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.NET Interace fails for no interface Messages   Related Types This message was discovered on microsoft.public.dotnet.framework.interop. Post a new message to this list... 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 Ad MBR BootFX Best-of-breed application framework for .NET projects, developed by Matthew Baxter-Reynolds and MBR IT

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