A foreign function interface for the CONTROL scripting language of WinCC OA.
It allows direct calls from CONTROL scripts to shared library functions written in C, without having to write a new CONTROL extension.
// register the function with its signature
uint funcId = ffiDeclareFunction("libc.so.6", "time", FFI_LONG, FFI_LONG_PTR);
// call the function
long returnvalue = 0;
long timevalue = 0;
ffiCallFunction(funcId, returnvalue, timevalue);The example.ctl script contains a few examples for Windows and Linux. For a full description of the API, see API.md.
Don't forget to check out the libffi submodule before building CtrlFFI. On Windows, building libffi is quite difficult, so I wrote a script that you have to call before running the Visual Studio build.
There are pre-built binaries for WinCC OA 3.12 in the Releases tab.
Licensed under the MIT License, see the LICENSE file included in the repository.