: Replace slow functions in Python or C# with high-performance Rust logic.

: Ensures the function uses the standard "C" calling convention, which is the universal language of software. 4. Compiling the DLL

To make a function visible to the outside world, you need three key ingredients: pub , extern "C" , and #[no_mangle] .

Note: Always use cdylib over dylib for C-compatibility to keep the file size smaller and avoid Rust-specific linking issues. 3. Writing the Code ( src/lib.rs )

#[no_mangle] pub extern "C" fn hello_from_rust() { println!("Hello from rust_pub.dll!"); } #[no_mangle] pub extern "C" fn add_numbers(a: i32, b: i32) -> i32 { a + b } Use code with caution. Copied to clipboard

For advanced Windows API integration, check the official Microsoft documentation on calling conventions .

: Prevents the Rust compiler from changing the function name into a unique hash, allowing external programs to find add_numbers by its name.