Createobject function conversion process form VB to c#.net

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I am in the process of converting a VB Project to C#. Now I am getting problem with a Createobject function,which I couldn't understand exactly what it is.

VB

Set DVXRT = VBA.CreateObject("DVXR48OLE.CDVXRT")
If (DVXRT.Login(nFirma, sCode$, sPWT$, gsDBServer, sPath)) Then.....

Here DVXR48OLE.CDVXRT is an application done by some person.When the If condition enters, a login form is loaded. Login form is from the application.

What I have tried:

I tried this in C#

C#

<pre lang="c#"> Object obj = Activator.CreateInstance(Type.GetTypeFromProgID("DVXR48OLE.CDVXRT"));
If (obj.Login(nFirma, sCode$, sPWT$, gsDBServer, sPath)

Error comes that there is no Login in obj. The problem is no details about the application. If anyone have ideas please share me. It ll be so helpful

Posted 27-Feb-19 1:32am

Priya Karthish

Updated 27-Feb-19 1:43am

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2 solutions

Solution 1

"DVXR48OLE.CDVXRT" is a COM object that has to be registered on the machine. To use it from .net you need to use a proxy system called interop. Basically add a reference to the relevant COM object via the Add Reference dialog and Visual Studio will create a .net class you can use in your code which in turn uses the underlying COM object. Depending on what this object does there is no guarantee it'll work from your c# code.

Google ".net interop" or "calling com objects from c#" for more details\examples.

Posted 27-Feb-19 1:37am

F-ES Sitecore

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Maciej Los · Accepted Answer · 2019-02-27T01:44:00

Solution 2

Follow the instruction from: How the new C# dynamic type can simplify access to a late bound COM object[^]

C#

Type custom = Type.GetTypeFromProgID("DVXR48OLE.CDVXRT");
//magic word: dynamic!
dynamic obj = Activator.CreateInstance(custom);
//late binding in action!
if (obj.Login(nFirma, sCode$, sPWT$, gsDBServer, sPath)
{
    //...
}

Posted 27-Feb-19 1:44am

Maciej Los

Updated 27-Feb-19 2:42am

v2

Comments

Priya Karthish 27-Feb-19 8:16am

Error : The name 'dynamic' does not exist in the current context. Do I need to add any reference for this?

Maciej Los 27-Feb-19 8:41am

Yes!

using System.Dynamic;

More at: Using type dynamic - C# Programming Guide | Microsoft Docs[^]

Priya Karthish 27-Feb-19 10:43am

Now Error is gone. But I don't know the Login form is not opening. I just checked my VB project. I gave the exact same as in VB. But from VB the login form opens, but from C# it's not opening. Couldn't able to guess why?

Maciej Los 27-Feb-19 11:07am

You should check if obj is not null first!

Priya Karthish 27-Feb-19 10:56am

Is there any possible to check what is in the Login function of the COM object(DVXR48OLE.CDVXRT)?

Maciej Los 27-Feb-19 11:10am

You may try to decompile that COM object. See this: Program Transformation Wiki / Visual Basic Decompilers[^]

Priya Karthish 1-Mar-19 5:30am

Thanks. Actually I need to Unlog before logging in. Now it worked out. Thanks for the help and also sorry for replying late.

Maciej Los 1-Mar-19 5:40am

You're very welcome.
Cheers
Maciej