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Re: need desperate help!!

These are the fields defined in Chapter 9 of the USB Spec (this is where the standard requests are documented). You can download that spec from here:

http://www.usb.org/developers/docs

For vendor-specific requests, such as what you've shown below -- you will need the vendor documentation to tell you what to put in those fields. We certainly don't know.

Regards,

David Ferguson
USB Software Team
Apple Computer

At 6:40 PM -0800 1/6/05, She Jian, Chia wrote: 
thks barry for the invaluable advice!!!
sorry for bothering u guys again but then
was just wondering for the ControlRequest method, how
do i know the values of request.wValue,etc. i have
already read through the documentations but they are
kind of profound so could anyone explain a little more
in dept to me? Thanks!!! :-)


OUSBDevRequest   request;
char              *readbuffer;

request.bmRequestType = USBmakebmRequestType(kUSBIn,
kUSBVendor,
kUSBDevice);
request.bRequest = GET_LUM_CTL; //
request.wValue = BRIGHTNESS_FORMATTER; //
request.wIndex = 0;
request.wLength = 0;
request.pData = &readbuffer;

result = (*intf)->ControlRequest(intf, 0, &request);

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