I download some mexw64. type files with some Matlab .m files. I want to ask how can I open them and investigate the code and algorithm through them?
Is it possible to convert them to the .m file?
(the windows in my laptop is 64 bit)
Unfortunately not, unless you can contact the author of the MEX file.
MEX files are Matlab executable files. A MEX file is first written in C/C++/Fortran, and then compiled to a binary file with extension .mexw64 (Windows), .mexmaci64 (MacOS), or .mexa64 (Linux). The extension is chosen by the author, based on whether he/she intends the file to be used on Windows, Mac, or Linux.
See the documentation for more information, and the Matlab Q&A site for possible indirect solutions.
Related
I've downloaded a file (ListFunc.mexw64) containing some functions I'd like to use in my algorithm. I am using Mac OS but, it seems incompatible with OS as well as the MATLAB software itself.
Is there a way to get it to work or to see the content of the file?
A mexw64 file is compiled for Win64 systems, the equivalent extension for macOS is mexmaci64 - this file simply wasn't meant to be used on a macOS.
You should try to contact the authors of the file and ask them to recompile it for Mac, or ask for the source code and compile it yourself, according to these instructions.
I am trying to execute some example code from a MATLAB toolkit, 'oscmex'. This toolkit allows for communication using the OSC protocol over MATLAB. I presume this question is non-specific; it should apply to any toolkit that is set-up in the manner that this one is.
Reasons aside, I'm having some simple trouble getting the toolkit up and running. The toolkit comes with no documentation whatsoever; just a set of six DLL files (in one directory), and a set of four MATLAB '.m' example code files (in another directory). Every toolkit I've used in the past has either been a built-in kit or has had an intuitive (semi-automated) install procedure.
After downloading the toolkit, the first thing I tried was to simply run one of the '.M' example codes. This failed as the first line of the code contained the function osc(), which is not (currently) recognised by MATLAB.
So, I figured maybe I need to move the '.M' files into the same folder as the DLLs; perhaps MATLAB would see the functions inside the DLLs. No dice.
So, I realise that I have to somehow link MATLAB to the DLLs on startup. I tried adding the DLLs to a folder and adding an entry to that in the 'pathdef.m' file. This also failed.
I've read somewhere I can load a DLL file by using the loadlibrary() function. So, I tried doing this for the DLL files. This failed on the first file:
>> loadlibrary('osc_free_address.dll')
Error using loadlibrary>lFullPath (line 587)
Could not find file osc_free_address.h.
I'm starting to run out of options... How can I get this set of DLLs up and running?
Browsing this library's web page it would seems these DLLs are just old form of mex files.
Therefore, they should not be used in the context of shared library (e.g., using loadlibrary and calllib), but rather compiled directly to mex files.
To do so, I would suggest the following steps:
Make sure you have a working mex compiler configured for your Matlab.
In matlab, type:
>> mex -setup
this will guide you through the configuration process. I understand that you are working on a windows machine, I usually work with visual studio compiler - works best for me.
This library's README file suggests that OSC
requires liblo 0.22 or later. See http://plugin.org.uk/liblo/
Make sure you have this library and it is located in you LD_LIBRARY_PATH (see e.g., this question for details, or the mex docs).
Get the source code for OSC library from their repository.
Compile the sources in matlab using
>> mex -O -largeArrayDims osc_free_address.c
>> mex -O -largeArrayDims osc_free_server.c
and so on for all 7 c source files. After mex-ing the c files you'll have mex files that you can run from Matlab as if they were regular functions.
You may find it useful to use the library's make file, as suggested by Andrew Mao.
Good luck,
If you look at the build for that software, it is compiling mex files, not DLLs (shared libraries): http://sourceforge.net/p/oscmex/code/4/tree/trunk/src/osc_make.m.
I would try using the mex commands instead of the dll commands (perhaps the files are just misnamed.) Even better, I would compile the files yourself with mex using the build file in source.
Note that the instructions also say that you need liblo-0.22 in order to run the library, so make sure you have that accessible as well.
I took a look at your OSC Toolkit. It seems they have been compiled by MATLAB mex. But, it is not mentioned for which kind of architecture they have been built. You can type mexext at MATLAB command prompt to find the extension for your MATLAB mex files. Then, change the DLL extensions to the given extension. If the original mex is compatible with your matlab, the DLL can be easily accessed by MATLAB. Just make sure to add the folder to your MATLAB path.
Try changing the extension from .dll to .mexw32 (in win32), or .wexw64 (in win64). It's a long shot but it might work.
The Shared Libraries cannot be used directly. As you have mentioned, you need to load them into MATLAB using loadlibrary. According to the documentation, loadlibrary takes two arguments (at least). The first argument is the name of the file, and the second one is the header file which contains definition of functions and external variables. If you do not provide the header file, the MATLAB looks for the a file with the same name as the DLL. Having said that, you need to have access to the header file or at least if you know how the function looks like, you need to write a header for the DLL.
I have worked with the DLLs in MATLAB. The MATLAB is not very user-friendly as long as DLL is concerned. Especially, if the DLL is written in a language other than C (or C++) you will have trouble loading the function into MATLAB.
Besides, MATLAB can only support some specific DLLs. Based, on your version of MATLAB, you need to find out whether or not the shared library is supported by MATLAB. Have a look at Here
In a nutshell, it is not easy to load a DLL into MATLAB. You need to have some information from DLL.
This question is related to another question I asked here:
Error reading image using jpeg_read from Matlab's jpeg toolbox
I've been trying to compile the jpeg toolbox under Windows 7 (using the commands Shai provided in the answer to the question I posted), but I get the following error:
jpeg_read.c(52) : fatal error C1083: Cannot open include file: 'jerror.h': No such file or directory
which I believe happened because I haven't built libjpeg. I tried to build libjpeg6b like jpegtoolbox's README says, but I couldn't find a clear guide on how to do it on Windows with visual studio 2010 (and libjpeg's install document doesn't help much), so I ended building libjpeg8d.
My question is if there's any way to use libjpeg8d to compile the jpeg toolbox. I've tried running the command:
mex -I<IJGPATH> jpeg_read.c <LIBJPEG>
with IJGPATH being my libjpeg8d installation folder and LIBJPEG being the path to the jpeg.lib file, inside IJGPATH/Release, but I still get the same missing jerror.h error as before.
Thanks in advance.
Jpeg toolbox contains Matlab routines for manipulating JPEG files. While Matlab's built-in IMREAD and IMWRITE functions provide basic conversion between JPEG files and image arrays, they do not provide access to the details of the JPEG image, such as the JPEG coefficients or the quantization tables.
The routines in this package provide additional functionality for directly accessing the contents of JPEG files from Matlab, including the Discrete Cosine Transform (DCT) coefficients, quantization tables, Huffman coding tables, color space information, and comment markers. The toolbox can be added to Matlab to use the functions.
First check whether the following are installed in your system.
1.Microsoft windows sdk7
2.Microsoft visual c++ 2010 express
if they are not installed, Download and install them in the order specified.
Note: Before installing windows sdk, uninstall any redistributalbe packages of visual c++ 2010. Else windows sdk produces problem during installation and the install fails. During installation dont forget to check the 'x64 Libraries' for 64bit OS and 'x86 Libraries' for 32bit OS, under Windows Headers and Libraries. This allows to use compiler tools for 64 bit operating systems. Once it overs, install visual c++. These tools are free and available at microsoft website. Both online and offline installers are available.
Now comes the real integration process
Step 1: Download the jpeg toolbox and extract it to a separate folder (eg. jpeg)
Download jpeg toolbox
Step 2: Download jpeg source files and extract it to a separate folder (eg.jpegsrc). In the folder jpeg-6b which is in jpegsrc, rename jconfig.vc to jconfig.h and makefile.vc to makefile
Download jpegsrc file
Step 3: From start->All programs-> Microsoft windows sdk , open the command prompt. This opens the 'windows x64 debug environment'. Navigate to the jpeg-6b folder which is inside the jpegsrc folder which is extracted at step 2. Run the command 'nmake clean all' without quotes. This creates the libjpeg.lib file in the same folder.
Step 4: Now open the matlab and choose the workfolder as jpeg, created in step 1.
Now in the command windows run the following commands,
mex -I jpeg_read.c
mex -I jpeg_write.c
Replace with the path to the IJG jpeg-6b directory created in step 2, and
with the full path to the IJG code library file (libjpeg.lib).
To use the jpeg_read and jpeg_write functions copy jpeg_read.mexw64 and jpeg_write.mexw64 files created above to your work directory. Dont uninstall visual c++ compiler or it wont work.
If you are trying to work in Windows, you need to rename jerror.vc to jerror.h
Also, when you mex the files, you need to edit the jpeg_read.c and jpeg_write.c from include to include "jerror.h"
I have a folder that implements the Shape Context descriptor, and it contains .m files and .cpp files. When some .m file calls a .cpp file, MATLAB yields: ??? Undefined function or method ‹The functions' name› for input arguments of type ‹double›. although I have everything in path.
Am I need to install something special in order to make MATLAB recognize this file?
-Thanks
I found a solution.
When running on a 64-bit operating system the matlab couldn't read the .dll files.
I entered mex FileName.cpp for all my .cpp file and it created .mexw64 files that solved the problem.
Thanks everyone again.
Look at this manual: Create C/C++ and Fortran MEX-Files
I have dowloaded libsvm from http://www.csie.ntu.edu.tw/~cjlin/libsvm/
I unziped and copied the libsvm folder to c:..../documents/MATLAB folder. includedmex.h to all C files. Inside libsvm-> I have different folders. also in that Matlab folder I have files like libsvmread.c , libsvmwrite.c , makefile, make.m, svmtrain ,svmpredict etc...
how I can use these files in matlab? Can any one help me to create .mex files for these files.
I read and tried many times ..it is not working correctly for me. I need to do svmensemble creation in matlab.can anyone help me ASAP.
Have a look at the README file:
Installation and Data Format
On Unix systems, type make' to build thesvm-train' and
`svm-predict' programs. Run them without arguments to show the usages
of them.
On other systems, consult Makefile' to build them (e.g., see
'Building Windows binaries' in this file) or use the pre-built
binaries (Windows binaries are in the directorywindows').
For more information, tell us which operating system you are using.
you need to do mex -setup to configure the compiler.After which, you run the make.m file in the matlab folder.. Please read the README file.. the details are there...