Can a dll remember state information?

Hello
I want to write a dll to read an
excel file and return a 2D array of strings representing the
contents. I do not know at the start how big this array is going to
be. What is the best way of handling this. I thought of making two
calls, one to find the size and the second to get the array. Or can I
do the memory allocation in the DLL? (It's my first foray into DLL's)
The reason I'm writing a DLL is that
some customers have Excel97 and others Excel2000. It's time we fixed
this for once and all!
John

Hi John,
The answer to your question is yes, there are several ways to handle state information in a DLL.
However, this application is probably not suited for a DLL. I suspect
you would be better served in making ActiveX calls into Excel. There is
at least one example that ships with LabVIEW that shows how to do this.
Finally,
Finally, if you insist on writing a DLL, the best way to maintain the
state information is to create some sort of structure or class and
return a pointer to that class to LabVIEW. The call library node should
be instructed to treat the pointer as a U32. LabVIEW can't access the
data in the pointer, but it can pass the pointer on to the next DLL
call, which can then dereference it and access the data.
Jason

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If there's an FAQ somewhere which answers these (or similar) question,
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Q1. When I have a service object with Environment visibility and a
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Q2. I was trying to create a Crystal Report interface (CR V 5.0) to
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[email protected]

Priya Rath asks...
Q1. When I have a service object with Environment visibility and
a Transaction/Session Dialog Duration, how's state information
maintained? Is it automatic, or do I have to turn on the IsSharedattribute on the service object class ?First of all, the IsShared attribute deals with ensuring multiple tasks
are not accessing/updating the same object concurrently. And while
setting this attribute helps to ensure that "state information" is not
corrupted by multiple tasks, it has nothing to do with "maintaining"
state information.
So, the simple answer to your question is yes... assuming the state
information you mention is stored in SO attributes, then it will be
maintained automatically. However, as is the case with most simple
answers, there are numerous problems/issues that need to be considered.
1) For message duration SOs, the state information would generally only
last for a single method invocation, which normally means that all state
information is passed as parameters to the method and not maintained in
the SO.
2) For transaction duration SOs, the state information lasts for the
duration of the transaction. Therefore, any initiating state information
needs to be passed as method parameters. Subsequently, any changes to
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shared by all distributed tasks executing in the environment. As stated
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Steve McIntyre
MCI Systemhouse
[email protected]
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