read_charT_read_charReadCharReadCharread_char (算子名称)

名称

read_charT_read_charReadCharReadCharread_char — Read a character from a window.

参数签名

read_char( : : WindowHandle : Char, Code)

描述

read_charread_charReadCharReadCharReadCharread_char reads a character from the keyboard in the input window (= output window). If the character is printable it is returned in CharCharCharCharcharValchar. If a control key has been pressed, this will be indicated by the value of CodeCodeCodeCodecodecode. Some important keys are recognizable by this value. Possible values are:

'character':: printable character
'left':: cursor left
'right':: cursor right
'up':: cursor up
'down':: cursor down
'insert':: insert
'none':: none of these keys
'canceled':: read_charread_charReadCharReadCharReadCharread_char has been canceled (Windows only)

运行信息

Multithreading type: reentrant (runs in parallel with non-exclusive operators).
Multithreading scope: global (may be called from any thread).
Processed without parallelization.

参数表

WindowHandleWindowHandleWindowHandleWindowHandlewindowHandlewindow_handle (input_control) window → (handle)

Window handle.

CharCharCharCharcharValchar (output_control) string → (string)

Input character (if it is not a control character).

CodeCodeCodeCodecodecode (output_control) string → (string)

Code for input character.

结果

read_charread_charReadCharReadCharReadCharread_char returns 2 ( H_MSG_TRUE) if the window is valid. Otherwise an exception is raised.

可能的前置算子

open_windowopen_windowOpenWindowOpenWindowOpenWindowopen_window, set_fontset_fontSetFontSetFontSetFontset_font

可替代算子

read_stringread_stringReadStringReadStringReadStringread_string, fread_charfread_charFreadCharFreadCharFreadCharfread_char, fread_stringfread_stringFreadStringFreadStringFreadStringfread_string

参考其它

write_stringwrite_stringWriteStringWriteStringWriteStringwrite_string, set_fontset_fontSetFontSetFontSetFontset_font

模块

Foundation