.NET object in C++

[amasidlover]

I'm trying to wrap a SOAP webservice in an OCX and one option is to write the webservice wrapper in C# and export it as a .NET/COM interoperabilit y object, as in http://support.microsoft.com/kb/908574

However, when I attempt this initially I got a could not import tlb error when compiling the C++, I fixed this by correcting the path on the import line and that error went away - so I'm pretty confident the tlb is now being properly imported. I now get lots of undefined errors for all of the symbols that should be created e.g. my equivalent of IHelloWorldPtr, ptrHW etc... I've tried inspecting the TLB using the COM/OLE Viewer, but this doesn't seem to contain any of the names I'd recognise.

There seems to be a gap in all of the tutorials I've found that doesn't explain how the class names and interface names I use get translated in to the Ptr style names that appear in the C++ examples - I'm sure its something so obvious that no-one sees the need to mention it.

There's another example at http://support.microsoft.com/kb/828736/ but again it seems to skip over how you find out what the ICalculatorPtr and pICalc should be called if you only have the C# source to refer to.

Apologies if this isn't quite the right forum - because it spans .NET, OLE, COM, C++ and C# I wasn't sure of the best place for it.

Help would be much appreciated!

Alex

[NewToOracle]

Need Info

I now get lots of undefined errors for all of the symbols that should be created e.g. my equivalent of IHelloWorldPtr, ptrHW etc... I've tried inspecting the TLB using the COM/OLE Viewer, but this doesn't seem to contain any of the names I'd recognise.

Could you please post the errors you are getting?

[amasidlover]

Hi,

I'll add the relevant code too as the errors are meaningless without...

The C++/COM import:

#include "stdafx.h"
#import "CSharpProxyRetail.tlb" raw_interfaces_only
#include <iostream>
#include <atlbase.h>

using namespace CSharpProxyRetail;
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
	HRESULT hr = CoInitialize(NULL);
	BSTR Val;
	
	IRetailPtr ptrHW (__uuidof(WrapRetail)); 
	ptrHW>getStockInformation();
	ptrHW>QuantityOnPO(&Val);

	CW2A szResponse(Val);
	cout << szResponse << endl;
	::SysFreeString(Val);
	CoUninitialize();
	return 0;
}

The c# (.NET) export of the interface:

public interface IRetail
{
    void getStockInformation();
    string QuantityOnPO();
   
}


[ComVisible(true)]    // By default, this value is true. However, this line of code is 
// included for documentation purposes.
public class WrapRetail : IRetail
{
    private Retail ws;
    private StockInfo si;

    public WrapRetail()
    {
        ws = new Retail();
    }
    public void getStockInformation()
    {
        si = ws.getStockInformation("37530119", 44);
    }

    public string QuantityOnPO()
    {
        return si.QuantityOnPO.ToString();
    }
}

The errors are:

\TestToo.cpp(14) : error C2065: 'IRetailPtr' : undeclared identifier
\TestToo.cpp(14) : error C2146: syntax error : missing ';' before identifier 'ptrHW'
\TestToo.cpp(14) : error C2065: 'ptrHW' : undeclared identifier
\TestToo.cpp(15) : error C2065: 'getStockInformation' : undeclared identifier
\TestToo.cpp(15) : warning C4552: '>' : operator has no effect; expected operator with side-effect
\TestToo.cpp(16) : error C2065: 'QuantityOnPO' : undeclared identifier
\TestToo.cpp(16) : warning C4552: '>' : operator has no effect; expected operator with side-effect
\TestToo.cpp(18) : error C2065: 'CW2A' : undeclared identifier
\TestToo.cpp(18) : error C2146: syntax error : missing ';' before identifier 'szResponse'
\TestToo.cpp(18) : error C2065: 'szResponse' : undeclared identifier

We've actually used gSOAP and done the whole thing in C++ as we were under some time pressure, but I'd be interested in the solution to this issue and it may help someone else...

Alex