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

[Stephan M. <ste...@we...>]

See http://www.nabble.com/Error-compiling-test-program-tf3508594.html#a9870106

> 
> 
> 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.
> 
> -- 
> View this message in context: http://www.nabble.com/libusb-with-borland-c-builder-tf3827103.html#a10833779
> Sent from the LibUSB Dev - Win32 mailing list archive at Nabble.com.
> 
> 
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