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CSplitURL - split a URL into component parts

, 10 Nov 2002
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Wrapper class for the WinInet InternetCrackUrl function
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Sample Image - SplitURL.jpg

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Introduction

Recently I needed some code that would split a URL into component parts (scheme, host, folder, etc.) and I came across a WinInet function called InternetCrackUrl which does the job. The function itself is fairly straighforward, but I thought the demo supplied on the MSDN might be a tad confusing for new users - so I have created CSplitURL to wrap the call.

This class is not going to win any prizes, but it is very easy to use - first include the header:

#include "url.h"

Then, to use the class, simply declare a CSplitURL object, passing the URL to split, e.g.:

CSplitURL url(_T("http://www.codeproject.com"));

Once you have created a CSplitURL, you can access the various URL components using the following methods:

  • GetScheme
  • GetPort
  • GetSchemeName
  • GetHostName
  • GetUserName
  • GetPassword
  • GetURLPath
  • GetExtraInfo

All pretty self-explanatory. Note that using this class in your application will create a dependency on WININET.DLL, which hopefully won't be a problem. Note also that this class can be used with any framework that includes a CString class - including MFC, WTL and ATL7.

CSplitURL

// Implementation of the CURLComponents and CSplitURL classes.

#pragma once
#pragma comment(lib, "wininet.lib")

#include "wininet.h"

// Class to wrap the Win32 URL_COMPONENTS structure
class CURLComponents : public URL_COMPONENTS
{
public:    
    CURLComponents(void)
    {
        memset(this, 0, sizeof(URL_COMPONENTS));
        dwStructSize = sizeof(URL_COMPONENTS);
    }
};

// Class used to split a URL into component parts.
// Note: Uses WININET InternetCrackUrl function.
class CSplitURL
{
private:
    CString m_strScheme;
    INTERNET_SCHEME m_nScheme;
    CString m_strHostName;
    INTERNET_PORT m_nPort;
    CString m_strUserName;
    CString m_strPassword;
    CString m_strURLPath;
    CString m_strExtraInfo;
public:    
    CSplitURL(void)
        : m_nScheme(INTERNET_SCHEME_DEFAULT)
        , m_nPort(0)
    {
    }
    
    CSplitURL(LPCTSTR lpsz)
        : m_nScheme(INTERNET_SCHEME_DEFAULT)
        , m_nPort(0)
    {
        Split(lpsz);
    }

    ~CSplitURL(void)
    {
    }

    // Split a URL into component parts
    bool Split(LPCTSTR lpsz)
    {
        // Be defensive
        ATLASSERT(lpsz != NULL && *lpsz != '\0');
        // Get the URL length
        DWORD dwLength = _tcslen(lpsz);

        CURLComponents url;        
        // Fill structure
        url.lpszScheme = m_strScheme.GetBuffer(dwLength);
        url.dwSchemeLength = dwLength;
        url.lpszHostName = m_strHostName.GetBuffer(dwLength);
        url.dwHostNameLength = dwLength;
        url.lpszUserName = m_strUserName.GetBuffer(dwLength);
        url.dwUserNameLength = dwLength;
        url.lpszPassword = m_strPassword.GetBuffer(dwLength);
        url.dwPasswordLength = dwLength;
        url.lpszUrlPath = m_strURLPath.GetBuffer(dwLength);
        url.dwUrlPathLength = dwLength;
        url.lpszExtraInfo = m_strExtraInfo.GetBuffer(dwLength);
        url.dwExtraInfoLength = dwLength;
        // Split
        bool bRet = InternetCrackUrl(lpsz, 0, 0, &url) != FALSE;
        // Release buffers
        m_strScheme.ReleaseBuffer();
        m_strHostName.ReleaseBuffer();
        m_strUserName.ReleaseBuffer();
        m_strPassword.ReleaseBuffer();
        m_strURLPath.ReleaseBuffer();
        m_strExtraInfo.ReleaseBuffer();
        // Get the scheme/port
        m_nScheme = url.nScheme;
        m_nPort = url.nPort;
        // Done
        return bRet;
    }

    // Get the scheme number
    inline INTERNET_SCHEME GetScheme(void) const { return m_nScheme; }
    // Get the port number
    inline INTERNET_PORT GetPort(void) const { return m_nPort; }
    // Get the scheme name
    inline LPCTSTR GetSchemeName(void) const { return m_strScheme; }
    // Get the host name
    inline LPCTSTR GetHostName(void) const { return m_strHostName; }
    // Get the user name
    inline LPCTSTR GetUserName(void) const { return m_strUserName; }
    // Get the password
    inline LPCTSTR GetPassword(void) const { return m_strPassword; }
    // Get the URL path
    inline LPCTSTR GetURLPath(void) const { return m_strURLPath; }
    // Get the extra info
    inline LPCTSTR GetExtraInfo(void) const { return m_strExtraInfo; }
};

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

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Comments and Discussions

 
GeneralGreat class Pinmemberlekrot10-Aug-06 14:57 
GeneralRe: Great class PinmemberRobert Edward Caldecott10-Aug-06 23:32 
GeneralGreat Article PinmemberThatsAlok22-Sep-04 20:55 
GeneralRe: Great Article PinmemberRobert Edward Caldecott22-Sep-04 21:38 
GeneralCUrl in ATL 7.0 atlutil.h PinmemberNorm Almond12-Nov-02 10:52 
GeneralRe: CUrl in ATL 7.0 atlutil.h PinmemberRobert Edward Caldecott12-Nov-02 22:56 
GeneralRe: CUrl in ATL 7.0 atlutil.h PinmemberBjornar Henden30-Nov-02 7:03 
GeneralExtra feature request PinmemberChris Hambleton12-Nov-02 7:27 
GeneralRe: Extra feature request PinmemberRobert Edward Caldecott12-Nov-02 7:38 
GeneralRe: Extra feature request PinmemberHoudini13-Nov-02 6:50 
GeneralAmazing PinmemberAdrian Edmonds11-Nov-02 19:37 
GeneralRe: Amazing PinsussAnonymous11-Nov-02 19:44 
GeneralRe: Amazing PinmemberAdrian Edmonds11-Nov-02 20:36 
GeneralRe: Amazing PinsussAnonymous11-Nov-02 21:16 
GeneralRe: Amazing PinmemberRobert Edward Caldecott11-Nov-02 23:01 
GeneralGreat PinsussSRK11-Nov-02 16:33 
GeneralCool PinsitebuilderUwe Keim11-Nov-02 7:13 
GeneralRe: Cool PinmemberRobert Edward Caldecott11-Nov-02 7:16 
QuestionAfxParseUrl? Pinmembertwask11-Nov-02 4:54 
AnswerRe: AfxParseUrl? PinmemberRobert Edward Caldecott11-Nov-02 5:04 
GeneralRe: AfxParseUrl? Pinmembertwask11-Nov-02 5:05 
Jokehttp://camp.tangoing.info/ Pinsusshttp://camp.tangoing.info/4-Dec-07 16:21 

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