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Overview

Since MT4 build 880 was released, it's no longer easy to programmatically fill values in Login dialog.

This library hides the complicated stuff and provides easy to use API to login to any MT4 account from within MQL4 script/expert.

How to use

//+------------------------------------------------------------------+
//|                                                      ProjectName |
//|                                      Copyright 2012, CompanyName |
//|                                       http://www.companyname.net |
//+------------------------------------------------------------------+
#include <mql4-auth.mqh>
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void OnStart()
  {
// Just in case...
   if(loginDialogIsOpen()) closeLoginDialog();

// Let's do it!
   if(auth("ACCOUNT_NUMBER","PASSWORD","SERVER IP/HOSTNAME")) 
     {

      Print("Hooray, I found the login dialog, inserted credentials, now wait until MT4 connects :)");

        } else {

      Print("Sorry, I could not even find the Login dialog... Is your MT4 older than v880 or something?");

     }
  }
//+------------------------------------------------------------------+

Credits

I think I scrapped half of the Internet while researching the topic related to WinAPI and sending keyboard input messages programmatically and I was trying everything I stumbled upon and was closing browser tabs here and there to keep it clean so I lost some helpful resources but the ones that helped me significantly and that I could remember are:

Notes

MT4 release 880 made it extremely hard to programmatically authenticate from MQL4. It was hard before release 880 too, but this time it was even harder. Metatrader team, please don't make our lives so hard, we have more creative stuff to concentrate on. Let's build beautiful solutions, not hackish workarounds.

License

This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means.

In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain. We make this dedication for the benefit of the public at large and to the detriment of our heirs and successors. We intend this dedication to be an overt act of relinquishment in perpetuity of all present and future rights to this software under copyright law.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

For more information, please refer to http://unlicense.org/