ncurses: strange line formatting

问题

I have this code to work with ncurses:

#include <iostream>
#include <string>
#include <fstream>
#include <ncurses.h>
#include <cstdlib>

//char a='a';
int c=0;

bool ex = false;

void mva()
{
    std::cout << "Nothing here yet, move along." << std::endl;
}

void cho()
{
    std::cout << "Choose a valid option noob!" << std::endl;
}

void menu()
{
    std::cout << "Welcome." << std::endl;
    std::cout << "Choose an option" << std::endl;
    std::cout << "1." << std::endl;
    std::cout << "2." << std::endl;
    std::cout << "3." << std::endl;
    std::cout << "4. About" << std::endl;
    std::cout << "5. exit" << std::endl;
}

void pause()
{
    std::cin.get();
    std::cin.ignore();
}

int main()
{
    initscr();
    //clear();
    refresh();
    //system("clear");
    while (ex != true)
    {
        menu();
        std::cin >> c;
        switch (c)
        {
            case 1:
                mva();
                pause();
                system("clear"); //unfortunately, there is no clean variant to this :(
            break;

            case 2:
                mva();
                pause();
            break;

            case 3:
                mva();
                pause();
            break;

            case 4:
                std::cout << "About" << std::endl;
                std::cout << "Programmed by nnmjywg." << std::endl;
                pause();
            break;

            case 5:
                std::cout << "Press enter to exit" << std::endl;
                pause();
                ex = true;
            break;

            default:
                cho();
                pause();
            break;
        }
    }
    endwin();
    return 0;
}

It should work normally, but I'm absolutely baffled when I see this strange line formatting. In addition to that, I also can't see what I enter (with std::cin)

回答1:

When your program calls initscr, ncurses (actually any implementation of curses) initializes the terminal modes to allow printing carriage-return and line-feed ("newline") by themselves. Printing a line-feed will not produce a carriage-return.

But iostream's endl is just a line-feed. When you print to cout in that way, you'll see staircasing.

When using curses, cout and cin are not really useful. Use getch (or wgetch) to read input. Also, use the curses echo (or noecho) to control whether those echo the input which you give to getch. The curses echo has no effect on cin (the terminal likewise has been set to not echo input, and curses knows when to echo).