text based interfaces...

This is a discussion on text based interfaces... within the C++ Programming forums, part of the General Programming Boards category; hey, id like to start writing text based interfaces - linux users - like the grub boot loader, the rhl ...

  1. #1
    Registered User xconspirisist's Avatar
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    text based interfaces...

    hey, id like to start writing text based interfaces - linux users - like the grub boot loader, the rhl kazdu system, etc... like, where you select options from a menu... but all in text mode..

    Im sorry for the extremely vague disctiption, but I dont know what they're called...

    Anyway. id like to start them, anyone know any tutorials I could follow ?

  2. #2
    The Defective GRAPE Lurker's Avatar
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    I don't use linux, but I'm guessing you just mean something like this?

    Code:
    #include <iostream>
    using namespace std;
    
    int main() {
     int i;
     cout << "1. Do Something." << endl;
     cout << "2. Do Something Else." << endl;
     cout << "3. Exit." << endl;
     cout << "Enter choice: ";
     cin >> i;
     switch(i) {
      case 1:
       cout << endl << "Choice 1" << endl;
       break;
      case 2:
       cout << endl << "Choice 2" << endl;
       break;
     }
     return 0;
    }
    Do not make direct eye contact with me.

  3. #3
    Registered User xconspirisist's Avatar
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    nah, not really. hmm, if it helps, the sort of thing im thinking of, is where you select items from a menu, but with the up and down arrow keys.. just like in the slackware install... then you tap enter to select that menu item..

    aha !! if you remember installing windows.. you use a boot cd - for xp right ? you know that text based bit at the start, you select the hdd and aggree to the liecense, copy over files from the cd to begin the install ? I want that sort of menu interface..

    I hope someone can remember that and help me explain it ?

  4. #4
    mustang benny bennyandthejets's Avatar
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    Unfortunately, since there are no standard ways to clear the screen or place the cursor at any particular point, that sort of thing becomes difficult. It's more difficult if you want the code to be portable, but then again maybe you dont want that. Supposing we have a clear screen function, here is a possiblity:
    Code:
    string items[3]={"Do something","Do something else","Quit"};
    int i;
    int currentlyselected;
    char k;
    
    do
    {
            ClearScreen();
            for (i=0;i<3;i++)
            {
                  if (i==currentlyselected)
                       cout << "* ";
                  else
                       cout << "  ";
                  cout << items[i] << endl;
            }
            cin.get() >> k;
            switch (k)
            {
            case '8':
                  if (i==0) i=2;
                  else       i--;
                  break;
    
            case '2':
                  if (i==2) i=0;
                  else       i++;
                  break;
    
            case 13:
                  break;
            default:
                  break;
            }
    } while (k!=13);
    That code was written entirely in this edit box here, so don't give me crap about it not working. It's a close approximation of how you could implement this sort of menu system. You'll have to work out how to clear the screen in Linux, I have no idea how to do it.
    benforbes@optusnet.com.au
    Microsoft Visual Studio .NET 2003 Enterprise Architect
    Windows XP Pro

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  5. #5
    The Defective GRAPE Lurker's Avatar
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    Originally posted by bennyandthejets
    That code was written entirely in this edit box here, so don't give me crap about it not working.
    Mine was too, but it works .
    You'll have to work out how to clear the screen in Linux, I have no idea how to do it.
    Safe way:
    Code:
    for(int i = 0; i < 46; i++) {
     cout << endl;
    }
    Slower, non-portable way (linux / unix only):
    Code:
    system("clear");
    Do not make direct eye contact with me.

  6. #6
    and the hat of wrongness Salem's Avatar
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    > where you select options from a menu... but all in text mode..
    ncurses has additional sub-libraries like 'menu' which make this a lot easier to do
    Gory details
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  7. #7
    Me -=SoKrA=-'s Avatar
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    Just to add to Slem's reply, the ncurses programming HOWTO is here,
    which I'm finding more useful as a tutorial than the other one.
    SoKrA-BTS "Judge not the program I made, but the one I've yet to code"
    I say what I say, I mean what I mean.
    IDE: emacs + make + gcc and proud of it.

  8. #8
    Cat without Hat CornedBee's Avatar
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    For simpler interfaces than those made with curses libraries, GNU readline offers functionality for command-line clients such as command history.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

  9. #9
    Registered User xconspirisist's Avatar
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    I dont have nclasses.h ...

    Any thingelse I can use ?

    I'd like to write my own header - but two things are stopping me, first, I need a tutorial on header files, second, I dont know how to do color coding - im using unix.

  10. #10
    and the hat of wrongness Salem's Avatar
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    > I dont have nclasses.h ...
    Huh, I thought we were all talking about ncurses.h

    You must have a pretty lame unix if you don't have curses installed.
    Have you considered downloading the ncurses package for your particular flavour of unix.

    By the way, saying unix is even worse than saying windows, since there are so many more versions which come under the umbrella term 'unix'
    Be specific!!
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  11. #11
    Registered User xconspirisist's Avatar
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    I meant nCURSES.h, typo. Im using Linux, Fedora Core 1, with the Anjuta IDE.


    Code:
    //#include <curses.h> 
    #include <ncurses.h>
    
    int main()
    {	
    	initscr();			/* Start curses mode 		  */
    	printw("Hello World !!!");	/* Print Hello World		  */
    	refresh();			/* Print it on to the real screen */
    	getch();			/* Wait for user input */
    	endwin();			/* End curses mode		  */
    
    	return 0;
    }

    Using this code, it compiles okey, but I get ' undefined refernece to varaible 'initscr' line 6 ' while building..

  12. #12
    and the hat of wrongness Salem's Avatar
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    > Using this code, it compiles okey, but I get ' undefined refernece to varaible 'initscr' line 6 ' while building..
    Oh right, now you should have said so before!!!

    Code:
    gcc prog.c -lcurses
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  13. #13
    Rez
    Rez is offline
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    Try looking at my text-based GUI program. This one's for DOS (and Windows) though.
    Attached Files Attached Files

  14. #14
    Registered User xconspirisist's Avatar
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    does anyone know how to add ' -lcurses ' to the compile in the Anjuta IDE ?

  15. #15
    Registered User Mr_Jack's Avatar
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    rez, how did you do that??? Could you post the source please?

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