WDL Conversion Question about windevlib HOT 5 CLOSED

Edit: Passing Null does not work. Crashes app.

from windevlib.

Nothing is the proper thing to pass for an optional ByVal interface you're not using.

ret = UrlDownloadToFile(Nothing, Url, filePath, 0&, Nothing)

Null is misleading; it's a special Variant thing, doesn't work with anything else.

vbNullPtr is only for UDTs. If you find an argument that's now a UDT where before it was "As Any" and you were passing ByVal 0, you'd now pass vbNullPtr (No ByVal, but that's likely to change before tB 1.0 to more clearly indicate we mean to pass a null pointer.)

I've asked Wayne to give us a single consistent equivalent of C/C++ NULL, so hopefully less confusing in the future.

from windevlib.

That makes sense, now that you point it out. I don't know why I didn't think of it. Thanks Jon!

from windevlib.

It might be helpful to add a note for novices like me in your (very excellent BTW!) Readme that:
"You should pass Nothing to an optional argument ByVal [Interface] that you are not using".

from windevlib.

I'll add that and try to make the section clearer, thanks for the feedback. 👍

from windevlib.