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Simple HTTP Client using WININET

, 2 Sep 2003
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Simple HTTP Client, HTTP GET, HTTP POST, HTTP POST-MultiPartFormData


This class is used for HTTP REQUEST. It supports HTTP GET, HTTP POST and HTTP POST-MultiPartFormData.

Class Overview

class GenericHTTPClient {
    virtual ~GenericHTTPClient();

    // Connection handler    
    BOOL Connect(    LPCTSTR szAddress,
            LPCTSTR szAgent = __DEFAULT_AGENT_NAME,
            unsigned short nPort = INTERNET_DEFAULT_HTTP_PORT,
            LPCTSTR szUserAccount = NULL,
            LPCTSTR szPassword = NULL);

    BOOL Close();
    VOID InitilizePostArguments();

    // HTTP Arguments handler    
    VOID AddPostArguments(LPCTSTR szName, DWORD nValue);
    VOID AddPostArguments(LPCTSTR szName, LPCTSTR szValue, 
      BOOL bBinary = FALSE);

    // HTTP Method handler 
    BOOL Request(    LPCTSTR szURL,
            int nMethod = GenericHTTPClient::RequestGetMethod,
            LPCTSTR szAgent = __DEFAULT_AGENT_NAME);

    BOOL RequestOfURI(LPCTSTR szURI, int nMethod = 
    BOOL Response(PBYTE pHeaderBuffer, DWORD dwHeaderBufferLength, 
           PBYTE pBuffer, DWORD dwBufferLength, DWORD &dwResultSize);    
    LPCTSTR QueryHTTPResponse();
    LPCTSTR QueryHTTPResponseHeader();    

    // General Handler
    DWORD GetLastError();
    LPCTSTR GetContentType(LPCTSTR szName);
    VOID ParseURL(LPCTSTR szURL, LPTSTR szProtocol, LPTSTR szAddress, 
          DWORD &dwPort, LPTSTR szURI);
  • Connect(...) method connects to HTTP Server.
  • Close() method closes connection. These are used with RequestOfURI(...).
  • InitilizePostArguments() method initializes post arguments.
  • AddPostArguments(...) method is supported so that you can add new post arguments of the following 3 types ( TCHAR, DWORD, FILE).
  • Request(...) method is for you to attempt request for HTTP REQUEST( GET, POST, POST-MULTIPARTFORMDATA) with URL. HTTP METHOD indirector have 3 types.
    • GenericHTTPClient::GetMethod is HTTP GET REQUEST
    • GenericHTTPClient::PostMethod is HTTP POST REQUEST
    • GenericHTTPClient::PostMultiPartsFormData is HTTP POST REQUEST with BINARY FORM DATA
  • RequestOfURI(...) method is that you could have attempt request for HTTP REQUEST with URI. This method is used with Connect(...) and Close().
  • Response(...) method is that you have HTTP Response by BYTES.
  • QueryHTTPResponse() method is you have receive HTML of your HTTP REQUEST.
  • QueryHTTPResponseHeader() method is you have receive HTTP HEADER about QueryHTTPResponse().
  • GetLastError() method is you get windows error code.
  • GetContentType(...) method is you have get MIME-TYPE.
  • ParseURL(...) method parse URL to protocol(HTTP, HTTPS) and address(or hostname) and port, URI.


Now, you have to simply do  HTTP GET REQUEST iteration.


GenericHTTPClient    httpClient;

    LPCTSTR szHTML=httpRequest.QueryResponse();
    LPVOID     lpMsgBuffer;

    MessageBox( reinterpret_cast<LPTSTR>(lpMsgBuffer), "ERROR", MB_OK);

This is HTTP POST REQUEST with file posting ( HTTP POST Multipart/form-data)

GenericHTTPClient *pClient=new GenericHTTPClient();

    pClient->AddPostArguments(__TAG_USRID, szUserID);
    pClient->AddPostArguments(__TAG_JUMIN, szSocialIndex);
    pClient->AddPostArguments(__TAG_SRC, szSource);
    pClient->AddPostArguments(__TAG_DST, szDestination);            
    pClient->AddPostArguments(__TAG_FORMAT, szFormat);
    pClient->AddPostArguments(__TAG_SUBJECT, szMessage);

        pClient->AddPostArguments(__TAG_CHARGE, "Y");
        pClient->AddPostArguments(__TAG_CHARGE, "N");
    pClient->AddPostArguments(__TAG_CPCODE, szCPCode);
    pClient->AddPostArguments(__TAG_FILE, szFile, TRUE);

        LPCTSTR szResult=pClient->QueryHTTPResponse();
#ifdef    _DEBUG
        LPVOID     lpMsgBuffer;



Thanks that you have been reading my article and my bad English. Poke tongue | ;-P


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


About the Author

Heo Yongseon
Software Developer
Korea (Republic of) Korea (Republic of)
Poke tongue | ;-P

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Comments and Discussions

GeneralAdding headers Pin
Nirav Doshi29-Jun-08 9:06
memberNirav Doshi29-Jun-08 9:06 
AnswerRe: Adding headers [modified] Pin
Nirav Doshi2-Jul-08 1:49
memberNirav Doshi2-Jul-08 1:49 
GeneralRe: Adding headers Pin
Ray Gerami27-Jul-09 10:09
memberRay Gerami27-Jul-09 10:09 
GeneralReading binary data Pin
Edyb27-Jun-08 4:10
memberEdyb27-Jun-08 4:10 
GeneralUpload file with size greater that 3MB Pin
hishree24-Jun-08 21:06
memberhishree24-Jun-08 21:06 
QuestionSupport for HTTPS/SSL Pin
DavidJHubbard17-Jun-08 5:08
memberDavidJHubbard17-Jun-08 5:08 
Generalinvalid argument internetclosehandle argument1 hinternet:0x00cc0004 Pin
micosun29-Apr-08 8:11
membermicosun29-Apr-08 8:11 
QuestionWhy does the CheckConnectionExists() function fail when there is clearly an Internet Connection? Pin
Michael B Pliam24-Apr-08 17:31
memberMichael B Pliam24-Apr-08 17:31 
QuestionHelp about Upload the File(How to set the parameter) Pin
hishree16-Mar-08 20:36
memberhishree16-Mar-08 20:36 
GeneralSimple HTTP Client using WININET Pin
Asia_chenchen21-Sep-07 5:51
memberAsia_chenchen21-Sep-07 5:51 
Questionwhat is the usage 0f Response? Pin
sunwayland9-Jul-07 17:12
membersunwayland9-Jul-07 17:12 
Questionhelp me,how to send this post? Pin
shellhy4-Jul-07 0:40
membershellhy4-Jul-07 0:40 
GeneralBytes sent / received Pin
__TSX__23-Apr-07 2:02
member__TSX__23-Apr-07 2:02 
Generalsuck Pin
_ppr10-Dec-06 0:55
member_ppr10-Dec-06 0:55 
GeneralRe: suck Pin
H.J.Park26-Jul-11 16:55
memberH.J.Park26-Jul-11 16:55 
QuestionUnhandled exception at 0x7c84b273 in myProject.exe: 0xC0000005: Access violation reading location 0xcccccccc. Pin
juhtzyy31-Oct-06 20:02
memberjuhtzyy31-Oct-06 20:02 
AnswerRe: Unhandled exception at 0x7c84b273 in myProject.exe: 0xC0000005: Access violation reading location 0xcccccccc. Pin
Michael B Pliam1-Dec-06 16:16
memberMichael B Pliam1-Dec-06 16:16 
GeneralRe: Unhandled exception at 0x7c84b273 in myProject.exe: 0xC0000005: Access violation reading location 0xcccccccc. Pin
Earnol23-Apr-07 0:03
memberEarnol23-Apr-07 0:03 
GeneralRe: Unhandled exception at 0x7c84b273 in myProject.exe: 0xC0000005: Access violation reading location 0xcccccccc. Pin
khanathar78626-Nov-07 4:37
memberkhanathar78626-Nov-07 4:37 
QuestionA HTTPSendRequest Problem Pin
jiangrenkuan26-Oct-06 21:31
memberjiangrenkuan26-Oct-06 21:31 
GeneralRe: A HTTPSendRequest Problem Pin
raghup1326-Oct-06 23:34
memberraghup1326-Oct-06 23:34 
AnswerRe: A HTTPSendRequest Problem Pin
shellhy22-Jul-07 3:10
membershellhy22-Jul-07 3:10 
GeneralError LNK2005 Pin
Alex_j2-Sep-06 2:37
memberAlex_j2-Sep-06 2:37 
Generalthe SESSIONID can't change Pin
shellhy14-Aug-06 7:54
membershellhy14-Aug-06 7:54 
QuestionHow to to POST Data? Pin
Adeel6887-Aug-06 2:35
memberAdeel6887-Aug-06 2:35 
GeneralCan't compile Pin
Adeel6887-Aug-06 2:24
memberAdeel6887-Aug-06 2:24 
GeneralRe: Can't compile Pin
andriuha13-Sep-06 2:14
memberandriuha13-Sep-06 2:14 
GeneralNeed help in uploading image Pin
ranu_hai28-Jul-06 0:02
memberranu_hai28-Jul-06 0:02 
Generalplease give me a next version Pin
shellhy1-Jun-06 1:42
membershellhy1-Jun-06 1:42 
QuestionHow do you format a POST string to produce a line break in the HTML output? [modified] Pin
Michael B Pliam26-May-06 7:13
memberMichael B Pliam26-May-06 7:13 
GeneralProblem with AddPostArguments Pin
Michael B Pliam22-May-06 4:48
memberMichael B Pliam22-May-06 4:48 
GeneralRe: Problem with AddPostArguments Pin
Mike Pliam22-May-06 13:13
memberMike Pliam22-May-06 13:13 
GeneralRe: solution Pin
arieharieh26-May-06 1:51
memberarieharieh26-May-06 1:51 
GeneralRe: solution Pin
Michael B Pliam26-May-06 6:46
memberMichael B Pliam26-May-06 6:46 
GeneralIt's nice module But found one Error maybe.. Pin
nami034218-May-06 2:46
membernami034218-May-06 2:46 
GeneralError C2065 : "httpRequest" : no declaration identifier Pin
langzi011526-Apr-06 18:56
memberlangzi011526-Apr-06 18:56 
GeneralRe: Error C2065 : "httpRequest" : no declaration identifier Pin
Member 853086830-Jan-12 3:39
memberMember 853086830-Jan-12 3:39 
Generalcan't compile Pin
nubz22-Mar-06 0:37
membernubz22-Mar-06 0:37 
GeneralRe: can't compile Pin
Just do it4-Apr-06 5:33
memberJust do it4-Apr-06 5:33 
QuestionHelp - Login to internet sites Pin
ddalmia20008-Dec-05 17:28
memberddalmia20008-Dec-05 17:28 
AnswerRe: Help - Login to internet sites Pin
Yongseon Heo19-Dec-05 17:11
memberYongseon Heo19-Dec-05 17:11 
QuestionHow to go througn authentication with HTTP proxy Pin
dmaster122-Nov-05 19:58
memberdmaster122-Nov-05 19:58 
AnswerRe: How to go througn authentication with HTTP proxy Pin
Yongseon Heo19-Dec-05 17:12
memberYongseon Heo19-Dec-05 17:12 
GeneralHelp using multi part Pin
Lotlikar21-Nov-05 0:55
memberLotlikar21-Nov-05 0:55 
GeneralHelp using multi part Pin
Lotlikar21-Nov-05 0:48
memberLotlikar21-Nov-05 0:48 
GeneralHian There! Pin
ThatsAlok2-Oct-05 18:22
memberThatsAlok2-Oct-05 18:22 
GeneralAccess Violation Pin
herveback22-Aug-05 22:04
memberherveback22-Aug-05 22:04 
GeneralRe: Access Violation Pin
Michael B Pliam26-May-06 7:05
memberMichael B Pliam26-May-06 7:05 
Questionhow to add header in request Pin
Anonymous17-Aug-05 14:21
sussAnonymous17-Aug-05 14:21 
General12 errors &quot;unresolved external symbol&quot; Pin
anynoums29-Jul-05 21:52
sussanynoums29-Jul-05 21:52 

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