Solved

ColdFusion MX - Method not found in remote DCOM object

Posted on 2004-04-06
9
554 Views
Last Modified: 2013-12-20
Hi all,

I'm trying to implement a multi-tier system [web server, app server, ...] but can't seem to connect the web server to the app server. Coldfusion keeps saying "The selected method TestFunc was not found.  
There are no methods with the specified method name and argument types. Please check your function and try again." when I try to load the page.

I'm trying to call a function (from ColdFusion) in my activex EXE after creating the object remotely. Here is a snippet of the activex EXE:

--------  VB CODE  ---------

Public Function TestFunc() as String
    TestFunc = "hello world"
End Function

--------  END VB CODE  ---------

Here is a snippet of the CF code:

--------  ColdFusion CODE  ---------

<cfobject type="COM" name="stdata" action="create" class="TestProject.TestClass" context="remote" server="\\appserver">

<cfdump var="#stdata#">

<cfset myString = stdata.TestFunc()> <!--- This line fails --->

--------  END ColdFusion CODE  ---------

Now, if I create the object in the default context (local), it works fine. It's only when I try to create the object using DCOM on the "appserver" that this fails. Am I missing some DCOM settings somewhere?

PS. The "cfdump" shows all the methods that I would expect, even when creating the object remotely.

Thanks!
0
Comment
Question by:aeromatt
9 Comments
 
LVL 11

Expert Comment

by:hart
ID: 10772646
just a question, u said activex exe...

so wasn't dll registered on the server??
Though you are specifying a class, i just wanted to know ether its an activex component or a dll that has been registered..

Also go to the registry of the remote server and check the progid of the class u r using..

Regards
Hart
0
 

Author Comment

by:aeromatt
ID: 10775778
hart:

>> so wasn't dll registered on the server??

The EXE was registered on the server and the client  (testprogram.exe /regserver)

Also, I neglected to mention that I wrote a VB test app that creates the object and calls the function.

However, I seem to be past the first hurdle. I changed the project settings for the EXE to use Binary Compatibility (vs. NO compatibility) and now my function is getting called.

Now the problem is just an error in my function: I'm trying to open a recordset, fill up an array with the data from the resulting table, and return the array as a function return. (TestFunc() as Variant) The error number is "3709" and the description is "The connection cannot be used to perform this operation. It is either closed or invalid in this context." Still researching this, will return when I have more data.
0
 

Author Comment

by:aeromatt
ID: 10814141
All,

My problem turned out to be a combination of ambitious coding and an incorrect oracle setting. First, I was using the ADODB.Connection as a return value from a function which had an error handler as such:

--------------- Begin VB Code ---------------------
Private Sub GetConnection() as ADODB.Connection
On Error GoTo Error_Handler:
...
Error_Handler:
...
End Sub

Public Function TestFunc(...) as ADODB.Recordset
...
myRecordset.Open GetConnection, ...
...
Set TestFunc = myRecordset
End Function
---------------  End VB Code   ----------------------

Well, the GetConnection function was causing an error, and the ADODB.Connection was coming back closed. The problem was that when using DCOM on another machine, I had to change the security attributes in my sqlnet.ora file, because sometimes the connection would not open correctly. Also, this was only happening in Release mode, and not Debug. In a nutshell, almost everything is working great now. The exception is the recordset:

I'm trying to pass a disconnected recordset to coldfusion and use it as a query. When I do a CFDUMP on the return value from the TestFunc, it shows all the functionality and structure of a recordset, but for some reason, ColdFusion will not treat it as a recordset. Can anyone provide a clue?
0
 
LVL 18

Expert Comment

by:Plucka
ID: 10856738
aeromatt,

Because it's record set not a query.

It's probably just a structure. Not sure if you can convert a structure to a query.

I'll ask the obvious question though, WHY?

Regards
Plucka
0
Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

 

Author Comment

by:aeromatt
ID: 10858987
Plucka,

To satisfy your curiosity, the reason I wanted to use it as a query was that we have a lot of existing coldfusion code that loops on queries, and now that everything is getting migrated to DCOM I'm going to have to switch all the query loops to array loops.

Derrick
aeromatt, LLC
0
 
LVL 18

Expert Comment

by:Plucka
ID: 10864475
Just my 2c worth but DCOM is old technology, I personally think that migrating to it now is a mistake.
0
 

Author Comment

by:aeromatt
ID: 10872654
You may be right. Perhaps someday we will be migrating to .NET. For now though, we are stuck/sticking with DCOM. But, I digress. I think this question thread is no longer useful to anyone, but thank you all for your participation. Admin: Please close.
0
 
LVL 1

Accepted Solution

by:
Computer101 earned 0 total points
ID: 11190670
PAQed, with points refunded (250)

Computer101
E-E Admin
0

Featured Post

Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Coldfusion Datefield problem 2 96
Strange space issue in Chrome browser 8 97
JVM encoding. How to change encoding. 27 86
cookies analysis tools 2 72
Turn A Profile Picture Into A Cartoon Using Photoshop And Illustrator This tutorial will teach you how to make a cartoon style image out of a regular picture. I have tried to keep the tutorial as simple as possible. I used Adobe CS4 for this tuto…
Objective of This Article In 1990’s, when I was a budding software professional, I had a lot of confusion about which stream or technology, I had to choose to build my career. In those days, I had lot of confusion like whether to choose System so…
The purpose of this video is to demonstrate how to automatically show related posts at the bottom of a blog post in WordPress. This will be demonstrated using a Windows 8 PC. Plugin “Yet Another Related Posts Plugin” will be used. Go to your…
The purpose of this video is to demonstrate how to exclude a particular blog category from the main blog page. This is can be used when a category already has its own tab, or you simply want certain types of posts not to show up on the main blog. …

896 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now