Hi,
I am making a small software. As a part of the Command Line Interface I am supposed to include the "tab help facility" .Incase the user is typing a command and in between he presses the Tab key, the software should display all the avavilable commands.
I am unable to trap the Tab ...
And ofcourse the Coding is in C..
As you need to trap a single key, I don't think you can use getline/s().
Just catch every character typed using getchar/ch() and echo it back using putxx() if it's not the tab char.
Well a lot depends on your OS and compiler.
Are you allowed to use libraries like ncurses?
if you are using c++ we can write portable code
std::cin >> std::noskipws ;
char ch ;
std::cin >> ch ;
if( ch == '\t' ) /* ... */ ;// tab
else /* ... */ ; // something else1.I am working on LINUX
2. Using C, not C++
3I can Download extra lib if the need be.
1.I am working on LINUX
2. Using C, not C++
3I can Download extra lib if the need be.
Depends on if you want the user to press the return/enter key first. If not, you'll probably want to code with something like [search]NCurses[/search].
Depends on if you want the user to press the return/enter key first. If not, you'll probably want to code with something like [search]NCurses[/search].
I think the user doesn't press the return key.
"Incase the user is typing a command and in between he presses the Tab key, the software should display all the avavilable commands."
Kinda like word completion in shells.
Yes, I dont want the user to have to press the return key.
Can any one please explain in detail, how the Ncurses thing works...
@ kashyap.. Man I dont want the user to press the ReTURN key. I mean, the 1st method that u suggested would not work in this situation...
???
ncurses (or curses) is installed by default by
most linux distros. try man curses to check.
install ncurses-development package if
it is not already installed.
while writing code,
[B]#include <ncurses.h> [/B]// or <curses.h>
[B]int main()[/B]
[B]{
initscr() ; [/B]// must be called first[B][B]
cbreak() [/B][/B][B]// [/B]disable the buffering
// required to get a character immediately
// without waiting for return key.
[B]
noecho();[/B] // only if u want to suppress
// echo of input keys
[B] keypad(stdscr, TRUE);[/B] // only if u want
// to read special keys (delete,arrow keys etc.)
// to read a character, use
[B]int getch(void) ;
[/B] // normally [B]getch[/B] waits till a
// key is hit. to work in a
// nonblocking manner, call
[B] // nodelay(stdscr, TRUE) ;
[/B] // in this case getch will return
// [B]ERR[/B] if key input is not available.
[B]endwin()[/B] // must be called before exiting
// to restore the terminal settings.
return 0 ;
}compiling/linking:
either gcc. -lncurses your_program.c
or gcc your_program.c libncurses.a
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