Discussion of article "A DLL-free solution to communicate between MetaTrader 5 terminals using Named Pipes" - page 2

[Mohammad Habibzadeh]

angevoyageur:
See http://forum.mql4.com/33307

Thank you for the link.

[StefNRG]

When I´m trying to create the NamePipe in an Expert (in function OnInit() or OnTick()), I get an "Access Violation Error". After debugging they said me, the error is in the function CreateNamedPipeW

If I create the NamePipe in a script, that works correctly.

What is the problem? 

[CrazyCoder]

Hello,

Thanks for your article. I did a similar work on my own EAs. I started to publish post on my blog :http://expertadvisor-blog.com/mirror-ea/

[yalewang]

very very good .

thank you .

[Flying Dutchman]

Hi, is this still a working product? If not, can it be updated to work under the latest MT5 build? Right now it's throwing an 'Access Violation'

[sonaht]

I also faced access violation errors when calling the methods writeTick, readTick... and so on. Find the  fixed CNamedPipes file attached. 

I also added the WriteDouble Method to the CNamedPipe Class:

#import "kernel32.dll"
...
int WriteFile(ulong fileHandle,double &var,int bytes,int &numOfBytes,ulong overlapped);
...
#import

...

bool CNamedPipe::WriteDouble(double data)
  {
   int data_size = sizeof(data);
//--- check parameters
   if(!data || data_size<1) return(false);

//--- send data
   int written;
   if(!WriteFile(hPipe,data,data_size,written,NULL) || written!=data_size)
      return(false);
//--- ok
   return(true);
  }

Side Note: To read/write on Client Side (e.g from another Metatrader Terminal ), I just used the standard MQL5 FilePipe Library. Examples how to use them can be downloaded here: 

https://www.mql5.com/en/articles/503