SQLConnectA

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

SHORT SQLConnectA(
    void* hdbc,
    BYTE* szDSN,
    SHORT cbDSN,
    BYTE* szUID,
    SHORT cbUID,
    BYTE* szAuthStr,
    SHORT cbAuthStr
);

<DllImport("ODBC32.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function SQLConnectA(
    hdbc As IntPtr,   ' void* in/out
    szDSN As IntPtr,   ' BYTE*
    cbDSN As Short,   ' SHORT
    szUID As IntPtr,   ' BYTE*
    cbUID As Short,   ' SHORT
    szAuthStr As IntPtr,   ' BYTE*
    cbAuthStr As Short   ' SHORT
) As Short
End Function

' hdbc : void* in/out
' szDSN : BYTE*
' cbDSN : SHORT
' szUID : BYTE*
' cbUID : SHORT
' szAuthStr : BYTE*
' cbAuthStr : SHORT
Declare PtrSafe Function SQLConnectA Lib "odbc32" ( _
    ByVal hdbc As LongPtr, _
    ByVal szDSN As LongPtr, _
    ByVal cbDSN As Integer, _
    ByVal szUID As LongPtr, _
    ByVal cbUID As Integer, _
    ByVal szAuthStr As LongPtr, _
    ByVal cbAuthStr As Integer) As Integer
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SQLConnectA = ctypes.windll.odbc32.SQLConnectA
SQLConnectA.restype = ctypes.c_short
SQLConnectA.argtypes = [
    ctypes.POINTER(None),  # hdbc : void* in/out
    ctypes.POINTER(ctypes.c_ubyte),  # szDSN : BYTE*
    ctypes.c_short,  # cbDSN : SHORT
    ctypes.POINTER(ctypes.c_ubyte),  # szUID : BYTE*
    ctypes.c_short,  # cbUID : SHORT
    ctypes.POINTER(ctypes.c_ubyte),  # szAuthStr : BYTE*
    ctypes.c_short,  # cbAuthStr : SHORT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ODBC32.dll')
SQLConnectA = Fiddle::Function.new(
  lib['SQLConnectA'],
  [
    Fiddle::TYPE_VOIDP,  # hdbc : void* in/out
    Fiddle::TYPE_VOIDP,  # szDSN : BYTE*
    Fiddle::TYPE_SHORT,  # cbDSN : SHORT
    Fiddle::TYPE_VOIDP,  # szUID : BYTE*
    Fiddle::TYPE_SHORT,  # cbUID : SHORT
    Fiddle::TYPE_VOIDP,  # szAuthStr : BYTE*
    Fiddle::TYPE_SHORT,  # cbAuthStr : SHORT
  ],
  Fiddle::TYPE_SHORT)

#[link(name = "odbc32")]
extern "system" {
    fn SQLConnectA(
        hdbc: *mut (),  // void* in/out
        szDSN: *mut u8,  // BYTE*
        cbDSN: i16,  // SHORT
        szUID: *mut u8,  // BYTE*
        cbUID: i16,  // SHORT
        szAuthStr: *mut u8,  // BYTE*
        cbAuthStr: i16  // SHORT
    ) -> i16;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ODBC32.dll", CharSet = CharSet.Ansi)]
public static extern short SQLConnectA(IntPtr hdbc, IntPtr szDSN, short cbDSN, IntPtr szUID, short cbUID, IntPtr szAuthStr, short cbAuthStr);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ODBC32_SQLConnectA' -Namespace Win32 -PassThru
# $api::SQLConnectA(hdbc, szDSN, cbDSN, szUID, cbUID, szAuthStr, cbAuthStr)

#uselib "ODBC32.dll"
#func global SQLConnectA "SQLConnectA" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; SQLConnectA hdbc, varptr(szDSN), cbDSN, varptr(szUID), cbUID, varptr(szAuthStr), cbAuthStr   ; 戻り値は stat
; hdbc : void* in/out -> "sptr"
; szDSN : BYTE* -> "sptr"
; cbDSN : SHORT -> "sptr"
; szUID : BYTE* -> "sptr"
; cbUID : SHORT -> "sptr"
; szAuthStr : BYTE* -> "sptr"
; cbAuthStr : SHORT -> "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 SQLConnectA "SQLConnectA" sptr, var, int, var, int, var, int
; res = SQLConnectA(hdbc, szDSN, cbDSN, szUID, cbUID, szAuthStr, cbAuthStr)
; hdbc : void* in/out -> "sptr"
; szDSN : BYTE* -> "var"
; cbDSN : SHORT -> "int"
; szUID : BYTE* -> "var"
; cbUID : SHORT -> "int"
; szAuthStr : BYTE* -> "var"
; cbAuthStr : SHORT -> "int"
; ※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 SQLConnectA(void* hdbc, BYTE* szDSN, SHORT cbDSN, BYTE* szUID, SHORT cbUID, BYTE* szAuthStr, SHORT cbAuthStr)
#uselib "ODBC32.dll"
#cfunc global SQLConnectA "SQLConnectA" intptr, var, int, var, int, var, int
; res = SQLConnectA(hdbc, szDSN, cbDSN, szUID, cbUID, szAuthStr, cbAuthStr)
; hdbc : void* in/out -> "intptr"
; szDSN : BYTE* -> "var"
; cbDSN : SHORT -> "int"
; szUID : BYTE* -> "var"
; cbUID : SHORT -> "int"
; szAuthStr : BYTE* -> "var"
; cbAuthStr : SHORT -> "int"
; ※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")
	procSQLConnectA = odbc32.NewProc("SQLConnectA")
)

// hdbc (void* in/out), szDSN (BYTE*), cbDSN (SHORT), szUID (BYTE*), cbUID (SHORT), szAuthStr (BYTE*), cbAuthStr (SHORT)
r1, _, err := procSQLConnectA.Call(
	uintptr(hdbc),
	uintptr(szDSN),
	uintptr(cbDSN),
	uintptr(szUID),
	uintptr(cbUID),
	uintptr(szAuthStr),
	uintptr(cbAuthStr),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // SHORT

function SQLConnectA(
  hdbc: Pointer;   // void* in/out
  szDSN: Pointer;   // BYTE*
  cbDSN: Smallint;   // SHORT
  szUID: Pointer;   // BYTE*
  cbUID: Smallint;   // SHORT
  szAuthStr: Pointer;   // BYTE*
  cbAuthStr: Smallint   // SHORT
): Smallint; stdcall;
  external 'ODBC32.dll' name 'SQLConnectA';

result := DllCall("ODBC32\SQLConnectA"
    , "Ptr", hdbc   ; void* in/out
    , "Ptr", szDSN   ; BYTE*
    , "Short", cbDSN   ; SHORT
    , "Ptr", szUID   ; BYTE*
    , "Short", cbUID   ; SHORT
    , "Ptr", szAuthStr   ; BYTE*
    , "Short", cbAuthStr   ; SHORT
    , "Short")   ; return: SHORT

●SQLConnectA(hdbc, szDSN, cbDSN, szUID, cbUID, szAuthStr, cbAuthStr) = DLL("ODBC32.dll", "int SQLConnectA(void*, void*, int, void*, int, void*, int)")
# 呼び出し: SQLConnectA(hdbc, szDSN, cbDSN, szUID, cbUID, szAuthStr, cbAuthStr)
# hdbc : void* in/out -> "void*"
# szDSN : BYTE* -> "void*"
# cbDSN : SHORT -> "int"
# szUID : BYTE* -> "void*"
# cbUID : SHORT -> "int"
# szAuthStr : BYTE* -> "void*"
# cbAuthStr : SHORT -> "int"
# 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)。