[Libusb-win32-devel] libusb with borland c-builder

[25an <man...@gm...>]

Hi!

I have just started to use the libusb-win32, I am trying to get it to work
with borland c-builder 6 on win XP.
If I run the test application testlibusb-win.exe It works just fine but when
I take the code and change it for the c-builder I get a problem no mather
what I do I cant read the configure descriptor in the usb_device struct the
code that I am using is this:

__fastcall TForm1::TForm1(TComponent* Owner)
  : TForm(Owner)
{
  //these method is called whene the GUI is created
  usb_init();
  usb_find_busses();
  usb_find_devices();
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{
  // whene button1 on the gui is pushed this method is executed
  version = usb_get_version();

  if(version)
  {
    line = "DLL version:\t";
    line += version->dll.major;
    line += ".";
    line += version->dll.minor;
    line += ".";
    line += version->dll.micro;
    line += ".";
    line += version->dll.nano;

    this->Memo1->Lines->Add(line);

    line = "Driver version:\t";
    line += version->driver.major;
    line += ".";
    line += version->driver.minor;
    line += ".";
    line += version->driver.micro;
    line += ".";
    line += version->driver.nano;

    this->Memo1->Lines->Add(line);
  }

  this->Memo1->Lines->Add("bus/device\t idVendor/idProduct");

  for (bus = usb_get_busses(); bus; bus = bus->next) {
    for (dev = bus->devices; dev; dev = dev->next) {
      int ret, i;
      char string[256];
      usb_dev_handle *udev;

      line = bus->dirname;
      line += "/";
      line += dev->filename;
      line += "\t";
      line += IntToHex(dev->descriptor.idVendor,1);
      line += "/";
      line += IntToHex(dev->descriptor.idProduct,1);

      this->Memo1->Lines->Add(line);

      udev = usb_open(dev);

      if (udev) {
        if (dev->descriptor.iManufacturer) {
          ret = usb_get_string_simple(udev, dev->descriptor.iManufacturer,
                                      string, sizeof(string));
          if (ret > 0) {
            line = "- Manufacturer : ";
            line += AnsiString(string);
            this->Memo1->Lines->Add(line);
          } else {
            this->Memo1->Lines->Add("- Unable to fetch manufacturer
string");
          }
        }

        if (dev->descriptor.iProduct) {
          ret = usb_get_string_simple(udev, dev->descriptor.iProduct,
string,
                                      sizeof(string));
          if (ret > 0) {
            line = "- Product : ";
            line += AnsiString(string);
            this->Memo1->Lines->Add(line);
          } else {
            this->Memo1->Lines->Add("- Unable to fetch product string");
          }
        }

        if (dev->descriptor.iSerialNumber) {
          ret = usb_get_string_simple(udev, dev->descriptor.iSerialNumber, 
                                      string, sizeof(string));
          if (ret > 0) {
            line = "- Serial number : ";
            line += AnsiString(string);
            this->Memo1->Lines->Add(line);
          } else {
            this->Memo1->Lines->Add("- Unable to fetch serial number
string");
          }
        }

        usb_close (udev);
      }

      if (!dev->config) {
        this->Memo1->Lines->Add("  Couldn't retrieve descriptors");
        continue;
      }

      i = 0;
      for (i = 0; i < dev->descriptor.bNumConfigurations; i++)
        print_configuration(&dev->config[i]);
    }
  }
}
//---------------------------------------------------------------------------
void TForm1::print_configuration(struct usb_config_descriptor *config)
{
  int i;
  //!!!!!!!The error occur here!!!!!!!!//
  unsigned short wtlength = config->wTotalLength; //<======== When I am
trying to get any variable in the configure descriptor

  line = "  wTotalLength:         ";
  line += wtlength;

  this->Memo1->Lines->Add(line);
 
}

the error that I get is accsses violation.

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