Hi,
To answer some of you questions:
SO an independent stack library can be called by the main stack,
but the
code must be independent and does not have access to any of the
functions or
commands in the stack that started it.
Yes, it's much better practice to have libraries totally independent
of the calling stack. They way they can be just dropped into any
project and even used by other Library Stacks.
However it is possible to have the Library call functions in the main
stack - see below. If you have "common" functions you want to call
from all StandardReports1.rev, StandardReports2.rev,
StandardReports3.rev it would be better to just create another
"Common" library file that contains all your common functions. Then
do a start using on this stack in the "libraryStack" handler of
StandardReports1, 2, 3 etc.
Can variables be passed between the
functions and data returned by the function?
Yes, here is a function that accepts data and returns data in two ways:
function ATestFunction theInputData,@theOutputData
put theInputData & "-HELLO-" into theOutputData
return 76
end ATestFunction
To call it:
put ATestFunction("GoodBye",myData) into myResult
After this has been called, myData = "GoodBye-HELLO-" and myResult = 76
How do I get the independent stack to start using the Main stack?
The main
stack is already in memory.
If you *really* want to do it this way, then all you do is put:
start using me
In the preOpenStack handler of the main stack.
Hope this helps
All the Best
Dave
On 10 Jul 2008, at 05:46, dcpbarrington wrote:
I have created the StandardRepor.rev as an independent stack and
the Main
stack starts the independent stack by doing the following:
if "StandardReports" is not among the lines of the StacksInUse then
start using stack "StandardReports"
end if
What I want to be able to do is be able to supply different sets of
reports
like a set of libraries. The main program selects either
StandardReports OR
CustomReports1 OR CustomReports2 and the main stack starts a specific
library based on the configuration. Each of the Stacks would have
the same
report functions, but depending on what stack is started, the user
can get
different report formats for the same set of information.
SO an independent stack library can be called by the main stack,
but the
code must be independent and does not have access to any of the
functions or
commands in the stack that started it. Can variables be passed
between the
functions and data returned by the function?
How do I get the independent stack to start using the Main stack?
The main
stack is already in memory.
Sarah Reichelt-2 wrote:
Is the StandardReport stack a sub-stack of the Main Stack or is it a
separate file?
If it is a sub-stack, then it automatically gets access to all the
handlers in the Main Stack, but if it is a separate file, they are
independent. You would then have to "start using" the Main Stack as
well, if you wanted StandardReport to be able to use it's handlers.
The "StandardReport.rev" file can be placed anywhere you like, but if
you want MainStack to be able to refer to it automatically, then se
the Main Stacks stackFiles property to include a reference to
"StandardReport.rev".
HTH,
Sarah
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