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代码如下(victor老大的代码几乎没有改动)
//---------------------------------------------------------------------------

#include
#pragma hdrstop

#include "Unit1.h"
#include
#include
#include
#include
#include
#include
#include
#include
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"


TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
// 下面必须为驱动程序的 GUID 值
DEFINE_GUID(USB_DRIVER_GUID, 0x36FC9E60,0xC465,0x11CF,0x80,0x56,0x44,0x45,0x53,0x54,0x00,0x00);
 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);
  SP_INTERFACE_DEVICE_DATA deviceInfoData;
  deviceInfoData.cbSize = sizeof (SP_INTERFACE_DEVICE_DATA);
  ULONG nGuessCount = MAXLONG;
  for(ULONG iDevIndex=0; iDevIndex   {
     if(SetupDiEnumDeviceInterfaces(hDevInfo, 0, pGuid, iDevIndex, &deviceInfoData))
      {
        if((hOut=OpenOneDevice(hDevInfo, &deviceInfoData, sDevNameBuf)) != INVALID_HANDLE_VALUE)
          break;
      }
     else if(GetLastError() == ERROR_NO_MORE_ITEMS) //No more items
      {
        break;
      }
   }
  SetupDiDestroyDeviceInfoList(hDevInfo);
  return hOut;
}
//---------------------------------------------------------------------------
bool GetUsbDeviceFileName(const GUID *pGuid, char *sDevNameBuf)
{
   HANDLE hDev = OpenUsbDevice(pGuid, sDevNameBuf);
  if(hDev != INVALID_HANDLE_VALUE)
   {
     CloseHandle(hDev);
     return true;
   }
  return false;
}
//---------------------------------------------------------------------------
HANDLE OpenMyDevice()
{
  char DeviceName[MAXPATH] = "";
  return OpenUsbDevice (&USB_DRIVER_GUID, DeviceName);
}
//---------------------------------------------------------------------------
  HANDLE OpenMyDevPipe(const char *PipeName)
{
  char DeviceName[MAXPATH] = "";
  if(GetUsbDeviceFileName(&USB_DRIVER_GUID, DeviceName))
   {
     strcat(DeviceName,"\\");
     strcat(DeviceName,PipeName);
     return CreateFile(DeviceName, GENERIC_WRITE|GENERIC_READ, FILE_SHARE_WRITE|FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);
   }
  return INVALID_HANDLE_VALUE;
}



void __fastcall TForm1::Button2Click(TObject *Sender)
{
     HANDLE hDevice=OpenMyDevice();
     if(hDevice !=INVALID_HANDLE_VALUE)
     {        ShowMessage("Usb Read success");
     }
     else    {
     ShowMessage("Usb Read fail");
     return; }
     CloseHandle(hDevice);

}
//---------------------------------------------------------------------------
最后我的运行结果都是"USB READ FAIL",也就是hDevice无法返回正确的值,高手们帮帮俺.快崩溃了.





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