%TRIM Function
%TRIM built-in function returns the given string less any leading and trailing blanks.
%TRIM (String)
Parameters
String
Required. Can be character, graphic, or UCS-2 data. When specified as a parameter for a definition specification keyword, the string parameter must be a constant.
Example
BEGSR Trim_Ex
DclConst Name(String) Value(" This is a test string. ")
ioField1.Text = %Trim (String)
ENDSR