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

Mike Carr

I am trying to implement an existing C++ Sink Interface (????).
In the C# initializeTestApp, if I try to cast to WRAPPERLib.IWrapper it
throw and exception. Currently the object that comes across is a
{System.__ComObject} how can I get this to be a pointer to
WRAPPERLib.IWrapper in C#?

Here is the C++ Code:

IUnknownPtr pUnknown;
hr = m_xWrapper.QueryInterface (IID_IUnknown, (void**) &pUnknown); //first
time only

iError = pTestExec->initializeTestApp(pUnknown, //ptr to Wrapper
_bstr_t(szTestAppConfigFilename), //config/resource file
_bstr_t(""), //no config/resource file checksum
comPort);

pTestExec implementation:
WRAPPERLib::IWrapper m_pWrapper ;

STDMETHODIMP CTestExec::initializeTestApp(/*[in]*/ IUnknown *wrapper,
/*[in]*/ BSTR resFile, /*[in]*/ BSTR checkSum, /*[in]*/ BSTR comPort,
/*[out, retval]*/ int *pVal)
{
IUnknownPtr pUnknown;

//==========================================================================
// Save the pointer to the Wrapper

//==========================================================================
try {
m_pWrapper = wrapper;
}
.....

C# Server so far:
[
ComImport,
InterfaceType(ComInterfaceType.InterfaceIsIUnknown),
Guid("D9D79824-7FF6-11D3-ABC0-0008C7D32DD0")
]
public interface ITestExec
{
int initializeTestApp([MarshalAs(UnmanagedType.IUnknown)]object
wrapper,string resFile, string chksum, string comPort);
.....

}

[Guid("2217BB8C-7352-474c-93B7-B0AE8923AA9F"),
ClassInterface(ClassInterfaceType.AutoDual),
ComSourceInterfaces(typeof(ITestExec),typeof(WRAPPERLib.IWrapper)),
ProgId("MyTestExec.TestExec")]
public class TestExec : ITestExec
{
public int initializeTestApp(object wrapper, string resFile, string chksum,
string comPort)
{
int val =6;
return 0;
}

.....
}

Thanks in advance for your replies..
--
MICHAEL CARR

Reply to this message...

Mike Carr

m_xWrapper implements:

AddRef()
Release()
QueryInterface (REFIID riid, void** ppv)

plus the actual sink functions:
STDMETHODIMP CCOMTestAdapterApp::XWrapper::raw_sendTestMsg(int transId, BSTR
message)
STDMETHODIMP CCOMTestAdapterApp::XWrapper::raw_sendTestData( int transId,
BSTR functionName,
int loopCntr,
BSTR value,
BSTR upper,
BSTR lower,
BSTR unit,
BSTR dataType,
BSTR failureDescription,
int significantTestData,
BSTR passFailCode
)
.....

--
MICHAEL CARR

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Mike Carr

I got it, I had to add my interop assembly into the gac.

--
MICHAEL CARR

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	System.Runtime.InteropServices.ClassInterfaceType
	System.Runtime.InteropServices.ComInterfaceType
	System.Runtime.InteropServices.UnmanagedType

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