File registering bug 2: NewReader issue

From: Wijck, Bart van <"Wijck,>
Date: Mon, 26 Jan 2004 14:39:27 +0100

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Hi,

Continuing on from the previous problem, I get another error.

This time I am registering the file in the DbuClient.GetFile procedure.

Next I try to do the following (as before).

        IF f = NIL THEN
                Log.String("Test Failed"); Log.Ln;
        ELSE
                Log.String("Test Succeeded"); Log.Ln;
                r := f.NewReader(NIL);
                WHILE ~r.eof DO
                        r.ReadByte(b); ch := CHR(b);
                        (* further processing here *)
                END;
                f.Close;
        END;

This time it aborts with a TRAP 20 (Precondition violated) on the NewReader
statement. In the documentation there's no precondition with number 20 in
the Files.NewReader procedurer description. Elsewhere in the Files module
documentation it seems to indicate that the file is still anonomous (which
seems strange as it is registered).

I can circumvent it by formally reopening the file with:
        Loc := Files.dir.This(path); (* locator object *)
        f := Files.dir.Old(Loc,file,FALSE);

and then do the NewReader etc.

That seems somewhat superfluous as I already had a f pointer value. So why
can't I directly connect a NewReader to it?

Any answers?

Bart

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Received on Mon Jan 26 2004 - 14:39:27 UTC