Attempting to call Coolprop from VB.net (Visual Studio 2017)
Spiz103
I've been trying to use Coolprop to do some thermodynamic calculations but I can't, no matter what, get a project to work that allows me to call it from inside VB.net using VS 2017.
I've found some files that purported to be working examples for earlier versions of Visual Studio but they unfortunately throw horrible exception errors in 2017.
Does anyone have any idea how to get it working? I've tried all the instructions on the sourceforge website but am getting basically nowhere?
Jorrit Wronski
Hi,
have you had a look at the Excel wrapper? I am not an expert in VB, but isn’t VB.net closely related to the code used to call a DLL from Excel? Download the Windows installer and look at the Excel plugin to get an idea of what I am talking about: http://www.coolprop.org/coolprop/wrappers/Excel/index.html#automated-installation
Jorrit
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Ian Bell
Hi,
have you had a look at the Excel wrapper? I am not an expert in VB, but isn’t VB.net closely related to the code used to call a DLL from Excel? Download the Windows installer and look at the Excel plugin to get an idea of what I am talking about: http://www.coolprop.org/coolprop/wrappers/Excel/index.html#automated-installation
Jorrit
From: coolprop-users@googlegroups.com [mailto:coolprop-users@googlegroups.com] On Behalf Of Spiz103
Sent: Monday, December 18, 2017 6:11 PM
To: coolprop-users
Subject: [coolprop-users] Attempting to call Coolprop from VB.net (Visual Studio 2017)
Well,
I've been trying to use Coolprop to do some thermodynamic calculations but I can't, no matter what, get a project to work that allows me to call it from inside VB.net using VS 2017.
I've found some files that purported to be working examples for earlier versions of Visual Studio but they unfortunately throw horrible exception errors in 2017.
Does anyone have any idea how to get it working? I've tried all the instructions on the sourceforge website but am getting basically nowhere?
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Spiz103
I have attempted to use multiple wrappers without success - either I get errors detailing failure to load the DLL, or I get a "cannot find entry" type error.
I have also attempted to use multiple versions of the library using the LibreOffice Wrapper provided on Sourceforge - using the 32 bit stdcall DLL as directed.
This is a Windows 7 machine, however my Windows 10 netbook runs the 6.0.0 LibreOffice Wrapper/DLL combination perfectly.
So I have no idea what is going on really.
For example the LibreOffice Wrapper throws errors "BASIC Runtime Error, Error loading DLL file" repeatedly for each exposed function.
On Tuesday, 19 December 2017 02:31:14 UTC, Ian Bell wrote:
I would say the things to do would be:1) Rewind to the version of visual basic that we claim works. Make sure it works for you. If not figure out why not.2) Take the working project from old VS and import into VS 2017. Make sure that works.3) Start over with VS 2017.At each step, error logs are indispensable. This statement is useless from a debugging standpoint: "throw horrible exception errors" :)Kind Regards,Ian
On Mon, Dec 18, 2017 at 3:24 PM, Jorrit Wronski <jo...@ipu.dk> wrote:
Hi,
have you had a look at the Excel wrapper? I am not an expert in VB, but isn’t VB.net closely related to the code used to call a DLL from Excel? Download the Windows installer and look at the Excel plugin to get an idea of what I am talking about: http://www.coolprop.org/coolprop/wrappers/Excel/index.html#automated-installation
Jorrit
From: coolpro...@googlegroups.com [mailto:coolpro...@googlegroups.com] On Behalf Of Spiz103
Sent: Monday, December 18, 2017 6:11 PM
To: coolprop-users
Subject: [coolprop-users] Attempting to call Coolprop from VB.net (Visual Studio 2017)
Well,
I've been trying to use Coolprop to do some thermodynamic calculations but I can't, no matter what, get a project to work that allows me to call it from inside VB.net using VS 2017.
I've found some files that purported to be working examples for earlier versions of Visual Studio but they unfortunately throw horrible exception errors in 2017.
Does anyone have any idea how to get it working? I've tried all the instructions on the sourceforge website but am getting basically nowhere?
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Spiz103
Unfortunately rolling back to VS2012 is no longer an option as that software is no longer provided by Microsoft except to people with an MSDN subscription,
I have managed to get it to load the x64 DLL, however it now throws the exception error "System.EntryPointNotFoundException: 'Unable to find an entry point named '_Props@32' in DLL 'CoolProp.dll'.'" when it attempts to actually call a command in it.
I am pretty sure I am in the correct architecture as otherwise I get an error "System.BadImageFormatException: 'An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)'" - which I understand is associated with calling a 64 bit DLL with a 32 bit call?
Spiz103
Please find attached my code - I started with the original Coolprop VB.net example wrapper and it has mutated into this since it doesn't seem to work on VS2017 at all, not even recognising the C# component properly.
I have managed to work out the entry point problem using the manifest txt file on Sourceforge, however have run into a brick wall that the execution of this code generates a System.AccessViolationException: 'Attempted to read or write protected memory. This is often an indication that other memory is corrupt.' Error at the point at which the actual call to the DLL is made, the input does not appear to be malformed in any way and it is not throwing a segmentation fault.
So at this point I am entirely stumped.
Ian Bell
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Spiz103
On Tuesday, 19 December 2017 15:23:03 UTC, Ian Bell wrote:
Hmm maybe I need to look into this. Can you please file an issue on this topic on GitHub?
On Dec 19, 2017 7:34 AM, "Spiz103" <edmund....@student.manchester.ac.uk> wrote:
Sorry for yet another message by me,--
Please find attached my code - I started with the original Coolprop VB.net example wrapper and it has mutated into this since it doesn't seem to work on VS2017 at all, not even recognising the C# component properly.
I have managed to work out the entry point problem using the manifest txt file on Sourceforge, however have run into a brick wall that the execution of this code generates a System.AccessViolationException: 'Attempted to read or write protected memory. This is often an indication that other memory is corrupt.' Error at the point at which the actual call to the DLL is made, the input does not appear to be malformed in any way and it is not throwing a segmentation fault.
So at this point I am entirely stumped.
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Alessandro Mandelli
How did you get through the "Unable to find an entry point" dreaded error.
Despite using precompiled dll, or recompiling the solution from scratch, nothing works.
I can't get through the missing entry point.
Ian Bell
2) What have you tried so far? It's hard to tell from your question. What does "nothing works" mean? Logs/screenshots please
3) Can you please show your build log of your recompiled solution from scratch?
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Alessandro Mandelli
2) I've tried everything, from using the wrappers (most of them, including excel and c#) to recompile from scratch, with both cmake and vs2017. Compiling always ends succesfully. Specifically compiling with cmake and -DCOOLPROP_SHARED_LIBRARY although with 38 warnings pertaining mostly to TR1 machine namespace, yet again the resulting DLL can't be referenced from VS2017, and can't even be registered via regsvr32 for the same reason: can't find the entry point (my 0.02: namespace and main are missing, probably a swig issue)
3) Of course. What folder the logs are saved into? Is that ./build/x64/Release/ALL_BUILD by any chance?
The question remains: how did the OP get through the entry point problem with the manifest?
Cheers.
Il giorno venerdì 16 marzo 2018 04:02:23 UTC+1, Ian Bell ha scritto:
1) Do you want VB.NET or VB?
2) What have you tried so far? It's hard to tell from your question. What does "nothing works" mean? Logs/screenshots please
3) Can you please show your build log of your recompiled solution from scratch?
On Thu, Mar 15, 2018 at 8:49 AM, Alessandro Mandelli <alessandr...@coster.eu> wrote:
Hello, I'm trying to use Coolprop in a vb.net vs2017 solution.
How did you get through the "Unable to find an entry point" dreaded error.
Despite using precompiled dll, or recompiling the solution from scratch, nothing works.
I can't get through the missing entry point.
Il giorno martedì 19 dicembre 2017 14:20:05 UTC+1, Spiz103 ha scritto:Further to my last message:
Unfortunately rolling back to VS2012 is no longer an option as that software is no longer provided by Microsoft except to people with an MSDN subscription,
I have managed to get it to load the x64 DLL, however it now throws the exception error "System.EntryPointNotFoundException: 'Unable to find an entry point named '_Props@32' in DLL 'CoolProp.dll'.'" when it attempts to actually call a command in it.
I am pretty sure I am in the correct architecture as otherwise I get an error "System.BadImageFormatException: 'An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)'" - which I understand is associated with calling a 64 bit DLL with a 32 bit call?
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Alessandro Mandelli
I referenced DWSIM.Thermodynamics.Coolpropinterface.dll in my solution.
The code looks like this (for PropsSI only. Extend declarations to include more function). Works for AnyCPU, x86 and x64.
Imports CoolProp
Public Class Form1
Declare Function PropsSI_private Lib "Coolprop.dll" Alias "PropsSI" (ByVal output As String, ByVal Name1 As String, ByVal Value1 As Double, ByVal Name2 As String, ByVal Value2 As Double, ByVal Ref As String) As Double
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
'put your stuff here
End Sub
Public Function PropsSI(ByVal output As String, ByVal Name1 As String, ByVal Value1 As Double, ByVal Name2 As String, ByVal Value2 As Double, ByVal fluid As String) returns Double
PropsSI_temp = PropsSI_private(output, Name1, Value1, Name2, Value2, fluid)
If Math.Abs(PropsSI_temp) > 1.0E+30 Then
Return 0
Else
Return PropsSI_temp
End If
End Function
End Class
Ian Bell
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Alessandro Mandelli
Alessandro Mandelli
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Alessandro Mandelli
The missing entry points were caused by decoration of the names of the Functions and Subs at compile time.
----
Imports System.Runtime.InteropServices
Public Class Principale
<DllImport("Coolprop.dll", EntryPoint:="CSharp_PropsSI")>
Public Shared Function PropsSI(ByVal output As String, ByVal Name1 As String, ByVal Value1 As Double,
ByVal Name2 As String, ByVal Value2 As Double, ByVal Ref As String) As Double
<DllImport("Coolprop.dll", EntryPoint:="CSharp_set_reference_stateS")>
Public Shared Sub set_reference_stateS(ByVal in1 As String, ByVal in2 As String)
End Sub
Function myTest(ByVal temp As Single) As Double
set_reference_stateS("R134A", "IIR")
entin = PropsSI("H", "T", SuctionTempNumericUpDownSummer.Value + 273.15, "Q", 6, "R134A")
Ian Bell
Alessandro Mandelli
Ian Bell
Spiz103
Module Module1
Private Declare Function PropsSI_private Lib "C:\CoolProp\CoolProp-x64.dll" Alias "PropsSI" (ByVal ReturnValue As String, ByVal Name1 As String, ByVal Value1 As Double, ByVal Name2 As String, ByVal Value2 As Double, ByVal Ref As String) As Double
Private Declare Function Props1SI_private Lib "C:\CoolProp\CoolProp-x64.dll" Alias "Props1SI" (ByVal Ref As String, ByVal ReturnValue As String) As Double
Private Declare Function HAProps_private Lib "C:\CoolProp\CoolProp-x64.dll" Alias "HAProps" (ByVal ReturnValue As String, ByVal Input1Name As String, ByVal Value1 As Double, ByVal Input2Name As String, ByVal Value2 As Double, ByVal Input3name As String, ByVal Value3 As Double) As Double
Public Function PropsSI(ByVal ReturnValue As String, ByVal Name1 As String, ByVal Value1 As Double, ByVal Name2 As String, ByVal Value2 As Double, ByVal Ref As String) As Double
PropsSI = PropsSI_private(ReturnValue, Name1, Value1, Name2, Value2, Ref)
End Function
Public Function Props1SI(ByVal Ref As String, ByVal ReturnValue As String) As Double
Props1SI = Props1SI_private(Ref, ReturnValue)
End Function
Public Function HAProps(ByVal ReturnValue As String, ByVal Input1Name As String, ByVal Value1 As Double, ByVal Input2Name As String, ByVal Value2 As Double, ByVal Input3name As String, ByVal Value3 As Double) As Double
HAProps = HAProps_private(ReturnValue, Input1Name, Value1, Input2Name, Value2, Input3name, Value3)
End Function
Sub Main()
Console.WriteLine(PropsSI("T", "P", 101325, "Q", 0, "Water"))
End Sub
End ModuleAlessandro Mandelli
Alessandro Mandelli
Technical support group coordinator
alessandr...@costergroup.eu
Sede legale/operativa Milano: Via San G.B. De La Salle 4/A 20132 Milano Tel:+39.02.2722121 Fax: +39.02.2593645
Coster Group s.r.l.
Risparmio e Contabilizzazione Energia - Building Automation - Monitoring - Remote Control
Sede operativa Novi Ligure: Via Trattati di Maastricht, 32 15067 Novi Ligure (AL) Tel. +39 0143 329717 Fax +39 0143329707
Sede operativa Roma: Via Stefano Longanesi 14 00146 Roma Tel:+39 065534191 Fax: +39.06.5566517
Stabilimento e Spedizioni: Via Gen. Treboldi, 190/192 - 25048 Edolo (BS)
Indirizzo PEC: coste...@pec.it
Numero REA: MI - 2108989
C. F. e P.I. : 09712950964
Le informazioni contenute in questa e-mail sono ad uso esclusivo del destinatario indicato e coperte dal segreto professionale.
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