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

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

I changed in the usb.h file 

/* ensure byte-packed structures */
#pragma pack(1)
#pragma pack(push)
#pragma pack(pop)
//#include <pshpack1.h> 

This made it work but I got some warnings that I have not yet managed to
solve I guess it have something to do how I am using the pragma I have not
figured out how the pragma pack works.


Dan Martins-2 wrote:
> 
> 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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