The Wolfram Language provides a convenient way to call functions in external C and other programs. With a .tm template specifying Wolfram Language functions corresponding to each C function, you build a WSTP-installable binary using mprep or mcc. You can exchange not only C-like data types such as integers, reals, arrays, and strings, but also arbitrary Wolfram Language expressions.

Install — load a WSTP installable executable to call from your Wolfram System session

Uninstall — close down a WSTP executable, removing its Wolfram Language functions

LinkPatterns — find functions available in a running WSTP program

., tm — template file for connecting C and Wolfram Language functions

C Language Functions »

WSMain() — special version of main() for WSTP-installable C programs

WSEvaluate(), WSEvaluateString() — call back from C into the Wolfram Language

WSPutFunction(), WSGetFunction(), ... — exchange arbitrary structures