vendor/windows-0.48.0/src/imp/delay_load.rs

use super::*;

/// Attempts to load a function from a given library.
///
/// This is a small wrapper around `LoadLibrary` and `GetProcAddress`.
///
/// # Safety
///
/// * Both the library and function names must be valid null-terminated strings.
pub unsafe fn delay_load<T>(library: core::PCSTR, function: core::PCSTR) -> Option<T> {
    let library = LoadLibraryA(library);

    if library == 0 {
        return None;
    }

    let address = GetProcAddress(library, function);

    if !address.is_null() {
        return Some(std::mem::transmute_copy(&address));
    }

    FreeLibrary(library);
    None
}