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Add sample for hosting WinForms inside native DLL
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‎.gitignore

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# Ionide settings
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symbolCache.db
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/samples/HostedWindowsForms/loader.exe

‎WinFormsComInterop.sln

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@@ -52,6 +52,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.Web.WebView2.Core
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EndProject
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Project("{778DAE3C-4631-46EA-AA77-85C1314464D9}") = "SampleVisualBasic", "samples\SampleVisualBasic\SampleVisualBasic.vbproj", "{C5613BDA-F0DF-47DA-B76E-6C477AA61DB1}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "HostedWindowsForms", "samples\HostedWindowsForms\HostedWindowsForms.csproj", "{A648922A-2FC4-4B8D-BD83-BDA4671FF82D}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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{C5613BDA-F0DF-47DA-B76E-6C477AA61DB1}.Release|x64.Build.0 = Release|Any CPU
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{C5613BDA-F0DF-47DA-B76E-6C477AA61DB1}.Release|x86.ActiveCfg = Release|Any CPU
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{C5613BDA-F0DF-47DA-B76E-6C477AA61DB1}.Release|x86.Build.0 = Release|Any CPU
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{A648922A-2FC4-4B8D-BD83-BDA4671FF82D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{A648922A-2FC4-4B8D-BD83-BDA4671FF82D}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{A648922A-2FC4-4B8D-BD83-BDA4671FF82D}.Debug|arm64.ActiveCfg = Debug|Any CPU
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{A648922A-2FC4-4B8D-BD83-BDA4671FF82D}.Debug|arm64.Build.0 = Debug|Any CPU
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{A648922A-2FC4-4B8D-BD83-BDA4671FF82D}.Debug|x64.ActiveCfg = Debug|Any CPU
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{A648922A-2FC4-4B8D-BD83-BDA4671FF82D}.Debug|x64.Build.0 = Debug|Any CPU
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{A648922A-2FC4-4B8D-BD83-BDA4671FF82D}.Debug|x86.ActiveCfg = Debug|Any CPU
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{A648922A-2FC4-4B8D-BD83-BDA4671FF82D}.Debug|x86.Build.0 = Debug|Any CPU
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{A648922A-2FC4-4B8D-BD83-BDA4671FF82D}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{A648922A-2FC4-4B8D-BD83-BDA4671FF82D}.Release|Any CPU.Build.0 = Release|Any CPU
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{A648922A-2FC4-4B8D-BD83-BDA4671FF82D}.Release|arm64.ActiveCfg = Release|Any CPU
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{A648922A-2FC4-4B8D-BD83-BDA4671FF82D}.Release|arm64.Build.0 = Release|Any CPU
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{A648922A-2FC4-4B8D-BD83-BDA4671FF82D}.Release|x64.ActiveCfg = Release|Any CPU
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{A648922A-2FC4-4B8D-BD83-BDA4671FF82D}.Release|x64.Build.0 = Release|Any CPU
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{A648922A-2FC4-4B8D-BD83-BDA4671FF82D}.Release|x86.ActiveCfg = Release|Any CPU
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{A648922A-2FC4-4B8D-BD83-BDA4671FF82D}.Release|x86.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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{36317E5D-29E1-4622-AC0A-F2A99C29CE1C} = {B8E0DDAA-1A19-409C-AD36-7B32A997446A}
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{B6EFF1A5-63B5-4A05-9B9A-410BA94B92AA} = {B446ED5F-1D77-4709-AFBB-F5CAE585B964}
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{C5613BDA-F0DF-47DA-B76E-6C477AA61DB1} = {B8E0DDAA-1A19-409C-AD36-7B32A997446A}
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{A648922A-2FC4-4B8D-BD83-BDA4671FF82D} = {B8E0DDAA-1A19-409C-AD36-7B32A997446A}
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {E6AF9777-3A1E-4FF6-A531-49CD8D66A293}

‎samples/HostedWindowsForms/HostedWindowsForms.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net7.0-windows</TargetFramework>
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<Nullable>enable</Nullable>
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<UseWindowsForms>true</UseWindowsForms>
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<ImplicitUsings>enable</ImplicitUsings>
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<_SuppressWinFormsTrimError>true</_SuppressWinFormsTrimError>
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</PropertyGroup>
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<PropertyGroup>
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<PublishAot>true</PublishAot>
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</PropertyGroup>
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</Project>

‎samples/HostedWindowsForms/LibraryFunctions.cs

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using System.Runtime.InteropServices;
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namespace HostedWindowsForms;
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internal static class LibraryFunctions
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{
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/// <summary>
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/// The main entry point for the application.
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/// </summary>
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[UnmanagedCallersOnly(EntryPoint = nameof(ShowMessageBox))]
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public static void ShowMessageBox()
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{
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// Application configuration does not work in library project.
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Application.SetHighDpiMode(HighDpiMode.PerMonitorV2);
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Application.EnableVisualStyles();
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Application.Run(new MainForm());
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}
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}

‎samples/HostedWindowsForms/MainForm.Designer.cs

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‎samples/HostedWindowsForms/MainForm.cs

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namespace HostedWindowsForms
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{
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public partial class MainForm : Form
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{
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public MainForm()
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{
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InitializeComponent();
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}
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private void buttonPressMe_Click(object sender, EventArgs e)
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{
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MessageBox.Show("We are inside Winforms and it feels great", "WinForms + NativeAOT");
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}
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}
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}

‎samples/HostedWindowsForms/MainForm.resx

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<root>
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<xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
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<xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
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<xsd:element name="root" msdata:IsDataSet="true">
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<xsd:complexType>
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<xsd:choice maxOccurs="unbounded">
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<xsd:element name="metadata">
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<xsd:complexType>
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<xsd:sequence>
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<xsd:element name="value" type="xsd:string" minOccurs="0" />
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</xsd:sequence>
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<xsd:attribute name="name" use="required" type="xsd:string" />
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<xsd:attribute name="type" type="xsd:string" />
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<xsd:attribute name="mimetype" type="xsd:string" />
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<xsd:attribute ref="xml:space" />
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</xsd:complexType>
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</xsd:element>
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<xsd:element name="assembly">
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<xsd:complexType>
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<xsd:attribute name="alias" type="xsd:string" />
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<xsd:attribute name="name" type="xsd:string" />
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</xsd:complexType>
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</xsd:element>
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<xsd:element name="data">
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<xsd:complexType>
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<xsd:sequence>
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<xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
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<xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
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</xsd:sequence>
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<xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
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<xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
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<xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
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<xsd:attribute ref="xml:space" />
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</xsd:complexType>
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</xsd:element>
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<xsd:element name="resheader">
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<xsd:complexType>
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<xsd:sequence>
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<xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
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</xsd:sequence>
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<xsd:attribute name="name" type="xsd:string" use="required" />
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</xsd:complexType>
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</xsd:element>
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</xsd:choice>
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</xsd:complexType>
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</xsd:element>
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</xsd:schema>
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<resheader name="resmimetype">
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<value>text/microsoft-resx</value>
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</resheader>
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<resheader name="version">
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<value>2.0</value>
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</resheader>
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<resheader name="reader">
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<value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
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</resheader>
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<resheader name="writer">
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<value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
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</resheader>
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</root>

‎samples/HostedWindowsForms/README.md

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WinForms hosted in DLL
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======================
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This sample show steps required to put WinForms inside native DLL.
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## How to build
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Inside `x64 Native Tools Command Prompt for VS 2022` command line run following commands
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```
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dotnet publish -r win-x64 --self-contained
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cl .\loader.c /Z7
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```
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after that you can run `loader.exe` which will show form.

‎samples/HostedWindowsForms/loader.c

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#define PathToLibrary "bin\\Debug\\net7.0-windows\\win-x64\\publish\\HostedWindowsForms.dll"
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#define PathToLibrary2 "bin\\x64\\Debug\\net7.0-windows\\win-x64\\publish\\HostedWindowsForms.dll"
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#include "windows.h"
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#define symLoad GetProcAddress
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#include <stdlib.h>
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#include <stdio.h>
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#ifndef F_OK
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#define F_OK 0
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#endif
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void showMessageBox();
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int main()
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{
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// Check if the library file exists
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if (access(PathToLibrary, F_OK) == -1 && access(PathToLibrary2, F_OK) == -1)
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{
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puts("Couldn't find library at the specified path");
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return 0;
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}
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// Sum two integers
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showMessageBox();
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}
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void showMessageBox()
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{
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// Call sum function defined in C# shared library
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HINSTANCE handle = LoadLibraryA(PathToLibrary);
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if (!handle)
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{
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handle = LoadLibraryA(PathToLibrary2);
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}
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if (!handle)
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{
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int errorCode = GetLastError();
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printf("Failed to load library at specified path. Error code: %d\n", errorCode);
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return;
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}
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typedef void(*ShowMessageBoxFuncType)();
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ShowMessageBoxFuncType ShowMessageBox = (ShowMessageBoxFuncType)symLoad(handle, "ShowMessageBox");
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ShowMessageBox();
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}

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