刷新行为(nCurses) [英] Refresh Behaviour (nCurses)

问题描述

我最近正在研究ncurses，一个疑问刚好打了我:刷新功能到底能做什么?

I recently was studying ncurses and a doubt just hit me: What EXACTLY does the refresh function does?

我进行了一些搜索，阅读了一些教程，甚至是一个文档，我的结论是它以缓冲屏幕"上完成的格式刷新"了实际屏幕(它只是更新屏幕上的输出).

I searched a little about it, read some tutorials and even a documentation and my conclusion was that it "refreshes" the actual screen with the format done on the "buffer screen" (it just updates the output on the screen).

进行一些测试后，我清楚地意识到我是错的，因为显示的输出带有或不带有刷新功能！下面有一个简单的程序，我只是对其进行测试而无法实现此功能的实际功能.

Doing some tests I clearly realized I was wrong since the output appeared with and without the refresh function! Below there's a simple program I did just to test it and I can't realize the actual functionality of this function.

#include <ncurses.h>
#include <string.h>

int main() {
  char mesg[] = "Just a String";
  int row, col;

  initscr();
  getmaxyx(stdscr, row, col);

  while(true) {
    refresh();
    mvprintw(row/2, (col - strlen(mesg))/2, "%s", mesg);

    mvprintw(row-2, 0, "This screen has %d rows and %d columns\n", row, col);

    char c = getch();
    if (c == 'e') { row++; }
    else if (c == 'q') { row--; }
    else if (c == 'a') { col--; }
    else if (c == 'd') { col++; }
  }

  getch();
  endwin();

  return 0;
}

我在整个程序中移动了刷新，删除了它，似乎什么都没有改变.到底是做什么的??

I moved the refresh all over the program, I removed it and nothing seems to change. What exactly it does??

推荐答案

getch 函数调用 refresh ，这可能会使您感到困惑>将移动到 refresh 的显式调用.

The getch function calls refresh, which is probably confusing you as you move the explicit call for refresh to different places.

curses函数写入虚拟屏幕(即非真实)，而 refresh 更新 physical 屏幕(真实屏幕)比较两者并进行一些小的更改(如果可能的话).

Curses functions write to a virtual screen (i.e., not real) and refresh updates the physical screen (the real one) by comparing the two and making small changes (if possible).

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