On Thursday, December 12, 2002, at 04:57 PM, Amanda Walker wrote: On 12/12/02 4:06 PM, Michael George <george@auroravideosys.com> wrote: This is what I was thinking of doing as a fallback. However, using "IOConnectMethod*()" I can pass scalars and structures. However, the data I want to pass in will be of arbitrary length, so I can't define that length in the getTargetAndMethodForIndex() data table. Set the length to 0xffffffff in the table. IOConnectMethod() can handle variable length buffers just fine. I don't think this is the case anymore. I tried it and I got some wild-high IOReturn value. I did some other tests and it seems that: If the size of the struct as defined in getTargetAndMethodForIndex() is too large (somewhere between 1Kb (which succeeded) and 512Kb (which failed)) I get 0xfffffecd as the result. It doesn't matter what size I really pass when I make the IOConnectMethod*() call. Needless to say, 0xffffffff is much bigger than .5Mb... It also seems that if the size for a structure I send in the IOConnectMethod*() calls isn't the same as the size declared in getTargetAndMethodForIndex(), then I get 0xe00002c2 (bad argument) back. Together, it seems that there is no way to pass arbitrary buffers through IOConnectMethod*() calls... Can anyone else confirm or correct this? -Michael _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.