Data Access Worldwide Knowledge Base
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PROBLEM:
I noticed that a TRIM function not only removes my leading and trailing spaces but also removes leading and trailing tab characters. Why is that?
ANSWER:
A tab character is considered white space and removed by the TRIM function like a space. Other characters that are white space are: 0x0A 0x0B 0x0C and ox0D.
In the following test routine the length of the string before trimming is 8 bytes and after trimming it is 2 bytes.
Procedure Test
String sData
Move ("AB" + Character ($09)) To sData // Tab
Move (sData + Character ($0A)) To sData // LF
Move (sData + Character ($0B)) To sData // VT
Move (sData + Character ($0C)) To sData // FF
Move (sData + Character ($0D)) To sData // CR
Move (sData + Character ($20)) To sData // Space
Showln (Length (sData))
Move (Trim (sData)) To sData
Showln (Length (sData))
End_Procedure
Which characters are considered white space can be changed via the dfconfig utility. The result of this utility is written to an INI file (usually DFINI.CFG) and loaded at startup of the program/runtime. The configuration information can be loaded too with the Read_Dfini command.
Contributed By:
Vincent Oorsprong
Company: Data Access Worldwide
email: vincent.oorsprong@dataaccess.eu
Web Site: http://www.dataaccess.eu
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