C++ RSS C++ RSS

GET! GOT! GOTCHA! I still don't Get it...

Please support our C++ advertiser: Intel Parallel Studio Home
Reply

•
•
Join Date: Jan 2005
Posts: 11
Reputation: Tester2 is an unknown quantity at this point 
Solved Threads: 0
Tester2 Tester2 is offline Offline
Newbie Poster

GET! GOT! GOTCHA! I still don't Get it...

 
0
  #1
Feb 6th, 2005
I am one of the many people trying to grasp something new in this forum. I come here, because it seems to frequented by C++ experts, who actually try to respond.

I am trying to learn how to program an HTTP protocol based text file download. I have searched far and wide on the internet, and find both commercial and non-commercial code to provide internet functionality. I have not found a single, Borland Builder based, windows socket and http tutorial.

I did download one of the free, non-commercial files, and it did compile and run on Borland Builder 6.0 with just a few changes. I believe it has a socket, because the RichText box control I am using fills with various obscure facts about my internet service provider (including its usual $9.95 per month advertisement), all in text, when I activate the code that was said to perform an HTTP based POST. I think that means that the code was able to access a socket. I'm not as sure that it was able to create the socket, as I already had internet explorer opened to a web site and was connected.

IF YOU'VE READ THIS FAR, then perhaps I should note that what I ultimately need to do is to access a password protected directory, and download a text file using http protocol. I was told this was both possible and none too difficult. (I was at my limits getting the file I downloaded to compile under Borland Builder.) I did search for and purchase multiple texts on internet programming, but all via mail. The local bookstores and college library have nothing in them describing C++ programming of HTTP commands, I've spent days looking before I came here. I am attaching some code. It is supposed to accomplish an internet POST. I understand that is useful for chat rooms and a few other things, but not for my needs at present. To be perfectly straightforward, much of what this code does is Greek to me. I downloaded it to see if it could be made to work, as a roadmap to a means by which to get a socket connection. Step two is trying to figure out how to convert the POST function to a GET function that will download a text file from a password protected directory. (I honestly don't know, in the context of this code, what it is supposed to return, or why I received the info I did from an internet service provider whose url I wasn't trying to use.)

I'll post the code I downloaded. If anyone can get me to the point where this code will enable me to access a password protected directory, we'll call it:

"http://mysite.hostserver.com/secret"

with user name: myname

and password: mypassword,

and download file: mytextfile.txt using http,

that would be, as the waitress on the television commercial says, "great".

The code I was using is based upon Windows sockets and winsock2.h. I don't want to change this. I just want it to work. Any help would be much appreciated.

BORLAND BUILDER 6.0 CODE FOLLOWS:

C++ Syntax (Toggle Plain Text) 
  1. /*
  2.  *                                 http_post.cpp
  3.  *
  4.  * by Uday Chitragar - 2004/Dec/01
  5.  *
  6.  * This software is provided 'as-is', without any express or implied
  7.  * warranty. In no event will the authors be held liable for any
  8.  * damages arising from the use of this software.
  9.  *
  10.  * Permission is granted to anyone to use this software for any
  11.  * purpose, including commercial applications, and to alter it and
  12.  * redistribute it freely, subject to the following restrictions:
  13.  *
  14.  * 1. The origin of this software must not be misrepresented; you must
  15.  * not claim that you wrote the original software. If you use this
  16.  * software in a product, an acknowledgment in the product documentation
  17.  * would be appreciated but is not required.
  18.  *
  19.  * 2. Altered source versions must be plainly marked as such, and
  20.  * must not be misrepresented as being the original software.
  21.  *
  22.  * 3. This notice may not be removed or altered from any source
  23.  * distribution.
  24.  *
  25.  * */
  26.  
  27. /* 
  28.  * Notes:
  29.  * This source demonstrates sending HTTP POST request to webserver from C++
  30.  * This uses sockets hence can be compiled on Linux, UNIX, Win
  31.  */
  32.  
  33. //#define LINUX_OS
  34. #define WIN_OS
  35. #define _DEBUG_PRINT(X)   /* X */
  36.  
  37. //For commn
  38. #include <iostream.h>
  39. #include <string.h>
  40. #include <stdlib.h>
  41. #include <assert.h>
  42.  
  43. //#ifdef LINUX_OS
  44. // #include <netdb.h>
  45. //#endif
  46.  
  47. //#ifdef WIN_OS
  48. // #include <Winsock2.h>
  49. //#endif
  50.  
  51.  
  52. #define SEND_RQ(MSG) \
  53.                 /*cout<<send_str;*/ \
  54.   send(sock,MSG,strlen(MSG),0);
  55.  
  56.  
  57. using namespace std;
  58. //<exe> hostname api parameters
  59. int request (char* hostname, char* api, char* parameters, string& message)
  60. {
  61.  
  62. 	#ifdef WIN_OS
  63. 	{
  64. 		WSADATA	WsaData;
  65. 		WSAStartup (0x0101, &WsaData);
  66. 	}
  67. 	#endif
  68.     struct sockaddr_in {
  69.         short   sin_family;
  70.         u_short sin_port;
  71.         struct  in_addr sin_addr;
  72.         char    sin_zero[8];
  73. };
  74.     sockaddr_in sin;
  75.     int sock = socket (AF_INET, SOCK_STREAM, 0);
  76.     if (sock == -1) {
  77. 		return -100;
  78. 	}
  79.     sin.sin_family = AF_INET;
  80.     sin.sin_port = htons( (unsigned short)80);
  81.  
  82.     struct hostent * host_addr = gethostbyname(hostname);
  83.     if(host_addr==NULL) {
  84.       _DEBUG_PRINT( cout<<"Unable to locate host"<<endl );
  85.       return -103;
  86.     }
  87.     sin.sin_addr.s_addr = *((int*)*host_addr->h_addr_list) ;
  88.     _DEBUG_PRINT( cout<<"Port :"<<sin.sin_port<<", Address : "<< sin.sin_addr.s_addr<<endl);
  89.  
  90.     if( connect (sock,(const struct sockaddr *)&sin, sizeof(sockaddr_in) ) == -1 ) {
  91.      _DEBUG_PRINT( cout<<"connect failed"<<endl ) ;
  92.      return -101;
  93.     }
  94.  
  95.  string send_str;
  96.  
  97.  SEND_RQ("POST ");
  98.  SEND_RQ(api);
  99.  SEND_RQ(" HTTP/1.0\r\n");
  100.  SEND_RQ("Accept: */*\r\n");
  101.  SEND_RQ("User-Agent: Mozilla/4.0\r\n");
  102.  
  103.  char content_header[100];
  104.  sprintf(content_header,"Content-Length: %d\r\n",strlen(parameters));
  105.  SEND_RQ(content_header);
  106.  SEND_RQ("Accept-Language: en-us\r\n");
  107.  SEND_RQ("Accept-Encoding: gzip, deflate\r\n");
  108.  SEND_RQ("Host: ");
  109.  SEND_RQ("hostname");
  110.  SEND_RQ("\r\n");
  111.  SEND_RQ("Content-Type: application/x-www-form-urlencoded\r\n");
  112.  
  113. //If you need to send a basic authorization  
  114. //NOTE:  IS THIS TO GET
  115. // PAST YOUR OWN SITE'S ADMINISTRATOR PASSWORD, OR THE
  116. // DIRECTORY PASSWORD?  I NEED TO GET PAST MY DIRECTORY
  117. // PROTECTING PASSWORD.  
  118. //(USING NON-PASSWORD PROTECTED DIRECTORY
  119. // ISN'T AN OPTION).
  120. //string Auth        = "mysite:mypassword";
  121. //string AuthInfo = Auth;
  122.  //Figureout a way to encode test into base64 !  WHAT????
  123. //string AuthInfo    = base64_encode(reinterpret_cast<const unsigned char*>(Auth.c_str()),Auth.length());
  124. //string sPassReq    = "Authorization: Basic " + AuthInfo;
  125. //SEND_RQ(sPassReq.c_str());
  126.  
  127.  SEND_RQ("\r\n");
  128.  SEND_RQ("\r\n");
  129.  SEND_RQ(parameters);
  130.  SEND_RQ("\r\n");
  131.  
  132.  _DEBUG_PRINT(cout<<"####HEADER####"<<endl);
  133.  char c1[1];
  134.  int l,line_length;
  135.  bool loop = true;
  136.  bool bHeader = false;
  137.  
  138.  while(loop) {
  139.    l = recv(sock, c1, 1, 0);
  140.    if(l<0) loop = false;
  141.    if(c1[0]=='\n') {
  142.        if(line_length == 0) loop = false;
  143.  
  144.        line_length = 0;
  145.        if(message.find("200") != string::npos)
  146. 	       bHeader = true;
  147.  
  148.    }
  149.    else if(c1[0]!='\r') line_length++;
  150.    _DEBUG_PRINT( cout<<c1[0]);
  151.    message += c1[0];
  152.  }
  153.  
  154.  message="";
  155.  if(bHeader) {
  156.  
  157.      _DEBUG_PRINT( cout<<"####BODY####"<<endl) ;
  158.      char p[1024];
  159.      while((l = recv(sock,p,1023,0)) > 0)  {
  160.          _DEBUG_PRINT( cout.write(p,l)) ;
  161. 	     p[l] = '\0';
  162. 	     message += p;
  163.      }
  164.  
  165.      _DEBUG_PRINT( cout << message.c_str());
  166.  } else {
  167. 	 return -102;
  168.  }
  169.  
  170.  
  171. #ifdef WIN_OS
  172.    WSACleanup( );
  173. #endif
  174.  
  175.  return 0;
  176. }
  177.  
  178.  
  179. void __fastcall TForm1::Button1Click(TObject *Sender)
  180. {
  181.   string message;
  182.   char* mysite = "www.netzero.com";
  183.   char* postapi =  "/post_url.pl";
  184.   char* myparams = "search=hello&date=todat";
  185. //Following line originally used "string& message".  I don't know what
  186. //that was supposed to accomplish, but what follows
  187. //was what I was able to get to compile, with "string message" instead.
  188.   int errornumberreturned = request(mysite, postapi, myparams, message);
  189.   const char* mymessage = message.c_str();
  190.   RichEdit1->Text= mymessage;
  191.   RichEdit2->Text = errornumberreturned;
  192. //errornumberreturned was 0  -> never got to functions to return error code??
  193.   // message contains response!  WELL, it contained a response.  
  194. }
  195. //---------------------------------------------------------------------------
Last edited by alc6379; Feb 8th, 2005 at 12:27 pm.
Reply With Quote Quick reply to this message  
Reply

Quick Reply to Thread
This thread is more than three months old.
Perhaps start a new thread instead?
•
•
•
•
•
•
•
•
Message:
•
•
•
•



Similar Threads
Other Threads in the C++ Forum
Thread Tools Search this Thread



api array based beginner binary bitmap c++ c/c++ calculator char char* class code coding compile compiler console conversion count data database delete deploy developer dll download dynamic dynamiccharacterarray email encryption error file forms fstream function functions game getline givemetehcodez graph gui homeworkhelp homeworkhelper iamthwee ifstream input int integer java lib linker list loop looping loops map math matrix memory multiple news node number numbertoword output parameter pointer problem program programming project proxy python random read recursion recursive reference rpg sorting string strings struct temperature template text text-file tree url variable vector video visual visualstudio win32 windows winsock word wordfrequency wxwidgets
About Us | Contact Us | Advertise | DaniWeb | Acceptable Use Policy | RSS Feed

©2003 - 2009 DaniWeb® LLC