SetPriorityClass

// KERNEL32.dll
#include <windows.h>

BOOL SetPriorityClass(
    HANDLE hProcess,
    PROCESS_CREATION_FLAGS dwPriorityClass
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SetPriorityClass(
    hProcess As IntPtr,   ' HANDLE
    dwPriorityClass As UInteger   ' PROCESS_CREATION_FLAGS
) As Boolean
End Function

' hProcess : HANDLE
' dwPriorityClass : PROCESS_CREATION_FLAGS
Declare PtrSafe Function SetPriorityClass Lib "kernel32" ( _
    ByVal hProcess As LongPtr, _
    ByVal dwPriorityClass As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SetPriorityClass = ctypes.windll.kernel32.SetPriorityClass
SetPriorityClass.restype = wintypes.BOOL
SetPriorityClass.argtypes = [
    wintypes.HANDLE,  # hProcess : HANDLE
    wintypes.DWORD,  # dwPriorityClass : PROCESS_CREATION_FLAGS
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
SetPriorityClass = Fiddle::Function.new(
  lib['SetPriorityClass'],
  [
    Fiddle::TYPE_VOIDP,  # hProcess : HANDLE
    -Fiddle::TYPE_INT,  # dwPriorityClass : PROCESS_CREATION_FLAGS
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn SetPriorityClass(
        hProcess: *mut core::ffi::c_void,  // HANDLE
        dwPriorityClass: u32  // PROCESS_CREATION_FLAGS
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern bool SetPriorityClass(IntPtr hProcess, uint dwPriorityClass);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_SetPriorityClass' -Namespace Win32 -PassThru
# $api::SetPriorityClass(hProcess, dwPriorityClass)

#uselib "KERNEL32.dll"
#func global SetPriorityClass "SetPriorityClass" sptr, sptr
; SetPriorityClass hProcess, dwPriorityClass   ; 戻り値は stat
; hProcess : HANDLE -> "sptr"
; dwPriorityClass : PROCESS_CREATION_FLAGS -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

#uselib "KERNEL32.dll"
#cfunc global SetPriorityClass "SetPriorityClass" sptr, int
; res = SetPriorityClass(hProcess, dwPriorityClass)
; hProcess : HANDLE -> "sptr"
; dwPriorityClass : PROCESS_CREATION_FLAGS -> "int"

; BOOL SetPriorityClass(HANDLE hProcess, PROCESS_CREATION_FLAGS dwPriorityClass)
#uselib "KERNEL32.dll"
#cfunc global SetPriorityClass "SetPriorityClass" intptr, int
; res = SetPriorityClass(hProcess, dwPriorityClass)
; hProcess : HANDLE -> "intptr"
; dwPriorityClass : PROCESS_CREATION_FLAGS -> "int"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procSetPriorityClass = kernel32.NewProc("SetPriorityClass")
)

// hProcess (HANDLE), dwPriorityClass (PROCESS_CREATION_FLAGS)
r1, _, err := procSetPriorityClass.Call(
	uintptr(hProcess),
	uintptr(dwPriorityClass),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SetPriorityClass(
  hProcess: THandle;   // HANDLE
  dwPriorityClass: DWORD   // PROCESS_CREATION_FLAGS
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'SetPriorityClass';

result := DllCall("KERNEL32\SetPriorityClass"
    , "Ptr", hProcess   ; HANDLE
    , "UInt", dwPriorityClass   ; PROCESS_CREATION_FLAGS
    , "Int")   ; return: BOOL

●SetPriorityClass(hProcess, dwPriorityClass) = DLL("KERNEL32.dll", "bool SetPriorityClass(void*, dword)")
# 呼び出し: SetPriorityClass(hProcess, dwPriorityClass)
# hProcess : HANDLE -> "void*"
# dwPriorityClass : PROCESS_CREATION_FLAGS -> "dword"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。