怎样实现组合键以表示输入文本的结束?

rshy11

例如CTRL+A,

realtang

为什么一定要用组合键呢。ansi里面的32个控制字符0－31能否加以利用呢？
NUL (null)                  
SOH (start of heading)      
STX (start of text)         
ETX (end of text)            
EOT (end of transmission) - Not the same as ETB   
ENQ (enquiry)               
ACK (acknowledge)            
BEL (bell) - Caused teletype machines to ring a bell.  Causes a beep
             in many common terminals and terminal emulation programs.
BS  (backspace) - Moves the cursor (or print head) move backwards (left)
                  one space.
TAB (horizontal tab) - Moves the cursor (or print head) right to the next
                       tab stop.  The spacing of tab stops is dependent
                       on the output device, but is often either 8 or 10.
LF  (NL line feed, new line) - Moves the cursor (or print head) to a new
                               line.  On Unix systems, moves to a new line
                               AND all the way to the left.
VT  (vertical tab)           
FF  (form feed) - Advances paper to the top of the next page (if the
                  output device is a printer).
CR  (carriage return) - Moves the cursor all the way to the left, but does
                        not advance to the next line.
SO  (shift out) - Switches output device to alternate character set.            
SI  (shift in)  - Switches output device back to default character set.
DLE (data link escape)      
DC1 (device control 1)      
DC2 (device control 2)      
DC3 (device control 3)      
DC4 (device control 4)      
NAK (negative acknowledge)   
SYN (synchronous idle)      
ETB (end of transmission block) - Not the same as EOT  
CAN (cancel)                 
EM  (end of medium)  
SUB (substitute)            
ESC (escape)
FS  (file separator)
GS  (group separator)
RS  (record separator)
US  (unit separator)

realtang

这些控制字符对应的键盘输入如下：
The value for CTRL-A (^A) is 01. The value for CTRL-Z (^Z), which is often used as an end-of-file marker in DOS is 26 (decimal). All the other CTRL-B through CTRL-Y characters fall in between. (CTRL-B is 2, CTRL-C is 3, and so forth.)

kj501

文件结束标志，在操作系统中用EOF表示。linux下在终端输入Ctrl+D，可以向当前进程发出EOF。表示结束。
各个终端可以会有差异。

rshy11

明白!3Q