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


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

Supported methods are:

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

Class Overview

// synchronized www client
 class W3Client {
  enum w3t { w3ftp, w3http, w3https };
  enum w3m { reqGet, reqPost, reqPostMultipartsFormdata };
  W3Client(){ _hOpen=NULL; _hConnection=NULL, _hRequest=NULL; }
  virtual ~W3Client(){ InitializePostArguments(); InitializeCookies();}
  // 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 {
  bool Connect(const char *szaddress,
            const char *szuser=NULL,
            const char *szpassword=NULL,
            const char *szagent=__W3_DEFAULT_AGENT);
  bool Connect(const char *szaddress, long nport,
          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){
   return W3Client::Response(buf, len);
  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.


  1. Synchronized HTTP GET

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

    int main(int argc, char *argv[]){
     W3Client client;
      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);
     return 0;
  3. Asynchronized HTTP client

    #include <iostream>
    #include <net/w3c.h>
    #include <wt.h>
    #include <windows.h>
    using namespace std;
    class AsDown : public AsyncW3Client, public IWORKERTHREAD {
     AsDown(unsigned int idx):AsyncW3Client(), IWORKERTHREAD(idx){}
     virtual ~AsDown(){}
     virtual void OnWork(){
       unsigned char buf[1024]="\0";
       while(Response(buf, 1024)){
         cout << reinterpret_cast<char*>(buf);
         memset(buf, 0x00, 1024);
    void CALLBACK __getstatus(  HINTERNET hInternet,
                   DWORD_PTR dwContext,
                   DWORD dwInternetStatus,
                   LPVOID lpvStatusInformation,
                   DWORD dwStatusInformationLength
     AsyncW3Client *pcontext=reinterpret_cast<AsyncW3Client*>(dwContext);
     unsigned long nbytes=0;
      cout << "request sending..." << endl;
       unsigned long *pnsent=(unsigned long*)lpvStatusInformation;
       cout << "bytes sent: " << *pnsent << endl;
       cout << "request sent..." << endl;
       INTERNET_ASYNC_RESULT *pAsyncRes = 
              (INTERNET_ASYNC_RESULT *)lpvStatusInformation;
       cout << "Function call finished" << endl;
       cout << "dwResult: " << pAsyncRes->dwResult << endl;
       cout << "dwError:  " << pAsyncRes->dwError << endl;
        cout << "request complete..." << endl;  
    int main(int argc, char *argv[]){ 
     AsDown client(3);
     if(client.Connect("", __getstatus)){
      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);
      client.AddPostArgument("f", "sss");
      client.Request("/test2.php", AsDown::reqPost);  
     return 0;


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


About the Author

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

Comments and Discussions

GeneralDownload file Pinmembermeouvn9-Mar-06 17:04 
GeneralRe: Download file Pinmember_aleksei31-Dec-06 4:13 
QuestionPost xml data Pinmembertino5516-Feb-06 23:50 
QuestionSmall bug? or my mistake? PinmemberYails5-Dec-05 6:05 
AnswerRe: Small bug? or my mistake? PinmemberYongseon Heo19-Dec-05 18:09 
Generalurl encoding Pinmembergkutiel22-Oct-05 8:43 
GeneralRe: url encoding PinmemberYongseon Heo19-Dec-05 18:08 
GeneralProgress in uploading file PinmemberAkbaraka10-Aug-05 5:46 
First of all, thank you for developen the class-it's very useful
I need to upload file (HTTP) using form. Since the files may be pretty large, I would need to get some feedback of the progress.
How can I do this?
Thanks a lot.
GeneralRe: Progress in uploading file PinmemberYongseon Heo10-Aug-05 17:09 
GeneralRe: Progress in uploading file Pinmembermarlongrech30-Oct-06 6:53 
GeneralRe: Progress in uploading file Pinmembermarlongrech31-Oct-06 1:06 
QuestionRe: Progress in uploading file PinmemberAngel Kafazov7-Jan-09 5:42 
GeneralCrash / Fix when the connection internet is offline and bug in the return of the function Connect(...). Pinmemberalanlive30-Jun-05 22:38 
GeneralBug in AsyncW3Client PinmemberDean Hallman24-Jun-05 15:30 
GeneralHTTPS Not Working Pinsussneverneverland15-Jun-05 7:26 
GeneralRe: HTTPS Not Working PinmemberTomazZ28-Jul-05 4:49 
GeneralRe: HTTPS Not Working PinmemberTomazZ28-Jul-05 4:54 
GeneralRe: HTTPS Not Working Pinmemberdungbkhn22-Aug-05 19:16 
GeneralRe: HTTPS Not Working PinmemberTomazZ5-Dec-05 3:08 
GeneralRe: HTTPS Not Working Pinmemberszuzso14-Dec-05 3:40 
GeneralRe: HTTPS Not Working Pinmembermeouvn8-Mar-06 21:13 
GeneralRe: HTTPS Not Working Pinmembermeouvn9-Mar-06 17:08 
GeneralRe: HTTPS Not Working Pinmemberzhirenze9-Dec-06 4:47 
GeneralUnicode Version PinmemberSnowshoeMJ20-May-05 10:42 
GeneralRe: Unicode Version PinmemberYongseon Heo24-May-05 15:09 

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