Detect and remove UTF8-BOM Header

RAPID Programming
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1

Hey,
I am reading a text string from a .txt file in the HOME dir.
When I edit that file on the (real) robot controller in RobotStudio, it will be encoded in UTF8-BOM and the 3 byte header: “” is added at the beginning of the file.

What would be the best way to detect and remove the BOM header out of the string I read with:

VAR iodev io;
VAR string str;
Open file,io\Read;
str:=ReadStr(io \RemoveCR\DiscardHeaders);
Close io;

my fear is that I can´t just have the string “” in the source code. Other UTF8 non ASCII glyphs (like äöü) are occasionally destroyed and replaced with other glyphs while saving/loading.

Thanks in advance

2

Try IF str := “” THEN
! do nothing
ENDIF

3

so are these glyphs “” ok to have in source code? “äöü” do make problems in our comments

4

If you were to try to view an encrypted module, you would see many strange characters, and so I could guess that the controller might be confused as to whether the module is encrypted or not with those characters present.

5

Fixed it,
to not use non-ascii-glyphs in the source code, one can also use the hex representation of the BOM-Header like so:

VAR iodev io;
VAR string str;
Open file,io\Read;
str:=ReadStr(io \RemoveCR\DiscardHeaders);
Close io;
! remove UTF8-BOM 3 bytes header, if available
IF StrPart(str, 1, 3) = “\ef\bb\bf” THEN
str := StrPart(str, 4, StrLen(str)-3);
ENDIF