adofiltr.cpp

windows ce开发技巧与实例光盘代码

/////////////////////////////////////////////////////////////////////////////
//
// AdoFiltr.cpp : Wrapper functions for the DESKTOPTODEVICE and
// DEVICETODESKTOP functions exported by ADOFILTR.DLL.
//
// Original code from:
// Copyright (c) 2000-2001 Nathan Lewis
// [e-mail]
// http://www.ticz.com/~nlewis
//
// Modified by Olivier G. Gaumond (2002)
// [e-mail]
//
// I encapsulated the functions in a C++ class
//
//
// This program is free software; you can redistribute it and/or modify it
// so long as credit is given to the original author listed above.
// 
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE.
//
/////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "AdoFiltr.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CAdoFiltr* CAdoFiltr::s_pSelf = NULL;

CAdoFiltr::CAdoFiltr()
{
	m_hLib = LoadAdoFiltrDll();

	if (!m_hLib)
		m_hrLoadErr = HRESULT_FROM_WIN32(GetLastError());

}

CAdoFiltr::~CAdoFiltr()
{
	// Unload the DLL
	if (m_hLib)
		FreeLibrary(m_hLib);
}

CAdoFiltr* CAdoFiltr::getInstance()
{
	if (CAdoFiltr::s_pSelf == NULL)
		s_pSelf = new CAdoFiltr();

	return s_pSelf;
}

//////////////////////////////////////////////////////////////////////
// Methods
//////////////////////////////////////////////////////////////////////

HRESULT CAdoFiltr::DesktopToDevice(LPCTSTR pszDesktopLocn,
						LPCTSTR pszTableList,
						BOOL bSync/* = FALSE*/,
						BOOL bOverwrite/* = TRUE*/,
						LPCTSTR pszDeviceLocn/* = NULL*/)
{
	return CallAdoFiltrFunc("DESKTOPTODEVICE", pszDesktopLocn, pszTableList,
		bSync, bOverwrite, pszDeviceLocn);
}


HRESULT CAdoFiltr::DeviceToDesktop(LPCTSTR pszDesktopLocn,
						LPCTSTR pszTableList,
						BOOL bSync/* = FALSE*/,
						BOOL bOverwrite/* = TRUE*/,
						LPCTSTR pszDeviceLocn/* = NULL*/)
{
	return CallAdoFiltrFunc("DEVICETODESKTOP", pszDesktopLocn, pszTableList,
		bSync, bOverwrite, pszDeviceLocn);
}


HMODULE CAdoFiltr::LoadAdoFiltrDll()
{
	HKEY hKey=NULL;
	HMODULE hLib=NULL;
	TCHAR szPath[MAX_PATH]={0};
	LONG lPath=sizeof(szPath);

	// Get path where CE Services / ActiveSync was installed from registry
	if(ERROR_SUCCESS==RegOpenKeyEx(HKEY_LOCAL_MACHINE,
		_T("Software\\Microsoft\\Windows\\CurrentVersion\\App Paths\\CEAPPMGR.EXE"),
		0, KEY_READ, &hKey))
	{
		if(ERROR_SUCCESS==RegQueryValue(hKey, NULL, szPath, &lPath))
		{
			// Replace the filename (CEAPPMGR.EXE) with DLL filename
			LPTSTR pFile=_tcsrchr(szPath, L'\\');

			if(pFile)
			{
				lstrcpy(_tcsinc(pFile), _T("adofiltr.dll"));

				// Now load the DLL
				hLib=LoadLibrary(szPath);
			}
		}

		RegCloseKey(hKey);
	}

	return hLib;
}


HRESULT CAdoFiltr::CallAdoFiltrFunc(LPCSTR pszFuncName, LPCTSTR pszDesktopLocn,
						 LPCTSTR pszTableList, BOOL bSync, BOOL bOverwrite,
						 LPCTSTR pszDeviceLocn)
{
	// Start by loading the DLL
	HRESULT hResult=NO_ERROR;

	if(m_hLib != NULL)
	{
		// Get the address of the specified function within the DLL
		typedef HRESULT (WINAPI* pfnDTD)(LPCTSTR,LPCTSTR,BOOL,int,LPCTSTR);

		pfnDTD pfn=(pfnDTD)GetProcAddress(m_hLib, pszFuncName);

		if(NULL==pfn)
			hResult=HRESULT_FROM_WIN32(GetLastError());
		else
		{
			// Call the function
			hResult=pfn(pszDesktopLocn, pszTableList, bSync, bOverwrite,
				pszDeviceLocn);
		}

	}
	else
	{
		hResult = m_hrLoadErr;
	}

	return hResult;
}