Começando com o ActiveX

Primeiro guia de criação de ActiveX no Visual Studio C#

Etapas de criação

  1. Inicie o Visual Studio 2013 como administrador
  2. Instale a extensão do Visual Studio Microsoft Visual Studio Installer Projects
  3. Crie um projeto de biblioteca de classes (WinFormActivex)
  4. Crie seu formulário de janela de exemplo (MainWindow)
  5. Crie uma nova interface de componente (ILauncher)
  6. Crie uma nova interface de segurança (IObjectSafety)
  7. Crie o controle de componente (Launcher) que implementa interfaces e ative a janela.
  8. Verifique se todos os GUIDs são gerados por você
  9. Verifique se o projeto está marcado para COM
  10. Crie o projeto de instalação (LauncherInstaller) com a saída primária do WinFormActivex com a propriedade Register = vsdrpCOM
  11. Instale o LauncherInstaller
  12. Execute sua página de teste no explorer (test.html)

Janela principal Você pode criar um formulário normal, aqui é pré-gerado.

public partial class MainWindow : Form
{
    public MainWindow()
    {
        InitializeComponent();
    }

    /// <summary>
    /// Required designer variable.
    /// </summary>
    private System.ComponentModel.IContainer components = null;

    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
    protected override void Dispose(bool disposing)
    {
        if (disposing && (components != null))
        {
            components.Dispose();
        }
        base.Dispose(disposing);
    }

    #region Windows Form Designer generated code

    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
        this.textBox1 = new System.Windows.Forms.TextBox();
        this.textBox2 = new System.Windows.Forms.TextBox();
        this.SuspendLayout();
        //
        // textBox1
        //
        this.textBox1.Location = new System.Drawing.Point(42, 23);
        this.textBox1.Name = "textBox1";
        this.textBox1.Size = new System.Drawing.Size(100, 20);
        this.textBox1.TabIndex = 0;
        //
        // textBox2
        //
        this.textBox2.Location = new System.Drawing.Point(42, 65);
        this.textBox2.Name = "textBox2";
        this.textBox2.Size = new System.Drawing.Size(100, 20);
        this.textBox2.TabIndex = 0;
        //
        // MainWindow
        //
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(284, 261);
        this.Controls.Add(this.textBox2);
        this.Controls.Add(this.textBox1);
        this.Name = "MainWindow";
        this.Text = "MainWindow";
        this.ResumeLayout(false);
        this.PerformLayout();

    }

    #endregion

    private System.Windows.Forms.TextBox textBox1;
    private System.Windows.Forms.TextBox textBox2;
}

I Launcher

using System.Runtime.InteropServices;
namespace WinFormActivex
{
    [ComVisible(true)]
    [InterfaceType(ComInterfaceType.InterfaceIsDual)]
    [Guid("94D26775-05E0-4B9C-BC73-C06FE915CF89")]
    public interface ILauncher
    {
        void ShowWindow();
    }
}

IObjectSafety

[ComImport()]
[Guid("51105418-2E5C-4667-BFD6-50C71C5FD15C")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
interface IObjectSafety
{
    [PreserveSig()]
    int GetInterfaceSafetyOptions(ref Guid riid, out int pdwSupportedOptions, out int pdwEnabledOptions);
    [PreserveSig()]
    int SetInterfaceSafetyOptions(ref Guid riid, int dwOptionSetMask, int dwEnabledOptions);
    }

Lançador Por favor, gere seu GUID aqui.

 [ComVisible(true)]
 [ClassInterface(ClassInterfaceType.None)]
 [Guid("D100C392-030A-411C-92B6-4DBE9AC7AA5A")]
 [ProgId("WinFormActivex.Launcher")]
 [ComDefaultInterface(typeof(ILauncher))]
 public class Launcher : UserControl, ILauncher, IObjectSafety
 {
     #region [ ILauncher ]

     public void ShowWindow()
     {
         var f = new MainWindow();
         f.StartPosition = FormStartPosition.Manual;
         f.Location = Screen.AllScreens[0].Bounds.Location;
         f.WindowState = FormWindowState.Normal;
         f.WindowState = FormWindowState.Maximized;
         f.ShowInTaskbar = false;
         f.Show();
     }

     #endregion

     #region [ IObjectSafety ]

     public enum ObjectSafetyOptions
     {
         INTERFACESAFE_FOR_UNTRUSTED_CALLER = 0x00000001,
         INTERFACESAFE_FOR_UNTRUSTED_DATA = 0x00000002,
         INTERFACE_USES_DISPEX = 0x00000004,
         INTERFACE_USES_SECURITY_MANAGER = 0x00000008
     };

     public int GetInterfaceSafetyOptions(ref Guid riid, out int pdwSupportedOptions, out int pdwEnabledOptions)
     {
         ObjectSafetyOptions m_options = ObjectSafetyOptions.INTERFACESAFE_FOR_UNTRUSTED_CALLER | ObjectSafetyOptions.INTERFACESAFE_FOR_UNTRUSTED_DATA;
         pdwSupportedOptions = (int)m_options;
         pdwEnabledOptions = (int)m_options;
         return 0;
     }

     public int SetInterfaceSafetyOptions(ref Guid riid, int dwOptionSetMask, int dwEnabledOptions)
     {
         return 0;
     }

     #endregion
 }

test.html Verifique se o seu CLSID corresponde ao GUID (Launcher).

<html>
    <head>
        <objectname="activexLauncher" style='display:none' id='activexLauncher' classid='CLSID:D100C392-030A-411C-92B6-4DBE9AC7AA5A' codebase='WinFormActivex'></object>
      <script language="javascript">
        <!-- Load the ActiveX object  -->
        var x = new ActiveXObject("WinFormActivex.Launcher");
        alert(x.GetText());
      </script>
    </head>
    <body>
    </body>
</html>

Referências