read_charT_read_charReadCharReadCharread_char (算子)

名称

read_charT_read_charReadCharReadCharread_char — 从窗口读取字符。

签名

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)

执行信息

• 多线程类型：可重入（与非独占算子并行运行）。
• 多线程作用域：全局（可从任何线程调用）。
• 未采用并行化处理。

参数

结果

read_charread_charReadCharReadCharReadCharread_char returns 2 ( H_MSG_TRUE) if the window is valid.否则将抛出异常。

可能的前趋

open_windowopen_windowOpenWindowOpenWindowOpenWindowopen_window, set_fontset_fontSetFontSetFontSetFontset_font

替代

read_stringread_stringReadStringReadStringReadStringread_string, fread_charfread_charFreadCharFreadCharFreadCharfread_char, fread_stringfread_stringFreadStringFreadStringFreadStringfread_string

另见

write_stringwrite_stringWriteStringWriteStringWriteStringwrite_string, set_fontset_fontSetFontSetFontSetFontset_font

模块

基础