Browser Helper Objects

  • Thread starter Thread starter JohnFol
  • Start date Start date
J

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(True), InterfaceType(ComInterfaceType.InterfaceIsIUnknown),
Guid("FC4801A3-2BA9-11CF-A229-00AA003D7352")> _

Public Interface IObjectWithSite

Sub SetSite(<MarshalAs(UnmanagedType.IUnknown)> ByVal pUnkSite As Object)

Sub GetSite(ByRef riid As Object, <MarshalAs(UnmanagedType.Interface)> 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?
 
<ComVisible(True), InterfaceType(ComInterfaceType.InterfaceIsIUnknown),
Guid("FC4801A3-2BA9-11CF-A229-00AA003D7352")> _

Public Interface IObjectWithSite

Sub SetSite(<MarshalAs(UnmanagedType.IUnknown)> ByVal pUnkSite As Object)

Sub GetSite(ByRef riid As Object, <MarshalAs(UnmanagedType.Interface)> ByVal
ppvSite As Object)

End Interface
Click to expand...

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?
Click to expand...

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, many thanks for the guidence.

Regards


Mattias Sjögren said:
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 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
Click to expand...
 
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