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PATH Hardware Documentation
> USB Devices
> Mac OS USB DDK API Reference
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The USBClosePipeByReference function closes the specified pipe currently opened. The pipe reference is deleted and no further reference can be made to it. All outstanding transactions on the specified pipe are returned with a kUSBAborted status.
OSStatus USBClosePipeByReference(USBPipeRef ref);
The USBClosePipeByReference function is similar to the pipe state control functions described later in this document. This function does not require a parameter block and does not complete asynchronously.
See also the USBFindNextPipe and USBOpenPipe functions.
The errors returned by the USBClosePipeByReference function include:
kUSBUnknownPipeErr
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-6997 | pipe reference not recognized |
The kUSBPipeStalledErr and kUSBPipeIdleErr are also returned if the pipe is not currently active. In this instance, the call has failed and the pipe will have to be activated again before it can be closed. This behavior will be changed to return noErr and succeed in a later release of the USB software.
kUSBPipeStalledErr
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-6979 | pipe is stalled, pipe not closed |
kUSBPipeIdleErr
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-6980 | pipe is idle, pipe not closed |
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