SQLColAttribute

// ODBC32.dll  (ANSI / -A)
#include <windows.h>

SHORT SQLColAttribute(
    void* StatementHandle,
    WORD ColumnNumber,
    WORD FieldIdentifier,
    void* CharacterAttribute,   // optional
    SHORT BufferLength,
    SHORT* StringLength,   // optional
    void* NumericAttribute   // optional
);

<DllImport("ODBC32.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function SQLColAttribute(
    StatementHandle As IntPtr,   ' void* in/out
    ColumnNumber As UShort,   ' WORD
    FieldIdentifier As UShort,   ' WORD
    CharacterAttribute As IntPtr,   ' void* optional, out
    BufferLength As Short,   ' SHORT
    StringLength As IntPtr,   ' SHORT* optional, out
    NumericAttribute As IntPtr   ' void* optional, out
) As Short
End Function

' StatementHandle : void* in/out
' ColumnNumber : WORD
' FieldIdentifier : WORD
' CharacterAttribute : void* optional, out
' BufferLength : SHORT
' StringLength : SHORT* optional, out
' NumericAttribute : void* optional, out
Declare PtrSafe Function SQLColAttribute Lib "odbc32" ( _
    ByVal StatementHandle As LongPtr, _
    ByVal ColumnNumber As Integer, _
    ByVal FieldIdentifier As Integer, _
    ByVal CharacterAttribute As LongPtr, _
    ByVal BufferLength As Integer, _
    ByVal StringLength As LongPtr, _
    ByVal NumericAttribute 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

SQLColAttribute = ctypes.windll.odbc32.SQLColAttribute
SQLColAttribute.restype = ctypes.c_short
SQLColAttribute.argtypes = [
    ctypes.POINTER(None),  # StatementHandle : void* in/out
    ctypes.c_ushort,  # ColumnNumber : WORD
    ctypes.c_ushort,  # FieldIdentifier : WORD
    ctypes.POINTER(None),  # CharacterAttribute : void* optional, out
    ctypes.c_short,  # BufferLength : SHORT
    ctypes.POINTER(ctypes.c_short),  # StringLength : SHORT* optional, out
    ctypes.POINTER(None),  # NumericAttribute : void* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ODBC32.dll')
SQLColAttribute = Fiddle::Function.new(
  lib['SQLColAttribute'],
  [
    Fiddle::TYPE_VOIDP,  # StatementHandle : void* in/out
    -Fiddle::TYPE_SHORT,  # ColumnNumber : WORD
    -Fiddle::TYPE_SHORT,  # FieldIdentifier : WORD
    Fiddle::TYPE_VOIDP,  # CharacterAttribute : void* optional, out
    Fiddle::TYPE_SHORT,  # BufferLength : SHORT
    Fiddle::TYPE_VOIDP,  # StringLength : SHORT* optional, out
    Fiddle::TYPE_VOIDP,  # NumericAttribute : void* optional, out
  ],
  Fiddle::TYPE_SHORT)

#[link(name = "odbc32")]
extern "system" {
    fn SQLColAttribute(
        StatementHandle: *mut (),  // void* in/out
        ColumnNumber: u16,  // WORD
        FieldIdentifier: u16,  // WORD
        CharacterAttribute: *mut (),  // void* optional, out
        BufferLength: i16,  // SHORT
        StringLength: *mut i16,  // SHORT* optional, out
        NumericAttribute: *mut ()  // void* optional, out
    ) -> i16;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ODBC32.dll", CharSet = CharSet.Ansi)]
public static extern short SQLColAttribute(IntPtr StatementHandle, ushort ColumnNumber, ushort FieldIdentifier, IntPtr CharacterAttribute, short BufferLength, IntPtr StringLength, IntPtr NumericAttribute);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ODBC32_SQLColAttribute' -Namespace Win32 -PassThru
# $api::SQLColAttribute(StatementHandle, ColumnNumber, FieldIdentifier, CharacterAttribute, BufferLength, StringLength, NumericAttribute)

#uselib "ODBC32.dll"
#func global SQLColAttribute "SQLColAttribute" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; SQLColAttribute StatementHandle, ColumnNumber, FieldIdentifier, CharacterAttribute, BufferLength, varptr(StringLength), NumericAttribute   ; 戻り値は stat
; StatementHandle : void* in/out -> "sptr"
; ColumnNumber : WORD -> "sptr"
; FieldIdentifier : WORD -> "sptr"
; CharacterAttribute : void* optional, out -> "sptr"
; BufferLength : SHORT -> "sptr"
; StringLength : SHORT* optional, out -> "sptr"
; NumericAttribute : void* 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 SQLColAttribute "SQLColAttribute" sptr, int, int, sptr, int, var, sptr
; res = SQLColAttribute(StatementHandle, ColumnNumber, FieldIdentifier, CharacterAttribute, BufferLength, StringLength, NumericAttribute)
; StatementHandle : void* in/out -> "sptr"
; ColumnNumber : WORD -> "int"
; FieldIdentifier : WORD -> "int"
; CharacterAttribute : void* optional, out -> "sptr"
; BufferLength : SHORT -> "int"
; StringLength : SHORT* optional, out -> "var"
; NumericAttribute : void* optional, out -> "sptr"
; ※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 SQLColAttribute(void* StatementHandle, WORD ColumnNumber, WORD FieldIdentifier, void* CharacterAttribute, SHORT BufferLength, SHORT* StringLength, void* NumericAttribute)
#uselib "ODBC32.dll"
#cfunc global SQLColAttribute "SQLColAttribute" intptr, int, int, intptr, int, var, intptr
; res = SQLColAttribute(StatementHandle, ColumnNumber, FieldIdentifier, CharacterAttribute, BufferLength, StringLength, NumericAttribute)
; StatementHandle : void* in/out -> "intptr"
; ColumnNumber : WORD -> "int"
; FieldIdentifier : WORD -> "int"
; CharacterAttribute : void* optional, out -> "intptr"
; BufferLength : SHORT -> "int"
; StringLength : SHORT* optional, out -> "var"
; NumericAttribute : void* optional, out -> "intptr"
; ※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")
	procSQLColAttribute = odbc32.NewProc("SQLColAttribute")
)

// StatementHandle (void* in/out), ColumnNumber (WORD), FieldIdentifier (WORD), CharacterAttribute (void* optional, out), BufferLength (SHORT), StringLength (SHORT* optional, out), NumericAttribute (void* optional, out)
r1, _, err := procSQLColAttribute.Call(
	uintptr(StatementHandle),
	uintptr(ColumnNumber),
	uintptr(FieldIdentifier),
	uintptr(CharacterAttribute),
	uintptr(BufferLength),
	uintptr(StringLength),
	uintptr(NumericAttribute),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // SHORT

function SQLColAttribute(
  StatementHandle: Pointer;   // void* in/out
  ColumnNumber: Word;   // WORD
  FieldIdentifier: Word;   // WORD
  CharacterAttribute: Pointer;   // void* optional, out
  BufferLength: Smallint;   // SHORT
  StringLength: Pointer;   // SHORT* optional, out
  NumericAttribute: Pointer   // void* optional, out
): Smallint; stdcall;
  external 'ODBC32.dll' name 'SQLColAttribute';

result := DllCall("ODBC32\SQLColAttribute"
    , "Ptr", StatementHandle   ; void* in/out
    , "UShort", ColumnNumber   ; WORD
    , "UShort", FieldIdentifier   ; WORD
    , "Ptr", CharacterAttribute   ; void* optional, out
    , "Short", BufferLength   ; SHORT
    , "Ptr", StringLength   ; SHORT* optional, out
    , "Ptr", NumericAttribute   ; void* optional, out
    , "Short")   ; return: SHORT

●SQLColAttribute(StatementHandle, ColumnNumber, FieldIdentifier, CharacterAttribute, BufferLength, StringLength, NumericAttribute) = DLL("ODBC32.dll", "int SQLColAttribute(void*, int, int, void*, int, void*, void*)")
# 呼び出し: SQLColAttribute(StatementHandle, ColumnNumber, FieldIdentifier, CharacterAttribute, BufferLength, StringLength, NumericAttribute)
# StatementHandle : void* in/out -> "void*"
# ColumnNumber : WORD -> "int"
# FieldIdentifier : WORD -> "int"
# CharacterAttribute : void* optional, out -> "void*"
# BufferLength : SHORT -> "int"
# StringLength : SHORT* optional, out -> "void*"
# NumericAttribute : void* 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)。