New topic: Checking for a Nil argument -- Not working for me
<http://forums.realsoftware.com/viewtopic.php?t=38413> Page 1 of 1 [ 3 posts ] Previous topic | Next topic Author Message basil.bourque Post subject: Checking for a Nil argument -- Not working for mePosted: Wed Mar 30, 2011 6:09 pm Joined: Thu Apr 15, 2010 10:41 pm Posts: 209 Location: Seattle I'm getting a compiler error when checking for a nil argument. Why does this code fail in a brand new project in a new class? Code:Sub bogusMethod(x as String) if x = Nil then MsgBox "Is Nil." end if End Sub Compiler reports: Quote:Type mismatch error. Expected String, but got Nil Shouldn't I be checking for a nil argument being passed? The docs explicitly say that a nil can be passed in place of a String. _________________ --Basil Bourque Using REAL Studio 2010 r5.1 with Postgres 9.0.3 on Mac OS X 10.6.5 http://crafted-software.blogspot.com/ Top Specialised Post subject: Re: Checking for a Nil argument -- Not working for mePosted: Wed Mar 30, 2011 6:30 pm Joined: Thu Aug 26, 2010 6:57 am Posts: 181 Location: Sydney Australia Code:if x="" then _________________ Regards Chris Musty Specialised Technologies Pty Ltd Software | Electronics | IT | Multimedia http://www.specialised.net.au ----------------------------------------------- RB 2011r1 Enterprise on Win7 Ultimate, Ubuntu 10.10 on Virtualbox Top mjh Post subject: Re: Checking for a Nil argument -- Not working for mePosted: Wed Mar 30, 2011 7:55 pm Joined: Sun Feb 19, 2006 3:10 pm Posts: 1175 Location: Hamburg, Germany If I remember correctly, it used to be the case that the empty string was actually implemented as nil (though that was never documented) and that you could test a string for being nil (equivalent to testing it for being the empty string). This appears to have changed. While the Language Reference claims that âYou can pass Nil for any of the string parameter typesâ, it appears you cannot (anymore â this used to be possible). Btw, see http://www.declaresub.com/article/153/strings-can-be-nil-even-if-they-cant-be-set-to-nil. At the time (around 2008) you could write code such as Code:dim s as String MsgBox Str(s is nil) but now the compiler complains about âisâ being used with a non-object (and if you replace âisâ by â=â it complains about nil not being a string). _________________ Michael J. HuÃmann http://digicam-experts.de Top Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending Page 1 of 1 [ 3 posts ]
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