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#![allow(non_camel_case_types, non_snake_case)]
use crate::co;
use crate::decl::*;
use crate::guard::*;
use crate::kernel::{ffi, privs::*};
use crate::prelude::*;
impl_handle! { HLOCAL;
/// Handle to a
/// [local memory block](https://learn.microsoft.com/en-us/windows/win32/winprog/windows-data-types#hlocal).
///
/// The allocated memory block is accessible through the
/// [`LocalLock`](crate::prelude::kernel_Hlocal::LocalLock) method.
}
impl kernel_Hlocal for HLOCAL {}
/// This trait is enabled with the `kernel` feature, and provides methods for
/// [`HLOCAL`](crate::HLOCAL).
///
/// Prefer importing this trait through the prelude:
///
/// ```no_run
/// use winsafe::prelude::*;
/// ```
pub trait kernel_Hlocal: Handle {
/// [`LocalAlloc`](https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-localalloc)
/// function.
#[must_use]
fn LocalAlloc(
flags: Option<co::LMEM>,
num_bytes: usize,
) -> SysResult<LocalFreeGuard>
{
unsafe {
ptr_to_sysresult_handle(
ffi::LocalAlloc(flags.unwrap_or_default().raw(), num_bytes),
).map(|h| LocalFreeGuard::new(h))
}
}
/// [`LocalFlags`](https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-localflags)
/// function.
#[must_use]
fn LocalFlags(&self) -> SysResult<co::LMEM> {
match unsafe { ffi::LocalFlags(self.ptr()) } {
LMEM_INVALID_HANDLE => Err(GetLastError()),
flags => Ok(unsafe { co::LMEM::from_raw(flags) }),
}
}
/// [`LocalLock`](https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-locallock)
/// function.
///
/// Calls [`LocalSize`](crate::prelude::kernel_Hlocal::LocalSize) to
/// retrieve the size of the memory block.
///
/// # Examples
///
/// ```no_run
/// use winsafe::{self as w, prelude::*, co};
///
/// let hlocal = w::HLOCAL::LocalAlloc(
/// Some(co::LMEM::FIXED | co::LMEM::ZEROINIT),
/// 120,
/// )?;
///
/// let mut block = hlocal.LocalLock()?;
///
/// block.as_mut_slice()[0] = 40;
///
/// // LocalUnlock() called automatically
///
/// // LocalFree() called automatically
/// # w::SysResult::Ok(())
/// ```
#[must_use]
fn LocalLock(&self) -> SysResult<LocalUnlockGuard<'_, Self>> {
let mem_sz = self.LocalSize()?;
unsafe {
ptr_to_sysresult(ffi::LocalLock(self.ptr()))
.map(|ptr| LocalUnlockGuard::new(self, ptr, mem_sz))
}
}
/// [`LocalReAlloc`](https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-localrealloc)
/// function.
///
/// Originally this method returns the handle to the reallocated memory
/// object; here the original handle is automatically updated.
fn LocalReAlloc(&mut self,
num_bytes: usize,
flags: Option<co::LMEM>,
) -> SysResult<()>
{
ptr_to_sysresult_handle(
unsafe {
ffi::LocalReAlloc(
self.ptr(),
num_bytes,
flags.unwrap_or_default().raw(),
)
},
).map(|h| { *self = h; })
}
/// [`LocalSize`](https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-localsize)
/// function.
#[must_use]
fn LocalSize(&self) -> SysResult<usize> {
match unsafe { ffi::LocalSize(self.ptr()) } {
0 => Err(GetLastError()),
sz => Ok(sz),
}
}
}