如何在Mac中获取USB设备的设备描述符和配置描述符？

Question

我最少接触xcode和I/Okit框架.我在USB探测器中看到了USB设备的设备描述符和配置描述符.

我已经使用I/O工具包框架编写了一个xcode程序,当我们将该设备的产品ID和供应商ID作为输入时,它将usb设备名称作为输出.

/*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;

}

我需要对此进行修改,以便在给出usb设备的供应商和产品ID时,我将获得设备描述符和配置描述符(如USB prober中所示)作为输出.

这里我举了一个例子,代码可以改变,但输出必须是描述符(至少是设备描述符).

提前致谢...

Answer 1

我想你应该下载USBProber的源代码,而不是自己搞清楚.

通过分析源代码,USBProber中提供的所有信息迟早都可以得到.

这里是下载IOUSBFamily源代码的链接,里面有USBProber. http://opensource.apple.com/tarballs/IOUSBFamily/