Question

I have minimum exposure to xcode and I/Okit framework. I have seen device descriptor and configuration descriptor of a usb device in USB prober.

I have written an xcode program using I/O kit framework which gives the usb device name as output, when we give product id and vendor id of that device as input.

/*Take the vendor and product id from console*/

printf("\nEnter the vendor id : ");
scanf("%lx",&usbVendor);

printf("\nEnter the product id :");
scanf("%lx",&usbProduct);


/* Set up a matching dictionary for the class */
matchingDict = IOServiceMatching(kIOUSBDeviceClassName);
if (matchingDict == NULL)
{
    return -1; // fail
}
// Create a CFNumber for the idVendor and set the value in the dictionary
numberRef = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &usbVendor);
CFDictionarySetValue(matchingDict, 
                     CFSTR(kUSBVendorID), 
                     numberRef);
CFRelease(numberRef);

// Create a CFNumber for the idProduct and set the value in the dictionary
numberRef = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &usbProduct);
CFDictionarySetValue(matchingDict, 
                     CFSTR(kUSBProductID), 
                     numberRef);
CFRelease(numberRef);
numberRef = NULL;

/*Get an iterator.*/
kr = IOServiceGetMatchingServices(kIOMasterPortDefault, matchingDict, &iter);
if (kr != KERN_SUCCESS)
{
    return -1;// fail
}

/* iterate */
while ((device = IOIteratorNext(iter)))
{
    /*Display the device names */

    io_name_t       deviceName;
    kr = IORegistryEntryGetName(device, deviceName);
    if (KERN_SUCCESS != kr) {
        deviceName[0] = '\0';
    }


    printf("\ndeviceName:%s",deviceName);

    /*Free the reference taken before continuing to the next item */
    IOObjectRelease(device);
}

/*Release the iterator */
IOObjectRelease(iter);
return 0;

}

I need to modify this, so that on giving vendor and product id of usb device, i will get the device descriptor and configuration descriptor( as shown in USB prober) as output.

Here i just gave an example, code can change but the output must be the descriptor( atleast the device decriptor).

Thanks in advance…

Answer 1

I think u should download the source code of USBProber rather than figure it out by yourself.

All the information presents in the USBProber u could get sooner or later by analyzing the source code.

Here is link to download the source code of IOUSBFamily, with USBProber inside it.
http://opensource.apple.com/tarballs/IOUSBFamily/