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Posted 23 Mar 2003

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Simple HTTP Client using WININET

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3.76/5 (46 votes)
2 Sep 20031 min read
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

C++
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.

C++
....

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)

C++
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. ;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

 
GeneralRe: Stack corruption during non-multipart post Pin
nguyendhex4-Apr-05 0:24
Membernguyendhex4-Apr-05 0:24 
GeneralRe: Stack corruption during non-multipart post Pin
Heo Yongseon4-Apr-05 2:38
MemberHeo Yongseon4-Apr-05 2:38 
GeneralOne bug on this class Pin
Laurentiu Soica14-Mar-05 2:50
MemberLaurentiu Soica14-Mar-05 2:50 
GeneralRe: One bug on this class Pin
Heo Yongseon31-Mar-05 13:55
MemberHeo Yongseon31-Mar-05 13:55 
GeneralPost Pin
Y G11-Mar-05 10:04
MemberY G11-Mar-05 10:04 
GeneralUnresolved externals Pin
Member 86764822-Feb-05 10:23
MemberMember 86764822-Feb-05 10:23 
GeneralRe: Unresolved externals Pin
Member 86764823-Feb-05 4:42
MemberMember 86764823-Feb-05 4:42 
GeneralSSL won't work, workaround included Pin
ericb_summit1-Feb-05 12:19
Memberericb_summit1-Feb-05 12:19 
This will not work with SSL sites. To make it support SSL you will need to modify the calls HttpOpenRequest to include the flag INTERNET_FLAG_SECURE.

See:

http://support.microsoft.com/default.aspx?scid=kb;en-us;168151
QuestionDoes it support setting cookies to url? Pin
cop115-Jan-05 7:37
Membercop115-Jan-05 7:37 
AnswerRe: Does it support setting cookies to url? Pin
Heo Yongseon18-Jan-05 17:41
MemberHeo Yongseon18-Jan-05 17:41 
GeneralRuntime overflow - suggestion Pin
Sina Falahati25-Dec-04 4:05
MemberSina Falahati25-Dec-04 4:05 
GeneralRe: Runtime overflow - suggestion Pin
Heo Yongseon29-Dec-04 13:45
MemberHeo Yongseon29-Dec-04 13:45 
QuestionCan it be use with Borland C++ Builder Pin
bryu29-Nov-04 21:49
Memberbryu29-Nov-04 21:49 
Generalhas some spell problem in explations. Pin
jakejang25-Aug-04 16:44
Memberjakejang25-Aug-04 16:44 
GeneralRe: has some spell problem in explations. Pin
Heo Yongseon26-Aug-04 16:41
MemberHeo Yongseon26-Aug-04 16:41 
GeneralGetting problem on Windows XP Pin
Sumit Kapoor12-Aug-04 23:47
MemberSumit Kapoor12-Aug-04 23:47 
GeneralRe: Getting problem on Windows XP Pin
Heo Yongseon17-Aug-04 16:00
MemberHeo Yongseon17-Aug-04 16:00 
GeneralRe: Getting problem on Windows XP Pin
Sumit Kapoor19-Aug-04 7:49
MemberSumit Kapoor19-Aug-04 7:49 
GeneralRe: Getting problem on Windows XP Pin
Heo Yongseon19-Aug-04 16:11
MemberHeo Yongseon19-Aug-04 16:11 
GeneralGenericHTTPClient::Request will not return Pin
Member 13407119-Jun-04 15:44
MemberMember 13407119-Jun-04 15:44 
GeneralRe: GenericHTTPClient::Request will not return Pin
Heo Yongseon9-Jun-04 16:12
MemberHeo Yongseon9-Jun-04 16:12 
GeneralSumit: How to Download File using http Pin
Sumit Kapoor28-May-04 21:22
MemberSumit Kapoor28-May-04 21:22 
GeneralRe: Sumit: How to Download File using http Pin
Heo Yongseon30-May-04 14:55
MemberHeo Yongseon30-May-04 14:55 
GeneralSumit again with one problem: Pin
Sumit Kapoor18-May-04 19:07
MemberSumit Kapoor18-May-04 19:07 
GeneralRe: Sumit again with one problem: Pin
Heo Yongseon30-May-04 14:51
MemberHeo Yongseon30-May-04 14:51 

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