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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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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(""));

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.


// 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
        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
    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;
        : m_nScheme(INTERNET_SCHEME_DEFAULT)
        , m_nPort(0)
    CSplitURL(LPCTSTR lpsz)
        : m_nScheme(INTERNET_SCHEME_DEFAULT)
        , m_nPort(0)


    // 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
        // 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; }


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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 
Might I suggest writing a tokenizer iterator class for that, rather than using strok.

- Houdini
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 
Joke Pinsuss 16:21 

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