Feedback on the same screen as stimulus

[David McFarlane]

See the "Mid", "Context.GetAttrib", and "Context.SetAttrib" topics in 
the E-Basic Help facility.

As for "brackets vs. quotes"...  Well, this gets indirectly to a pet 
peeve of mine.  You see, rational programming languages (such as C) 
use the same sytax for "subroutines" and "functions", and the best 
languages eliminate that distinction altogether (e.g., in C 
everything is a function -- "subroutines" are nothing more than 
functions that return void).  Alas, VBA (and thus E-Basic) makes a 
hard distinction between these two concepts.  This includes different 
syntax.  The arguments to VBA Functions *must* be enclosed in 
parentheses (), while the arguments to VBA Subroutines must *not* be 
enclosed in parentheses!  Sheesh!  And if you fail to do that, then 
you will get an error message that is entirely unrelated to the 
syntax error!  I cannot tell you how many hours I have lost in 
debugging errors due to this absurd difference in syntax.

Anyway, if you are unsure how to use E-Prime, then you should first 
follow my advice in these two essays:
http://groups.google.com/group/e-prime/browse_thread/thread/5425e03968cab428
http://groups.google.com/group/e-prime/browse_thread/thread/b0ce54870b723fc3

It would also not hurt if you took a course specific to E-Prime, 
e.g., http://psychology.msu.edu/Workshops_Courses/eprime.aspx .

In short, as in any serious enterprise, you need to first take time 
out to get proper training, and that means including training time in 
projected deadlines.

-- David McFarlane


At 5/22/2012 09:49 AM Tuesday, Beckerlab wrote:
>Hey David,
>
>I understand the code (I think), up until here:
>
>         If Mid(strHit, 1, 5) = "Check" Then
>
>                 Dim nCheck As Integer
>                 nCheck = CInt(Mid(strHit, 6, 1))
>
>                 Debug.Print nCheck
>
>                 If c.GetAttrib("Check" & nCheck & "Image") = 
> "checkempty.bmp" Then
>
>                         c.SetAttrib "Check" & nCheck & "Image", 
> "checkfull.bmp"
>
>I don't know what the numbers 5,1 and 6,1 refer to...or why GetAttrib
>and SetAttrib have a different syntax (brackets vs. quotes?)...or what
>they do.  I think it's if you click on one, the other image will show,
>but I am not sure of the logistics... I am also not sure how I would
>modify for my case. I need it so it's not a single image, but all of
>the images in the attribute that change if clicked. How do I reference
>attributes like this? Attributename.Triallist?
>
>My deadline is approaching and I am still quite unsure of how to use E-
>prime...I am also not new to programming, so I am very frustrated...
>
>Thanks for any help in advance.
>
>On May 21, 2:52 pm, David McFarlane <mcfar... at msu.edu> wrote:
> > nCheck is a variable.  If you look further up in the code then you
> > should be able to figure out what it does (that's all I would do).
> >
> > -- David McFarlane
> >
> > At 5/20/2012 06:11 PM Sunday, Beckerlab wrote:
> >
> > >Thanks for the reply David!
> >
> > >I have tried to combine the 2 segments, but it won't work for some
> > >reason... I am not sure why... I am having trouble trying to decipher
> > >what
> > >"If c.GetAttrib("Check" & nCheck & "Image") = "checkempty.bmp" Then
> >
> > >                         c.SetAttrib "Check" & nCheck & "Image",
> > > "checkfull.bmp" "
> >
> > >Means? What is nCheck?
> >
> > >I just wanted to have a statement where If the stringhit = 1, then if
> > >you clicked on it a check will appear, else a red X... not sure what
> > >I'm doing wrong
> >
> > >Thanks in advance!
> >
> > >On May 17, 2:10 pm, David McFarlane <mcfar... at msu.edu> wrote:
> > > > Oops, I see that you already found the PST examples, so you are ahead
> > > > of me, I should have looked first!   I think you are on the right
> > > track here.
> >
> > > > -- David McFarlane
> >
> > > > At 5/16/2012 02:41 PM Wednesday, you wrote:
> >
> > > > >After even more searching...I am thinking of modifying
> >
> > > > >http://www.pstnet.com/support/samples.asp?Mode=View&SampleID=38
> >
> > > > >(Load image after mouseclick), so that the image unclicked will be my
> > > > >4 options, and after clicking, it'll go to a red x
> >
> > > > >I'm thinking some script like this
> >
> > > > >If mouseclick is on a certain image and strHit=1,
> > > > >  display checkmark
> >
> > > > >If mouseclick is on another image and strHit = 0
> > > > >display X
> >
> > > > >and if they click the correct 1, it goes to the next slide?
> >
> > > > >Hopefully it works!

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