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calling a dotnet com object created via COM class template from vb6 on user's machine

Posted on 2009-07-10
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Last Modified: 2012-05-07
I have created a com object using the COM class template but what do I need to do to deploy it to other computers.
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Question by:bmutch
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19 Comments
 

Author Comment

by:bmutch
ID: 24826447
I put the dotnet com dll in the app folder, ran regasm on it successfully, and it still won't call the dll from the vb6 app.
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Author Comment

by:bmutch
ID: 24826558
Well, I have it working, but in my calling app I had to use late-binding, is it possible to use early binding, ie.
dim dotnetclass as dotnetclass
... etc...
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LVL 96

Expert Comment

by:Bob Learned
ID: 24840358
If you have the ProgID for the COM component, then you can use the CreateObject or GetObject calls for late-binding to COM classes.

Examples can be found here:

CreateObject Function (Visual Basic)  
http://msdn.microsoft.com/en-us/library/7t9k08y5(VS.80).aspx


Dim adoApp As Object
adoApp = CreateObject("ADODB.Connection")
 
 
   Dim xlApp As Object
    ' Replace string "\\MyServer" with name of the remote computer.
    xlApp = CreateObject("Excel.Application", "\\MyServer")
    MsgBox(xlApp.Version)

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Author Comment

by:bmutch
ID: 24840860
well, I really don't want to develop "blind" like that, I need early binding as I mentioned above, and I found a vs2003 template to create a c# page that will make a class that enabled this. But now I still need to know how to deploy this to clent computers. I ran regasm manually and it worked, but what is the best way to do it via some sort of "setup" program?
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LVL 96

Expert Comment

by:Bob Learned
ID: 24840976
Geez, Monday morning blues (d'oh).

I read that comment incorrectly.  You want early-binding, and not late-binding.  Are you working with 1.1 or 2.0/3.5?
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Author Comment

by:bmutch
ID: 24843273
I'm using 3.5, and only thing left to do is "register" the dotnet com componenet on client machines.
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LVL 96

Expert Comment

by:Bob Learned
ID: 24844084
There is an option in the properties for an assembly:  Register = vsdraCOM
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Author Comment

by:bmutch
ID: 24853813
Is this in the assembly's project or in a Setup and Deployment project to deploy the assembly. Is there any other way other than creating a Setup and Deployment project? Can I just run regasm directly (like when the calling program starts up somehow to check to see if the assembly is registered and if it isn't then run regasm- I don't know how to check to see if it is registered, com dll's are easy to check) Also, how do I find the path to regasm?

thanks.
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LVL 96

Expert Comment

by:Bob Learned
ID: 24853858
What type of deployment are you talking about?  You could use a batch file to XCOPY deploy the assembly and run regasm.  Also, it doesn't matter if you run regasm, even if it is registered already, so you don't need to check.
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Author Comment

by:bmutch
ID: 24884811
Where is the location of regasm, would it depend on the framework version running on the computer:?
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LVL 96

Expert Comment

by:Bob Learned
ID: 24886850
Regasm is in the framework version-specific folder (i.e. C:\Windows\Microsoft.NET\Framework\v2.0.50727).
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Author Comment

by:bmutch
ID: 24892304
this seems pretty messy:
Can a computer have multiple frameworks installed, ie, if you upgrade frameworks on a computer can it still use the old framework versions? In VS if I set a specific version as the "target" what happens if that version is not installed on a computer?
thanks.
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LVL 96

Expert Comment

by:Bob Learned
ID: 24894742
You can have multiple frameworks installed, and each can work independently.  If you target a specific version of a .NET framework, then it must be present in order for the application to run correctly.  

You can require a particular version of the CLR runtime, with config settings:

App.config Examples
http://blogs.msdn.com/suzcook/archive/2004/05/14/132022.aspx
Forces the v1.0 CLR to be run. If the v1.0 CLR is not installed, the app will fail to run.
 
<?xml version ="1.0"?> 
 <configuration> 
    <startup> 
         <requiredRuntime version="v1.0.3705"/> 
         <supportedRuntime version="v1.0.3705"/> 
     </startup> 
 </configuration>

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Author Comment

by:bmutch
ID: 24897580
I would think that if I am targeting 3.5 framework I would find the correct regasm.exe to use in that folder, but a search of my dev. computer shows regasm only in the v1.0.3705, v1.1.4322 and v2.0.50727 folders. Given this how do I find the correct regasm to run on the clinet computer.
thanks?
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LVL 96

Accepted Solution

by:
Bob Learned earned 500 total points
ID: 24898121
3.5 and 3.0 both still use the 2.0 folder, since the REGASM didn't change from 3.0 and 3.5.
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Author Comment

by:bmutch
ID: 24898608
aha, thank you very much. I think I'm finally good to go.
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Author Closing Comment

by:bmutch
ID: 31602216
excellent, thanks.
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