Browser Helper Objects

[JohnFol]

I am trying to make use of BHO's (and no not to write spyware). It seems all
articles relate to C++, whereas my background si in VB.Net
I've managed to understand that I need the following i/face defined

<ComVisible(Tru e), InterfaceType(C omInterfaceType .InterfaceIsIUn known),
Guid("FC4801A3-2BA9-11CF-A229-00AA003D7352")> _

Public Interface IObjectWithSite

Sub SetSite(<Marsha lAs(UnmanagedTy pe.IUnknown)> ByVal pUnkSite As Object)

Sub GetSite(ByRef riid As Object, <MarshalAs(Unma nagedType.Inter face)> ByVal
ppvSite As Object)

End Interface

But

I have also added the registry entry using the GUID from the assembly.vb
file, but what escapes me is how to have the browser invoke the code so I
can step through / interrogate the value?

Does anyone have a real step by step guid to getting the basics to work
using VB.net?

[Mattias Sjögren]

<ComVisible(Tr ue), InterfaceType(C omInterfaceType .InterfaceIsIUn known),
Guid("FC4801 A3-2BA9-11CF-A229-00AA003D7352")> _

Public Interface IObjectWithSite

Sub SetSite(<Marsha lAs(UnmanagedTy pe.IUnknown)> ByVal pUnkSite As Object)

Sub GetSite(ByRef riid As Object, <MarshalAs(Unma nagedType.Inter face)> ByVal
ppvSite As Object)

End Interface
You don't need to mark the interface as ComVisible, but you should use
the ComImport attribute.

The first parameter of GetSite should be a Guid, not an Object. The
second parameter should be passed ByRef.

I have also added the registry entry using the GUID from the assembly.vb
file, but what escapes me is how to have the browser invoke the code so I
can step through / interrogate the value?

I believe the object should be created and called whenever you open a
browser window. But of course, that only works if your interface
declaration is correct.

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

[JohnFol]

Mattias, many thanks for the guidence.

Regards
"Mattias Sjögren" <ma************ ********@mvps.o rg> wrote in message
news:uf******** *****@TK2MSFTNG P14.phx.gbl...

<ComVisible(Tr ue), InterfaceType(C omInterfaceType .InterfaceIsIUn known),
Guid("FC4801 A3-2BA9-11CF-A229-00AA003D7352")> _

Public Interface IObjectWithSite

Sub SetSite(<Marsha lAs(UnmanagedTy pe.IUnknown)> ByVal pUnkSite As Object)

Sub GetSite(ByRef riid As Object, <MarshalAs(Unma nagedType.Inter face)> ByValppvSite As Object)

End Interface

You don't need to mark the interface as ComVisible, but you should use
the ComImport attribute.

The first parameter of GetSite should be a Guid, not an Object. The
second parameter should be passed ByRef.

I have also added the registry entry using the GUID from the assembly.vb
file, but what escapes me is how to have the browser invoke the code so I
can step through / interrogate the value?

I believe the object should be created and called whenever you open a
browser window. But of course, that only works if your interface
declaration is correct.

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.