Re: [Libusb-win32-devel] Error compiling test program

[Dan M. <dan...@gm...>]

I have this:

windows xp service pack 2
borland c++ builder version 6.0 (build 10.157)
libusb-win32 0.1.12.1

the thing is the precompiled program works fine with the hardware, giving me
all the info I can't get when I try to compile the program myself. that's
why I think it's a problem with the compiler. any ideas? thanks in advance.

Dan Leite Martins


On 4/3/07, Stephan Meyer <ste...@we...> wrote:
>
>
> This sound like an alignment problem.
> Some BC6 versions had serious bugs in the pshpack*.h files.
> Do you have the latest service pack installed?
>
> Stephan
>
>
> >
> > Hi there,
> >
> >
> > When trying to compile the example program [testlibusb_win.c], I get an
> error when I try to access the variables of the struct usb_config_descriptor
> > , which is been pointed by the variable struct usb_device *dev. The
> function,
> >
> >
> >   for (i = 0; i < dev->descriptor.bNumConfigurations; i++)
> >           print_configuration(&dev->config[i]);
> >
> >
> > passes a valid memory address, but all of its values are NULL. So when I
> try to run this function,
> >
> >
> >
> >   static void print_configuration(struct usb_config_descriptor *config)
> >   {
> >     int i;
> >
> >     edit_printf("  wTotalLength:         %d\r\n", config->wTotalLength);
> >
> >     edit_printf("  bNumInterfaces:       %d\r\n",
> config->bNumInterfaces);
> >     edit_printf("  bConfigurationValue:  %d\r\n",
> config->bConfigurationValue);
> >       edit_printf("  iConfiguration:       %d\r\n",
> config->iConfiguration);
> >
> >     edit_printf("  bmAttributes:         %02xh\r\n",
> config->bmAttributes);
> >     edit_printf("  MaxPower:             %d\r\n", config->MaxPower);
> >
> >
> >     for (i = 0; i < config->bNumInterfaces; i++)
> >       print_interface(&config->interface[i]);
> >   }
> >
> >
> > it stops on this line,
> >
> >
> >   edit_printf("  wTotalLength:         %d\r\n", config->wTotalLength);
> >
> >
> >
> > giving the following error message:
> >
> >
> >  Project raised exception EAccessViolation with message 'Access
> violation at address 00401A82. Read of address 00000035'. Process stopped.
> >
> >
> >
> > the address 00000035 is owned by the variable the program tried to
> access, config->wTotalLength.
> >
> >
> > If I don't use this struct, the program runs fine, but I don't get all
> the info the pre-compiled program gets, only Bus, Device, Vendor ID, Product
> ID, Manufacturer and Product.
> >
> >
> > Do you have an idea of why this is happening? Could be the compiler's
> fault? I'm using Borland C++ Builder 6's compiler. Any comments will be very
> welcomed. Thanks in advance,
> >
> >
> > Dan Leite Martins
> >
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