATU =  0 ;  
int KEY_RIGHT_STATU = 0 ;  
 
char ch ;  
 
int get_value() ; 
int main(void) 
{ 
 
  int i = 0; 
  while(1)  
  { 
    get_value(); 
  } 
  return 0 ;  
} 
 
int get_value() 
{ 
  ch = getch() ; 
  system("cls"); 
  switch(ch) 
  { 
      case ESC : KEY_EXIT_STATU = 1 ;       
            printf(" exit \n") ; break ;  
      case ENTER :KEY_ENTER_STATU = 1 ;       
            printf(" enter \n") ; break ;  
      case SPACE :  
            KEY_SPACE_STATU = 1 ;       
            printf(" The blank space \n") ; break ;  
      case KEY_UP:case 'w' :  
            KEY_UP_STATU = 1 ; 
            printf(" on \n") ; break ; 
      case KEY_DOWN:case 's' : 
            KEY_DOWN_STATU = 1 ;  
            printf(" Under the \n") ; break ; 
      case KEY_LEFT:case 'a' : 
            KEY_LEFT_STATU = 1 ; 
            printf(" On the left \n") ; break ; 
      case KEY_RIGHT:case 'd': 
            KEY_RIGHT_STATU = 1 ; 
            printf(" right \n") ; break ; 
  } 
} 

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