My problem is that I'm trying to use Python.NET inside Visual Studio, I installed Python 3.5, and the python.NET package trough nuget and trough pip too.
added namespace Python.Runtime in my Form application, and the Python.Runtime.dll is there in the references too.
I tried to use a sample code from the offical site: offical site
using Python.Runtime;
// create a person object
Person person = new Person("John", "Smith");
// acquire the GIL before using the Python interpreter
using (Py.GIL())
{
// create a Python scope
using (PyScope scope = Py.CreateScope())
{
// convert the Person object to a PyObject
PyObject pyPerson = person.ToPython();
// create a Python variable "person"
scope.Set("person", pyPerson);
// the person object may now be used in Python
string code = "fullName = person.FirstName + ' ' + person.LastName";
scope.Exec(code);
}
}
The Py.GIL() part works and I already tried to import numpy package and do some basic calculations with it, it worked well.
However the PyScope is just not recognized, nor do Py.CreateScope.
("The type or namespace PyScope could not be found")
Tried to write Python.Runtime.PyScope, tried reinstalling, tried older package, used console app and winforms app too, however nothing seems to work.
Am I missing something here?
I ran into this problem too. Using var instead of PyScope worked for me. As in:
using (var scope = Py.CreateScope())
Edit & Alternative: when I visited the definition of CreateScope(), the output type was PyModule:
public static PyModule CreateScope();
public static PyModule CreateScope(string name);
Using this instead of var also works for me:
using (PyModule scope = Py.CreateScope())
If that doesn't work for you, visiting the definition of the function and using the output type listed in your version likely will.
The var isn't picky though.
I found a way to call .NET 2 code directly from VBA code:
Dim clr As mscoree.CorRuntimeHost
Set clr = New mscoree.CorRuntimeHost
clr.Start
Dim domain As mscorlib.AppDomain
clr.GetDefaultDomain domain
Dim myInstanceOfDotNetClass As Object
Set myInstanceOfDotNetClass = domain.CreateInstanceFrom("SomeDotNetAssembly.dll", "Namespace.Typename").Unwrap
Call myInstanceOfDotNetClass.ExecuteSomeDotNetMethod
I added references to mscoree.tlb and mscorlib.tlb to Excel VBA using Tools -> References.
This works for .NET CLR 2 assemblies, up to .NET framework version 3.5.
I need to make it work with .NET 4.
I understood that .NET CLR4 introduced another, version agnostic, way of creating an instance of the runtime and I have found a code example written in C++:
http://dev.widemeadows.de/2014/02/04/hosting-the-net-4-runtime-in-a-native-process/
My Excel VBA skills are not enough to translate those few lines of code.
Here is a canonical answer on the 3 main methods to call .Net from Excel (or VBA).
All three ways work in .Net 4.0.
1. XLLs
The 3rd party vendor Add-In Express offer XLL functionality, however its free and easy to use Excel-DNA the author is here https://stackoverflow.com/users/44264
Here is an extract from the Excel-DNA page: https://excel-dna.net/
Introduction
Excel-DNA is an independent project to integrate .NET into Excel. With Excel-DNA you can make native (.xll) add-ins for Excel using C#, Visual Basic.NET or F#, providing high-performance user-defined functions (UDFs), custom ribbon interfaces and more. Your entire add-in can be packed into a single .xll file requiring no installation or registration.
Getting Started
If you are using a version of Visual Studio that supports the NuGet Package Manager (including Visual Studio 2012 Express for Windows Desktop), the easiest way to make an Excel-DNA add-in is to:
Create a new Class Library project in Visual Basic, C# or F#.
Use the Manage NuGet Packages dialog or the Package Manager Console to install the Excel-DNA package:
PM> Install-Package Excel-DNA
Add your code (C#, Visual Basic.NET or F#):
using ExcelDna.Integration;
public static class MyFunctions
{
[ExcelFunction(Description = "My first .NET function")]
public static string SayHello(string name)
{
return "Hello " + name;
}
}
Compile, load and use your function in Excel:
=SayHello("World!")
2. Automation AddIns
This article by Eric Carter shows how to do it, the article is missing heaps of images so I am copy / pasting the entire article and have recreated the images for preservation.
REF: https://blogs.msdn.microsoft.com/eric_carter/2004/12/01/writing-user-defined-functions-for-excel-in-net/
Excel enables the creation of user defined functions that can be used in Excel formulas. A developer must create a special kind of DLL called an XLL. Excel also allows you to write custom functions in VBA that can be used in Excel formulas. Unfortunately, Excel does not support or recommend writing an XLL that uses managed code. If you are willing to take your chances that your XLL might not run in current or future versions of Excel, there are solutions available that enable this scenario—search the web for “managed XLL”.
Fortunately, there is an easier way to create a user defined function that doesn’t require you to create an XLL dll. Excel XP, Excel 2003, and Excel 2007 support something called an Automation Add-in. An Automation Add-in can be created quite simply in C# or VB.NET. I’m going to show you an example in C#.
First, launch Visual Studio and create a new C# class library project called AutomationAddin for this example.
Then, in your Class1.cs file, enter the code shown below. Replace the GUID with your own GUID that you create by using Generate GUID in the Tools menu of Visual Studio.
using System;
using System.Runtime.InteropServices;
using Microsoft.Win32;
namespace AutomationAddin
{
// Replace the Guid below with your own guid that
// you generate using Create GUID from the Tools menu
[Guid("A33BF1F2-483F-48F9-8A2D-4DA68C53C13B")]
[ClassInterface(ClassInterfaceType.AutoDual)]
[ComVisible(true)]
public class MyFunctions
{
public MyFunctions()
{
}
public double MultiplyNTimes(double number1, double number2, double timesToMultiply)
{
double result = number1;
for (double i = 0; i < timesToMultiply; i++)
{
result = result * number2;
}
return result;
}
[ComRegisterFunctionAttribute]
public static void RegisterFunction(Type type)
{
Registry.ClassesRoot.CreateSubKey(GetSubKeyName(type, "Programmable"));
RegistryKey key = Registry.ClassesRoot.OpenSubKey(GetSubKeyName(type, "InprocServer32"), true);
key.SetValue("", System.Environment.SystemDirectory + #"\mscoree.dll",RegistryValueKind.String);
}
[ComUnregisterFunctionAttribute]
public static void UnregisterFunction(Type type)
{
Registry.ClassesRoot.DeleteSubKey(GetSubKeyName(type, "Programmable"), false);
}
private static string GetSubKeyName(Type type, string subKeyName)
{
System.Text.StringBuilder s = new System.Text.StringBuilder();
s.Append(#"CLSID\{");
s.Append(type.GUID.ToString().ToUpper());
s.Append(#"}\");
s.Append(subKeyName);
return s.ToString();
}
}
}
With this code written, show the properties for the project by double clicking on the properties node under the project in Solution Explorer. Click on the Build tab and check the check box that says “Register for COM Interop”. At this point you have an extra step if you are running on Windows Vista or higher. Visual Studio has to be run with administrator privileges to register for COM interop. Save your project and exit Visual Studio. Then find Visual Studio in the Start menu and right click on it and choose “Run as Administrator”. Reopen your project in Visual Studio. Then choose “Build” to build the add-in.
Now launch Excel and get to the Automation servers dialog by following these steps:
Launch Excel and click the Microsoft Office button in the top left corner of the window.
Choose Excel Options.
Click the Add-Ins tab in the Excel Options dialog.
Choose Excel Add-Ins from the combo box labeled Manage. Then click the Go button.
Click the Automation button in the Add-Ins dialog.
You can find the class you created by looking for AutomationAddin.MyFunctions in the list of Automation add-ins:
Now, let’s try to use the function MultiplyNTimes inside Excel. First create a simple spreadsheet that has a number, a second number to multiple the first by, and a third number for how many times you want to multiply the first number by the second number. An example spreadsheet is shown here:
Click on an empty cell in the workbook below the numbers and then click on the Insert Function button in the formula bar. From the dialog of available formulas, drop down the “Or select a category” drop down box and choose “AutomationAddin.MyFunctions.
Then click on the MultiplyNTimes function as shown here:
When you press the OK button, Excel pops up a dialog to help you grab function arguments from the spreadsheet as shown here:
Finally, click OK and see your final spreadsheet as shown here with your custom formula in cell C3.
3. Calling .Net from Excel VBA
Using the code from the Automation.AddIn project we can easily call the MultiplyNTimes function from Excel VBA.
First Add a reference to the DLL from Excel, to do this you will need to be in the VB Editor. Press Alt + F11, then click Tools menu and References:
Select the AutomationAddIn DLL:
Add VBA code to call the .Net DLL:
Sub Test()
Dim dotNetClass As AutomationAddIn.MyFunctions
Set dotNetClass = New AutomationAddIn.MyFunctions
Dim dbl As Double
dbl = dotNetClass.MultiplyNTimes(3, 2, 5)
End Sub
And hey presto!
Please note if you're working with Classes in C# you will need to mark them with ClassInterface, with an Interface marked with ComVisible = true: Use CLR classes from COM addin in Excel VBA?
Finally there are some excellent MSDN articles about Excel and .Net by "Andrew Whitechapel" - google them
The default policy is preventing the CLR 4 from excuting the legacy code from the CLR 2 :
Set clr = New mscoree.CorRuntimeHost
To enable the legacy execution, you can either create the file excel.exe.config in the folder where excel.exe is located:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime version="v4.0"/>
</startup>
</configuration>
Or you can call the native function CorBindToRuntimeEx instead of New mscoree.CorRuntimeHost :
Private Declare PtrSafe Function CorBindToRuntimeEx Lib "mscoree" ( _
ByVal pwszVersion As LongPtr, _
ByVal pwszBuildFlavor As LongPtr, _
ByVal startupFlags As Long, _
ByRef rclsid As Long, _
ByRef riid As Long, _
ByRef ppvObject As mscoree.CorRuntimeHost) As Long
Private Declare PtrSafe Function VariantCopy Lib "oleaut32" (dest, src) As Long
''
' Creates a .Net object with the CLR 4 without registration. '
''
Function CreateInstance(assembly As String, typeName As String) As Variant
Const CLR$ = "v4.0.30319"
Static domain As mscorlib.AppDomain
If domain Is Nothing Then
Dim host As mscoree.CorRuntimeHost, hr&, T&(0 To 7)
T(0) = &HCB2F6723: T(1) = &H11D2AB3A: T(2) = &HC000409C: T(3) = &H3E0AA34F
T(4) = &HCB2F6722: T(5) = &H11D2AB3A: T(6) = &HC000409C: T(7) = &H3E0AA34F
hr = CorBindToRuntimeEx(StrPtr(CLR), 0, 3, T(0), T(4), host)
If hr And -2 Then err.Raise hr
host.Start
host.GetDefaultDomain domain
End If
VariantCopy CreateInstance, domain.CreateInstanceFrom(assembly, typeName).Unwrap
End Function
Here's your solution, tested for .NET 2.0 and .NET 4.0, 32 bit and 64 bit, courtesy of Soraco Technologies.
The solution proposed below uses late binding and does not require registration of the .NET assemblies.
Declarations
Add the following declarations to your project:
#If VBA7 Then
Private Declare PtrSafe Function GetShortPathName Lib “Kernel32.dll” Alias “GetShortPathNameW” (ByVal LongPath As LongPtr, ByVal ShortPath As LongPtr, ByVal Size As Long) As Long
Private Declare PtrSafe Function SetDllDirectory Lib “Kernel32.dll” Alias “SetDllDirectoryW” (ByVal Path As LongPtr) As Long
Private Declare PtrSafe Sub LoadClr_x64 Lib “QlmCLRHost_x64.dll” (ByVal clrVersion As String, ByVal verbose As Boolean, ByRef CorRuntimeHost As IUnknown)
Private Declare PtrSafe Sub LoadClr_x86 Lib “QlmCLRHost_x86.dll” (ByVal clrVersion As String, ByVal verbose As Boolean, ByRef CorRuntimeHost As IUnknown)
#Else
Private Declare Function GetShortPathName Lib “Kernel32.dll” Alias “GetShortPathNameW” (ByVal LongPath As Long, ByVal ShortPath As Long, ByVal Size As Long) As Long
Private Declare Function SetDllDirectory Lib “Kernel32.dll” Alias “SetDllDirectoryW” (ByVal Path As Long) As Long
Private Declare Sub LoadClr_x64 Lib “QlmCLRHost_x64.dll” (ByVal clrVersion As String, ByVal verbose As Boolean, ByRef CorRuntimeHost As IUnknown)
Private Declare Sub LoadClr_x86 Lib “QlmCLRHost_x86.dll” (ByVal clrVersion As String, ByVal verbose As Boolean, ByRef CorRuntimeHost As IUnknown)
#End If ‘ WinAPI Declarations
' Declare variables
Dim m_myobject As Object
Dim m_homeDir As String
Initialization
You must initialize the m_homeDir variable to the path where the .NET assemblies are located.
For example, if you install the .NET assemblies in the same folder as the Excel or MS-Access files, you should initialize m_homeDir to:
Excel: m_homeDir = ThisWorkbook.Path
Access: m_homeDir = CurrentProject.Path
.NET Object Creation
Add the following code to your project.
Private Function GetMyObject(dllPath As String, dllClass As String) As Object
Dim LongPath As String
Dim ShortPath As String
LongPath = “\\?\” & m_homeDir
ShortPath = String$(260, vbNull)
PathLength = GetShortPathName(StrPtr(LongPath), StrPtr(ShortPath), 260)
ShortPath = Mid$(ShortPath, 5, CLng(PathLength – 4))
Call SetDllDirectory(StrPtr(ShortPath))
Dim clr As mscoree.CorRuntimeHost
If Is64BitApp() Then
Call LoadClr_x64(“v4.0”, False, clr)
Else
Call LoadClr_x86(“v4.0”, False, clr)
End If
Call clr.Start
Dim domain As mscorlib.AppDomain
Call clr.GetDefaultDomain(domain)
Dim myInstanceOfDotNetClass As Object
Dim handle As mscorlib.ObjectHandle
Set handle = domain.CreateInstanceFrom(dllPath, dllClass)
Dim clrObject As Object
Set GetMyObject = handle.Unwrap
Call clr.Stop
End Function
Private Function Is64BitApp() As Boolean
#If Win64 Then
Is64BitApp = True
#End If
End Function
Instantiate the .NET object
Now you are ready to instantiate your .NET object and start using it. Add the following code to your application:
m_homeDir = ThisWorkbook.Path
m_myobject = GetMyObject(m_homeDir & “\yourdotnet.dll”, “namespace.class”)
The first argument is the full path to the .NET DLL.
The second argument is the fully qualified name of the requested type, including the namespace but not the assembly, as returned by the Type.FullName property.
Required DLLs
The solution requires deployment of 2 DLLs that are responsible for hosting the .NET CLR. The DLLs are expected to be deployed in the same folder as your Excel or MS-Access file.
The DLLs can be downloaded from Soraco’s web site: https://soraco.co/products/qlm/QLMCLRHost.zip
Licensing LGPL-2.1
We hereby grant you the right to use our DLLs as long as your application does not compete directly or indirectly with Quick License Manager. You can use these DLLs in your commercial or non-commercial applications.
I'm not sure if this was just a coincidence or because I posted related question. SO showed me your question and I think I could also contribute something.
When working with VBA and DLL, most solutions that I've seen so far is telling me to register the DLL and make it com/gac visible. If you are doing this in your PC that's absolutely fine but if you are distributing your VBA application, you don't really want to install DLLs in their system. You might not have permission or you don't really want to go through install/uninstall process or messing with referencing issues.
However you can load dlls dynamically using some windows APIs.
DLL
Now the question is how to access .NET dll from vba? if your clients have mixed os architecture x86 x64 you need to handle this accordingly. Lets assume we are working on 32bit office/Excel.
If you create a .NET dll and would like to access it from VBA it will throw an error message similar to "Can't find the dll entry point". thankfully Robert Giesecke has created an abstract wrapper which will allow you to create simple DLL consumable via VBA.
A template can be found here.
All you have to do
Create a new class project in visual studio
Set the project platform either x86 for 32bit and otherwise
Create your methods within a main class.
create another class which will return your main class as object (is returning to vba)
(follow the template from his website)
Lets assume you have followed his template and created a test method as following.
[ComVisible(true), ClassInterface(ClassInterfaceType.AutoDual)]
public class YOUR_MAIN_CLASS
{
[return: MarshalAs(UnmanagedType.BStr)]
public string FN_RETURN_TEXT(string iMsg)
{
return "You have sent me: " + iMsg + "...";
}
}
and your unmanagedexport class:
static class UnmanagedExports
{
[DllExport]
[return: MarshalAs(UnmanagedType.IDispatch)]
static object YOUR_DLL_OBJECT()
{
return new YOUR_MAIN_CLASS();
}
}
Preparing to access the dll from vba side
Add the DLL to your root folder:
#If VBA7 Then
Public Declare PtrSafe Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As LongPtr
Public Declare PtrSafe Function YOUR_DLL_OBJECT Lib "YOUR_DLL.dll" () As Object
#Else
Public Declare Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal strFilePath As String) As Long
Public Declare Function YOUR_DLL_OBJECT Lib "YOUR_DLL.dll" () As Object
#End If
Now It's all about loading the dll and creating & accessing objects it in vba.
that would be:
LoadLibrary (FN_APP_GET_BASE_PATH & "YOUR_DLL.dll")
dim mObj as object
set mObj = YOUR_DLL_OBJECT()
debug.print mObj.FN_RETURN_TEXT("Testing ..")
the output should be
"You have sent me: Testing ....."
Advantages
I personally don't like installing and referencing dlls. By following above template, you don't need to reference anything, you don't need to install anything just load and work with your the DLL with full freedom.
NOTE: I assume the dll/.net code is yours and you can compile it again with above templates to.
I had success with above template and created a .NET non-blocking notifications for vba you can have a look here: non-blocking "toast" like notifications for Microsoft Access (VBA)
I need to add new functionality to vba in access. I already tried a lot of tutorials:
http://www.office-loesung.de/ftopic268792_0_0_asc.php (german) and
http://www.codeproject.com/Articles/555660/Extend-your-VBA-code-with-Csharp-VB-NET-or-Cpluspl (cant post more cause of rep)
but none of them works for me. The customer has office 2013 and i am using .net 4.5.
We want to provide the customer a rest api which is already written in c#/.net and which needs some encryption dlls of the .net world.
I tried to create an dll with "Interop COM" switch on and could add a reference of the dll to my VBA test Sheet BUT neither objects nor static test functions have been working. There even is no intelisense in VBA. A restart of the program did not solve the problem either. (though somehting went wrong before)
The error message i retrieve is "Runtime Error 429 - ActiveX Component Can't Create Object" (for my own code as well as for the code from codeplex (with all modules, C#, VBA, C++/Cli))
Is there any other way to go, adding new functionality to VBA / extending it with own functions?
Okay so I finally found a way myself.
In this post calling managed c# functions from unmanaged c++ there is the NuGet Package Unmanaged Exports linked.
So I created a new C# DLL Project, inserted for testing purpose following code:
using RGiesecke.DllExport;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ClassLibrary1
{
internal static class Class1
{
[DllExport("square", CallingConvention = System.Runtime.InteropServices.CallingConvention.StdCall)]
static Double Square(Double dateValue)
{
return dateValue * dateValue;
}
[DllExport("test", CallingConvention = System.Runtime.InteropServices.CallingConvention.StdCall)]
static String Test()
{
return " ok";
}
[DllExport("mytest2", CallingConvention = System.Runtime.InteropServices.CallingConvention.StdCall)]
static void Test4(String doSomething)
{
// Manipulate (and obisously create new) String
doSomething += " ok";
}
}
}
Compiled this with x64 switch on, and created an VBA Sheet in excel with:
Option Explicit
Private Declare PtrSafe Function square Lib "C:\Users\<Name>\documents\visual studio 2013\Projects\ClassLibrary1\ClassLibrary1\bin\x64\Release\ClassLibrary1.dll" (ByVal dateValue As Double) As Double
Private Declare PtrSafe Function test Lib "C:\Users\<Name>\documents\visual studio 2013\Projects\ClassLibrary1\ClassLibrary1\bin\x64\Release\ClassLibrary1.dll" () As String
Private Declare PtrSafe Function mytest2 Lib "C:\Users\<Name>\documents\visual studio 2013\Projects\ClassLibrary1\ClassLibrary1\bin\x64\Release\ClassLibrary1.dll" (ByRef dateValue As String)
Private Sub CommandButton1_Click()
Dim zahl As Double
zahl = CInt(TextBox1.text)
zahl = square(zahl)
Label1.Caption = CStr(zahl)
Dim text As String
text = "This is"
mytest2 (text)
MsgBox text
End Sub
The only error I still get is when calling the test function. Returning an string seems to break excel. (Program instantly quits) But I think that should be solved in another question.
I'm trying to use an embedded python interpreter from C# using pythonnet (the python3 compatible version found at https://github.com/renshawbay/pythonnet)
My interpreter is located in D:\src\scratch\TestPythonNet\TestPythonNet\PythonRuntime and has the "Lib" and "Libs" folder from the python distribution.
I've tested using the following code:
<!-- language: c# -->
PythonEngine.PythonHome = #"D:\src\scratch\TestPythonNet\TestPythonNet\PythonRuntime";
PythonEngine.ProgramName = "PythonRuntime";
PythonEngine.Initialize();
using (Py.GIL())
{
PythonEngine.RunSimpleString("print(1)");
}
But, it doesn't work. I get a "SystemError: PyEvalCodeEx: NULL globals". Everytime I try to get an object from python, the code fails.
What am I doing wrong?
I think I've found the answer. If I add a reference to the "clr" module provided by pythonnet, it does work
PythonEngine.PythonHome = #"D:\src\scratch\TestPythonNet\TestPythonNet\PythonRuntime";
PythonEngine.ProgramName = "PythonRuntime";
PythonEngine.Initialize();
// ==>
PyObject a = PythonEngine.ImportModule("clr");
using (Py.GIL())
{
PythonEngine.RunSimpleString("print(1)");
}
I need to manipulate the VBA environment of an application from a C# addin so I can add modules, event handlers etc to documents that are created by the addin.
I've done it before in VB.Net but can't see how to get at the IDE object in C#. Am I just missing a reference or a Using directive? I can't see anything appropriate in the references.
In VB.Net I have a reference to Microsoft.VisualBasic and I have done this:
Imports System
Imports System.Collections.Generic
Imports System.Collections.ObjectModel
Public Module VBA
Private m_VBEnv As VBIDE.VBE
Private m_dlg As AddInDialog
Private Structure EventHandler
Public objectName As String
Public eventName As String
Public action As String
End Structure
Private m_handlers As New Collection
Public Function InitVBA(ByVal app As PBObjLib.Application, ByVal dlg As AddInDialog, ByVal scrWidth As Integer, ByVal scrHeight As Integer) As Boolean
InitVBA = False
Try
m_dlg = dlg
m_VBEnv = DirectCast(app.VBE, VBIDE.VBE)
m_VBEnv.MainWindow.Height = 480
m_VBEnv.MainWindow.Width = 640
m_VBEnv.MainWindow.Left = (scrWidth - m_VBEnv.MainWindow.Width)
m_VBEnv.MainWindow.Top = ((scrHeight - m_VBEnv.MainWindow.Height) - 50)
m_VBEnv.MainWindow.WindowState = VBIDE.vbext_WindowState.vbext_ws_Minimize ' .vbext_ws_Normal
HideVBWindow()
InitVBA = True
Catch e As Exception
dlg.LogMessage(AddInDialog.LogLevel.Err, "Failed to initialise VBA: " & e.Message)
End Try
End Function
...
End Module
I have added a reference to Microsoft.VisualBasic to my C# but it does not recognise VBIDE.VBE.
Also, how would I do the DirectCast bit in C#. Is it just a simple cast?
Any suggestions?
The answer was to ensure that all references were .NET references. I had a COM one hiding in there. I removed the VB related references, reloaded the project, added the references (all .NET this time) and it all came to life.