Question

I have a VB method

Public Sub append_text(ByVal s As String)
    f1.TextBox1.AppendText(s)
End Sub

which is called over COM from C++

_bstr_t b(L"test\nnew\nlines\n");
ATLENSURE_SUCCEEDED(t->append_text(b));

But the text box ends up saying

testnewlines

Without the aforementioned new lines.

Why is that then?

Answer 1

_{For the sake of completeness, posting my comment as an answer (now that I know it’s correct…):}

Different operating systems consider different character combinations as new lines. The *nixes, for instance, use a single \n, as in your code. Windows, on the other hand, uses the \r\n combination. Therefore, the single \n in your string just isn’t enough to be considered a new line marker. Using \r\n will do the trick.