ATL COM server visual studios

Hi,

Im new to programming and am attempting to implement an ATL COM server following a software development kit. However, I am having all sorts of problems. Iv created an ATL project and added a simple object called CoSensorServer. Iv then implemented interfaces:

IPMSensorServer,
IPMSensorConfig,
IPMPositionGenerator
and IPMSensorRuntime

from a library included in the SDK.

My CoSensorServer cpp file looks like this:

/ CoSensorServer.cpp : Implementation of CCoSensorServer

#include "stdafx.h"
#include "CoSensorServer.h"


// CCoSensorServer

class ATL_NO_VTABLE CCoSensorServer :
public CComObjectRootEx<CComSingleThreadModel>,
public CComCoClass<CCoSensorServer, &CLSID_CoSensorServer>,
public ICoSensorServer,
public IPMPositionGenerator,
public IPMSensorConfig,
public IPMSensorRuntime,
public IPMSensorServer
{
public:
CCoSensorServer()
{
}

DECLARE_REGISTRY_RESOURCEID(IDR_COSENSORSERVER)

DECLARE_NOT_AGGREGATABLE(CCoSensorServer)

BEGIN_COM_MAP(CCoSensorServer)
COM_INTERFACE_ENTRY(ICoSensorServer)
COM_INTERFACE_ENTRY(IPMPositionGenerator)
COM_INTERFACE_ENTRY(IPMSensorConfig)
COM_INTERFACE_ENTRY(IPMSensorRuntime)
COM_INTERFACE_ENTRY(IPMSensorServer)
END_COM_MAP()


DECLARE_PROTECT_FINAL_CONSTRUCT()

HRESULT FinalConstruct()
{
return S_OK;
}

void FinalRelease()
{
}

public:


// IPMPositionGenerator Methods
public:
STDMETHOD(CreatePosGen)(GUID PosGenId, GUID SensorId, long * plType)
{
return E_NOTIMPL;
}
STDMETHOD(ConfigurePosGen)(GUID PosGenId, GUID SensorId, signed char * pbChanged)
{
return E_NOTIMPL;
}
STDMETHOD(RemovePosGen)(GUID PosGenId)
{
return E_NOTIMPL;
}
STDMETHOD(LoadPosGen)(GUID PosGenId, long lType, long lSize, unsigned char * pucBuffer, signed char * pbUpgraded)
{
return E_NOTIMPL;
}
STDMETHOD(SavePosGen)(GUID PosGenId, long * plSize, unsigned char * * ppucBuffer)
{
return E_NOTIMPL;
}

// IPMSensorConfig Methods
public:
STDMETHOD(InitServer)()
{
return E_NOTIMPL;
}
STDMETHOD(CreateSensor)(GUID SensorId)
{
return E_NOTIMPL;
}
STDMETHOD(ConfigureSensor)(GUID SensorId, signed char * pbChanged)
{
return E_NOTIMPL;
}
STDMETHOD(RemoveSensor)(GUID SensorId)
{
return E_NOTIMPL;
}
STDMETHOD(LoadSensor)(GUID SensorId, long lSize, unsigned char * pucBuffer, signed char * pbUpgraded)
{
return E_NOTIMPL;
}
STDMETHOD(SaveSensor)(GUID SensorId, long * plSize, unsigned char * * ppucBuffer)
{
return E_NOTIMPL;
}
STDMETHOD(ShowStatus)(GUID SensorId)
{
return E_NOTIMPL;
}

// IPMSensorRuntime Methods
public:
STDMETHOD(StartSensor)(GUID SensorId, long lGenerators, GUID * pPosGenerators, _IPMSensorResult * p_IPMSensorResult)
{
return E_NOTIMPL;
}
STDMETHOD(StopSensor)(GUID SensorId)
{
return E_NOTIMPL;
}
STDMETHOD(ShowRuntimeInfo)(GUID SensorId, signed char bShow)
{
return E_NOTIMPL;
}

// IPMSensorServer Methods
public:
STDMETHOD(GetName)(BSTR * bstrName)
{
return E_NOTIMPL;
}
STDMETHOD(GetDescription)(BSTR * bstrDescription)
{
return E_NOTIMPL;
}
STDMETHOD(GetVersion)(long * plMajor, long * plMinor)
{
return E_NOTIMPL;
}
};

OBJECT_ENTRY_AUTO(__uuidof(CoSensorServer), CCoSensorServer)





I am getting the following error when compiling:

c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\atlmfc\include\atlcom.h(1760): error C2259: 'ATL::CComObject<Base>' : cannot instantiate abstract class
with [ Base=CCoSensorServer ]




The output:

Rebuild All started: Project: MySensorServer, Configuration: Debug Win32 ------

Deleting intermediate files and output files for project 'MySensorServer', configuration 'Debug|Win32'.
Creating Type Library...
Processing .\MySensorServer.idl
MySensorServer.idl
Processing C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\oaidl.idl
oaidl.idl
Processing C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\objidl.idl
objidl.idl
Processing C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\unknwn.idl
unknwn.idl
Processing C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\wtypes.idl
wtypes.idl
Processing C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\basetsd.h
basetsd.h
Processing C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\guiddef.h
guiddef.h
Processing C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\ocidl.idl
ocidl.idl
Processing C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\oleidl.idl
oleidl.idl
Processing C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\servprov.idl
servprov.idl
Processing C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\urlmon.idl
urlmon.idl
Processing C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\msxml.idl
msxml.idl
Processing C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\oaidl.acf
oaidl.acf
Processing C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\include\ocidl.acf
ocidl.acf
Compiling...
stdafx.cpp
Compiling...
CoSensorServer.cpp
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\atlmfc\include\atlcom.h(1760) : error C2259: 'ATL::CComObject<Base>' : cannot instantiate abstract class
with
[
Base=CCoSensorServer
]
due to following members:
'HRESULT IPMPositionGenerator::ConfigurePosGen(GUID,GUID,char *)' : pure virtual function was not defined
c:\Documents and Settings\Andre Bedon\My Documents\Visual Studio Projects\MySensorServer\Debug\externalsensor.tlh(102) : see declaration of 'IPMPositionGenerator::ConfigurePosGen'
'HRESULT IPMPositionGenerator::LoadPosGen(GUID,long,long,unsigned char *,char *)' : pure virtual function was not defined
c:\Documents and Settings\Andre Bedon\My Documents\Visual Studio Projects\MySensorServer\Debug\externalsensor.tlh(108) : see declaration of 'IPMPositionGenerator::LoadPosGen'
'HRESULT IPMSensorConfig::ConfigureSensor(GUID,char *)' : pure virtual function was not defined
c:\Documents and Settings\Andre Bedon\My Documents\Visual Studio Projects\MySensorServer\Debug\externalsensor.tlh(73) : see declaration of 'IPMSensorConfig::ConfigureSensor'
'HRESULT IPMSensorConfig::LoadSensor(GUID,long,unsigned char *,char *)' : pure virtual function was not defined
c:\Documents and Settings\Andre Bedon\My Documents\Visual Studio Projects\MySensorServer\Debug\externalsensor.tlh(78) : see declaration of 'IPMSensorConfig::LoadSensor'
'HRESULT IPMSensorRuntime::ShowRuntimeInfo(GUID,char)' : pure virtual function was not defined
c:\Documents and Settings\Andre Bedon\My Documents\Visual Studio Projects\MySensorServer\Debug\externalsensor.tlh(184) : see declaration of 'IPMSensorRuntime::ShowRuntimeInfo'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\atlmfc\include\atlcom.h(1752) : while compiling class-template member function 'HRESULT ATL::CComCreator<T1>::CreateInstance(void *,const IID &,LPVOID * )'
with
[
T1=ATL::CComObject<CCoSensorServer>
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\atlmfc\include\atlcom.h(1832) : see reference to class template instantiation 'ATL::CComCreator<T1>' being compiled
with
[
T1=ATL::CComObject<CCoSensorServer>
]
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\atlmfc\include\atlcom.h(1828) : while compiling class-template member function 'HRESULT ATL::CComCreator2<T1,T2>::CreateInstance(void *,const IID &,LPVOID * )'
with
[
T1=ATL::CComCreator<ATL::CComObject<CCoSensorServer>>,
T2=ATL::CComFailCreator<-2147221232>
]
c:\Documents and Settings\Andre Bedon\My Documents\Visual Studio Projects\MySensorServer\CoSensorServer.cpp(135) : see reference to class template instantiation 'ATL::CComCreator2<T1,T2>' being compiled
with
[
T1=ATL::CComCreator<ATL::CComObject<CCoSensorServer>>,
T2=ATL::CComFailCreator<-2147221232>
]
MySensorServer.cpp
Generating Code...

Build log was saved at "file://c:\Documents and Settings\Andre Bedon\My Documents\Visual Studio Projects\MySensorServer\Debug\BuildLog.htm"
MySensorServer - 1 error(s), 0 warning(s)


------ Skipped Rebuild All: Project: MySensorServerPS, Configuration: Debug Win32 ------

Project configuration skipped because it is not selected in this solution configuration


---------------------- Done ----------------------

Rebuild All: 0 succeeded, 1 failed, 1 skipped


Any ideas how I can overcome this error? Iv spent too many hours to no avail. Thanks very much in advance.

Andre

The problem might be in the prototypes of the functions.
If you look at the errors generated by the compiler you will observe that only the functions that have signed char type as one of the parameters are not recognized by compiler. You defined that parameters as signed char, but compiler looks for just char. Thus it doesn't recognize the functions you implemented in the class. In C++ there are 3 distinct types: signed char, unsigned char and char. Some compilers treat char as signed (such as VS compiler) and the other ones as unsigned. Anyway they are distinct types.
So please check the actual prototypes of the functions in header files generated by MIDL compiler and not those that are in correspondent IDL file that describes the interfaces. By definition, MIDL char is unsigned while VS C++ char is signed, that is why /char switch is used in MIDL compiler.
Please look here for the description of /char switch.

Thanks so much,
Finally got it running, really appreciate it!!