Usb_id

//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include <stdio.h>
#include <windows.h>
#include <Setupapi.h>
#include <devguid.h>
#include "conio.h"
#include "tchar.h"
//#include <devguid.h>
DEFINE_GUID( GUID_DEVCLASS_USB,0x36FC9E60, 0xC465, 0x11CF, 0x80, 0x56, 0x44, 0x45, 0x53, 0x54, 0x00, 0x00 );
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
HDEVINFO deviceInfoSet;
GUID *guidDev = (GUID*) &GUID_DEVCLASS_USB;
deviceInfoSet = SetupDiGetClassDevs(guidDev, NULL, NULL, DIGCF_PRESENT | DIGCF_PROFILE);
TCHAR buffer [4000];
int memberIndex = 0;
while (true)
        {
        SP_DEVINFO_DATA deviceInfoData;
        ZeroMemory(&deviceInfoData, sizeof(SP_DEVINFO_DATA));
        deviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
        if (SetupDiEnumDeviceInfo(deviceInfoSet, memberIndex, &deviceInfoData) == FALSE)
                {
                if (GetLastError() == ERROR_NO_MORE_ITEMS)
                        {
                        break;
                        }
                }
        DWORD nSize=0 ;
        SetupDiGetDeviceInstanceId (deviceInfoSet, &deviceInfoData, buffer, sizeof(buffer), &nSize);
        buffer [nSize] ='\0';
        _tprintf (_T("%s\n"), buffer);
        memberIndex++;
        //Label1->Caption=String(buffer);
        if (String(buffer).SubString(1,8)=="USB\\VID_")
        ShowMessage(String(buffer));  // AnsiString dsa; dsa=dsa.SubString(dsa.Pos("USB\\"),)
        }
if (deviceInfoSet)
        {
        SetupDiDestroyDeviceInfoList(deviceInfoSet);
        }

}
//---------------------------------------------------------------------------