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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! { HGLOBAL;
/// Handle to a
/// [global memory block](https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-globalalloc).
/// Originally just a `HANDLE`.
///
/// The allocated memory block is accessible through the
/// [`GlobalLock`](crate::prelude::kernel_Hglobal::GlobalLock) method.
}
impl kernel_Hglobal for HGLOBAL {}
/// This trait is enabled with the `kernel` feature, and provides methods for
/// [`HGLOBAL`](crate::HGLOBAL).
///
/// Prefer importing this trait through the prelude:
///
/// ```no_run
/// use winsafe::prelude::*;
/// ```
pub trait kernel_Hglobal: Handle {
/// [`GlobalAlloc`](https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-globalalloc)
/// function.
#[must_use]
fn GlobalAlloc(
flags: Option<co::GMEM>,
num_bytes: usize,
) -> SysResult<GlobalFreeGuard>
{
unsafe {
ptr_to_sysresult_handle(
ffi::GlobalAlloc(flags.unwrap_or_default().raw(), num_bytes),
).map(|h| GlobalFreeGuard::new(h))
}
}
/// [`GlobalFlags`](https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-globalflags)
/// function.
#[must_use]
fn GlobalFlags(&self) -> SysResult<co::GMEM> {
match unsafe { ffi::GlobalFlags(self.ptr()) } {
GMEM_INVALID_HANDLE => Err(GetLastError()),
flags => Ok(unsafe { co::GMEM::from_raw(flags) }),
}
}
/// [`GlobalLock`](https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-globallock)
/// function.
///
/// Calls [`GlobalSize`](crate::prelude::kernel_Hglobal::GlobalSize) to
/// retrieve the size of the memory block.
///
/// # Examples
///
/// ```no_run
/// use winsafe::{self as w, prelude::*, co};
///
/// let hglobal = w::HGLOBAL::GlobalAlloc(
/// Some(co::GMEM::FIXED | co::GMEM::ZEROINIT),
/// 120,
/// )?;
///
/// let mut block = hglobal.GlobalLock()?;
///
/// block.as_mut_slice()[0] = 40;
///
/// // GlobalUnlock() called automatically
///
/// // GlobalFree() called automatically
/// # w::SysResult::Ok(())
/// ```
#[must_use]
fn GlobalLock(&self) -> SysResult<GlobalUnlockGuard<'_, Self>> {
let mem_sz = self.GlobalSize()?;
unsafe {
ptr_to_sysresult(ffi::GlobalLock(self.ptr()))
.map(|ptr| GlobalUnlockGuard::new(self, ptr, mem_sz),
)
}
}
/// [`GlobalReAlloc`](https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-globalrealloc)
/// function.
///
/// Originally this method returns the handle to the reallocated memory
/// object; here the original handle is automatically updated.
fn GlobalReAlloc(&mut self,
num_bytes: usize,
flags: Option<co::GMEM>,
) -> SysResult<()>
{
ptr_to_sysresult_handle(
unsafe {
ffi::GlobalReAlloc(
self.ptr(),
num_bytes,
flags.unwrap_or_default().raw(),
)
},
).map(|h| { *self = h; })
}
/// [`GlobalSize`](https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-globalsize)
/// function.
#[must_use]
fn GlobalSize(&self) -> SysResult<usize> {
match unsafe { ffi::GlobalSize(self.ptr()) } {
0 => Err(GetLastError()),
sz => Ok(sz),
}
}
}