CFFI documentation

C Foreign Function Interface for Python. Interact with almost any C code from Python, based on C-like declarations that you can often copy-paste from header files or documentation.

• Goals
• Comments and bugs
• What’s New
  • v1.15.1
  • v1.15.0
  • v1.14.6
  • v1.14.5
  • v1.14.4
  • v1.14.3
  • v1.14.2
  • v1.14.1
  • v1.14
  • v1.13.2
  • v1.13.1
  • v1.13
  • Older Versions
• Installation and Status
  • Platform-specific instructions
• Overview
  • Main mode of usage
  • Other CFFI modes
  • Embedding
  • What actually happened?
  • ABI versus API
• Using the ffi/lib objects
  • Working with pointers, structures and arrays
  • Python 3 support
  • An example of calling a main-like thing
  • Function calls
  • Variadic function calls
  • Memory pressure (PyPy)
  • Extern “Python” (new-style callbacks)
  • Callbacks (old style)
  • Windows: calling conventions
  • FFI Interface
• CFFI Reference
  • FFI Interface
  • Conversions
• Preparing and Distributing modules
  • ffi/ffibuilder.cdef(): declaring types and functions
  • ffi.dlopen(): loading libraries in ABI mode
  • ffibuilder.set_source(): preparing out-of-line modules
  • Letting the C compiler fill the gaps
  • ffibuilder.compile() etc.: compiling out-of-line modules
  • ffi/ffibuilder.include(): combining multiple CFFI interfaces
  • ffi.cdef() limitations
  • Debugging dlopen’ed C libraries
  • ffi.verify(): in-line API-mode
  • Upgrading from CFFI 0.9 to CFFI 1.0
• Using CFFI for embedding
  • Usage
  • More reading
  • Troubleshooting
  • Issues about using the .so
  • Using multiple CFFI-made DLLs
  • Multithreading
  • Testing
  • Embedding and Extending