CLSIDFromString

// OLE32.dll
#include <windows.h>

HRESULT CLSIDFromString(
    LPCWSTR lpsz,
    GUID* pclsid
);

<DllImport("OLE32.dll", ExactSpelling:=True)>
Public Shared Function CLSIDFromString(
    <MarshalAs(UnmanagedType.LPWStr)> lpsz As String,   ' LPCWSTR
    <Out> ByRef pclsid As Guid   ' GUID* out
) As Integer
End Function

' lpsz : LPCWSTR
' pclsid : GUID* out
Declare PtrSafe Function CLSIDFromString Lib "ole32" ( _
    ByVal lpsz As LongPtr, _
    ByVal pclsid As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

CLSIDFromString = ctypes.windll.ole32.CLSIDFromString
CLSIDFromString.restype = ctypes.c_int
CLSIDFromString.argtypes = [
    wintypes.LPCWSTR,  # lpsz : LPCWSTR
    ctypes.c_void_p,  # pclsid : GUID* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLE32.dll')
CLSIDFromString = Fiddle::Function.new(
  lib['CLSIDFromString'],
  [
    Fiddle::TYPE_VOIDP,  # lpsz : LPCWSTR
    Fiddle::TYPE_VOIDP,  # pclsid : GUID* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "ole32")]
extern "system" {
    fn CLSIDFromString(
        lpsz: *const u16,  // LPCWSTR
        pclsid: *mut GUID  // GUID* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLE32.dll")]
public static extern int CLSIDFromString([MarshalAs(UnmanagedType.LPWStr)] string lpsz, out Guid pclsid);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLE32_CLSIDFromString' -Namespace Win32 -PassThru
# $api::CLSIDFromString(lpsz, pclsid)

#uselib "OLE32.dll"
#func global CLSIDFromString "CLSIDFromString" sptr, sptr
; CLSIDFromString lpsz, varptr(pclsid)   ; 戻り値は stat
; lpsz : LPCWSTR -> "sptr"
; pclsid : GUID* out -> "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 "OLE32.dll"
#cfunc global CLSIDFromString "CLSIDFromString" wstr, var
; res = CLSIDFromString(lpsz, pclsid)
; lpsz : LPCWSTR -> "wstr"
; pclsid : GUID* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; HRESULT CLSIDFromString(LPCWSTR lpsz, GUID* pclsid)
#uselib "OLE32.dll"
#cfunc global CLSIDFromString "CLSIDFromString" wstr, var
; res = CLSIDFromString(lpsz, pclsid)
; lpsz : LPCWSTR -> "wstr"
; pclsid : GUID* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	ole32 = windows.NewLazySystemDLL("OLE32.dll")
	procCLSIDFromString = ole32.NewProc("CLSIDFromString")
)

// lpsz (LPCWSTR), pclsid (GUID* out)
r1, _, err := procCLSIDFromString.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpsz))),
	uintptr(pclsid),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function CLSIDFromString(
  lpsz: PWideChar;   // LPCWSTR
  pclsid: PGUID   // GUID* out
): Integer; stdcall;
  external 'OLE32.dll' name 'CLSIDFromString';

result := DllCall("OLE32\CLSIDFromString"
    , "WStr", lpsz   ; LPCWSTR
    , "Ptr", pclsid   ; GUID* out
    , "Int")   ; return: HRESULT

●CLSIDFromString(lpsz, pclsid) = DLL("OLE32.dll", "int CLSIDFromString(char*, void*)")
# 呼び出し: CLSIDFromString(lpsz, pclsid)
# lpsz : LPCWSTR -> "char*"
# pclsid : GUID* out -> "void*"
# 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)。