[英]NCurses using backspace
您好,我有這段代碼,並且退格鍵無法正常工作
while((ch=getch())!='\n') {
++counter;
noecho();
if (ch == KEY_BACKSPACE || ch == KEY_DC || ch == 127) {
counter--;
delch();
delch();
input[counter] = '\0';
} else
{
addch(ch);
}
refresh();
沒有出現退格字符,這是我想要的,但操作未完成
如果在getch
調用之前打開echo
,則ncurses可能返回ASCII退格鍵,例如8(與\\b
相同)。 在源代碼中提到的是Solaris兼容性的功能:
/*
* If echo() is in effect, display the printable version of the
* key on the screen. Carriage return and backspace are treated
* specially by Solaris curses:
*
* If carriage return is defined as a function key in the
* terminfo, e.g., kent, then Solaris may return either ^J (or ^M
* if nonl() is set) or KEY_ENTER depending on the echo() mode.
* We echo before translating carriage return based on nonl(),
* since the visual result simply moves the cursor to column 0.
*
* Backspace is a different matter. Solaris curses does not
* translate it to KEY_BACKSPACE if kbs=^H. This does not depend
* on the stty modes, but appears to be a hardcoded special case.
* This is a difference from ncurses, which uses the terminfo entry.
* However, we provide the same visual result as Solaris, moving the
* cursor to the left.
*/
if (sp->_echo && !(win->_flags & _ISPAD)) {
chtype backup = (chtype) ((ch == KEY_BACKSPACE) ? '\b' : ch);
if (backup < KEY_MIN)
wechochar(win, backup);
}
另一種可能性是終端描述(terminfo)可能與實際終端設置(stty)不符。 在這種情況下,ncurses會返回碰巧發送的任何密鑰(是ASCII DEL / 127還是BS / 8取決於您使用的系統)。
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