VarR4FromDec

関数

DECIMAL値をFLOAT（単精度浮動小数点数）に変換する。

DLLOLEAUT32.dll呼出規約winapi

シグネチャ

// OLEAUT32.dll
#include <windows.h>

HRESULT VarR4FromDec(
    const DECIMAL* pdecIn,
    FLOAT* pfltOut
);

パラメーター

名前	型	方向
pdecIn	DECIMAL*	in
pfltOut	FLOAT*	out

戻り値の型: HRESULT

各言語での呼び出し定義

// OLEAUT32.dll
#include <windows.h>

HRESULT VarR4FromDec(
    const DECIMAL* pdecIn,
    FLOAT* pfltOut
);

[DllImport("OLEAUT32.dll", ExactSpelling = true)]
static extern int VarR4FromDec(
    IntPtr pdecIn,   // DECIMAL*
    out float pfltOut   // FLOAT* out
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VarR4FromDec(
    pdecIn As IntPtr,   ' DECIMAL*
    <Out> ByRef pfltOut As Single   ' FLOAT* out
) As Integer
End Function

' pdecIn : DECIMAL*
' pfltOut : FLOAT* out
Declare PtrSafe Function VarR4FromDec Lib "oleaut32" ( _
    ByVal pdecIn As LongPtr, _
    ByRef pfltOut As Single) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

VarR4FromDec = ctypes.windll.oleaut32.VarR4FromDec
VarR4FromDec.restype = ctypes.c_int
VarR4FromDec.argtypes = [
    ctypes.c_void_p,  # pdecIn : DECIMAL*
    ctypes.POINTER(ctypes.c_float),  # pfltOut : FLOAT* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VarR4FromDec = Fiddle::Function.new(
  lib['VarR4FromDec'],
  [
    Fiddle::TYPE_VOIDP,  # pdecIn : DECIMAL*
    Fiddle::TYPE_VOIDP,  # pfltOut : FLOAT* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn VarR4FromDec(
        pdecIn: *const DECIMAL,  // DECIMAL*
        pfltOut: *mut f32  // FLOAT* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VarR4FromDec(IntPtr pdecIn, out float pfltOut);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VarR4FromDec' -Namespace Win32 -PassThru
# $api::VarR4FromDec(pdecIn, pfltOut)

#uselib "OLEAUT32.dll"
#func global VarR4FromDec "VarR4FromDec" sptr, sptr
; VarR4FromDec varptr(pdecIn), varptr(pfltOut)   ; 戻り値は stat
; pdecIn : DECIMAL* -> "sptr"
; pfltOut : FLOAT* 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。

出力引数:

#uselib "OLEAUT32.dll"
#cfunc global VarR4FromDec "VarR4FromDec" var, var
; res = VarR4FromDec(pdecIn, pfltOut)
; pdecIn : DECIMAL* -> "var"
; pfltOut : FLOAT* 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。#uselib "OLEAUT32.dll"
#cfunc global VarR4FromDec "VarR4FromDec" sptr, sptr
; res = VarR4FromDec(varptr(pdecIn), varptr(pfltOut))
; pdecIn : DECIMAL* -> "sptr"
; pfltOut : FLOAT* out -> "sptr"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; HRESULT VarR4FromDec(DECIMAL* pdecIn, FLOAT* pfltOut)
#uselib "OLEAUT32.dll"
#cfunc global VarR4FromDec "VarR4FromDec" var, var
; res = VarR4FromDec(pdecIn, pfltOut)
; pdecIn : DECIMAL* -> "var"
; pfltOut : FLOAT* 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 VarR4FromDec(DECIMAL* pdecIn, FLOAT* pfltOut)
#uselib "OLEAUT32.dll"
#cfunc global VarR4FromDec "VarR4FromDec" intptr, intptr
; res = VarR4FromDec(varptr(pdecIn), varptr(pfltOut))
; pdecIn : DECIMAL* -> "intptr"
; pfltOut : FLOAT* out -> "intptr"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

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

var (
	oleaut32 = windows.NewLazySystemDLL("OLEAUT32.dll")
	procVarR4FromDec = oleaut32.NewProc("VarR4FromDec")
)

// pdecIn (DECIMAL*), pfltOut (FLOAT* out)
r1, _, err := procVarR4FromDec.Call(
	uintptr(pdecIn),
	uintptr(pfltOut),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function VarR4FromDec(
  pdecIn: Pointer;   // DECIMAL*
  pfltOut: Pointer   // FLOAT* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarR4FromDec';

result := DllCall("OLEAUT32\VarR4FromDec"
    , "Ptr", pdecIn   ; DECIMAL*
    , "Ptr", pfltOut   ; FLOAT* out
    , "Int")   ; return: HRESULT

●VarR4FromDec(pdecIn, pfltOut) = DLL("OLEAUT32.dll", "int VarR4FromDec(void*, void*)")
# 呼び出し: VarR4FromDec(pdecIn, pfltOut)
# pdecIn : DECIMAL* -> "void*"
# pfltOut : FLOAT* 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)。