문자열에 들은 문자의 갯수를 열람합니다.
Length := StrLen(String)
This function returns the length of the string.
If String is a variable to which ClipboardAll was previously assigned, StrLen() will retrieve its total size.
StringLen, InStr(), SubStr(), Trim(), StringLower, StringUpper, StrPut(), StrGet(), StrReplace(), StrSplit()