When customizing the SECURTCRT theme, the inexplicable Chinese input all becomes the question mark character, all the solutions on the net are not valid, it is not possible to say the Linux system default encoding setting problem on the Internet, SECURTCRT has been set to UTF8 encoding.
Repeated trials, and finally found the problem lies.
Originally is a font problem, custom theme during the change of font, but that font does not support the Chinese character set, alas, is a deep hidden details ah, a few times is a glance, not carefully browse the configuration.
Specifically, be sure to select fonts that support the Chinese character set:
This italics supports the Chinese character set GB2312, which does not conflict with your Linux UTF8 default settings, where GB2312 is the input character set of the SecureCRT terminal.
This font is not supported by the Chinese character set, so when you enter Chinese in securecrt, the character becomes a question mark because the terminal tool does not recognize the Chinese language at this time.
SECURTCRT Chinese characters into question mark characters