C question: How do you accept an input before enter is pressed

[epb613]

Normally using scanf, when a user inputs a character, C doesn't register the fact until after they also press enter.

Is there a way to register the keypress immediatly?

Thanks in advance.

[ech0]

Normally using scanf, when a user inputs a character, C doesn't register the fact until after they also press enter.

Is there a way to register the keypress immediatly?

Thanks in advance.

use getchar()

http://goforit.unk.edu/cprogram/c_030.htm

[epb613]

No dice; it still waits for enter.

I did find this though: http://faq.cprogramming.com/cgi-bin/smartfaq.cgi?answer=1045691686&id=1043284392
Doesn't help me so much, but interesting nonetheless.

Thanks anyhow.

[epb613]

Haha I found it! After hours of searching... http://cboard.cprogramming.com/showthread.php?t=27714




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

int mygetch( ) {
struct termios oldt,
newt;
int ch;
tcgetattr( STDIN_FILENO, &oldt );
newt = oldt;
newt.c_lflag &= ~( ICANON | ECHO );
tcsetattr( STDIN_FILENO, TCSANOW, &newt );
ch = getchar();
tcsetattr( STDIN_FILENO, TCSANOW, &oldt );
return ch;
}

[ironfistchamp]

Sorry for bringing this back from the grave but I am having serious problems with the code from the link.

If I use it twice in a function it seems to break. I had problems that if I used cin >> varname; to get a line of code it would interpret the ending \n as the input for the mygetch() function. Now that I use getline(cin, varname) the second mygetch call doesn't work.

Source code included



#include <iostream>
#include <stdio.h>
#include <string>
#include "character.h"
#include "miscfunc.h"

using namespace std;

void Character::print_stats() {
cout << "Name: " << c_name <<endl;
cout << "Class: " << c_class <<endl;
cout << "Strength: " << stren <<endl;
cout << "Intelligence: "<< intel <<endl;
cout << "Dexterity: " << dexte <<endl;
cout << "Endurance: " << endur <<endl;
};


void Character::define_char() {
// define variables
string choice_name;
string choice_class;
string accept;

//start loop (easy to repeat if they make a mistake)
while (true) {

// put instructions on screen
cout << "Please choose a name for your character." <<endl;
cout << "Name: ";

// get the characters name
getline(cin, choice_name);
cout << "Please choose a class for your character." <<endl;
cout << "[w] Warrior" <<endl;
cout << "[m] Mage" <<endl;
cout << "[a] Assassin" <<endl;
cout << "[p] Priest" <<endl;
cout << "> ";

// use mygetch to get single character... if I use getline above THIS one works fine
choice_class = mygetch();


if (choice_class == "w") {
choice_class = "warrior";
};

if (choice_class == "m") {
choice_class = "mage";
};

if (choice_class == "a") {
choice_class = "assassin";
};

if (choice_class == "p") {
choice_class = "priest";
};

cout << "Name: " << choice_name <<endl;
cout << "Class: " << choice_class <<endl;
cout << "Are these values correct? [Y/n]";

// this time mygetch will no work. The first time a key is pressed nothing happens
// the second time it is pressed it will echo the key that was pressed.
accept = mygetch();

if (accept != "n") {
break;
};
};
};


I get no compilation errors at all and everything runs fine apart from the error mentioned above.

Thanks

Ironfistchamp