Send HTTP-Post Request With Meta

bamdad · #1 (**permalink**) 06-03-2007, 07:42 PM

Hi Guys
I'm Trying To Send HTTP-Post request with metatrader.
i tried to write a dll for this action but it doesn't..
when i call the request(); function in dll, the Script/Indicator Will stop working...
here is the source code

PHP Code:


			
// pasargad.cpp : Defines the initialization routines for the DLL.

//



#include "stdafx.h"

#include "pasargad.h"



#define WIN_OS

#define _DEBUG_PRINT(X)   /* X */



#include <iostream>

#include <string>

#include <stdlib.h>

#include <assert.h>



#include <Winsock2.h>

#pragma comment( lib, "wsock32.lib" )



#define SEND_RQ(MSG) \

  send(sock,MSG,strlen(MSG),0);



#ifdef _DEBUG

#define new DEBUG_NEW

#undef THIS_FILE

static char THIS_FILE[] = __FILE__;

#endif



#define MT4_EXPFUNC __declspec(dllexport)



//

//    Note!

//

//        If this DLL is dynamically linked against the MFC

//        DLLs, any functions exported from this DLL which

//        call into MFC must have the AFX_MANAGE_STATE macro

//        added at the very beginning of the function.

//

//        For example:

//

//        extern "C" BOOL PASCAL EXPORT ExportedFunction()

//        {

//            AFX_MANAGE_STATE(AfxGetStaticModuleState());

//            // normal function body here

//        }

//

//        It is very important that this macro appear in each

//        function, prior to any calls into MFC.  This means that

//        it must appear as the first statement within the 

//        function, even before any object variable declarations

//        as their constructors may generate calls into the MFC

//        DLL.

//

//        Please see MFC Technical Notes 33 and 58 for additional

//        details.

//



/////////////////////////////////////////////////////////////////////////////

// CPasargadApp



BEGIN_MESSAGE_MAP(CPasargadApp, CWinApp)

    //{{AFX_MSG_MAP(CPasargadApp)

        // NOTE - the ClassWizard will add and remove mapping macros here.

        //    DO NOT EDIT what you see in these blocks of generated code!

    //}}AFX_MSG_MAP

END_MESSAGE_MAP()



/////////////////////////////////////////////////////////////////////////////

// CPasargadApp construction



CPasargadApp::CPasargadApp()

{

    // TODO: add construction code here,

    // Place all significant initialization in InitInstance

}



/////////////////////////////////////////////////////////////////////////////

// The one and only CPasargadApp object



CPasargadApp theApp;



using namespace std;

MT4_EXPFUNC int request (char* hostname, char* api, char* parameters, string& message)

{

    WSADATA    WsaData;

    WSAStartup (0x0101, &WsaData);



    sockaddr_in       sin;

    int sock = socket (AF_INET, SOCK_STREAM, 0);

    if (sock == -1) {

        return -100;

    }

    sin.sin_family = AF_INET;

    sin.sin_port = htons( (unsigned short)80);



    struct hostent * host_addr = gethostbyname(hostname);

    if(host_addr==NULL) {

      _DEBUG_PRINT( cout<<"Unable to locate host"<<endl );

      return -103;

    }

    sin.sin_addr.s_addr = *((int*)*host_addr->h_addr_list) ;

    _DEBUG_PRINT( cout<<"Port :"<<sin.sin_port<<", Address : "<< sin.sin_addr.s_addr<<endl);



    if( connect (sock,(const struct sockaddr *)&sin, sizeof(sockaddr_in) ) == -1 ) {

     _DEBUG_PRINT( cout<<"connect failed"<<endl ) ;

     return -101;

    }



 string send_str;



 SEND_RQ("POST ");

 SEND_RQ(api);

 SEND_RQ(" HTTP/1.0\r\n");

 SEND_RQ("Accept: */*\r\n");

 SEND_RQ("User-Agent: Mozilla/4.0\r\n");



 char content_header[100];

 sprintf(content_header,"Content-Length: %d\r\n",strlen(parameters));

 SEND_RQ(content_header);

 SEND_RQ("Accept-Language: en-us\r\n");

 SEND_RQ("Accept-Encoding: gzip, deflate\r\n");

 SEND_RQ("Host: ");

 SEND_RQ("hostname");

 SEND_RQ("\r\n");

 SEND_RQ("Content-Type: application/x-www-form-urlencoded\r\n");

 

 //If you need to send a basic authorization

 //string Auth        = "username:password";

 //Figureout a way to encode test into base64 !

 //string AuthInfo    = base64_encode(reinterpret_cast<const unsigned char*>(Auth.c_str()),Auth.length());

 //string sPassReq    = "Authorization: Basic " + AuthInfo;

 //SEND_RQ(sPassReq.c_str());



 SEND_RQ("\r\n");

 SEND_RQ("\r\n");

 SEND_RQ(parameters);

 SEND_RQ("\r\n");



 _DEBUG_PRINT(cout<<"####HEADER####"<<endl);

 char c1[1];

 int l,line_length;

 bool loop = true;

 bool bHeader = false;



 while(loop) {

   l = recv(sock, c1, 1, 0);

   if(l<0) loop = false;

   if(c1[0]=='\n') {

       if(line_length == 0) loop = false;



       line_length = 0;

       if(message.find("200") != string::npos)

           bHeader = true;



   }

   else if(c1[0]!='\r') line_length++;

   _DEBUG_PRINT( cout<<c1[0]);

   message += c1[0];

 }



 message="";

 if(bHeader) {



     _DEBUG_PRINT( cout<<"####BODY####"<<endl) ;

     char p[1024];

     while((l = recv(sock,p,1023,0)) > 0)  {

         _DEBUG_PRINT( cout.write(p,l)) ;

         p[l] = '\0';

         message += p;

     }



     _DEBUG_PRINT( cout << message.c_str());

 } else {

     return -102;

 }



 WSACleanup( );



 return 0;

}



MT4_EXPFUNC int __stdcall Bamdad(int a, int b) {

    return a+b;

}

bamdad · #2 (**permalink**) 06-04-2007, 09:59 AM

Anyone can Help ?

bamdad · #3 (**permalink**) 06-05-2007, 10:56 AM

one of my friends suggested me to use cURL Library ..
i try to but i couldn't i think i have to write a DLL using cURL to send request with a single function and just use that function in meta ...
any suggestion?

dwmcqueen · #4 (**permalink**) 06-25-2008, 03:03 PM

I just noticed this - you looking for help on this? I have done this with the cURL library.

Mistigri · #5 (**permalink**) 06-25-2008, 04:50 PM

Here is what i use ( Visual Studio 2008 - C++ DLL )

PHP Code:


			
Code:

//---- You need to add these includes at the top of your code

//---- #include <wininet.h>

//---- #include <atlstr.h>



MT4_EXPFUNC int __stdcall Sample( int Whatever )

{

    //---- Declare Return Value

   CHAR buffer[2048] ;

   CString m_strContents;

   DWORD dwRead;



   /* Connect to the internet */

   HINTERNET hiNet = InternetOpen(

                            L"InetURL/1.0",

                            INTERNET_OPEN_TYPE_PRECONFIG,

                            NULL,

                            NULL,

                            0

                           );

   /* if connection fails throw error */

   if( !hiNet ) { return( -1010 ); }

   

   /* Connect to a site */

   HINTERNET hConnection = InternetConnect(

                                    hiNet,

                                    L"www.yoursite.com",

                                    INTERNET_DEFAULT_HTTP_PORT,

                                    NULL,

                                    NULL,

                                    INTERNET_SERVICE_HTTP,

                                    0,

                                    0

                                   );

   /* if connetion to site failed */

   if( !hConnection )

   {

      InternetCloseHandle(hiNet);

      return( -1020 );

   } // COULD NOT CONNECT TO WEBSITE



/* Get Data */

   HINTERNET hData = HttpOpenRequest( hConnection, L"GET", L"/yourpage.php", NULL, NULL, NULL, INTERNET_FLAG_KEEP_CONNECTION, 0 );

   if ( !hData )

   {

      InternetCloseHandle(hConnection);

      InternetCloseHandle(hiNet);

      return( -1030 );                                      // PAGE NOT FOUND

   }



   HttpSendRequest( hData, NULL, 0, NULL, 0);

   bool Done = false;

   while( !Done )

   {

         InternetReadFile( hData, buffer, 255, &dwRead );

         if ( dwRead == 0 )  {  Done = true; }

         buffer[dwRead] = 0;

         m_strContents += buffer;

   }



   //---- Here you can output m_strContents

        MessageBox( 0, m_strContents, L"WebPage OutPut", 0 );



         InternetCloseHandle(hConnection);

         InternetCloseHandle(hiNet);

         InternetCloseHandle(hData);

}

You could use post instead of get and pass variables in your url ...

PHP Code:


			
/* Post Data */

   HINTERNET hData = HttpOpenRequest( hConnection, L"POST", L"/yourpage.php?var1=value1&var2=value2 etc ... ", NULL, NULL, NULL, INTERNET_FLAG_KEEP_CONNECTION, 0 );

Kalenzo · #6 (**permalink**) 06-25-2008, 06:56 PM

Guys, there is much more simple way, you can write your request to file, then throw alert - and in metatrader properties - event tab - choose instead of wav file - your bat file, then construct bat file in the way that will read the requrest from txt file.
Simple and works allways - without any DLL's

mudar · #7 (**permalink**) 03-05-2009, 12:37 PM

Thanks, very useful,

just two question
1. <wininet.h> and <atlstr.h> are the one I am getting on Google or should I search them somewhere else ?

2. What if I need to receive a response from my request ?

Thanks a lot !