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Posted 28 Apr 2002


, 23 Mar 2007
A framework to allow public web services to be used as objects in your application.
//  ZipCodeDecoder.cpp
//  An object that retrieves a list of locations served by a US ZIP code.

#include "stdafx.h"
#include "ZipCodeDecoder.h"

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

// Construction/Destruction

  (CString        strZipCode,
   CStringArray&  locations)
  : CWebResourceProvider()
  m_strZipCode = strZipCode;
  m_pLocations = &locations;


// Overridden methods

void ZipCodeDecoder::constructUrl
  (CString& strUrl)
  // Construct the URL that points to the USPS zip code decoder form
  strUrl.Format ("");

void ZipCodeDecoder::getPostData
  (CString& strPostData)
  strPostData.Format ("zip5=%s", m_strZipCode);

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

  // Skip to start of content
  CString strStartContent = "<td valign=\"top\" class=\"main\" ";
  strStartContent += "style=\"background:url(images/table_gray.gif); ";
  strStartContent += "padding:5px 10px;\" headers=\"pre\"><b>";
  if (!skipTo (strStartContent))

  // Extract city name
  CString strLocation;
  if (!extractTo ("</b></td>", strLocation))

  // Add it to location list
  int nLocations = 0;
  ASSERT (m_pLocations != NULL);
  m_pLocations->Add (strLocation);

  // TODO (Ravi B, 23-Mar-2007):
  // Earlier content from USPS contained a list of cities, hence the use
  // of m_pLocations.  Replace this with a single CString after verifying
  // the content will always contain a single location (at most).

  // Return
  if (nLocations == 0)
  m_dwFetchStatus = 0;

// End ZipCodeDecoder.cpp

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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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