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Bringing DCOM remoting functionality to Windows CE and .NET CF2.0

, 17 Apr 2006 CPOL
This article shows how to use DCOM on Windows CE 5.0. We will add full DCOM rich error information, and implement a DCOM interface between a Windows XP .NET 2.0 client and Windows CE DCOM server. With this code, it is possible to code .NET remoting alike functionality through DCOM interop.
////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2006 Werner Willemsens
//
////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include <comutil.h>
#include <comdef.h>
#include "Error.h"

extern HINSTANCE g_hInstance;

HRESULT ThrowCOMError(const CLSID &clsid, const IID &iid, ULONG nErrorCode)
{
	// Who am I?
	_bstr_t sComponent;
    LPOLESTR sProgId;
    ProgIDFromCLSID(clsid, &sProgId);
    if (sProgId != NULL)
    {
        sComponent = sProgId;
        CoTaskMemFree (sProgId);
    }

	// Load string from resource
	TCHAR sString[256];
	int nLength = LoadString (g_hInstance, nErrorCode, sString, sizeof(sString));
	_bstr_t sDescription (sString);

	// Create rich error information
	ICreateErrorInfoPtr iCreateErrorInfo;
	if (SUCCEEDED(CreateErrorInfo (&iCreateErrorInfo)))
	{
		iCreateErrorInfo->SetGUID (iid);
		iCreateErrorInfo->SetSource (sComponent);
		iCreateErrorInfo->SetDescription (sDescription);
		iCreateErrorInfo->SetHelpFile (_bstr_t(_T("No helpfile")));
		iCreateErrorInfo->SetHelpContext (0x1234);

		IErrorInfoPtr iErrorInfo (iCreateErrorInfo);
		// Store rich error in local thread context, where it will be picked up
		// by IChannelHook...
		SetErrorInfo (0, iErrorInfo);
	}

	// Make a valid COM error HRESULT
	HRESULT hr = MAKE_HRESULT(3, FACILITY_ITF, nErrorCode);

	return hr;
};

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Werner Willemsens
Team Leader
Belgium Belgium
No Biography provided

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