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WebResourceProvider

, 23 Mar 2007 CPOL
A framework to allow public web services to be used as objects in your application.
//  CodeProjectTopPostersProvider.cpp
//
//  An object that retrieves the top CodeProject forum posters.
//

#include "stdafx.h"
#include "CodeProjectTopPostersProvider.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

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

CodeProjectTopPostersProvider::CodeProjectTopPostersProvider
  (CStringArray&  topPosters,
   long           nTop)
  : CWebResourceProvider()
{
  m_pTopPosters = &topPosters;
  m_pTopPosters->RemoveAll();
  m_nTop = nTop;
  m_nPage = 1;

  // Don't allow user to get more than top 100 posters
  if (m_nTop > 100) {
      m_nTop = 100;
  }
}

CodeProjectTopPostersProvider::~CodeProjectTopPostersProvider()
{
}

/////////////////////////////////////////////////////////////////////////////
// Overridden methods

void CodeProjectTopPostersProvider::constructUrl
  (CString& strUrl)
{
  // Construct the CodeProject URL to be retrieved
  strUrl.Format ("http://www.codeproject.com/script/profile/whos_who.asp?VT=mess&PN=%d", m_nPage);
}

bool CodeProjectTopPostersProvider::moreAvailable()
{
  if ((m_nPage * 10) < m_nTop) {
    ::Sleep (500);  // insert delay so we don't overload www.codeproject.com
    m_nPage++;
    return (true);
  }
  return (false);
}

void CodeProjectTopPostersProvider::parseContent()
{
  // Reset the object
  m_dwFetchStatus = 1;
  m_strFetchError = "Error parsing content";

  // Get posters on this page
  do {
    // Get poster's name
    CString strName;
    if (!skipTo ("<h4>"))
       break;
    if (!skipTo (". "))
       break;
    if (!extractTo ("</h4>", strName))
       break;
    trim (strName);
    removeHtml (strName);

    // Get post count
    CString strCount;
    if (!skipTo ("(while logged in)"))
       break;
    if (!skipTo ("class=smalltext>"))
       break;
    if (!extractTo ("</td>", strCount))
       break;

    // Add poster to list
    CString strPoster;
    strPoster.Format ("[%s]      %s", strCount, strName);
    ASSERT (m_pTopPosters != NULL);
    m_pTopPosters->Add (strPoster);
  }
  while (m_pTopPosters->GetSize() < m_nTop);

  // Return successfully
  m_dwFetchStatus = 0;
  m_strFetchError.Empty();
}

// End CodeProjectTopPostersProvider.cpp

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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

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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