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Resolved Tutorial: call a VisualStudio.C# DLL

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  1. Gimmy Susan
    Gimmy Susan
  2. PowerBuilder
  3. Friday, 30 March 2018 18:44 PM UTC 
Hello to all
I have a question from Noob.
I'm studying how to create a DLL in Visual Studio C # and invoke it in Powerbuilder.
Unfortunately I have an error:
Bad runtime function reference ....
What am I doing wrong?
Thanks for the reply.

I copy under the code

Gimmy

 

 

 

VS.C#

====

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AMGenerale
{
    public class AMUtility
    {
        public int AMSomma(int _n1, int _n2)
        {
            int totale = _n1 + _n2;
            return totale;
        }
    }
}

 

 

Powerbuilder 2017R2

==================

- Global External Function: FUNCTION integer AMSomma(int a1, int a2) library 'AMgenerale.dll'

- Code: commanButton.Event

int  a1, a2, a3
string s3
a1 = 1
a2 = 2
a3=AMSomma(a1, a2)
s3 = string(a3)
messagebox('', s3)

 

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Accepted Answer
Michael Kramer
Michael Kramer Accepted Answer Pending Moderation
  1. Friday, 30 March 2018 20:05 PM UTC
  2. PowerBuilder
  3. # Permalink

Hi,

Two issues

  1. C# - so you are generating a .NET assembly.
    ​Unfortunately external function in PowerBuilder requires WINAPI (_stdcall) format which is a "standard Windows" DLL format.
    ​See PowerBuilder Help > PowerScript Reference > PowerScript Topics > Declarations > Declaring external functions > Defining source for external functions.
  2. Datatype "int" - PowerBuilder defines "int" as 16-bit integer but C# defines "int" as 32.bit integer.
PowerBuilder Integers C# / C++ Integers

byte

 byte
int short
uint ushort
long int
ulong uint
longlong long

 

You can use OLEObject in PowerBuilder to interface towards C# class in a .NET assembly using "COM Callable Wrapper" as the interop technology.

 

HTH /Michael

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Responses (3)
Gimmy Susan
Gimmy Susan Accepted Answer Pending Moderation
  1. Saturday, 31 March 2018 15:08 PM UTC
  2. PowerBuilder
  3. # 1

Hi michael.

now i have understand

 

"You can't call methods of a C# type directly like you can with "normal" (native) DLL exported functions"

Native C++ code might be an option to explore, along with C# .NET.     As I recall, to work with native C++ in Visual Studio, one selects "Other Languages/Visual C++/Win32" template ... is that correct ?   I will very llikely try both methods.

 

 

Is it Right ?

Comment
Roland Smith
  1. Roland Smith
  2. Sunday, 1 April 2018 06:20 AM UTC
That is correct.



Define the functions like this:



int WINAPI AMSomma (int a1, int a2) {



}



The function also has to be exported. There are two ways to do that. One is to add a .def file to the project and the other is to add 

__declspec(dllexport) to the function definition.



The easiest way to do that would be to add this:





#define DllExport __declspec( dllexport )



Then define your function like this:



DLLExport int WINAPI AMSomma (int a1, int a2) {



}

  1. Helpful
Michael Kramer
  1. Michael Kramer
  2. Sunday, 1 April 2018 20:24 PM UTC
Hi Roland,



Thanks for helping me help Gimmy. Easter with family is keeping my busy.



/Michael

  1. Helpful
Rodolfo Reyes
  1. Rodolfo Reyes
  2. Monday, 2 April 2018 19:35 PM UTC
You can use this tutorial:  http://blogs.artinsoft.net/Mrojas/archive/2009/03/03/Calling-NET-from-PowerBuilder.aspx



 



 

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Gimmy Susan
Gimmy Susan Accepted Answer Pending Moderation
  1. Saturday, 31 March 2018 14:57 PM UTC
  2. PowerBuilder
  3. # 2

Hi Michael

Thx for replay.

I check the manual: https://www.appeon.com/support/documents/appeon_online_help/pb2017r2/powerscript_reference/ch03s04.html#d0e3758, but i have not understand where is the problem.

I create a VS program for consuming the DLL and it works fine.

I do not understand why PB do not work.

Gimmy

 

P.s.

i correct the data type

 

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