SQLGetDescFieldA

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

SHORT SQLGetDescFieldA(
    void* hdesc,
    SHORT iRecord,
    SHORT iField,
    void* rgbValue,   // optional
    INT cbBufferLength,
    INT* StringLength   // optional
);

<DllImport("ODBC32.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function SQLGetDescFieldA(
    hdesc As IntPtr,   ' void* in/out
    iRecord As Short,   ' SHORT
    iField As Short,   ' SHORT
    rgbValue As IntPtr,   ' void* optional, out
    cbBufferLength As Integer,   ' INT
    StringLength As IntPtr   ' INT* optional, out
) As Short
End Function

' hdesc : void* in/out
' iRecord : SHORT
' iField : SHORT
' rgbValue : void* optional, out
' cbBufferLength : INT
' StringLength : INT* optional, out
Declare PtrSafe Function SQLGetDescFieldA Lib "odbc32" ( _
    ByVal hdesc As LongPtr, _
    ByVal iRecord As Integer, _
    ByVal iField As Integer, _
    ByVal rgbValue As LongPtr, _
    ByVal cbBufferLength As Long, _
    ByVal StringLength 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

SQLGetDescFieldA = ctypes.windll.odbc32.SQLGetDescFieldA
SQLGetDescFieldA.restype = ctypes.c_short
SQLGetDescFieldA.argtypes = [
    ctypes.POINTER(None),  # hdesc : void* in/out
    ctypes.c_short,  # iRecord : SHORT
    ctypes.c_short,  # iField : SHORT
    ctypes.POINTER(None),  # rgbValue : void* optional, out
    ctypes.c_int,  # cbBufferLength : INT
    ctypes.POINTER(ctypes.c_int),  # StringLength : INT* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ODBC32.dll')
SQLGetDescFieldA = Fiddle::Function.new(
  lib['SQLGetDescFieldA'],
  [
    Fiddle::TYPE_VOIDP,  # hdesc : void* in/out
    Fiddle::TYPE_SHORT,  # iRecord : SHORT
    Fiddle::TYPE_SHORT,  # iField : SHORT
    Fiddle::TYPE_VOIDP,  # rgbValue : void* optional, out
    Fiddle::TYPE_INT,  # cbBufferLength : INT
    Fiddle::TYPE_VOIDP,  # StringLength : INT* optional, out
  ],
  Fiddle::TYPE_SHORT)

#[link(name = "odbc32")]
extern "system" {
    fn SQLGetDescFieldA(
        hdesc: *mut (),  // void* in/out
        iRecord: i16,  // SHORT
        iField: i16,  // SHORT
        rgbValue: *mut (),  // void* optional, out
        cbBufferLength: i32,  // INT
        StringLength: *mut i32  // INT* optional, out
    ) -> i16;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ODBC32.dll", CharSet = CharSet.Ansi)]
public static extern short SQLGetDescFieldA(IntPtr hdesc, short iRecord, short iField, IntPtr rgbValue, int cbBufferLength, IntPtr StringLength);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ODBC32_SQLGetDescFieldA' -Namespace Win32 -PassThru
# $api::SQLGetDescFieldA(hdesc, iRecord, iField, rgbValue, cbBufferLength, StringLength)

#uselib "ODBC32.dll"
#func global SQLGetDescFieldA "SQLGetDescFieldA" sptr, sptr, sptr, sptr, sptr, sptr
; SQLGetDescFieldA hdesc, iRecord, iField, rgbValue, cbBufferLength, varptr(StringLength)   ; 戻り値は stat
; hdesc : void* in/out -> "sptr"
; iRecord : SHORT -> "sptr"
; iField : SHORT -> "sptr"
; rgbValue : void* optional, out -> "sptr"
; cbBufferLength : INT -> "sptr"
; StringLength : INT* 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 SQLGetDescFieldA "SQLGetDescFieldA" sptr, int, int, sptr, int, var
; res = SQLGetDescFieldA(hdesc, iRecord, iField, rgbValue, cbBufferLength, StringLength)
; hdesc : void* in/out -> "sptr"
; iRecord : SHORT -> "int"
; iField : SHORT -> "int"
; rgbValue : void* optional, out -> "sptr"
; cbBufferLength : INT -> "int"
; StringLength : INT* 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 SQLGetDescFieldA(void* hdesc, SHORT iRecord, SHORT iField, void* rgbValue, INT cbBufferLength, INT* StringLength)
#uselib "ODBC32.dll"
#cfunc global SQLGetDescFieldA "SQLGetDescFieldA" intptr, int, int, intptr, int, var
; res = SQLGetDescFieldA(hdesc, iRecord, iField, rgbValue, cbBufferLength, StringLength)
; hdesc : void* in/out -> "intptr"
; iRecord : SHORT -> "int"
; iField : SHORT -> "int"
; rgbValue : void* optional, out -> "intptr"
; cbBufferLength : INT -> "int"
; StringLength : INT* 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")
	procSQLGetDescFieldA = odbc32.NewProc("SQLGetDescFieldA")
)

// hdesc (void* in/out), iRecord (SHORT), iField (SHORT), rgbValue (void* optional, out), cbBufferLength (INT), StringLength (INT* optional, out)
r1, _, err := procSQLGetDescFieldA.Call(
	uintptr(hdesc),
	uintptr(iRecord),
	uintptr(iField),
	uintptr(rgbValue),
	uintptr(cbBufferLength),
	uintptr(StringLength),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // SHORT

function SQLGetDescFieldA(
  hdesc: Pointer;   // void* in/out
  iRecord: Smallint;   // SHORT
  iField: Smallint;   // SHORT
  rgbValue: Pointer;   // void* optional, out
  cbBufferLength: Integer;   // INT
  StringLength: Pointer   // INT* optional, out
): Smallint; stdcall;
  external 'ODBC32.dll' name 'SQLGetDescFieldA';

result := DllCall("ODBC32\SQLGetDescFieldA"
    , "Ptr", hdesc   ; void* in/out
    , "Short", iRecord   ; SHORT
    , "Short", iField   ; SHORT
    , "Ptr", rgbValue   ; void* optional, out
    , "Int", cbBufferLength   ; INT
    , "Ptr", StringLength   ; INT* optional, out
    , "Short")   ; return: SHORT

●SQLGetDescFieldA(hdesc, iRecord, iField, rgbValue, cbBufferLength, StringLength) = DLL("ODBC32.dll", "int SQLGetDescFieldA(void*, int, int, void*, int, void*)")
# 呼び出し: SQLGetDescFieldA(hdesc, iRecord, iField, rgbValue, cbBufferLength, StringLength)
# hdesc : void* in/out -> "void*"
# iRecord : SHORT -> "int"
# iField : SHORT -> "int"
# rgbValue : void* optional, out -> "void*"
# cbBufferLength : INT -> "int"
# StringLength : INT* 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)。