nCurses getch() question

alpha_gamma · 03-04-2007, 07:42 PM

Hello,

I have begun using nCurses and am using getstr(name) to enter charaters and it is working well. However I would like to enter multi-digit numbers and tried this:

double one;
one=getch();

This only enables me to enter one character. I want to enter '22' but it only lets me enter '2'. All of the books and online resources say getch() will only grab one character.I have searched all the resources but they don't have the example I'm looking for to handle multi-digit input for one data variable. So as my last resort I am submitting my question here.

Can someone help me out and explain a way that I can enter multi-digit variables with getch() or some other nCurses function?

Thanks again,

Andrew

wjevans_7d1@yahoo.co · 03-04-2007, 08:10 PM

You want wgetstr().

If you have not already done so, do these:

Code:

man ncurses
man curs_getch
man curs_getstr

If you have not already done so, go here:

http://web.cs.mun.ca/~rod/ncurses/ncurses.html#input
http://web.cs.mun.ca/~rod/ncurses/ncurses.html

Hope this helps.

alpha_gamma · 03-04-2007, 08:39 PM

I gave it a try, g++ complained at me for passing an into for a string value. Actually this program calculates numerical values, so I can't enter the value as a string. I am looking for a way to enter the value like 'cin>>' and also seeing the numbers when entered.

tuxdev · 03-04-2007, 10:12 PM

Look at istringstream for conversion. I believe it's in the sstream header.

iamnothere · 03-06-2007, 11:54 AM

Quote:

Originally Posted by alpha_gamma

I can't enter the value as a string.

Yes, you can. If fact, that's all you can do. There is no such function as 'enter a number', you can only read characters, i.e. bytes of data. There is no distinction between digits and non-digits at the input level. Read a string, then convert it into an int/double with strtol/strtod.

spaesani · 03-06-2007, 03:26 PM

man curs_scanw

good question
looks like you stumped a few people

)
(i looked it up)
of note is that many libc functions have curses equivalents
or vice versa.
cheers
sp

alpha_gamma · 03-06-2007, 07:39 PM

Hello,

I currently have this algorithm, it only accepts 2 digits for input,

Code:

        while(bControlLoop){
	     one = getch()-'0';
	     one=one*10+getch()-'0';
	     if (!(one >= '0' && one <= '9')) bControlLoop = false;
         }

but I think I think 'iamnothere's suggestion of reading in a string and converting it to a double with strtol/strtod sounds very good. Or maybe just using scanf to get an integer, I have to look it up and apply it to my code and see how I can work it out. So far it is 300 lines of code in 9 files and I'm going to have to reformat everything to get it displaying nCurses in the terminal.

Thank you very much for your replies, I really do appreciate your help.

Andrew

spaesani · 03-07-2007, 07:30 PM

your welcome