Detect and remove UTF8-BOM Header

renehorstmann

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

renehorstmann

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

lemster68

Try IF str :=  "" THEN
        ! do nothing
      ENDIF

renehorstmann

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

lemster68

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.