rust/src/libstd/sys/windows/dynamic_lib.rs
2018-12-25 21:08:33 -07:00

44 lines
1.1 KiB
Rust

use os::windows::prelude::*;
use ffi::{CString, OsStr};
use io;
use sys::c;
pub struct DynamicLibrary {
handle: c::HMODULE,
}
impl DynamicLibrary {
pub fn open(filename: &str) -> io::Result<DynamicLibrary> {
let filename = OsStr::new(filename)
.encode_wide()
.chain(Some(0))
.collect::<Vec<_>>();
let result = unsafe {
c::LoadLibraryW(filename.as_ptr())
};
if result.is_null() {
Err(io::Error::last_os_error())
} else {
Ok(DynamicLibrary { handle: result })
}
}
pub fn symbol(&self, symbol: &str) -> io::Result<usize> {
let symbol = CString::new(symbol)?;
unsafe {
match c::GetProcAddress(self.handle, symbol.as_ptr()) as usize {
0 => Err(io::Error::last_os_error()),
n => Ok(n),
}
}
}
}
impl Drop for DynamicLibrary {
fn drop(&mut self) {
unsafe {
c::FreeLibrary(self.handle);
}
}
}