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Re: usb novice question

On May 12, 2005, at 1:45 PM, Bob Kuehne wrote:

and from my understanding of this device, the second sub-interface is known as the alternate interface. the question is how do i access this in code? i can always find the first one, but i can't seem to figure out the right flavor of what i need to install in my requests 'bAlternateSetting' to get this to work. i know that i do have the right device (vendor and product ids match) matched. how do i select inteface 0, alternate setting 1?

i know, bad form, replying to yourself. but i suppose i'm glad i figured it out. writing the question sparked enough insight that i found it. here's the rest of the pseudocode:

my code snippet:

--
    request.bInterfaceClass = kIOUSBFindInterfaceDontCare;
    request.bInterfaceSubClass = kIOUSBFindInterfaceDontCare;
    request.bInterfaceProtocol = kIOUSBFindInterfaceDontCare;
    request.bAlternateSetting = kIOUSBFindInterfaceDontCare;

kernResult = (*device)->CreateInterfaceIterator(device,
&request, &iterator);
while (usbInterface = IOIteratorNext(iterator))
{
print( "%x\n", usbInterface );

// get plugin
kernResult = IOCreatePlugInInterfaceForService(usbInterface,
kIOUSBInterfaceUserClientTypeID,
kIOCFPlugInInterfaceID,
&plugInInterface, &score);
kernResult = IOObjectRelease(usbInterface);
// get plugin
result = (*plugInInterface)->QueryInterface(plugInInterface,
CFUUIDGetUUIDBytes(kIOUSBInterfaceInterfaceID),
&interface);
(*plugInInterface)->Release(plugInInterface);
kernResult = (*interface)->USBInterfaceOpen(interface);
IOReturn rr = (*interface)->SetAlternateInterface ( interface, 1 );

    }
--


this seems to get me what i need. any better ways of doing the same?

bob

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