checknewversion.cpp

c++系统开发实例精粹内附的80例源代码 环境:windows2000,c++6.0

//////////////////////////////////////////////////////////////////////
// FileFury
// Copyright (c) 2000 Tenebril Incorporated
// All rights reserved.
//
// This source code is governed by the Tenebril open source
// license (http://www.tenebril.com/developers/opensource/license.html)
//
// For more information on this and other open source applications,
// visit the Tenebril OpenSource page:
//       http://www.tenebril.com/developers/opensource
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include <afxinet.h>
#include "CheckNewVersion.h"

CCheckNewVersion::CCheckNewVersion(CWnd *parent, LPCTSTR versionfile,
								   int currentversion, LPCTSTR url)
{
	VersionFile = versionfile;
	CurrentVersion = currentversion;
	URL = url;
	ParentWnd = parent;
}

CCheckNewVersion::~CCheckNewVersion()
{
}

void CCheckNewVersion::Run()
{
	int Newest = WebVersion();

	if(Newest > CurrentVersion)
	{
		CCheckNewVersionDlg CheckDlg(ParentWnd, URL);
		CheckDlg.DoModal();
	}
	else
		ParentWnd->MessageBox("You have the latest version of the software.",
			"New version", MB_ICONEXCLAMATION | MB_OK);

	return;
}

int CCheckNewVersion::WebVersion()
{
	AFX_MANAGE_STATE(AfxGetStaticModuleState());
	CHttpFile *HttpFile;
    char FileData[2050];
	DWORD StatusCode;
	int numread;
	CInternetSession InetSession("CheckNewVersion 1.0");

	try
	{
		HttpFile = (CHttpFile *)InetSession.OpenURL(VersionFile, 1,
			INTERNET_FLAG_TRANSFER_ASCII | INTERNET_FLAG_RELOAD);
		if(!HttpFile)
			return -1;

		if(!HttpFile->QueryInfoStatusCode(StatusCode))
		{
			delete HttpFile;
			return -1;
		}

		if(StatusCode > 299)
		{
			delete HttpFile;
			return -1;
		}
	}
	catch(CInternetException *pInetExcept)
	{
		pInetExcept->m_dwError;
		delete HttpFile;
		return -1;
	}
	
	memset((void *)FileData, 0, sizeof(char) * 2050);
	numread = HttpFile->Read(FileData, 2048);
	FileData[numread] = '\0';

	HttpFile->Close();
	delete HttpFile;

	return atoi(FileData);
}