TechNote (Archived)

What can cause an Invalid User ID in a message sent from the Multiuser Server?

Issue

After issuing ConnectToNetServer(), the server responds with the following error:

-2147216221 (Invalid User ID)

The server console window displays a black rectangle next to the userID, and it indicates that the connection has been rejected.

Reason

The problem occurs if the RETURN character is included in the #userID string sent via ConnectToNetServer(). This occurs most frequently when users enter their userID into an editable field at runtime, and the RETURN key is pressed.

Solution

Parse and edit the string prior to issuing ConnectToNetServer(). The following code demonstrates one possible approach:

 on filter whichField   num = member(whichField).char.count   repeat with i = num down to 1     if member(whichField).char[i] = RETURN then       delete member(whichField).char[i]     end if   end repeat end

Alternatively, for field cast members, the "Limit to Field Size" property may be set to prevent unwanted RETURN entries.