Question

我试过寻找解决方案，我只是不知道为什么窗口没有显示。代码相当简单直接。为什么会这样？我之前问了一个类似的问题，但知道一个人似乎能够提供正确的答案，所以我做了一点简单，只包括了重要的东西。

#include <ncurses.h>
#include <stdio.h>
#include <stdlib.h>


int main()
{
    initscr();
    WINDOW* win;
    int height = 10;
    int width = 40;
    int srtheight = 1;
    int srtwidth = 0;
    win = newwin(height, width, srtheight ,srtwidth);
    mvwprintw(win, height/2,width/2,"First line");
    wrefresh(win);
    getch();
    delwin(win);
    endwin();


    return 0;
}

Answer 1

你忘了打电话刷新。

基本上，你确实在新创建的窗口上调用了refresh，但是你忘了刷新父窗口，所以它永远不会刷新。

#include <ncurses.h>
#include <stdio.h>
#include <stdlib.h>

int main()
{
    WINDOW* my_win;
    int height = 10;
    int width = 40;
    int srtheight = 1;
    int srtwidth = 1;
    initscr();
    printw("first"); // added for relative positioning
    refresh();  //  need to draw the root window
                //  without this, apparently the children never draw
    my_win = newwin(height, width, 5, 5);
    box(my_win, 0, 0);  // added for easy viewing
    mvwprintw(my_win, height/2,width/2,"First line");
    wrefresh(my_win);
    getch();
    delwin(my_win);
    endwin();
    return 0;
}

按预期给出了窗口。

Answer 2

您需要在refresh()后调用newwin()：

win = newwin(height, width, srtheight ,srtwidth);
refresh(); // <<<
mvwprintw(win, height/2,width/2,"First line");

Answer 3

问题是getch刷新标准窗口stdscr，覆盖了对前一行win的刷新。如果你打电话给wgetch(win)而不是那两行，那就行了。

像这样：

#include <ncurses.h>
#include <stdio.h>
#include <stdlib.h>


int main()
{
    initscr();
    WINDOW* win;
    int height = 10;
    int width = 40;
    int srtheight = 1;
    int srtwidth = 0;
    win = newwin(height, width, srtheight ,srtwidth);
    mvwprintw(win, height/2,width/2,"First line");
    /* wrefresh(win); */
    wgetch(win);
    delwin(win);
    endwin();


    return 0;
}

进一步阅读：

Reading characters，例如wgetch

C- Ncurses，窗口不显示/打印

3 个答案: