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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

Introduction

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

Class Overview

class GenericHTTPClient {
public:                    
    ...
    // CONSTRUCTOR & DESTRUCTOR
    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 = 
           GenericHTTPClient::RequestGetMethod);
    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);
    
protected:                
    ...
};
  • 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.

Usage

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

....

GenericHTTPClient    httpClient;

if(httpRequest.Request("http://www.codeproject.com")){
    LPCTSTR szHTML=httpRequest.QueryResponse();
}else{
    LPVOID     lpMsgBuffer;
    DWORD dwRet=FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | 
             FORMAT_MESSAGE_FROM_SYSTEM,
             NULL,
             httpRequest.GetLastError(),
             MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
             reinterpret_cast<LPTSTR>(&lpMsgBuffer),
             0,
             NULL);                         

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

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

GenericHTTPClient *pClient=new GenericHTTPClient();

    pClient->InitilizePostArguments();
    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);

    if(bCharge){
        pClient->AddPostArguments(__TAG_CHARGE, "Y");
    }else{
        pClient->AddPostArguments(__TAG_CHARGE, "N");
    }
    pClient->AddPostArguments(__TAG_CPCODE, szCPCode);
    pClient->AddPostArguments(__TAG_FILE, szFile, TRUE);

    if(pClient->Request(szURL, 
        GenericHTTPClient::RequestPostMethodMultiPartsFormData)){        
        LPCTSTR szResult=pClient->QueryHTTPResponse();
    }else{
#ifdef    _DEBUG
        LPVOID     lpMsgBuffer;
        DWORD dwRet=FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER |
                      FORMAT_MESSAGE_FROM_SYSTEM,
                      NULL,
                      pClient->GetLastError(),
                      MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                      reinterpret_cast<LPTSTR>(&lpMsgBuffer),
                      0,
                      NULL);
        OutputDebugString(reinterpret_cast<LPTSTR>(lpMsgBuffer));
        LocalFree(lpMsgBuffer);
#endif
    }

}

Thanks

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

License

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About the Author

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

Comments and Discussions

 
GeneralAdding headers Pin
Nirav Doshi29-Jun-08 10:06
memberNirav Doshi29-Jun-08 10:06 
AnswerRe: Adding headers [modified] Pin
Nirav Doshi2-Jul-08 2:49
memberNirav Doshi2-Jul-08 2:49 
GeneralRe: Adding headers Pin
Ray Gerami27-Jul-09 11:09
memberRay Gerami27-Jul-09 11:09 
GeneralReading binary data Pin
Edyb27-Jun-08 5:10
memberEdyb27-Jun-08 5:10 
GeneralUpload file with size greater that 3MB Pin
hishree24-Jun-08 22:06
memberhishree24-Jun-08 22:06 
QuestionSupport for HTTPS/SSL Pin
DavidJHubbard17-Jun-08 6:08
memberDavidJHubbard17-Jun-08 6:08 
Generalinvalid argument internetclosehandle argument1 hinternet:0x00cc0004 Pin
micosun29-Apr-08 9:11
membermicosun29-Apr-08 9:11 
QuestionWhy does the CheckConnectionExists() function fail when there is clearly an Internet Connection? Pin
Michael B Pliam24-Apr-08 18:31
memberMichael B Pliam24-Apr-08 18:31 
QuestionHelp about Upload the File(How to set the parameter) Pin
hishree16-Mar-08 21:36
memberhishree16-Mar-08 21:36 
GeneralSimple HTTP Client using WININET Pin
Asia_chenchen21-Sep-07 6:51
memberAsia_chenchen21-Sep-07 6:51 

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