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ForeignFunctionLoad—Wolfram Documentation

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ForeignFunctionLoad[lib,fun,{argtype₁,argtype₂,…}rettype]

loads the function fun with the specified argument and output types from the library lib.

ForeignFunctionLoad[ptr,{argtype₁,argtype₂,…}rettype]

creates a foreign function from the function pointer ptr.

• ForeignFunctionLoad returns the ForeignFunction object.
• lib is resolved with FindLibrary.
• lib must be a C-compatible dynamic library.
• Supported types generally align with those supported by the Wolfram Compiler.
• Possible argument and return types and their corresponding C types include:
• "UnsignedInteger8" uint8_t unsigned 8-bit integer "Integer8" int8_t signed 8-bit integer "UnsignedInteger16" uint16_t unsigned 16-bit integer "Integer16" int16_t signed 16-bit integer "UnsignedInteger32" uint32_t unsigned 32-bit integer "Integer32" int32_t signed 32-bit integer "UnsignedInteger64" uint64_t unsigned 64-bit integer "Integer64" int64_t signed 64-bit integer "CUnsignedChar" unsigned char C-compatible unsigned char "CSignedChar" signed char C-compatible signed char "CUnsignedShort" unsigned short C-compatible unsigned short "CShort" short C-compatible short "CUnsignedInt" unsigned int C-compatible unsigned int "CInt" int C-compatible int "CUnsignedLong" unsigned long C-compatible unsigned long "CLong" long C-compatible long "CSizeT" size_t C-compatible size_t "CFloat" float C-compatible float "CDouble" double C-compatible double "OpaqueRawPointer" void* opaque pointer "RawPointer"::[t] t* typed pointer {ty₁,ty₂,…} struct {ty₁ f₁; ty₂ f₂; …} struct or product type "Void" void no output (only in output types)
• Struct or product types can also be written as "ListTuple"::[ty₁,ty₂, …].
• In ForeignFunctionLoad[ptr,…], ptr must be an OpaqueRawPointer pointing to a valid function in a library.

Load a function from a library:

Call the function:

Create a foreign function for the RAND_bytes function from OpenSSL:

Create a buffer into which the random bytes can be written:

Generate the random bytes by calling RAND_bytes:

Read the output:

Package into a function:

The foreign function is very efficient:

Implement SHA256 using OpenSSL:

Create a buffer containing the plaintext to hash:

Create a buffer into which to write the hash:

Execute the hash:

Read the results from the ciphertext buffer:

Compare with the built-in function Hash:

Package into a function:

The packaged function is very efficient:

ForeignFunctionLoad can generally create callable links to libraries faster than custom links can be compiled:

However, the custom compiled versions can have less overhead:

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