Discussion of article "Exposing C# code to MQL5 using unmanaged exports" - page 5

[ANG3110]

As far as I understand, the RGiesecke UnmanagedExportLibrary template uses comments like // Code for parsing IL files in some places. Russian-speaking Windows-ers insert there Russian comments like // Size, and that's why his template doesn't work. There are simply no functions in the DLL and that's why error 127 is thrown. It's a pity, for the sake of only this template I don't want to change the Windows interface language, though it works quite well and seems to be correct, at least DLLs are at least unloaded. Microsoft is also a broom, you can easily transfer data from C++ to C#, but the other way round is a big problem.

[Hongming Huo]

I'm on a 64 win 8.

I compiled it with vs2013.

However, it loads, but there is an unresolved import function call.

How can I solve this?

2014.03.05 20:39:59.220 UnmanagedExportsDLLExample1 (XAUUSD,H1) unresolved import function call

2014.03.05 20:39:59.220 UnmanagedExportsDLLExample1 (XAUUSD,H1) Cannot find 'Add' in 'Testme.dll'

[BHC]

2011.10.29 20:13:37    2000.01.03 00:00  Expert_NN_1_1 USDJPY,H1: cannot call function 'sum' from dll 'NN 1 DLL.dll' (error 127)

 

 

 

Hi,

 Am getting similar errors. How did you sort it out?... 

2014.03.28 22:16:41.199 2014.03.25 23:59  unresolved import function call

2014.03.28 22:16:41.199 2014.03.25 23:59  Cannot find 'Set2DArray' in 'Testme.dll' 

[traregs]

ANG3110:
As far as I understand the RGiesecke UnmanagedExportLibrary template...

This message was left over half a year ago. Has anything changed since then????

[TMSxMQL5]

Anybody managed to make ReplaceString function work? all functions are doing there job, except this one, any Ideas?

[kmgog]

Method one:

I have 64 win 7, vs2012 C#. Downloaded the owner's testme.zip template file.

In the middle of the prompt a few errors (wrong path, missing files, etc. and so on and so forth), has been solved.

But in the end, still appear and and upstairs the same problem. I do not know if it is solved now? What method to solve.

Method two:

NuGet installed RGiesecke package.

https://www.nuget.org/packages/UnmanagedExports/1.2.6

The latest version from 201311 prompts

Error 2 C:\Users\Administrator\AppData\Local\Temp\tmp8B24\dllTest.il(58) : error : syntax error at token '{ ' in: {
dllTest

[[Deleted]]

You can use C++ stripper with the help of IJW, and then merge everything into one single DLL purely by means of compiler - linker, perversions with the template described in the article are not necessary, described briefly here - http://stackoverflow.com/questions/26226958/include-managed-c-sharp-dll-into-unmanaged-c-dll-all-in-one-single-file.

Well, and the described method with the template RGiesecke - it is a hack and such sooner or later stops working, I, by the way, also did not work ...

But if someone still wants to play with IL method described in the article, there is one more bike, but it doesn't work either - https://github.com/winch/winch.pinkbile.com-c-sharp/tree/master/dll_tool/dll_tool.

[Adrian Emanuel Preoteasa]

Hello,

Was anybody able to send a structure with string variables inside, to the dll?

I was able to send int, double, float, but for string variables i get this error:

Access violation read to 0x0000007B

Here is my C# structure:

        [StructLayout(LayoutKind.Sequential, Pack = 1)]
        public struct accInfo
        {
            public string broker;
//            public String server;
            public int account;
//            public String user;

            public double balance;
            public Double credit;
//            public String currency;
            public int leverage;
            public int stopout;
            public int stopoutmode;
            public float commission;
            public int lotsize;
            public float minlot;
            public float lotstep;
            public float maxlot;
            public float gmtOffset;

//            public String pair;
            public int digits;
            public int point;
            public int tradeAllowed;
            public int swaptype;
            public float swapbuy;
            public float swapsell;
            public int stoplevel;
        };

And here its the mql4 structure:

   struct accInfo
   {
      string   broker;
//      string   server;
      int      account;
//      string   user;
      
      double   balance;
      double   credit;
//      string   currency;
      int      leverage;
      int      stopout;
      int      stopoutmode;
      float    commission;
      int      lotsize;
      float    minlot;
      float    lotstep;
      float    maxlot;
      float    gmtOffset;
      
//      string   pair;
      int      digits;
      int      point;
      int      tradeAllowed;
      int      swaptype;
      float    swapbuy;
      float    swapsell;
      int      stoplevel;
   };

I have tryed to marshal the string variable inside the structure but MT4 crashes totaly, no error just hangs and crushes in windows.

       [StructLayout(LayoutKind.Sequential, Pack = 1)]
        public struct accInfo
        {
            [MarshalAs(UnmanagedType.LPWStr)]
            public string broker;
...

Thank you.

[Viktar Dzemikhau]

Renat Fatkhullin:

Yes, in some time we will write a new article about using DLLs. A lot of interesting things have been added there.

In the meantime, you can use the examples from the article under discussion. There is nothing complicated there.

And ... How long to wait? A year, two... or 10?

It's been 3 years already. According to the article mentioned in the very beginning it is not possible to import methods from dll. Where are the examples?

[jseppa]

Thank you very much for this article. I've used the ideas here to build this opensource MQL library for C#.

https://github.com/jseparovic/MQL4CSharp

It's still under development and is untested at present, but initial tests show the idea works.

It's very basic in how it sends commands from C#, using a Thread for the C# code to run in, and getters/setters for communication. MQL polls for waiting commands every millisecond, while the C# code can block until the result is written.

Take a look at https://github.com/jseparovic/MQL4CSharp/blob/master/MQL4CSharp/UserDefined/Strategy/MaCrossStrategy.cs for an example of how to implement a strategy in c#.

Cheers,

Jason