Coldfusion & COM DLL execution concurrency

Hi all,
I've been researching this problem on Google for a few weeks
and have come up blank.
We are running on ColdFusion MX6.1 & call some VB6 DLL's.
These DLL's interface with a 3rd party system & can take a
while (between 3 and 10 seconds) to execute their methods. The
DLL's themselves do not consume much in the way of resources.
It would appear that these DLL call's are being serialized
between users. IE, if 2 users invoke the DLL's at the same time, CF
will wait until user 1's call is finished before invoking the same
DLL method for user 2.
These DLL's are STA threaded, and I would have though that
ColdFusion (J-Integra) would start the second DLL in a separate
apartment (because user 2's request is coming in on a separate Java
thread) , therefore allowing both users DLL methods to be invoked
in parallel.
Does anyone know if ColdFusion is capable of executing
methods on the same DLL concurrently, or is there some sort of
limitation that causes these methods to be executed in serial?
Can someone please point me in the right direction.
Thanks,
Dave

HI... I have one similiar problem i run one code with jniwrapper in a simple java application from eclipse, but when i pass my code to a WebDynpro i get the next message
com.jniwrapper.win32.com.ComException: COM object method returns error code: 0x80070005; E_ACCESSDENIED (Acceso denegado.)
what can i do, in the EP the method call return me ACCESS DENIED ?

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C:\vb>CALL "C:\Program Files\Microsoft Visual Studio\VC98\bin\vcvars32.bat"
Setting environment for using Microsoft Visual C++ tools.
Microsoft (R) Program Maintenance Utility   Version 6.00.8168.0
Copyright (C) Microsoft Corp 1988-1998. All rights reserved.
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Flights.idl
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objidl.idl
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wtypes.idl
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Processing C:\PROGRA1\MICROS4\VC98\INCLUDE\oleidl.idl
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servprov.idl
Processing C:\PROGRA1\MICROS4\VC98\INCLUDE\urlmon.idl
urlmon.idl
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Processing C:\Program Files\SAPpc\SAPGUI\rfcsdk\include\sapconn.idl
sapconn.idl
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Regards,
Kelvin
[email protected]

Hi,
For those who might encounter a similar problem, I manage to solve the problem by installing the DCOM Connector from the same SAP GUI CD (ver 6.2).   I had the impression to download the DCOM Connector from sap.com but they have the 4.6D version which causes a problem if you are using a higher version of SAP Gui. The rule of thumb is to install the RFC SDK and DCOM Connector from the the same SAP GUI CD.
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Cheers,
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I'm using .NET Reflection to read a COM dll. I'm able to fetch the classes that are present in the dll. But I would like to know interface name which this class is implementing.
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Thanks, Satish Bommideni "Success usually comes to those who are too busy to be looking for it."

Hi,
Thanks for the reply.
I'm reading the COM assembly using the methods available in oleaut32.dll.
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Hello
I have a COM .dll which looks like that when opened with dll export viewer:
I would like to use the Get4AxisPos function in LabWindows.
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Go to Solution.

Hi ,
I am new to C++ and COM .
i need to implement a client application in C(lab windows CVI) , server is a c++ COM object.
steps followed by me
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CR XI R1: viewer can't open report with UFL from COM dll

Hello all!
I faced the following problem: report which is uses functions from COM dll doesn't works on customer's pc. CRViewer throws exception when calling ViewReport() method. GetLastError() gives just 0 ...
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Thx,
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Sorry, but you have to define "viewer just crashed". To different people this means different things; error, viewer never shows up, application terminates, etc., etc., etc....
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possibly - see below
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probably not - as long as it's the same OS and SPs
- something missing in our code (but why it works in 90% cases?)
-no
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possibly see below.
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Your second utility is [Process Monitor|http://technet.microsoft.com/en-ca/sysinternals/bb896645.aspx] but ProcMon creates large and difficult to read files.
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- Ludek

COM dlls in the Standard and Professional Editions of Crystal Reports

Post Author: enz0
CA Forum: Deployment
Hi.
Do the Standard and Professional editions of Crystal reports install all the com dlls?
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Hi,
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Dll hell version prbblem for a COM dll developed in VC++

Hello
We have developed a COM dll in VC++ ATL. We have developed a client application in labview using Ver1.0 of our dll. And now we have changed our dll to Ver2.0 .So now when we register ver2.0 dll, the first client application which is using ver1.0 is not working. Is this because of the dll hell versioning problem. Is there any other way we can do in labview so that we can avoid this dll hell versioning problem. Please let me know.
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I supposed your dll is a COM server registered it into the Windows registry.
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I have tried to call simple LabVIEW 8.6 Dll from win32 test application, class Library.
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Error 2 error C2733: second C linkage of overloaded function 'StrCpyW' not allowed d:\program files\national instruments\labview 8.6\cintools\extcode.h 464
Error 3 error C2733: second C linkage of overloaded function 'StrCpyNW' not allowed d:\program files\national instruments\labview 8.6\cintools\extcode.h 465
Error 4 error C2733: second C linkage of overloaded function 'StrCmpW' not allowed d:\program files\national instruments\labview 8.6\cintools\extcode.h 466
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DLL execution time

Hello,
Does anyone know how to reduce the time of calling the DLL file in the LabVIEW RT ? When I call the DLL file in a timed loops, the iteration duration shows that it needs half of a millisecond ( around 0.5 ms) to load the DLL file (inside the DLL file it do nothing just adding x to y and return the sum). Therefore I want to ask does the LabVIEW RT need to reload the DLL file every time in the timed loop? And how could I reduce the time of calling DLL file?
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Thank you Danny, your reply is very helpful for us to understand the mechnism of how LabVEIW RT is running.
Texas_Diaz wrote:
Is it necessary to call into the DLL in the Timed Loop? The timed loop is a...
It is very time-saving for us to use DLL file to in our project, because we are using a third party PCI card (Beckhoff FC1100 PCI EtherCAT slave card) and it's very convenient for us to manipulate the PCI card by using the C language. Therefore we want to turn this C-language-based program into a DLL and call it in the LabVIEW RT.
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But I still have some questions:
Do you think the performance of the target machine has a profound impact on DLL execution time? Because I use 32bit desktop PC with core 2 duo CPU as the target machine.
Another question is that:
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See
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Coldfusion & COM DLL execution concurrency

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