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POC detect arrow keys with termios doesn't work well
 

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  1. POC detect arrow keys with termios doesn't work well
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    <p>I have the problem that when you press an arrow key You detect 3 input and the while loop is executed 3 times, in fact the print of the string PRINT OF DEBUG occurs three times. Why? I would that when you press a arrow key the loop is executed 1 time. How do I do it? Here the code:</p> <pre><code>#include &lt;termios.h&gt; #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;string.h&gt; #include &lt;unistd.h&gt; #include &lt;fcntl.h&gt; #define KEYCODE_R 0x43 #define KEYCODE_L 0x44 #define KEYCODE_U 0x41 #define KEYCODE_D 0x42 int main() { int c; printf("\nPRESS A ARROW\n"); while(1) { c = getch(); printf("\nPRINT OF DEBUG\n"); switch(c) { case KEYCODE_L: //rilevazione pressione freccia sinistra printf("\nLEFT\n"); break; case KEYCODE_R: printf("\nRIGHT\n"); break; case KEYCODE_U: printf("\nFORWARD\n"); break; case KEYCODE_D: printf("\nINDIETRO\n"); break; } } return 0; } int getch() { char c; struct termios before,after; tcgetattr (STDIN_FILENO, &amp;before);//STDIN_FILENO e' il File Descriptor dello stdin. Salviamo in before la configurazione attuale dello stdin memcpy(&amp;after, &amp;before, sizeof(struct termios)); after.c_lflag &amp;=~ (ICANON | ECHO); //modifichiamo la configurazione dello stadin modificando il flag c_lflag con degli or e and bit a bit after.c_cc[VMIN] = 1; after.c_cc[VTIME] = 0; tcsetattr (STDIN_FILENO, TCSANOW, &amp;after); //qui effettuiamo effettivamente le modifiche if (read (STDIN_FILENO, &amp;c, sizeof(char)) == -1) //read e' una system call, leggiamo dallo stdin { perror("\nErrore in lettura\nIl programma termina"); tcsetattr (STDIN_FILENO, TCSANOW, &amp;before); exit(-1); } tcsetattr (STDIN_FILENO, TCSANOW, &amp;before); //si ripristina la configurazione dello stdin return c; } </code></pre> <p>Thank you for the attention</p>
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    1. USJoseph Quinsey
    1. USuser1018183
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    1. COpossible duplicate of [getch and arrow codes](http://stackoverflow.com/questions/10463201/getch-and-arrow-codes)
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      1. USusr2564301
 

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