Generate a C++ MATLAB Data API Shared Library and Build a C++ Application
Supported platform: Windows®, Linux®, Mac
This example shows how to create a C++ shared library from a MATLAB® function. You can integrate the generated library into a C++ application. This example also shows how to call the C++ shared library from a C++ application. The target system does not require a licensed copy of MATLAB to run the application.
Create Functions in MATLAB
In MATLAB, examine the MATLAB code that you want packaged. For this example, open
addmatrix.m located in
At the MATLAB command prompt, enter:
addmatrix([1 4 7; 2 5 8; 3 6 9], [1 4 7; 2 5 8; 3 6 9])
The output is:
ans = 2 8 14 4 10 16 6 12 18
Create a C++ Shared Library Using Library Compiler App
On the MATLAB Apps tab, on the far right of the Apps section, click the arrow. In Application Deployment, click Library Compiler.
Alternatively, you can open the Library Compiler app from the MATLAB command prompt by entering:
In the Type section of the toolstrip, click C++ Shared Library.
In the Library Compiler app project window, specify the files of the MATLAB application that you want to deploy.
In the Exported Functions section of the toolstrip, click .
In the Add Files window, browse to the example folder, and select the function you want to package. Click Open.
The function is added to the list of exported function files. Repeat this step to package multiple files in the same application.
For this example, navigate to
In the Packaging Options section of the toolstrip, decide whether to include the MATLAB Runtime installer in the generated application by selecting one of the options:
Runtime downloaded from web — Generate an installer that downloads the MATLAB Runtime and installs it along with the deployed MATLAB application. You can specify the file name of the installer.
Runtime included in package — Generate an application that includes the MATLAB Runtime installer. You can specify the file name of the installer.
The first time you select this option, you are prompted to download the MATLAB Runtime installer.
Specify Shared Library Settings
The Library Name field is automatically populated with
addmatrixas the name of the packaged shared library. Rename it as
libmatrix. The same name is followed through in the implementation of the shared library.
In the Samples section, select Create New Sample, and click
In the MATLAB file that opens, edit the code to initialize
a1to a nonzero value:
a1 = [1 4 7; 2 5 8; 3 6 9]; % Initialize a1 here a2 = a1; % Initialize a2 here a = addmatrix(a1, a2);
Save the file and return to the Library Compiler app. For more information and limitations, see Sample Driver File Creation.
Select the type of API for the generated C++ shared libraries. In the API selection section at the bottom, select Create interface that uses the MATLAB Data API. For more information, see API Selection for C++ Shared Library.
Customize the Application and Its Appearance
In the Library Compiler app, you can customize the installer, customize your application, and add more information about the application.
Library information — Information about the deployed application. You can also customize the appearance of the application by changing the application icon and splash screen. The generated installer uses this information to populate the installed application metadata. See Customize the Installer.
Additional installer options — Default installation path for the generated installer and custom logo selection. See Change the Installation Path.
Files required for your library to run — Additional files required by the generated application to run. These files are included in the generated application installer. See Manage Required Files in Compiler Project.
Files installed for your end user — Files that are installed with your application.
Package the Application
When you are finished selecting your packaging options, save your Library Compiler project and generate the packaged application.
In the Save Project dialog box, specify the location to save the project.
In the Package dialog box, verify that Open output folder when process completes is selected.
When the packaging process is complete, examine the generated output in the target folder.
Three folders are generated:
For more information about the files generated in these folders, see Files Generated After Packaging MATLAB Functions.
The log file
PackagingLog.htmlcontains packaging results.
Create a C++ Shared Library Using
If you have already created a C++ shared library using the Library Compiler app, you can skip this section. However, if you want to know how to create a C++ shared library from the MATLAB command window using a programmatic approach, follow these instructions.
Save the path to the
addmatrix.mfile located in
appFile = fullfile(matlabroot,'extern','examples','compilersdk','c_cpp','matrix','addmatrix.m');
Save the following code in a sample file named
a1 = [1 4 7; 2 5 8; 3 6 9]; a2 = a1; a = addmatrix(a1, a2);
Additional options can be specified in the
compiler.buildcommand by using one or more of the following name-value arguments.
'AdditionalFiles'— Path to additional files to include in the shared library.
'AutoDetectDataFiles'— Flag to automatically include data files.
'DebugBuild'— Flag to enable debug symbols.
'Interface'— Interface API, specified as
'mwarray'. For more information, see API Selection for C++ Shared Library.
'LibraryName'— Name of the generated library.
'OutputDir'— Path to the output directory that contains generated files.
'SampleGenerationFiles'— MATLAB sample files used to generate sample C++ library files. For more information, see Sample Driver File Creation.
'Verbose'— Flag to display progress information indicating compiler output during the build process.
Build the C++ shared library using the
compiler.build.cppSharedLibraryfunction. Use name-value arguments to add a sample file and specify the library name.
buildResults = compiler.build.cppSharedLibrary(appFile,... 'LibraryName','libmatrix',... 'SampleGenerationFiles','addmatrixSample1.m');
buildResultscontains information on the build type, generated files, and build options.
This syntax generates the following files within a folder named
libmatrixcppSharedLibraryin your current working directory:
samples\addmatrixSample1_mda.cpp— C++ sample driver file.
v2\generic_interface\libmatrix.ctf— Component technology file that contains the deployable archive.
v2\generic_interface\readme.txt— Text file that contains packaging information.
GettingStarted.html— HTML file that contains information on integrating your shared library.
mccExcludedFiles.log— Log file that contains a list of any toolbox functions that were not included in the application. For information on non-supported functions, see MATLAB Compiler Limitations.
readme.txt— Text file that contains packaging and interface information.
requiredMCRProducts.txt— Text file that contains product IDs of products required by MATLAB Runtime to run the application.
unresolvedSymbols.txt— Text file that contains information on unresolved symbols.
The generated library does not include MATLAB Runtime or an installer. To create an installer using the
Implement the C++ MATLAB Data API Shared Library with a Driver Application
After packaging your C++ shared libraries, you can call them from a C++ application. The C++ application that you create uses the sample C++ driver code generated during packaging. The C++ driver code calls the C++ shared libraries, and it is based on the sample MATLAB file you selected in previous setup steps.
Copy and paste the generated C++ driver code file
samplesfolder into the
v2\generic_interfacefolder created when you created the shared library.
Use the system command line to navigate to the
generic_interfacefolder where you copied the sample C++ driver code file.
Compile and link the application using
mbuildat the system command prompt.
Run the application from the system command prompt.
For information on how to retrieve a struct array, a cell array, or a character
vector from an
feval call, see the files