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DLL imports

  • #1
  • First Post: Aug 2, 2009 6:52pm Aug 2, 2009 6:52pm
Im getting the following error when I try to do a DLL import:
Inserted Code
2009.08.03 00:47:51    dlltest USDCHF,H1: cannot call function 'tibbsNum' from dll 'tibbs.dll' (error 127)
I'm using VC++ 6, here's my DLL code:
Inserted Code
// tibbs.cpp : Defines the entry point for the DLL application.
//

#include "stdafx.h"

#define MT4_EXPFUNC __declspec(dllexport)

BOOL APIENTRY DllMain( HANDLE hModule, 
                       DWORD  ul_reason_for_call, 
                       LPVOID lpReserved
                     )
{
    return TRUE;
}

MT4_EXPFUNC double __stdcall tibbsNum(const double x)
{
    return x*2;
}
(it's just a test function that returns 2X the value passed in)


I placed the DLL file in Crogram Files/ MetaTrader - Alpari UK/ experts / libraries

I managed to get the MessageBox() function to work by importing user32.dll
  • #2
  • Aug 2, 2009 8:44pm Aug 2, 2009 8:44pm
do you have the "Allow DLL imports" enabled on either the indicator or EA whatever you are trying it with??
  • #3
  • Aug 2, 2009 9:44pm Aug 2, 2009 9:44pm
I'm running a 32-bit system with windows XP.

I park my dll in the path: C:\WINDOWS\system32

This works great for me.
  • #4
  • Aug 3, 2009 4:10pm Aug 3, 2009 4:10pm
I tried placing it in System32.. no joy
  • #5
  • Edited Aug 4, 2009 12:28am Aug 3, 2009 8:49pm | Edited Aug 4, 2009 12:28am
FrinkFX,

In your compiled dll solution, do you have a .def file declaring your dll exports?

.def file should look something like:

PHP Code
LIBRARY Your_dll_Name

EXPORTS tibbsNUM
A nice tutorial: http://www.mistigrifx.com/book/coding-dll-mt4

Excerpt from link:

Error 127:
By far the most common error, it is due to the def file. You either do not have a def file, it is not linked properly or the function names in your def file are wrong.
Well checking whether you have a def file or not should be easy, check your project folder and make sure it is there. Then open it and make sure the function name match the ones in your MT4 code.
  • #6
  • Aug 4, 2009 5:40am Aug 4, 2009 5:40am
Quoting wolfe
FrinkFX,

In your compiled dll solution, do you have a .def file declaring your dll exports?

.def file should look something like:

PHP Code
LIBRARY Your_dll_Name

EXPORTS tibbsNUM
A nice tutorial:...

Yes, forgot to mantion, but yes, I have the .def file, placed in the /libraries folder
  • #7
  • Aug 4, 2009 9:34am Aug 4, 2009 9:34am
Since you are using Dev-C++ you're most likely running into a name mangling issue ...

http://www.mistigrifx.com/book/mt4-dll-common-errors

Quote
#ifdef __cplusplus
extern "C" {
#endif

Your code goes here ...

#ifdef __cplusplus
}
#endif
  • #8
  • Aug 4, 2009 1:43pm Aug 4, 2009 1:43pm
Quoting Mistigri
Since you are using Dev-C++ you're most likely running into a name mangling issue ...

http://www.mistigrifx.com/book/mt4-dll-common-errors
that could be it! thanks!
  • #9
  • Aug 4, 2009 3:12pm Aug 4, 2009 3:12pm
no, doesn't work. I'm using Microsoft Visual C+= 6 which is really old (from 1998)

I'll see if I can get VC++ express edition 2005 although I don't really like it

Just to clarify I have tibbs.dll and tibbs.def in my libraries directory.

tibbs.def:
Inserted Code
LIBRARY tibbs.dll
EXPORTS
    tibbsNum
  • #10
  • Last Post: Apr 28, 2019 6:07am Apr 28, 2019 6:07am
Hi Everyone,
I want to change the position of message box. as you know it appears only at center of MT4.
Is there any way to change it's location to top left or bottom left?
Thanks in advance,
for your help
Mohammad
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