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Security considerations and VBA
Security considerations and VBA
VBA
•Within Excel Options, go to the “Trust Center” and within 
 
p
,g
“Macro Settings,” choose “Disable All Macros with 
Notification.
I E
l2003
llfil
ith
ith t
ith
•In Excel 2003, we save all files –with or without macros –with 
s –with 
 
extension .xls
•In Excel 2007, if we have a macro, we can’t save with the 
,
,
default .xlsx extension; we must save it with extension .xlsm
•Finally, once you’ve got these right, you may have to save and 
i
dh
d
d
h “S
i
exit, reopen spreadsheet, and respond to the “Security 
urity 
 
Warning Macros Have Been Disabled” with “Enable This 
Content”
© 2010 S. Malpezzi
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Macros: motivation
n
•Howcanweautomateourwork?
How can we automate our work?
work?
•Examples:
We design a proforma for a representative 
ative 
 
investment.  What if we have a database with 500 
investments?
W–e want to write our own function that calculates 
IRR for a wide range of possible values
© 2010 S. Malpezzi
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Two ways to create macros in Excel
Excel
•(1)Usethemacrorecorder
(1) Use the macro recorder
rder
E–xcel records VBA code that reflects what you do 
until you turn the recorder off.
y
•(2) Write code directly in the VBA editor
•Usually,wedoabitofboth
Usually, we do a bit of both
 both
–The recorder often does the unexpected, or the 
redundant; run the recorder, then edit the results.
–When writing code, and you don’t know what to do, try 
the recorder to get some ideas.
© 2010 S. Malpezzi
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The VBA Editor
or
•BetweenExcel5.0andExcel97,theenvironmentfor
Between Excel 5.0 and Excel 97, the environment for 
t for 
 
writing VBA code changed a lot.
The 97/2000/2002 VBA editor is much more 
/
/
powerful than “module sheets” in 5.0.
It is also more complicated.
p
© 2010 S. Malpezzi
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Getting to Macros and the VBA Editor
Editor
•In2007: DEVELOPERtaboftheRibbon,CODE
In 2007:  DEVELOPER tab of the Ribbon, CODE 
 CODE 
 
Section.
•In 2003: TOOLS, MACRO
,
© 2010 S. Malpezzi
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erase text from pdf; extract text from pdf to excel
The Visual Basic editor works
‘alongside’ Excel, but it is not
Excel.  It is a separate application.
This window contains
a macro (a function, 
actually).  You can
type and edit, like a 
simple word processor.
This window ‘explores’ your MS
environment.  You can find your
open Excel files, your macros
ros
(in modules), and other stuff.
© 2010 S. Malpezzi
In the Project Explorer window, we see what’s  associated
with the project ‘R631 Probs 1 and 2.xls,’ i.e. with the
Excel spreadsheet of the same name.
These modules contain my macros and functions.  Click, and
they will appear in the larger area to the right.
These sheets are my Excel worksheets.  Click and we’ll go
to them, in Excel (another window). 
Here I have some add-ins open, that work with Excel, like
PDF writer, and S-Plus (a statistical and graphics package).
ATPVBAEN.XLA and FUNCRES.XLA are collection of
extra functions and analytic procedures that come
with Excel.  If they’re not open, go to OPTIONS menu in Excel
if you will need them.  (You will).
© 2010 S. Malpezzi
When you open VBA editor for the first time, 
there may or may not be a module sheet.
eet.
•Ifyouhaven’twrittenanycodeearlier(orrunthe
If you havent written any code earlier (or run the 
un the 
 
recorder) you probably won’t find a module sheet.
•Go to the PROJECT EXPLORER window of the VBA 
Editor, select your VBA Project (the name of the Excel 
workbook you are using), and then from top menu, 
INSERT a MODULE.  One should appear, like a blank 
sheet of white paper, in the large window to the 
right.
© 2010 S. Malpezzi
Our first macro written from scratch
Sub Sillymacro( )
Beep
End Sub
Required
Action to be
e
performed
© 2010 S. Malpezzi
Expressions
•Definition: something that returns a valuein VBA.
g
•For example,
3 + 2
zzz = 5
12
a VBA function,
‘builtin’
x = sqr(4)
x < 7
built in
x = x + 3
a logical expression
(returns ‘true’ or ‘false’)
© 2010 S. Malpezzi
Documents you may be interested
Documents you may be interested