Any VB/COM experts here??

[SamSpade]

Applications can retrieve an ITextDocument pointer from a rich edit control.
To do this, send an EM_GETOLEINTERFACE message to retrieve an IRichEditOle
object. Then, call the object's QueryInterface method to retrieve an
ITextDocument pointer.

How to do that?? I tried:

Dim oREO As Object

Dim mIDocument As tom.ITextDocument

SendMessage(Handle, EM_GETOLEINTERFACE, 0, oREO)

mIDocument = CType(oREO, tom.ITextDocument)

But this produces a "Cast Not Valid" message

Anyone have any insight as to how to make VB call QueryInterface??



Thanks in advance

 

[Herfried K. Wagner [MVP]]

Anyone have any insight as to how to make VB call QueryInterface??

Untested in your situation:
'System.Runtime.InteropServices.Marshal.QueryInterface'.

 

[SamSpade]

I had read this but did not understand how to use it.

Thanks

 

[SamSpade]

Maybe I've got it

I had read this but did not understand how to use it.

Thanks