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(no subject)

hi!!!
i have just learned about mac usb driver programming and have encounteredsome problems thus could anyone help me out here?
i am currently developing a usb driver for a webcam. My question is how do i store the data of the webcam into a buffer after sending a control message? the control message is send thru control pipe while pipe one is used to read the data. do i send the control message over and then use a while loop to read the data and then store it into the buffer??
any opinon,views or help will be greatly appreciated!
thks!

code: do i do it like this?

void downLoadImage(IOUSBInterfaceInterface **interface,int size) //size-> refers to the size of the
{ picture
UInt8 buffer[size];
kern_return_t kernResult;
// int msg =0x1f500140;
IOUSBDevRequest req;
req.bmRequestType = USBmakebmRequestType(kUSBOut, kUSBVendor,kUSBDevice);
req.bRequest=0x1;
req.wValue=0x9300;
req.wIndex=0;
req.wLength=0;

     //  req.pData=msg;

		kernResult=(*interface)->ControlRequest(interface,0,&req);
		if (kernResult != kIOReturnSuccess)
		{
			//printf(“Unable to perform bulk write (%08x)\n”, kernResult);
			(void) (*interface)->USBInterfaceClose(interface);
			(void) (*interface)->Release(interface);

		}
		printf("downloading Image\n");
		UInt32 numBytesRead;
		numBytesRead = sizeof(gReadBuffer) - 1;

		while(sizeof(gReadBuffer)!=size)
		{

IOReturn kernaResult = (*interface)->ReadPipe( interface, 1, gReadBuffer,&numBytesRead);
if (kernaResult != kIOReturnSuccess)
{
printf("Unable to perform bulk read (%08x)\n", kernResult);
(void) (*interface)->USBInterfaceClose(interface);
(void) (*interface)->Release(interface);
//break;
}
printf("image dled %s (%ld bytes) from bulk endpoint\n", gReadBuffer);
}
}

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