MBR IT/.NET 247 : Am I using the correct signature? on microsoft.public.dotnet.framework.interop

Am I using the correct signature?

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This message was discovered on microsoft.public.dotnet.framework.interop.

Shahid

Greetings,

I am having trouble passing a pointer of type
IVSMDCodeDomProvider from Visual C++ (ATL) to managed
code in Vb.net.

The following is the Visual C++ code:
***
CComPtr<IVSMDCodeDomProvider> pCD;
// ... The above pointer is made to point to an existing
file

long TempLong;
TempLong = (long)(pCD.p);
hr = Managed_Method(&TempLong);
***

The following is the Vb.net code:
***
Public Function Managed_Method(<InAttribute(),
OutAttribute(), MarshalAs(UnmanagedType.Interface)> ByRef
pCodeDomProvider As IntPtr) As String Implements
ISomeInterface.Managed_Method

Dim pCDInterface As IVSMDCodeDomProvider
pCDProvider = Marshal.GetTypedObjectForIUnknown(
pCodeDomProvider, System.Type.GetType
("Microsoft.VisualStudio.Designer.Interfaces.IVSMDCodeDomP
rovider")
Dim pCDProvider As System.CodeDom.Compiler.CodeDomProvider
pCDProvider = pCDInterface.pCodeDomProvider
// ... The problem is that this pCDProvider is Nothing ...

End Function

***

Regards,

Shahid.

Reply to this message...

Mattias Sjögren

Shahid,

Why are you making things so complicated? Have you tried to simply
make it

Public Function Managed_Method(ByVal pCodeDomProvider As
IVSMDCodeDomProvider) As String Implements
ISomeInterface.Managed_Method

Mattias

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

Reply to this message...

Shahid

Hello Mattias,

I also tried this approach but the object received in the
managed code is still null (Nothing in Vb.net).

By the way, after making the signature on the Managed
side to the one you've mentioned, the signature on the
Visual C++ side became as:

"
BSTR Managed_Method([in] IUnknown *pCodeDomProvider);
"

I don't know why this is not working so any help would be
deeply appreciated.

Regards,

Shahid.

[Original message clipped]

Reply to this message...

	System.CodeDom.Compiler.CodeDomProvider
	System.IntPtr
	System.Runtime.InteropServices.InAttribute
	System.Runtime.InteropServices.Marshal
	System.Runtime.InteropServices.OutAttribute
	System.Runtime.InteropServices.UnmanagedType
	System.Type

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