ExamGuru IT/.Net Guru : .NET Interace fails for no interface on microsoft.public.dotnet.framework.interop

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.NET Interace fails for no interface

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

Mike Carr

I have a c# component that I have created that has a single interface. I would like to be able to use in from a Visual C++ 6.0 program.

C# component
public class TestExec : ITestExec{

public TestExec()

{

}

#region ITestExec Members

public int initializeTestApp(object wrapper, string resFile, string chksum, string comPort)

{

// TODO: Add TestExec.initializeTestApp implementation

return 0;

}

[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]

public interface ITestExec

{

int initializeTestApp(object wrapper,string resFile, string chksum, string comPort);

}

#endregion

C++ Code

::ITestExecPtr m_pTestExec;

m_pTestExec.CreateInstance("TestExec");

CLSIDFromProgID(clsidString, &clsid) returns CLSID_TestExec

hr = CoCreateInstance(rclsid, pOuter, dwClsContext, __uuidof(IUnknown), reinterpret_cast<void**>(&pIUnknown)); //returns 0

hr = pIUnknown->QueryInterface(GetIID(), reinterpret_cast<void**>(&m_pInterface)); fails for -2147467262
GetIID() returns _com_IIID<ITestExec,&_GUID_d9d79824_7ff6_11d3_abc0_0008c7d32dd0>::GetIID returned {IID_ITestExec}

Can anyone help me out?

--
MICHAEL CARR

Reply to this message...

Mike Carr

I am trying to implement existing interfaces

--
MICHAEL CARR

"Mike Carr" <Click here to reveal e-mail address> wrote in message news:%23k%Click here to reveal e-mail address...
I have a c# component that I have created that has a single interface. I would like to be able to use in from a Visual C++ 6.0 program.

C# component
public class TestExec : ITestExec{

public TestExec()

{

}

#region ITestExec Members

public int initializeTestApp(object wrapper, string resFile, string chksum, string comPort)

{

// TODO: Add TestExec.initializeTestApp implementation

return 0;

}

[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]

public interface ITestExec

{

int initializeTestApp(object wrapper,string resFile, string chksum, string comPort);

}

#endregion

C++ Code

::ITestExecPtr m_pTestExec;

m_pTestExec.CreateInstance("TestExec");

CLSIDFromProgID(clsidString, &clsid) returns CLSID_TestExec

hr = CoCreateInstance(rclsid, pOuter, dwClsContext, __uuidof(IUnknown), reinterpret_cast<void**>(&pIUnknown)); //returns 0

hr = pIUnknown->QueryInterface(GetIID(), reinterpret_cast<void**>(&m_pInterface)); fails for -2147467262
GetIID() returns _com_IIID<ITestExec,&_GUID_d9d79824_7ff6_11d3_abc0_0008c7d32dd0>::GetIID returned {IID_ITestExec}

Can anyone help me out?

--
MICHAEL CARR

Reply to this message...

Mike Carr

I got it to work finally by adding
ComSourceInterfaces(typeof(ITestExec))]
to my class.

I have one other problem, I keep getting "Run-Time Check Failure #0 - The
value of ESP was not properly saved across a function call. This is usually
a result of calling a function declared with one calling convention with a
function pointer declared with a different calling convention."

The call should look like this:
HRESULT _stdcall pingPhone([out, retval] int* pVal);

but it looks like this:
HRESULT _stdcall pingPhone([out, retval] long* pRetVal);

How can I get the out,retcal = int*, I have been playing with the MarshalAs
with no luck

--
MICHAEL CARR

"Mike Carr" <Click here to reveal e-mail address> wrote in message
news:%Click here to reveal e-mail address...
I am trying to implement existing interfaces

--
MICHAEL CARR

"Mike Carr" <Click here to reveal e-mail address> wrote in message
news:%23k%Click here to reveal e-mail address...
I have a c# component that I have created that has a single interface. I
would like to be able to use in from a Visual C++ 6.0 program.

C# component
public class TestExec : ITestExec{
public TestExec()
{
}
#region ITestExec Members
public int initializeTestApp(object wrapper, string resFile, string chksum,
string comPort)
{
// TODO: Add TestExec.initializeTestApp implementation
return 0;
}
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface ITestExec
{
int initializeTestApp(object wrapper,string resFile, string chksum, string
comPort);
}
#endregion

C++ Code

::ITestExecPtr m_pTestExec;

m_pTestExec.CreateInstance("TestExec");

CLSIDFromProgID(clsidString, &clsid) returns CLSID_TestExec

hr = CoCreateInstance(rclsid, pOuter, dwClsContext, __uuidof(IUnknown),
reinterpret_cast<void**>(&pIUnknown)); //returns 0

hr = pIUnknown->QueryInterface(GetIID(),
reinterpret_cast<void**>(&m_pInterface)); fails for -2147467262
GetIID() returns
_com_IIID<ITestExec,&_GUID_d9d79824_7ff6_11d3_abc0_0008c7d32dd0>::GetIID
returned {IID_ITestExec}

Can anyone help me out?

--
MICHAEL CARR

Reply to this message...

System.Runtime.InteropServices.ComInterfaceType

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