SQLDescribeParam

// ODBC32.dll
#include <windows.h>

SHORT SQLDescribeParam(
    void* hstmt,
    WORD ipar,
    SHORT* pfSqlType,   // optional
    DWORD* pcbParamDef,   // optional
    SHORT* pibScale,   // optional
    SHORT* pfNullable   // optional
);

<DllImport("ODBC32.dll", ExactSpelling:=True)>
Public Shared Function SQLDescribeParam(
    hstmt As IntPtr,   ' void* in/out
    ipar As UShort,   ' WORD
    pfSqlType As IntPtr,   ' SHORT* optional, out
    pcbParamDef As IntPtr,   ' DWORD* optional, out
    pibScale As IntPtr,   ' SHORT* optional, out
    pfNullable As IntPtr   ' SHORT* optional, out
) As Short
End Function

' hstmt : void* in/out
' ipar : WORD
' pfSqlType : SHORT* optional, out
' pcbParamDef : DWORD* optional, out
' pibScale : SHORT* optional, out
' pfNullable : SHORT* optional, out
Declare PtrSafe Function SQLDescribeParam Lib "odbc32" ( _
    ByVal hstmt As LongPtr, _
    ByVal ipar As Integer, _
    ByVal pfSqlType As LongPtr, _
    ByVal pcbParamDef As LongPtr, _
    ByVal pibScale As LongPtr, _
    ByVal pfNullable As LongPtr) As Integer
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SQLDescribeParam = ctypes.windll.odbc32.SQLDescribeParam
SQLDescribeParam.restype = ctypes.c_short
SQLDescribeParam.argtypes = [
    ctypes.POINTER(None),  # hstmt : void* in/out
    ctypes.c_ushort,  # ipar : WORD
    ctypes.POINTER(ctypes.c_short),  # pfSqlType : SHORT* optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcbParamDef : DWORD* optional, out
    ctypes.POINTER(ctypes.c_short),  # pibScale : SHORT* optional, out
    ctypes.POINTER(ctypes.c_short),  # pfNullable : SHORT* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ODBC32.dll')
SQLDescribeParam = Fiddle::Function.new(
  lib['SQLDescribeParam'],
  [
    Fiddle::TYPE_VOIDP,  # hstmt : void* in/out
    -Fiddle::TYPE_SHORT,  # ipar : WORD
    Fiddle::TYPE_VOIDP,  # pfSqlType : SHORT* optional, out
    Fiddle::TYPE_VOIDP,  # pcbParamDef : DWORD* optional, out
    Fiddle::TYPE_VOIDP,  # pibScale : SHORT* optional, out
    Fiddle::TYPE_VOIDP,  # pfNullable : SHORT* optional, out
  ],
  Fiddle::TYPE_SHORT)

#[link(name = "odbc32")]
extern "system" {
    fn SQLDescribeParam(
        hstmt: *mut (),  // void* in/out
        ipar: u16,  // WORD
        pfSqlType: *mut i16,  // SHORT* optional, out
        pcbParamDef: *mut u32,  // DWORD* optional, out
        pibScale: *mut i16,  // SHORT* optional, out
        pfNullable: *mut i16  // SHORT* optional, out
    ) -> i16;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ODBC32.dll")]
public static extern short SQLDescribeParam(IntPtr hstmt, ushort ipar, IntPtr pfSqlType, IntPtr pcbParamDef, IntPtr pibScale, IntPtr pfNullable);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ODBC32_SQLDescribeParam' -Namespace Win32 -PassThru
# $api::SQLDescribeParam(hstmt, ipar, pfSqlType, pcbParamDef, pibScale, pfNullable)

#uselib "ODBC32.dll"
#func global SQLDescribeParam "SQLDescribeParam" sptr, sptr, sptr, sptr, sptr, sptr
; SQLDescribeParam hstmt, ipar, varptr(pfSqlType), varptr(pcbParamDef), varptr(pibScale), varptr(pfNullable)   ; 戻り値は stat
; hstmt : void* in/out -> "sptr"
; ipar : WORD -> "sptr"
; pfSqlType : SHORT* optional, out -> "sptr"
; pcbParamDef : DWORD* optional, out -> "sptr"
; pibScale : SHORT* optional, out -> "sptr"
; pfNullable : SHORT* optional, 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 "ODBC32.dll"
#cfunc global SQLDescribeParam "SQLDescribeParam" sptr, int, var, var, var, var
; res = SQLDescribeParam(hstmt, ipar, pfSqlType, pcbParamDef, pibScale, pfNullable)
; hstmt : void* in/out -> "sptr"
; ipar : WORD -> "int"
; pfSqlType : SHORT* optional, out -> "var"
; pcbParamDef : DWORD* optional, out -> "var"
; pibScale : SHORT* optional, out -> "var"
; pfNullable : SHORT* optional, 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。

; SHORT SQLDescribeParam(void* hstmt, WORD ipar, SHORT* pfSqlType, DWORD* pcbParamDef, SHORT* pibScale, SHORT* pfNullable)
#uselib "ODBC32.dll"
#cfunc global SQLDescribeParam "SQLDescribeParam" intptr, int, var, var, var, var
; res = SQLDescribeParam(hstmt, ipar, pfSqlType, pcbParamDef, pibScale, pfNullable)
; hstmt : void* in/out -> "intptr"
; ipar : WORD -> "int"
; pfSqlType : SHORT* optional, out -> "var"
; pcbParamDef : DWORD* optional, out -> "var"
; pibScale : SHORT* optional, out -> "var"
; pfNullable : SHORT* optional, 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 (
	odbc32 = windows.NewLazySystemDLL("ODBC32.dll")
	procSQLDescribeParam = odbc32.NewProc("SQLDescribeParam")
)

// hstmt (void* in/out), ipar (WORD), pfSqlType (SHORT* optional, out), pcbParamDef (DWORD* optional, out), pibScale (SHORT* optional, out), pfNullable (SHORT* optional, out)
r1, _, err := procSQLDescribeParam.Call(
	uintptr(hstmt),
	uintptr(ipar),
	uintptr(pfSqlType),
	uintptr(pcbParamDef),
	uintptr(pibScale),
	uintptr(pfNullable),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // SHORT

function SQLDescribeParam(
  hstmt: Pointer;   // void* in/out
  ipar: Word;   // WORD
  pfSqlType: Pointer;   // SHORT* optional, out
  pcbParamDef: Pointer;   // DWORD* optional, out
  pibScale: Pointer;   // SHORT* optional, out
  pfNullable: Pointer   // SHORT* optional, out
): Smallint; stdcall;
  external 'ODBC32.dll' name 'SQLDescribeParam';

result := DllCall("ODBC32\SQLDescribeParam"
    , "Ptr", hstmt   ; void* in/out
    , "UShort", ipar   ; WORD
    , "Ptr", pfSqlType   ; SHORT* optional, out
    , "Ptr", pcbParamDef   ; DWORD* optional, out
    , "Ptr", pibScale   ; SHORT* optional, out
    , "Ptr", pfNullable   ; SHORT* optional, out
    , "Short")   ; return: SHORT

●SQLDescribeParam(hstmt, ipar, pfSqlType, pcbParamDef, pibScale, pfNullable) = DLL("ODBC32.dll", "int SQLDescribeParam(void*, int, void*, void*, void*, void*)")
# 呼び出し: SQLDescribeParam(hstmt, ipar, pfSqlType, pcbParamDef, pibScale, pfNullable)
# hstmt : void* in/out -> "void*"
# ipar : WORD -> "int"
# pfSqlType : SHORT* optional, out -> "void*"
# pcbParamDef : DWORD* optional, out -> "void*"
# pibScale : SHORT* optional, out -> "void*"
# pfNullable : SHORT* optional, 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)。