Variables passed to/from functions
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Forum Name: Classic ASP Discussion
Forum Description: Discussion on Active Server Pages (Classic ASP).
URL: https://forums.webwiz.net/forum_posts.asp?TID=16449
Printed Date: 29 March 2026 at 11:56pm
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Topic: Variables passed to/from functions
Posted By: ub3rl337ch3ch
Subject: Variables passed to/from functions
Date Posted: 05 September 2005 at 9:30pm
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I'm having trouble getting variables to follow through from a function in which their value is altered. As previously suggested by people here I declared said variables first so they are classified as variables on a program-wide scope rather than just within the function. I have also attempted to call the function specifically with the var names eg: call functionname(var1,var2,var3,var4,var5,var6) the problem is that in a later part of the program i need to call var1 through 6 within another function, where they are written to the database. When they don't get passed from function1, they default to the null value from when they were dim'ed, and i get a whole bunch of blank values in the database. Is there anything that i'm forgetting to do to get the values to pass properly? or am i just going to have to hard-code the functions in the places they're required. For obvious reasons i'd like to avoid this at any cost.
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Replies:
Posted By: dpyers
Date Posted: 06 September 2005 at 8:07pm
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Good tut here - http://www.aspfaqs.com/aspfaqs/ShowFAQ.asp?FAQID=33 - http://www.aspfaqs.com/aspfaqs/ShowFAQ.asp?FAQID=33 ------------- 
Lead me not into temptation... I know the short cut, follow me. |
Posted By: ub3rl337ch3ch
Date Posted: 06 September 2005 at 8:19pm
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i discovered that the reason it wasn't working was that i was attempting to use the values from function1 in function2, like:
dim var1, var2
function function1()
var2 = "bill"
end function
function function2()
if var1 = "bob" then
...
end if
if var2 = "bill" then
...
end if
end function
var1 = "bob"
call function1()
call function2()
response.write var1
response.write var2
for some reason while var1 can be read by function1 and function2 and the r.w in the main code, var2 cannot be read by function2, only the main code. even specifying the parameters, and specifying byref doesn't have any impact.
i discovered that if i nested function2 within function1:
function function1()
var2 = "bill"
call function2()
end function
there is no propblem...
then again the reason i had so much trouble may be that i have about jack all theoretical knowledge of asp
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Posted By: Gullanian
Date Posted: 07 September 2005 at 12:40am
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Reading up on basic programming architecture will help you with
this. You can pass variables through into functions, which would
create a better system because variables would have a local rather than
global scope. |
Posted By: dpyers
Date Posted: 07 September 2005 at 5:02am
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Check out the differences between functions and subroutines as well. A
function is really just supposed to return a referenceable value and a
sub routine fills multiple variables. So if you had a function like... Function fncX (A, B) If A = B then fncA = true Else fncA = false End Function Then you check it inline by If fncX("sss", "sss") then ... or you do something like Dim A Dim B Function fncGetIt() fncGetIt = A + B End Function And in your code you'd do something like ~code to manipulate A and B ~ Response.Write fncGetIt Most asp commands are just functions - e.g date, instr, trim, etc. Functions allow you to write your own reuseable commands whereas subroutines are reuseable blocks of application code. It's admittedly a fine distinction but a rule of thumb is if you can wrap the logic and use it like a command, it should be a function. If not, then it should be a subroutine. -------------
Lead me not into temptation... I know the short cut, follow me. |