c++ - Ncurses和ostream类方法？

Question

这可能是一个愚蠢的问题，但我会尝试一下。

有没有办法让类方法将 ostream 对象作为参数输出到 Ncurses 窗口？

Answer 1

首先，我们应该利用 std::streambuf。这是一个非常简单的示例，仅将 std::cout 重定向到简单的打印机

#include <streambuf>
#include <iostream>

class ncursesbuf: public std::streambuf {
public:
  ncursesbuf() {}
  virtual int overflow(int c) {
    printf("'%d'\n", c);
  }
};

class ncurses_stream : public std::ostream {
public:
  ncursesbuf tbuf_;
  std::ostream &src_;
  std::streambuf * const srcbuf_;

  ncurses_stream(std::ostream &o) : src_(o), srcbuf_(o.rdbuf()), std::ostream(&tbuf_) {
    o.rdbuf(rdbuf());
  }

  ~ncurses_stream() {
    src_.rdbuf(srcbuf_);
  }
};

int main(int argc, char **argv) {
  std::cout << "hello world\n";
  {
    ncurses_stream foo(std::cout);
    std::cout << "hello world\n";
  }
  std::cout << "back to original state\n";
  return 0;
}

然后我们可以修改它以使用 ncurses

#include <streambuf>
#include <ncurses.h>
#include <iostream>

class ncursesbuf: public std::streambuf {
public:
  ncursesbuf() {}
  virtual int overflow(int c) {
    printw("%c", c);
  }
};

class ncurses_stream : public std::ostream {
public:
  ncursesbuf tbuf_;
  std::ostream &src_;
  std::streambuf * const srcbuf_;

  ncurses_stream(std::ostream &o) : src_(o), srcbuf_(o.rdbuf()), std::ostream(&tbuf_) {
    o.rdbuf(rdbuf());
  }

  ~ncurses_stream() {
    src_.rdbuf(srcbuf_);
  }
};

int main(int argc, char **argv) {
  /* ncurses setup */
  initscr();

  ncurses_stream foo(std::cout);
  std::cout << "hello world\n";
  refresh();
  sleep(5);
  endwin();

  return 0;
}