本文介绍了移动光标在C程序的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想向前和向后移动光标在C程序。我读在一个循环的整条生产线,但我想,如果光标键获得pressed光标在屏幕上的位置变化,而不会阻塞循环。我试图 getwch()
,但它阻止,直到进入它的pressed调用者。我正在寻找的是类似bash提示符行为。我与一个类似的code阅读:
I'd like to move the cursor forward and backwards in a C program. I'm reading the whole line in a loop, but i would like that if a cursor key gets pressed the cursor on the screen changes position, without blocking the loop. I tried getwch()
but it blocks the caller until enter it's pressed. What i'm looking for is a behavior similar to bash prompt. I'm reading with a code similar to this:
while (TRUE) {
printf("%s", PROMPT);
fgets(input, 1024, stdin);
do_something(input);
}
我想,上面的函数类似于的ReadLine(提示)
在 readline.h
库
推荐答案
使用的termios
和控制台 - codeS(VT100兼容 - 不可移植):
Using termios
and console-codes (VT100 compatible - not portable):
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#define cursorforward(x) printf("\033[%dC", (x))
#define cursorbackward(x) printf("\033[%dD", (x))
#define KEY_ESCAPE 0x001b
#define KEY_ENTER 0x000a
#define KEY_UP 0x0105
#define KEY_DOWN 0x0106
#define KEY_LEFT 0x0107
#define KEY_RIGHT 0x0108
static struct termios term, oterm;
static int getch(void);
static int kbhit(void);
static int kbesc(void);
static int kbget(void);
static int getch(void)
{
int c = 0;
tcgetattr(0, &oterm);
memcpy(&term, &oterm, sizeof(term));
term.c_lflag &= ~(ICANON | ECHO);
term.c_cc[VMIN] = 1;
term.c_cc[VTIME] = 0;
tcsetattr(0, TCSANOW, &term);
c = getchar();
tcsetattr(0, TCSANOW, &oterm);
return c;
}
static int kbhit(void)
{
int c = 0;
tcgetattr(0, &oterm);
memcpy(&term, &oterm, sizeof(term));
term.c_lflag &= ~(ICANON | ECHO);
term.c_cc[VMIN] = 0;
term.c_cc[VTIME] = 1;
tcsetattr(0, TCSANOW, &term);
c = getchar();
tcsetattr(0, TCSANOW, &oterm);
if (c != -1) ungetc(c, stdin);
return ((c != -1) ? 1 : 0);
}
static int kbesc(void)
{
int c;
if (!kbhit()) return KEY_ESCAPE;
c = getch();
if (c == '[') {
switch (getch()) {
case 'A':
c = KEY_UP;
break;
case 'B':
c = KEY_DOWN;
break;
case 'C':
c = KEY_LEFT;
break;
case 'D':
c = KEY_RIGHT;
break;
default:
c = 0;
break;
}
} else {
c = 0;
}
if (c == 0) while (kbhit()) getch();
return c;
}
static int kbget(void)
{
int c;
c = getch();
return (c == KEY_ESCAPE) ? kbesc() : c;
}
int main(void)
{
int c;
while (1) {
c = kbget();
if (c == KEY_ENTER || c == KEY_ESCAPE || c == KEY_UP || c == KEY_DOWN) {
break;
} else
if (c == KEY_RIGHT) {
cursorbackward(1);
} else
if (c == KEY_LEFT) {
cursorforward(1);
} else {
putchar(c);
}
}
printf("\n");
return 0;
}
这篇关于移动光标在C程序的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!