标签:按键终止while循环 直接来检测按键的信息来控制while循环 linux kbhit
如何通过另外一个事件来控制while循环以及在必要的时候使用按键控制while死循环
1、设置一个循环标志。主进程中进行循环并且在每次循环中检查循环标志决定是否继续,线程中检测按键输入后改变该标志
2、主进程中进行按键检测,线程用于循环操作,主进程检测到按键后关闭循环线程
这里我们不使用多线程的机制,直接来检测按键的信息来控制while循环,在有按键按下的时候终止while循环,即在扫描按键的时候不阻塞while循环事件。不废话直接上代码。
#include <iostream> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/socket.h> #include <netinet/in.h> #include <termios.h> #include <termio.h> #include <unistd.h> #include <sys/ioctl.h> #include <fcntl.h> #include <errno.h> #include <regex.h> #include <sys/time.h> using namespace std; static struct termio term_orig; static int kbdflgs; <span style="color: rgb(0, 130, 0); font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace; font-size: 13.63636302947998px; line-height: 15.397727012634277px; white-space: nowrap;">/* 判断是否有按键按下 */</span> int kbhit(void) { struct timeval tv; struct termios old_termios, new_termios; int error; int count = 0; tcgetattr(0, &old_termios); new_termios = old_termios; new_termios.c_lflag &= ~ICANON; new_termios.c_lflag &= ~ECHO; new_termios.c_cc[VMIN] = 1; new_termios.c_cc[VTIME] = 0; error = tcsetattr(0, TCSANOW, &new_termios); tv.tv_sec = 0; tv.tv_usec = 100; select(1, NULL, NULL, NULL, &tv); error += ioctl(0, FIONREAD, &count); error += tcsetattr(0, TCSANOW, &old_termios); return error == 0 ? count : -1; } /** * system_mode * reset the system to what it was before input_mode was * called */ void system_mode(void) { if (ioctl(0, TCSETA, &term_orig) == -1) { return; } fcntl(0, F_SETFL, kbdflgs); } /** * input_mode * set the system into raw mode for keyboard i/o * returns 0 - error * 1 - no error */ int input_mode(void) { struct termio term; if (ioctl(0, TCGETA, &term) == -1) { return 0; } (void)ioctl(0, TCGETA, &term_orig); term.c_iflag = 0; term.c_oflag = 0; term.c_lflag = 0; term.c_cc[VMIN] = 1; term.c_cc[VTIME] = 0; if (ioctl(0, TCSETA, &term) == -1) { return 0; } kbdflgs = fcntl(0, F_GETFL, 0); int flags = fcntl(0, F_GETFL); flags &= ~O_NDELAY; fcntl(0, F_SETFL, flags); return 1; } /** * getch * read a single character from the keyboard without echo * returns: the keypress character */ int getch(void) { unsigned char ch; input_mode(); while (read(0, &ch, 1) != 1); system_mode(); return (ch); } int main() { while (!kbhit()) { cout << "chenxun is a sb" << endl; } }
linux下模拟按键kbhit(),检测按键终止while(1)死循环
标签:按键终止while循环 直接来检测按键的信息来控制while循环 linux kbhit
原文地址:http://blog.csdn.net/chenxun_2010/article/details/41961981