Question

我试图用c ++中的ANSI转义码滚动屏幕，但我遇到了问题。我的代码是

#include <stdio.h>
#include <unistd.h>
#include <termios.h>
#include <iostream>
#include <cstdlib>

int main() {
    system("clear");
    std::cout << "Press ESC to quit" << std::endl;

    struct termios oldSettings, newSettings;

    tcgetattr(fileno(stdin), &oldSettings);
    newSettings = oldSettings;

    newSettings.c_lflag &= (~ICANON & ~ECHO);
    tcsetattr(fileno(stdin), TCSANOW, &newSettings);

    while (1) {
        char c;
        read(fileno(stdin), &c, 1);

        if (c == 27) { // ESC or arrow?
            fd_set set;
            struct timeval tv;

            tv.tv_sec = 0;
            tv.tv_usec = 0;

            FD_ZERO(&set);
            FD_SET(fileno(stdin), &set);

            int res = select(fileno(stdin) + 1, &set, NULL, NULL, &tv);

            if (res > 0) {
                read(fileno(stdin), &c, 1);

                if (c == 91) {
                    read(fileno(stdin), &c, 1);

                    switch (c) {
                        case 65:
                            std::cout << "\033[1A" << std::flush; // arrow up
                            break;

                        case 66:
                            std::cout << "\033[1B" << std::flush; // arrow down
                            break;

                        case 67:
                            std::cout << "\033M" << std::flush; // arrow right
                            break;

                        case 68:
                            std::cout << "\033D" << std::flush; // arrow left
                            break;

                        default:
                            while (res != 0) {
                                read(fileno(stdin), &c, 1);

                                fd_set set;
                                struct timeval tv;

                                tv.tv_sec = 0;
                                tv.tv_usec = 0;

                                FD_ZERO(&set);
                                FD_SET(fileno(stdin), &set);
                                res = select(fileno(stdin) + 1, &set, NULL,
                                             NULL, &tv);
                            }
                            break;
                    }
                }
            }

            else
                break; // ESC
        }
    }

    tcsetattr(fileno(stdin), TCSANOW, &oldSettings);

    system("clear");
    return 0;
}

当我按下向下箭头直到光标移到最后一行然后我按向左箭头时屏幕向下滚动（这很好），当我运行程序时。但是如果我用向上箭头向上移动光标然后我按向右箭头，写入＆＃34;按ESC退出＆＃34;不再出现。如何将屏幕向上滚动到上一行呢？

使用ANSI转义码C ++滚动

0 个答案: