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WebResourceProvider

, 23 Mar 2007 CPOL
A framework to allow public web services to be used as objects in your application.
/////////////////////////////////////////////////////////////////////////////
// WebGrab.h : header file
//
// CWebGrab - CHttpFile wrapper class
//
// Written by Chris Maunder <cmaunder@mail.com>
// Copyright (c) 1998-2002. All Rights Reserved.
//
// This code may be used in compiled form in any way you desire. This
// file may be redistributed unmodified by any means PROVIDING it is 
// not sold for profit without the authors written consent, and 
// providing that this notice and the authors name and all copyright 
// notices remains intact. 
//
// An email letting me know how you are using it would be nice as well. 
//
// This file is provided "as is" with no expressed or implied warranty.
// The author accepts no liability for any damage/loss of business that
// this product may cause.
//
// History: 19 Nov 1999 - Release
//          26 Jan 2002 - Update by Bryce to include Proxy support and
//                        property accessors (transfer rate, error msg
//                        etc)
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_WEBGRAB_H__D31F39A4_1C63_11D3_AA11_AC48B5000000__INCLUDED_)
#define AFX_WEBGRAB_H__D31F39A4_1C63_11D3_AA11_AC48B5000000__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// WebGrab.h : header file
//

#include <afxinet.h>

/////////////////////////////////////////////////////////////////////////////
// CWebGrabSession 

class CWebGrabSession : public CInternetSession
{
// Construction
public:
	CWebGrabSession(LPCTSTR szAgentName);
	CWebGrabSession(LPCTSTR szAgentName, CWnd* pStatusWnd);
	virtual ~CWebGrabSession();
    void CommonConstruct();

// Operations
public:
    void SetStatus(LPCTSTR fmt, ...);
    void SetStatusWnd(CWnd* pWnd)     { m_pStatusWnd = pWnd; }

// Overrides
public:
	CString GetErrorMessage();
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CWebGrabSession)
	//}}AFX_VIRTUAL
    virtual void OnStatusCallback(DWORD dwContext, DWORD dwInternetStatus, 
                                  LPVOID lpvStatusInformation, 
                                  DWORD dwStatusInformationLength);

	// Generated message map functions
	//{{AFX_MSG(CWebGrabSession)
	//}}AFX_MSG

// Attributes
protected:
    CWnd* m_pStatusWnd;
	CString errorMessage;
};


/////////////////////////////////////////////////////////////////////////////
// CWebGrab 

class CWebGrab : public CObject
{
public:
	CWebGrab();
	virtual ~CWebGrab();

// Operations
public:
    BOOL Initialise(LPCTSTR szAgentName = NULL, CWnd* pWnd = NULL);
 

    BOOL GetFile(LPCTSTR szURL, CString& strBuffer, 
                 LPCTSTR szAgentName = NULL, CWnd* pWnd = NULL);

    BOOL GetFileInfo
      (LPCTSTR  szURL,
       CString& strLastModified,
       DWORD&   dwSize,
       DWORD&   dwServerError,
       LPCTSTR  szAgentName = NULL,
       CWnd*    pWnd = NULL);

	 void Close();
	// Overrides
public:
	CString GetRawHeaders();
	CString GetSocksHttp(LPCSTR url);
	CString GetErrorMessage();

	DWORD	GetPageStatusCode();
	SHORT   GetErrorCode();
	double  GetRate();

  bool GetForceReload() { return m_bForceReload; }
  void SetForceReload (bool bForceReload) { m_bForceReload = bForceReload; }

	void    SetUseProxy(bool use);
	void    SetProxy(LPCSTR proxy, WORD port,bool use=true);
	void    SetProxyPort(UINT port);
	void    SetProxyServer(LPCSTR server);
	void    SetTimeOut(DWORD timeOut);

	

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CWebGrab)
	//}}AFX_VIRTUAL

	// Generated message map functions
	//{{AFX_MSG(CWebGrab))
	//}}AFX_MSG

protected:
    CWebGrabSession* m_pSession;
	DWORD   m_timeOut;
  bool    m_bForceReload;

private:
	double  m_transferRate;
	bool    m_useProxy;
	UINT    m_Port;
	DWORD	m_infoStatusCode;

	CString m_ErrorMessage;
	CString m_Proxy;
	CString	m_rawHeaders;
};

/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_WEBGRAB_H__D31F39A4_1C63_11D3_AA11_AC48B5000000__INCLUDED_)

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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

Ravi Bhavnani
Technical Lead
Canada Canada
Ravi Bhavnani is an ardent fan of Microsoft technologies who loves building Windows apps, especially PIMs, system utilities, and things that go bump on the Internet. During his career, Ravi has developed expert systems, desktop imaging apps, marketing automation software, EDA tools, a platform to help people find, analyze and understand information, trading software for institutional investors and advanced data visualization solutions. He currently works for a company that provides enterprise workforce management solutions to large clients.

His interests include the .NET framework, reasoning systems, financial analysis and algorithmic trading, NLP, HCI and UI design. Ravi holds a BS in Physics and Math and an MS in Computer Science and was a Microsoft MVP (C++ and C# in 2006 and 2007). He is also the co-inventor of 2 patents on software security and generating data visualization dashboards. His claim to fame is that he crafted CodeProject's "joke" forum post icon.

Ravi's biggest fear is that one day he might actually get a life, although the chances of that happening seem extremely remote.
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