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WWW (HTTP/HTTPS/FTP) Client using WININET

, 3 May 2004
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Synchronized/asynchronized WWW client: HTTP/HTTPS GET, POST, POST multiparts/form-data supported. FTP GET FILE, PUT FILE supported too.

Introduction

This class is used for HTTP/HTTPS request, and FTP request.

Supported methods are:

  • HTTP/HTTPS
    1. GET
    2. POST
    3. POST multiparts/form-data
  • FTP
    1. GET FILE
    2. PUT FILE

Class Overview

// synchronized www client
 class W3Client {
 public:
  enum w3t { w3ftp, w3http, w3https };
  enum w3m { reqGet, reqPost, reqPostMultipartsFormdata };
 public:
  W3Client(){ _hOpen=NULL; _hConnection=NULL, _hRequest=NULL; }
  virtual ~W3Client(){ InitializePostArguments(); InitializeCookies();}
 public:  
  // connection handling
  bool Connect(const char *szaddress,
         const char *szuser=NULL, const char *szpassword=NULL, 
      const char *szagent=__W3_DEFAULT_AGENT);
  virtual bool Connect(const char *szaddress, long nport,
           const char *szuser=NULL, const char *szpassword=NULL,
           w3t t=w3http, const char *szagent=__W3_DEFAULT_AGENT);
  const char *GetURI(){ return _szuri.c_str(); }
  void Close();

  // post argument handling
  void InitializePostArguments();
  void AddPostArgument(const char *szname, const int nvalue);
  void AddPostArgument(const char *szname, const long nvalue);
  void AddPostArgument(const char *szname, const float nvalue);
  void AddPostArgument(const char *szname, const double nvalue);
  void AddPostArgument(const char *szname, 
                      const char *szvalue, bool bfile=false);
  
  // cookie handling
  void InitializeCookies();
  void AddCookie(const char *szname, const double value);
  void AddCookie(const char *szname, const float value);
  void AddCookie(const char *szname, const long value);
  void AddCookie(const char *szname, const int value);  
  void AddCookie(const char *szname, const char *szvalue);
 
  // http/https request handling
  bool Request(const char *szuri, w3m m=reqGet, const char *szref=NULL);
  unsigned long Response(unsigned char *buf, unsigned long len);
  unsigned int QueryResult();
  const char * QueryContentType();
  unsigned long QueryContentLength();
  unsigned long QueryCookie(unsigned char *buf, 
          unsigned long len, unsigned long idx=0);
  unsigned long QueryRawHeader(unsigned char *buf, unsigned long len);
 
  // ftp handling
  bool PutFile(const char *szuri, const char *szfile, bool ascii=false);
  bool GetFile(const char *szuri, const char *szfile, bool ascii=false);
  unsigned long PutFile(const char *szuri, unsigned char *buf, 
                        unsigned long len, bool ascii=false);
  unsigned long GetFile(const char *szuri, unsigned char *buf, 
                        unsigned long len, bool ascii=false);

 ...
 };

 // Asynchronized www client
 class AsyncW3Client : public W3Client {
 ...
 public:
  bool Connect(const char *szaddress,
            INTERNET_STATUS_CALLBACK lpfn,
            const char *szuser=NULL,
            const char *szpassword=NULL,
            const char *szagent=__W3_DEFAULT_AGENT);
  bool Connect(const char *szaddress, long nport,
          INTERNET_STATUS_CALLBACK lpfn,
          const char *szuser=NULL, const char *szpassword=NULL,
          w3t t=w3http, const char *szagent=__W3_DEFAULT_AGENT);
  bool Request(const char *szuri, w3m m=reqGet, const char *szref=NULL){
       _hCompleteRequestEvent=::CreateEvent(NULL, FALSE, FALSE, NULL);
       return W3Client::Request(szuri, m, szref);
  }
  unsigned long Response(unsigned char *buf, unsigned long len){
   ::CloseHandle(_hCompleteRequestEvent);
   _hCompleteRequestEvent=NULL;
   return W3Client::Response(buf, len);
  }
 public:
  void SetCompleteRequest();
  bool WaitCompleteRequest(unsigned long ntime=INFINITE);
 ...
 };
  1. Synchronized W3Client

    • Connect(...) method connects to HTTP server.
    • Close() method closes connection. These are used with RequestOfURI(...).
    • InitializePostArguments() method initializes POST arguments.
    • AddPostArgument(...) method is supported so that you can add new POST arguments of the following types: string, int, long, float, double, file.
    • Request(...) method is for you to attempt request for HTTP Request (GET, POST, POST-MULTIPARTFORMDATA) with URL. HTTP METHOD indirector has 3 types.
    • InitializeCookies() method initializes cookie values.
    • AddCookie(...) method adds cookie vars.
      • W3Client::reqGet is HTTP GET Request.
      • W3Cient::reqPost is HTTP POST Request.
      • W3Client::reqPostMultiPartsFormData is HTTP POST Request with BINARY FORM DATA.
    • Response(...) method is that you have HTTP Response by bytes.
    • QueryResult() method is you have receive HTTP Request result value.
  2. Asynchronized W3Client

    • SetCompleteRequest() method commits complete Request to AsyncW3Client.
    • WaitCompleteRequest() method waits for Request to be completed.

Usage

  1. Synchronized HTTP GET

    #include <iostream>
    #include "w3c.h"
    
    using namespace std;
    
    int main(int argc, char *argv[]){
      
      W3Client w3;
     
      if(w3.Connect("http://google.com/")){
       if(w3.Request("/")){
        char buf[1024]="\0";
        while(w3.Response(reinterpret_cast<unsigned char *>(buf), 1024))
         cout << buf ;
      }
       w3.Close();
      }
      return 0;
    }
  2. Synchronized HTTP POST multiparts/form-data

    int main(int argc, char *argv[]){
     
     W3Client client;
    
     if(client.Connect("http://gooshin.zzem.net/")){
      client.AddPostArgument("f[]", "d:\\log1.txt", true);
      client.AddPostArgument("f[]", "d:\\log2.txt", true);
      client.AddPostArgument("f[]", "d:\\log3.txt", true);
      if(client.Request("/test.php", W3Client::reqPostMultipartsFormdata)){
       char buf[1024]="\0";
       while(client.Response(reinterpret_cast<unsigned char*>(buf), 1024)>0){
        cout << buf << endl;
        memset(buf, 0x00, 1024);
       }
      }
      client.Close();
     }
    
     return 0;
    }
  3. Asynchronized HTTP client

    #include <iostream>
    #include <net/w3c.h>
    #include <wt.h>
    #include <windows.h>
    
    using namespace std;
    
    CRITICAL_SECTION __cs;
    
    class AsDown : public AsyncW3Client, public IWORKERTHREAD {
    public:
     AsDown(unsigned int idx):AsyncW3Client(), IWORKERTHREAD(idx){}
     virtual ~AsDown(){}
    private:
     virtual void OnWork(){
      while(true){
       WaitCompleteRequest();
       unsigned char buf[1024]="\0";
       while(Response(buf, 1024)){
         ::EnterCriticalSection(&__cs);
         cout << reinterpret_cast<char*>(buf);
         ::LeaveCriticalSection(&__cs);
         memset(buf, 0x00, 1024);
       }
       ::Sleep(500);
      }
     }
    };
    void CALLBACK __getstatus(  HINTERNET hInternet,
                   DWORD_PTR dwContext,
                   DWORD dwInternetStatus,
                   LPVOID lpvStatusInformation,
                   DWORD dwStatusInformationLength
                   ){
     AsyncW3Client *pcontext=reinterpret_cast<AsyncW3Client*>(dwContext);
     
     unsigned long nbytes=0;
      ::EnterCriticalSection(&__cs);
      switch(dwInternetStatus){
     case INTERNET_STATUS_SENDING_REQUEST:
      cout << "request sending..." << endl;
      break;
     case INTERNET_STATUS_REQUEST_SENT:
      {
       unsigned long *pnsent=(unsigned long*)lpvStatusInformation;
       cout << "bytes sent: " << *pnsent << endl;
       nbytes+=*pnsent;
       cout << "request sent..." << endl;
      }
      break;
     case INTERNET_STATUS_REQUEST_COMPLETE:
      {
       INTERNET_ASYNC_RESULT *pAsyncRes = 
              (INTERNET_ASYNC_RESULT *)lpvStatusInformation;
       cout << "Function call finished" << endl;
       cout << "dwResult: " << pAsyncRes->dwResult << endl;
       cout << "dwError:  " << pAsyncRes->dwError << endl;
       cout.flush();
       pcontext->SetCompleteRequest();
        cout << "request complete..." << endl;  
      }
      break;
      }
      ::LeaveCriticalSection(&__cs);
     
      return;
    }
    int main(int argc, char *argv[]){ 
     ::InitializeCriticalSection(&__cs);
     AsDown client(3);
     if(client.Connect("http://gooshin.zzem.net/", __getstatus)){
      __wtstart(client);
      client.Request("/test.php");
      Sleep(5000);
      client.InitializePostArguments();
      client.AddPostArgument("f[]", "d:\\log1.txt", true);
      client.AddPostArgument("f[]", "d:\\log2.txt", true);
      client.AddPostArgument("f[]", "d:\\log3.txt", true);
      client.Request("/test.php", AsDown::reqPostMultipartsFormdata);
      Sleep(5000);
      client.InitializePostArguments();
      client.AddPostArgument("f", "sss");
      client.Request("/test2.php", AsDown::reqPost);  
      Sleep(5000);
      
      __wtwait(client);
      client.Close();
     }
     ::DeleteCriticalSection(&__cs);
     return 0;
    }

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

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

Comments and Discussions

 
QuestionIf you want to get the webpages zipped, then replace W3Client::RequestGet with the following PinmemberEric Schwerzel26-Jun-14 13:25 
GeneralWorked fine with getting HTTPS pages PinmemberEric Schwerzel11-Jun-14 19:45 
GeneralNot able to run the sample!! Pinmembergu@z12-Nov-08 15:41 
QuestionAbout license PinmemberPrasVM16-Oct-08 0:07 
AnswerRe: About license PinmemberYongseon Heo16-Oct-08 1:25 
GeneralSmall bug with cookies Pinmemberoren.shnitzer24-Aug-08 0:17 
GeneralA question about AsyncW3Client PinmemberProtocol_yatsu23-Feb-08 6:49 
QuestionHow to manage a Timeout? Pinmembercact26-Sep-07 0:39 
GeneralYour Post Method Fails!!! PinmemberBill SerGio, The Infomercial King29-Jan-07 11:31 
GeneralRe: Your Post Method Fails!!! PinmemberSteve Thresher30-Apr-12 4:55 
Questionquestion about std:string? Pinmembertypg30-Aug-06 17:08 
GeneralPOST via SSL does not work for me Pinmemberkoehler12-Jul-06 12:32 
Generalif(_hOpen || _hOpen!=INVALID_HANDLE_VALUE) Pinmembercp66331110-Jul-06 23:40 
GeneralBug with ::HttpOpenRequest in your class [modified] Pinmembersbytov28-Jun-06 23:50 
GeneralRe: Bug with ::HttpOpenRequest in your class PinmemberGoatboy16028-Aug-06 10:11 
GeneralRe: Bug with ::HttpOpenRequest in your class Pinmemberpraveen7920-Nov-08 23:35 
Generalhere,how to login out yahoo email Pinmembershellhy26-Jun-06 0:23 
QuestionIWORKERTHREAD [modified] Pinmemberdaman37120-Jun-06 7:37 
AnswerRe: IWORKERTHREAD Pinmemberdaman37122-Jun-06 8:31 
General222 Pinmembershellhy13-Jun-06 1:07 
QuestionDialog and String Table all in KOREAN, How do I convert to English ? Pinmembercfilorux3-May-06 12:46 
GeneralSessions Pinmembereusto19-Apr-06 2:15 
GeneralRe: Sessions PinmemberYongseon Heo19-Apr-06 15:31 
GeneralDownload file Pinmembermeouvn9-Mar-06 16:04 
GeneralRe: Download file Pinmember_aleksei31-Dec-06 3:13 

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