Box passed window in ncurses.h-CodePudding

I'm having a hard time understanding the problem with a window in ncurses. I created a layout of several windows and want to have a function that will border a window. Look like this:

int main() {
    use_env(TRUE);
    initscr();
    start_color();
    cbreak();
    noecho();
    curs_set(0);

    WINDOW *win_corner = newwin(WCLINES, WCCOLS, WCX, WCY);
    choose_lvl(win_corner); 
    ...
}


int choose_lvl(WINDOW *win) {
    box(win, 0, 0);
    wrefresh(win);
    refresh();

    int c, curr_option = 0;
    init_pair(1, COLOR_CYAN, COLOR_BLACK);
    attron(COLOR_PAIR(1));
    mvwprintw(win, 1, 1, "Choose your level");
    ...
}

It seems like box() doesnt have any effect at all - what could it be? My current theory is to suppose something wrong with the coordinates of the window.

CodePudding user response：

refresh() refreshes the updates on stdscr. newwin() creates an independant window. A refresh on stdscr does not update the alternate window. The same without refresh() in choose_lvl() function would work fine as you would force update only on the alternate window.
You can also create a sub-window of stdscr with subwin() to make refresh() update the whole hierarchy:

#include <unistd.h>
#include <curses.h>

#define WCLINES 10
#define WCCOLS 80

#define WCX 4
#define WCY 4

int choose_lvl(WINDOW *win) {
    box(win, 0, 0);
    //wrefresh(win);
    //refresh();

    int c, curr_option = 0;
    init_pair(1, COLOR_CYAN, COLOR_BLACK);
    attron(COLOR_PAIR(1));
    mvwprintw(win, 1, 1, "Choose your level");

    refresh();

    return 0;
}

int main() {
    use_env(TRUE);
    initscr();
    start_color();
    cbreak();
    noecho();
    curs_set(0);

    //WINDOW *win_corner = newwin(WCLINES, WCCOLS, WCX, WCY);
    WINDOW *win_corner = subwin(stdscr, WCLINES, WCCOLS, WCX, WCY);
    choose_lvl(win_corner); 

    // quick&dirty pause to suspend program execution
    // right after the windows display
    pause();
    
    return  0;
}

Execution:

$ gcc win.c -lncurses
$ ./a.out

The result is: