C++Builder实现USB设备访问教程

#include <vcl.h>
#include <dir.h>
#include <setupapi.h>
#include "C:/WINDDK/3790/inc/ddk/w2k/usbdi.h"
#include "C:/WINDDK/3790/inc/ddk/w2k/devioctl.h"
#include <initguid.h>
//---------------------------------------------------------------------------
// DEFINE_GUID(USB_DRIVER_GUID, 0x12345678,0xabcd,0x1122,0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00);
//---------------------------------------------------------------------------
HANDLE OpenOneDevice(HDEVINFO hDvcInfo, PSP_INTERFACE_DEVICE_DATA DvcInfoData, char *sDevNameBuf)
{
  HANDLE hOut = INVALID_HANDLE_VALUE;
  ULONG  iReqLen = 0;
  SetupDiGetInterfaceDeviceDetail(hDvcInfo, DvcInfoData, NULL, 0, &iReqLen, NULL);
  ULONG iDevDataLen = iReqLen; //sizeof(SP_FNCLASS_DEVICE_DATA) + 512;
  PSP_INTERFACE_DEVICE_DETAIL_DATA pDevData = (PSP_INTERFACE_DEVICE_DETAIL_DATA)malloc(iDevDataLen);
  pDevData->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);
  if(SetupDiGetInterfaceDeviceDetail(hDvcInfo, DvcInfoData, pDevData, iDevDataLen, &iReqLen, NULL))
   {
     strcpy(sDevNameBuf, pDevData->DevicePath);
     hOut = CreateFile(pDevData->DevicePath, GENERIC_READ|GENERIC_WRITE, FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
   }
  free(pDevData);
  return hOut;
}
//---------------------------------------------------------------------------
HANDLE OpenUsbDevice(const GUID *pGuid, char *sDevNameBuf)
{
  HANDLE hOut = INVALID_HANDLE_VALUE;
  HDEVINFO hDevInfo = SetupDiGetClassDevs(pGuid, NULL, NULL, DIGCF_PRESENT|DIGCF_INTERFACEDEVICE);