Imports UsbEject.Library

Public Class Form1

	Private Sub Button1_Click(ByVal sender As System.Object, _
	ByVal e As System.EventArgs) Handles Button1.Click

		Dim volumeDeviceClass As New VolumeDeviceClass()
		For Each device As Volume In volumeDeviceClass.Devices
			' is this volume on USB disks? 
			If Not device.IsUsb Then
				Continue For
			End If

			' is this volume a logical disk? 
			If (device.LogicalDrive Is Nothing) OrElse _
			(device.LogicalDrive.Length = 0) Then
				Continue For
			End If

			MessageBox.Show(device.LogicalDrive)
			' allow Windows to display any relevant UI 
			device.Eject(False)
		Next

	End Sub
End Class

res = CM_Request_Device_EjectW(DevInstParent, &VetoType, VetoNameW, MAX_PATH, 0);
//res = CM_Request_Device_EjectW(DevInstParent, NULL, NULL, 0, 0); // with messagebox (W2K, Vista) or balloon (XP)

#pragma once
#pragma comment( lib, "setupAPI.lib" )

#include <stdio.h>

#include <comdef.h>

#include <Setupapi.h>
#include <winioctl.h>
#include <winioctl.h>
#include <cfgmgr32.h>
#include <vcclr.h>

public:
	int eject( System::String ^drv ) {

		pin_ptr<const wchar_t> wch = PtrToStringChars(drv);
		_bstr_t cstr = wch;
		char *ch = (char *)cstr;

		char szRootPath[] = "X:\\";   // "X:\"  -> for GetDriveType
		szRootPath[0] = ch[0];

		char szDevicePath[] = "X:";   // "X:"   -> for QueryDosDevice
		szDevicePath[0] = ch[0];

		char szVolumeAccessPath[] = "\\\\.\\X:";   // "\\.\X:"  -> to open the volume
		szVolumeAccessPath[4] = ch[0];

Dim a As New test_class.Class1()
a.eject("E")

#include "stdafx.h"
#include <comdef.h>
#include <vcclr.h>

using namespace System;

int main(array<System::String ^> ^args)
{

	_bstr_t a = "日本語表示";

	String ^x;

	x = gcnew String((const wchar_t *)a);

	Console::WriteLine(args[0]);
	Console::WriteLine(x);

	printf( "%s\n", (char *)a );

	pin_ptr<const wchar_t> wch = PtrToStringChars(args[0]);

	_bstr_t b = wch;
	printf( "%s\n", (char *)b );

	Console::ReadLine();

	return 0;

}