c#,winforms,.net-4.0,webbrowser-control , Implement IDownloadManger for my application only
Implement IDownloadManger for my application only
Question:
Tag: c#,winforms,.net-4.0,webbrowser-control
I'm using the WebBrowsercontrol in a WinForms application and have implemented my own download manager by following the instructions here.
My custom download manager works, but also overrides the download manager for Internet Explorer, too*. Is there a way to only have the custom download manager appear when my application is running? Or is there a way to unregistered it when my application closes?
*I appreciate that is precisely the point of implementing IDownloadManager, and the WebBrowser control is just, essentially, Internet Explorer (which is why I have gone down this route). The custom download manager provides exactly what I need, by allowing me to know what has been downloaded and where it has been downloaded to.
Answer:
After weeks of research, I have finally managed to piece it together. Posting this here in the hopes that it will save someone the trauma I've been through.
IServiceProvider.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
namespace BrowserExample
{
[ComImport, ComVisible(true)]
[Guid("6d5140c1-7436-11ce-8034-00aa006009fa")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
internal interface IServiceProvider
{
[return: MarshalAs(UnmanagedType.I4)]
[PreserveSig]
int QueryService(
[In] ref Guid guidService,
[In] ref Guid riid,
[Out] out IntPtr ppvObject);
}
}
IDownloadManager.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Runtime.InteropServices.ComTypes;
namespace BrowserExample
{
[ComVisible(false), ComImport]
[Guid("988934A4-064B-11D3-BB80-00104B35E7F9")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IDownloadManager
{
[return: MarshalAs(UnmanagedType.I4)]
[PreserveSig]
int Download(
[In, MarshalAs(UnmanagedType.Interface)] IMoniker pmk,
[In, MarshalAs(UnmanagedType.Interface)] IBindCtx pbc,
[In, MarshalAs(UnmanagedType.U4)] UInt32 dwBindVerb,
[In] int grfBINDF,
[In] IntPtr pBindInfo,
[In, MarshalAs(UnmanagedType.LPWStr)] string pszHeaders,
[In, MarshalAs(UnmanagedType.LPWStr)] string pszRedir,
[In, MarshalAs(UnmanagedType.U4)] uint uiCP);
}
}
DownloadManagerImplementation.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices.ComTypes;
using System.Windows.Forms;
namespace BrowserExample
{
[System.Runtime.InteropServices.ComVisible(true)]
[System.Runtime.InteropServices.Guid("bdb9c34c-d0ca-448e-b497-8de62e709744")]
public class DownloadManagerImplementation : IDownloadManager
{
/// <summary>
/// Return S_OK (0) so that IE will stop to download the file itself.
/// Else the default download user interface is used.
/// </summary>
public int Download(IMoniker pmk, IBindCtx pbc, uint dwBindVerb, int grfBINDF,
IntPtr pBindInfo, string pszHeaders, string pszRedir, uint uiCP)
{
// Get the display name of the pointer to an IMoniker interface that specifies
// the object to be downloaded.
string name = string.Empty;
pmk.GetDisplayName(pbc, null, out name);
if (!string.IsNullOrEmpty(name))
{
Uri url = null;
bool result = Uri.TryCreate(name, UriKind.Absolute, out url);
if (result)
{
//Implement your custom download manager here
//Example:
//WebDownloadForm manager = new WebDownloadForm();
//manager.FileToDownload = url.AbsoluteUri;
//manager.Show();
MessageBox.Show("Download URL is: " + url);
return 0; //Return S_OK
}
}
return 1; //unspecified error occured.
}
}
ExtendedBrowser.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace BrowserExample
{
public class ExtendedBrowser : WebBrowser
{
protected sealed class WebBrowserControlSite : WebBrowser.WebBrowserSite, IServiceProvider
{
DownloadManagerImplementation manager;
public WebBrowserControlSite(WebBrowser host)
: base(host)
{
manager = new DownloadManagerImplementation();
}
public int QueryService(ref Guid guidService, ref Guid riid, out IntPtr ppvObject)
{
Guid SID_SDownloadManager = new Guid("988934A4-064B-11D3-BB80-00104B35E7F9");
Guid IID_IDownloadManager = new Guid("988934A4-064B-11D3-BB80-00104B35E7F9");
if ((guidService == IID_IDownloadManager && riid == IID_IDownloadManager))
{
ppvObject = Marshal.GetComInterfaceForObject(manager, typeof(IDownloadManager));
return 0; //S_OK
}
ppvObject = IntPtr.Zero;
return unchecked((int)0x80004002); //NON_INTERFACE (use the default, please)
}
}
protected override WebBrowserSiteBase CreateWebBrowserSiteBase()
{
return new WebBrowserControlSite(this);
}
}
}
To use it, just instantiate the ExtendedBrowser.
Form1.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace BrowserExample
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
var browser = new ExtendedBrowser();
this.Controls.Add(browser);
browser.Dock = DockStyle.Fill;
browser.Navigate("http://stackoverflow.com");
}
}
}
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