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03.17.2008 at 05:16AM PDT, ID: 23246717

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8.3

How do I use the Matlab complier correctly?

Zones: MatLab Programming Language, C# Programming Language, Microsoft Visual C#.Net

Tags: C# / Matlab

Hi,

I'm trying to follow this guide http://www.mathworks.com/support/solutions/data/1-X1PFC.html to generate a DLL so that I can access it from a C# application I have written.

When I try and run the example application (from visual studio 2005) I get the error message.

Could not initialize the library. Exception: Unable to find an entry point named
'libtimestwoInitialize' in DLL 'C:\Documents and Settings\Drew\My Documents\MAT
LAB\libtimestwo.dll'.
Press Enter to Finish

I'm not really sure what this means, but it may be something to do with the compiler I'm using, the only options I get when I run mbuild setup are:

>> mbuild -setup
Please choose your compiler for building standalone MATLAB applications:

Would you like mbuild to locate installed compilers [y]/n? y

Select a compiler:
[1] Lcc-win32 C 2.4.1 in C:\PROGRA~1\MATLAB\R2007a\sys\lcc
[2] Microsoft Visual C++ 2005 in C:\Program Files\Microsoft Visual Studio 8
[3] Microsoft Visual C++ 6.0 in C:\Program Files\Microsoft Visual Studio

[0] None

I don't think (correct me if I'm wrong) that any of these are the correct complier. Bearing in mind that this is a C# application what compiler should I be using and how do I get/install it?

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Question Stats

Zone: Programming

Question Asked By: dsmclaughlin

Solution Provided By: itsmeandnobodyelse

Participating Experts: 1

Solution Grade: A

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03.22.2008 at 06:42AM PDT, ID: 21186253

itsmeandnobodyelse:

>>>> Select a compiler:
These are all C++ compilers and as the dll where you want to access fron C# app is a C/C++ dll as well, you actually should select any of them - most probably the newest VC9 (VS 2008) but VC6 and gcc are also valid alternatives for building a dll.

>>>> from visual studio 2005
You have a VC8 (VS2005) as well? You might get some problems building projects at the commandline if you don't properly separate all version of the VC compiler. All these VC installations have a batch command file (VCVars32.bat or similar) which would make a proper environment (PATH, INCLUDE, LIB environment variables) for commandline build. However, you still get a mix if some of the paths defined in that environment were permanently set by means of system settings. So, if you had a 'virgin' developer computer where you installed one and only *one* Visual Studio, you might have less problems...

>>>> Unable to find an entry point named
>>>> 'libtimestwoInitialize' in DLL
That most probably means that the libtimestwo.dll d oesn't fit to the version of MATLAB or to the version of your app (respectively the dll). Check your complete disk for the libtimestwo.dll, If there are more than one file, you actually need to make your PATH pointing to a different location rather than that it is pointing now.

FYI: dlls are 'dynamic loaded libraries' where the functions often were called by name. In the case above the app you started loaded a libtimestwo.dll which it has found either in the current directory where the app resides, in a windows or windows\system directory or in a folder which was defined in the PATH environment variable (open a dos-box and type PATH). There normally were many paths defined and it would take the first of these where the dll could be found. After loading successfully (what seems to have worked) it tries to find the function 'libtimestwoInitialize' as a valid entry point but fails (what most likely means that the developers of the dll changed the name of the initialize function with a new version and the name not found is either the younger or the older name).

03.22.2008 at 06:44AM PDT, ID: 21186262

itsmeandnobodyelse:

>>>> dlls are 'dynamic loaded libraries'
corrected: dynamic link libraries

03.22.2008 at 11:53AM PDT, ID: 21187333

dsmclaughlin:

Hi thanks for your post!

>>>> >>>> Select a compiler:
-ok great! so it doesn't matter which one I choose, that problem is sorted then!

>>>> >>>> from visual studio 2005
>>>> You have a VC8 (VS2005) as well? .......

I only have VS2005, I thought it would be backwards compatible with the code given in th example link I posted. Perhaps it is not? I don't have much experience with VS or DLL's and I don't understand much about the environment that you are talking about. Could you please tell me how to set it up or indeed where I could read up about it?

My machine as only ever had VS2005 on it.

>>>> >>>> Unable to find an entry point named
>>>> >>>> 'libtimestwoInitialize' in DLL
>>>> That most probably means ..... your PATH pointing to a different location rather than that it is pointing now.....

....ok how do I change my Path?

>>>> FYI: dlls are 'dynamic loaded libraries' where the functions often were called by name....... it tries to find the function 'libtimestwoInitialize' as a valid entry point but fails (what most likely means that the developers of the dll changed the name of the initialize function with a new version and the name not found is either the younger or the older name).

so can I do anything about this?

when i type PATH at the VS command prompt i get this:

C:\Program Files\Microsoft Visual Studio 8\VC>PATH
PATH=C:\Program Files\Microsoft Visual Studio 8\Common7\IDE;C:\Program Files\Mic
rosoft Visual Studio 8\VC\BIN;C:\Program Files\Microsoft Visual Studio 8\Common7
\Tools;C:\Program Files\Microsoft Visual Studio 8\Common7\Tools\bin;C:\Program F
iles\Microsoft Visual Studio 8\VC\PlatformSDK\bin;C:\Program Files\Microsoft Vis
ual Studio 8\SDK\v2.0\bin;C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727;C:\Progr
am Files\Microsoft Visual Studio 8\VC\VCPackages;C:\WINDOWS\system32;C:\WINDOWS;
C:\WINDOWS\System32\Wbem;C:\Program Files\QuickTime\QTSystem\;c:\Program Files\M
icrosoft SQL Server\90\Tools\binn\

does that help at all?

Also someone else got me to do a dump of the DLL which resulted in:

C:\Documents and Settings\Drew\My
Documents\MATLAB>dumpbin/exports libtimestwo.dll
Microsoft (R) COFF/PE Dumper Version 8.00.50727.762
Copyright (C) Microsoft Corporation. All rights reserved.

Dump of file libtimestwo.dll

File Type: DLL

Section contains the following exports for libtimestwo.dll

00000000 characteristics
47E28A4D time date stamp Thu Mar 20 16:01:17 2008
0.00 version
1 ordinal base
5 number of functions
5 number of names

ordinal hint RVA name

1 0 000014CF _libtimestwoInitialize =
_libtimestwoInitialize
2 1 00001478 _libtimestwoInitializeWithHandlers
= _libtimestwoInitializeWithHa
ndlers
3 2 000014ED _libtimestwoTerminate =
_libtimestwoTerminate
4 3 00001533 _mlfTimestwo = _mlfTimestwo
5 4 00001504 _mlxTimestwo = _mlxTimestwo

Summary

1000 .bss
1000 .data
1000 .edata
1000 .idata
1000 .rdata
1000 .reloc
1000 .text

I think that shows you what methods are contained in the dll but I'm not sure.

Many thanks again for your help!

03.23.2008 at 04:06AM PDT, ID: 21189217

itsmeandnobodyelse:

>>>> ok how do I change my Path?

At the commandline type

set PATH=new_path_to_folder;%PATH

Note, if the new_path_to_folder has some spaces you need to quote it with "new_path_to_folder". Don't add any spaces around the =.

Or, in system settings\System\Enhanced...\Environment Variables:

If 'Path' is already defined *insert* the new folder. You either can use System or User Settings. Windows will make the PATH from both settings. Make sure that the correct path to libtimestwo.dll was defined prior to that of the wrong path (or remove the wrong path).

03.23.2008 at 04:09AM PDT, ID: 21189221

itsmeandnobodyelse:

>>>> so can I do anything about this?

Yes, you either need to use the libtimestwo.dll which has the correct entry point, *or* you use the MATLAB version which fits to the used libtimestwo.dll.

You can open the libtimestwo.dll in Visual Studio as a binary and search for the entry point. If you found more than one dll I am pretty sure that one will contain the needed entry point.

03.23.2008 at 04:13AM PDT, ID: 21189238

itsmeandnobodyelse:

>>>> PATH=C:\Program Files\Microsoft Visual Studio 8

Your paths were pointing to the installation directory of VS 2005 (== VS8). But I assume that the correct libtimestwo.dll comes with MATLAB. If I am right you had to add the path where the correct libtimestwo.dll resides at the begin of the PATH environment variable so that the right dll was loaded (and not a maybe younger one from VS2005).

Accepted Solution

03.23.2008 at 04:15AM PDT, ID: 21189250

itsmeandnobodyelse:

>>>> 1 0 000014CF _libtimestwoInitialize

That looks good. That is exactly the entry point searched for (the _ prefix was added by the linker). Is there somewhere a second version of that dll?

20080236-EE-VQP-29 / EE_QW_2_20070628