glGetString

関数

OpenGL実装の各種情報文字列を取得する。

DLLOPENGL32.dll呼出規約winapi

シグネチャ

// OPENGL32.dll
#include <windows.h>

BYTE* glGetString(
    DWORD name
);

パラメーター

名前	型	方向
name	DWORD	in

戻り値の型: BYTE*

各言語での呼び出し定義

// OPENGL32.dll
#include <windows.h>

BYTE* glGetString(
    DWORD name
);

[DllImport("OPENGL32.dll", ExactSpelling = true)]
static extern IntPtr glGetString(
    uint name   // DWORD
);

<DllImport("OPENGL32.dll", ExactSpelling:=True)>
Public Shared Function glGetString(
    name As UInteger   ' DWORD
) As IntPtr
End Function

' name : DWORD
Declare PtrSafe Function glGetString Lib "opengl32" ( _
    ByVal name As Long) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

glGetString = ctypes.windll.opengl32.glGetString
glGetString.restype = ctypes.c_void_p
glGetString.argtypes = [
    wintypes.DWORD,  # name : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OPENGL32.dll')
glGetString = Fiddle::Function.new(
  lib['glGetString'],
  [
    -Fiddle::TYPE_INT,  # name : DWORD
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "opengl32")]
extern "system" {
    fn glGetString(
        name: u32  // DWORD
    ) -> *mut u8;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OPENGL32.dll")]
public static extern IntPtr glGetString(uint name);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OPENGL32_glGetString' -Namespace Win32 -PassThru
# $api::glGetString(name)

#uselib "OPENGL32.dll"
#func global glGetString "glGetString" sptr
; glGetString name   ; 戻り値は stat
; name : DWORD -> "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 "OPENGL32.dll"
#cfunc global glGetString "glGetString" int
; res = glGetString(name)
; name : DWORD -> "int"

; BYTE* glGetString(DWORD name)
#uselib "OPENGL32.dll"
#cfunc global glGetString "glGetString" int
; res = glGetString(name)
; name : DWORD -> "int"

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

var (
	opengl32 = windows.NewLazySystemDLL("OPENGL32.dll")
	procglGetString = opengl32.NewProc("glGetString")
)

// name (DWORD)
r1, _, err := procglGetString.Call(
	uintptr(name),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BYTE*

function glGetString(
  name: DWORD   // DWORD
): Pointer; stdcall;
  external 'OPENGL32.dll' name 'glGetString';

result := DllCall("OPENGL32\glGetString"
    , "UInt", name   ; DWORD
    , "Ptr")   ; return: BYTE*

●glGetString(name) = DLL("OPENGL32.dll", "void* glGetString(dword)")
# 呼び出し: glGetString(name)
# name : DWORD -> "dword"
# 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)。