Okay, I got it to limp through the code. Not beautiful, but I am not
getting mangled UniDynArrays anymore.
Here is what I do.
After I execute one line of UniDynArray gymnastics, I check if the object
has come back and is available before I execute the next line.
What was:
mitemClaim.SubValue(306, gintLineNumber, pintCount).StringValue =
pVarDTP_Array(1)
mitemClaim.SubValue(307, gintLineNumber, pintCount).StringValue =
pVarDTP_Array(2)
mitemClaim.SubValue(308, gintLineNumber, pintCount).StringValue =
pVarDTP_Array(3)
Becomes:
mitemClaim.SubValue(306, gintLineNumber,
pintCount).StringValue =
pVarDTP_Array(1)
Do While mitemClaim.StringValue = ""
System.Threading.Thread.Sleep(10)
Loop
mitemClaim.SubValue(307, gintLineNumber,
pintCount).StringValue = pVarDTP_Array(2)
Do While mitemClaim.StringValue = ""
System.Threading.Thread.Sleep(10)
Loop
mitemClaim.SubValue(308, gintLineNumber,
pintCount).StringValue = pVarDTP_Array(3)
Do While mitemClaim.StringValue = ""
System.Threading.Thread.Sleep(10)
Loop
Ugly but it gets me through a product demo until I come up with something
better.
I have to see if there is a VB.Net way of checking if an Interop Call has
finished its thread and returned and released the argument. I am just no
expert on this new .Net stuff
Another thing I discovered on my research is that there is a way to make
VS.Net single threaded by declaring at the beginning of a page:
System.Threading.Thread.CurrentThread.ApartmentState =
System.Threading.ApartmentState.STA
whereby STA stands for 'Single Threaded Apartment' as opposed to MTA
'Multi-threaded-Apartment'
This did not resolve my problem though.
Martin Scholl
President HIPAAsuite
18910 New Hampshire Ave
Brinklow, MD 20862
301-924-5537 Phone
301-570-0139 Fax
301-613-9572 Cell
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of BobJ
Sent: Monday, January 24, 2005 8:19 AM
To: [email protected]
Subject: Re: [U2] UniObjects and VB.Net
That's definitely available with any of the .net languages and probably
could be gerry rigged simply by setting a semaphore. It also might mean
that the thing runs slow enough to be useless. Probably the better
alternative would be to manipulate the dynamic array with whichever U2 you
are using. Or it might work to make a flat file and use ADO and a stream
but you might run into the same thread problems. Or make a number of
smaller arrays so that the threads are less likely to collide. The problem
with that is "less likely" may be too likely. Possibly the best answer is
to ask the question on one of the MSDN news groups. They won't know what
you mean about dynamic array so you may have to change the wording a bit. A
dynamic array to a .NET developer, as you probably already know anyway, is
one that can be re-dimensioned at run time.
Let us know when and if you find an answer, please.
BobJ
----- Original Message -----
From: "Martin Scholl" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Monday, January 24, 2005 7:22 AM
Subject: RE: [U2] UniObjects and VB.Net
> Bob,
> that is what what I observe. Here is what I believe is happening:
>
> VS.Not has a 'thunking' layer between its excution layer aka 'the
> CLR(Common
> Language Runtime)' aka 'virtual machine' aka 'Managed Code' and
> UniObjects,
> which is a dll that is compiled into machine code. For some reason this
> 'Interop Com Service' as Microsoft calls it, spawns off multiple threads
> that manipulate the UniDynArray. Those threads cross and mangle the
> array.
>
> I wonder if there is a way to make sure that one thread completes before
> the
> next one is started. A way to protect the UniArray from multiple access.
>
> Martin Scholl
> President HIPAAsuite
> 18910 New Hampshire Ave
> Brinklow, MD 20862
> 301-924-5537 Phone
> 301-570-0139 Fax
> 301-613-9572 Cell
>
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of BobJ
> Sent: Monday, January 24, 2005 5:47 AM
> To: [email protected]
> Subject: Re: [U2] UniObjects and VB.Net
>
>
> The words "thread safe" leap to mind. If there are multiple threads and
> no
> locks then mangling could be expected if a later launched thread assaults
> part of the array before the earlier launched thread writes it back. Just
> a
> thought.
> BobJ
> ----- Original Message -----
> From: "Martin Scholl" <[EMAIL PROTECTED]>
> To: <[email protected]>
> Sent: Sunday, January 23, 2005 9:31 PM
> Subject: [U2] UniObjects and VB.Net
>
>
>>I am using UniObjects ( the pre .Net version) in a VB.Net ASP.Net
>> application.
>>
>> I am populating a UniDynArray with a file parser. The Array is large,
>> more
>> then 300 attributes.
>> When I run this parser, my array is mangled. Attribute contents are
>> mixed
>> with each other, attribute counts don't match with what I wrote in the
>> code.
>>
>> When I run the code in the debugger, nice and slowly, I don't see a
>> problem,
>> only that sometimes it takes a second or to, for the UniDynArray to come
>> back from a call. But when I run full speed, the mangling happens.
>>
>> It looks like VB.NET starts several threads to deal with UniObjects, does
>> not wait until the thread is finished and then mangles the different
>> pieces.
>> Sometimes I get System.Runtime.InterOp.COMExceptions.
>>
>> Has anybody had similar problems? Found Work-arounds?
>>
>> I can't move over to Uodotnet yet. THere is too much code. I though of
>> parsing my file into a Uodotnet.UniDynArray but then I saw that I can't
>> even
>> initialize a .Net UniDynArray with a session object.
>> Martin Scholl
>> President HIPAAsuite
>> 18910 New Hampshire Ave
>> Brinklow, MD 20862
>> 301-924-5537 Phone
>> 301-570-0139 Fax
>> 301-613-9572 Cell
>> -------
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