取得系統中裝置例項路徑(Device Instance Path)

取得系統中裝置例項路徑(Device Instance Path)
利用API SetupDiGetClassDevs、SetupDiEnumDeviceInterfaces、SetupDiGetDeviceInterfaceDetail抓出指定的裝置資訊，以下範例為抓取Disk的裝置例項路徑

BOOL ListDeviceInstancePath()
{
  HDEVINFO hdev;
  DWORD idx;
  GUID guid = GUID_DEVINTERFACE_DISK;
  CString csDevicePath;
  BOOL bRet = TRUE;
  BOOL nStatus;
  DWORD dwSize = 0;

  hdev = SetupDiGetClassDevs( &guid,
                           NULL,
                           NULL,
                           DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
  if (hdev == INVALID_HANDLE_VALUE )
  {
    printf("ERROR : Unable to enumerate device.\n");
    return FALSE;
  }
  
  SP_DEVICE_INTERFACE_DATA  DeviceInterfaceData;
  DeviceInterfaceData.cbSize = sizeof(DeviceInterfaceData);
  
  for (idx = 0 ; SetupDiEnumDeviceInterfaces(hdev, NULL, &guid, idx, &DeviceInterfaceData); idx++)
  {
    nStatus = SetupDiGetDeviceInterfaceDetail(hdev, &DeviceInterfaceData, NULL, 0, &dwSize, NULL);
    if (!dwSize)
    {
      bRet = FALSE;
      printf("ERROR : SetupDiGetDeviceInterfaceDetail fial.\n");
      break;
    }
    
    PSP_DEVICE_INTERFACE_DETAIL_DATA pBuffer = (PSP_DEVICE_INTERFACE_DETAIL_DATA)malloc(dwSize);
    ZeroMemory(pBuffer, sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA));
    pBuffer->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);
    
    SP_DEVINFO_DATA DeviceInfoData = {sizeof(SP_DEVINFO_DATA)};
    nStatus = SetupDiGetDeviceInterfaceDetail(hdev, &DeviceInterfaceData, pBuffer, dwSize, &dwSize, &DeviceInfoData);
    if(!nStatus)
    {
      bRet = FALSE;
      printf("ERROR : SetupDiGetDeviceInterfaceDetail fial.\n");
      break;
    }
    csDevicePath = pBuffer->DevicePath;  
    csDevicePath.MakeUpper(); 
    printf("%s\n", csDevicePath);
  }
  SetupDiDestroyDeviceInfoList(hdev);
  
  return bRet;
}

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