怎么能获取回车输入啊？
怎么能获取回车输入啊？Return values for user-input functions
Code
Description
RTNORM
User entered a valid value
RTERROR
The function call failed
RTCAN
User entered ESC
RTNONE
User entered only ENTER
RTREJ
AutoCAD rejected the request as invalid
RTKWORD
User entered a keyword or arbitrary text
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