C# Beep(Win32API) – テックメモ

using System;
using System.Windows.Forms;

using System.Runtime.InteropServices;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        //https://msdn.microsoft.com/ja-jp/library/cc428923.aspx

        //関数の存在するdllを指定。
        [DllImport("kernel32.dll")]

        //関数の実体が外部にあることを示す。
        extern static bool Beep(uint dwFreq, uint dwDuration);

        public Form1()
        {
            InitializeComponent();

            button1.Click += new EventHandler((object sender, EventArgs e) => {
                Beep(262, 500);
            });
        }
    }
}

/*

Win32API / .NET

HANDLE (void *)               System.IntPtr
BYTE (unsigned char)          byte (System.Byte)
SHORT (short)                 short (System.Int16)
WORD (unsigned short)         ushort (System.UInt16)
INT (int)                     int (System.Int32)
LONG (long)
UINT (unsigned int)           uint (System.UInt32)
DWORD, ULONG (unsigned long)
BOOL (long)                   bool (System.Boolean)
CHAR (char)                   char (System.Char)
LPSTR (char *)                System.Text.StringBuilder
LPWSTR (wchar_t *)
LPCSTR (const char *)         string (System.String)
LPCWSTR (const wchar_t *)
FLOAT (float)                 float (System.Single)
DOUBLE (double)               double (System.Double)

*/

using System;

using System.Windows.Forms;

using System.Runtime.InteropServices;

namespace WindowsFormsApplication1

{

public partial class Form1 : Form

{

//https://msdn.microsoft.com/ja-jp/library/cc428923.aspx

//関数の存在するdllを指定。

[DllImport("kernel32.dll")]

//関数の実体が外部にあることを示す。

extern static bool Beep(uint dwFreq, uint dwDuration);

public Form1()

{

InitializeComponent();

button1.Click += new EventHandler((object sender, EventArgs e) => {

Beep(262, 500);

});

}

Win32API / .NET

HANDLE (void *) System.IntPtr

BYTE (unsigned char) byte (System.Byte)

SHORT (short) short (System.Int16)

WORD (unsigned short) ushort (System.UInt16)

INT (int) int (System.Int32)

LONG (long)

UINT (unsigned int) uint (System.UInt32)

DWORD, ULONG (unsigned long)

BOOL (long) bool (System.Boolean)

CHAR (char) char (System.Char)

LPSTR (char *) System.Text.StringBuilder

LPWSTR (wchar_t *)

LPCSTR (const char *) string (System.String)

LPCWSTR (const wchar_t *)

FLOAT (float) float (System.Single)

DOUBLE (double) double (System.Double)