Calling a C# (.NET) Method from PowerBuilder

Question

I am looking for direction in regards to calling a C# module (written in the .NET (2.1) framework) from PowerBuilder. Here is the C#.NET information: The function is used to connect to COM PORT device and get the device status.

NameSpace:  NETS
Class:    NETS
Method:    REQUESTCARDSTATUS()
DLL:    NETS.dll

Using my dll as OLE Object in Powerbuilder. I am using PowerBuilder version 11.5. I have a simple window with a command button on it. Within this window, my code looks like this:

OLEObject ole_3 ole_3 = CREATE OLEObject

// connect to C# class
MessageBox("Value = ", +String(li_rc)) IF li_rc <> 0 THEN DESTROY ole_3 END IF

 li_sum = ole_3.RequestCardStatus(); 

Getting error while calling this function Error R0035: Error Calling External Function.

The function is working fine when try to call the function using c# application. I don't know what is causing the issue in powerbuilder. Trying from past three day, but no luck.

Answer 1

Your code shows that you have not called the ConnectToNewObject function for starting the Ole server application. After creating ole_3 and before calling the RequestCardStatus function, you should call this function as follows:

ole_3.ConnectToNewObject ( classname )

where classname is a Progid or a Classid of the server

Answer 2

The C# dll must be made COM visible.

The syntax to connect (using your example) would be: ole_3.ConnectToNewObject('NETS.NETS')