如何从smalltalk中的字符串中删除前导字符

Question

所以我在一个小谈话中有一个字符串,该字符串作为'$ 100xxxxxxZZ'来到TCP/IP连接,其中x是数字0-9或字母A-Z,ZZ是由发送者计算的校验和.使用字符串我需要计算'100xxxxxx'的校验和,以验证这是正确的消息和校验和.所以我需要能够删除'$ 100xxxxxxZZ'的'$'和'ZZ'

我已经知道如何截断'ZZ',这是我的代码:

ValidateMsg:replyWithCheckSum

|newMsg tempMsg|
"removes the 'ZZ' from '$100xxxxxxZZ'  "
tempMsg := replyWithCheckSum copyFrom: 2 to: (replyWithCheckSum size -2).

"CODE TO REMOVE THE '$' AND STORE INTO newMsg"

"compares the 'ZZ' to the checksum calculated from newMsg"
^(self calcCheckSum: newMsg) = (self getCheckSumFromReply: replyWithCheckSum)

TL; DR如何在visualt 2.5中删除smalltalk中字符串中的第一个字符(是的,我知道这很古老)

Answer 1

你可以试试

myString allButFirst

(顺便说一下,对任何收藏都有效)