MATLAB®

Invoking Library Functions

After loading a shared library into the MATLAB^® workspace, use the calllib function to call functions in the library. Specify the library name, function name, and any arguments that get passed to the function:

calllib('libname', 'funcname', arg1, ..., argN)

The following example calls functions from the libmx library to test the value stored in y. To load the library, type:

hfile = [matlabroot '\extern\include\matrix.h'];
loadlibrary('libmx', hfile)

To create a variable y, type:

y = rand(4, 7, 2);

To get information about y, type:

calllib('libmx', 'mxGetNumberOfElements', y)

MATLAB displays:

ans =
    56

Type:

calllib('libmx', 'mxGetClassID', y)

MATLAB displays:

ans =
   mxDOUBLE_CLASS

For information on how to define the argument types, see Passing Arguments.

Getting Information About the Library

Passing Arguments