USBDev_API
USBDev_PipeClose(bulk_out_handle, &err);
if (err != ERROR_SUCCESS) {
/* $$$$ Handle the error. */
}
USBDev_Close(dev_handle, &err);
(6)
if (err != ERROR_SUCCESS) {
/* $$$$ Handle the error. */
}
12
Listing 12-4 USBDev_API Device and Pipe Management Example
L12-4(1)
Get the number of devices connected to the host under the specified GUID. A
GUID provides a mechanism for applications to communicate with a driver
assigned to devices in a class. The number of devices could be used in a loop
to open at once all the devices. In this example, one device is assumed.
L12-4(2)
Open the device by retrieving a general device handle. This handle will be
used for pipe management and communication.
L12-4(3)
Open a bulk pipe by retrieving a pipe handle. In the example, a bulk IN and a
OUT pipe are open. If the pipe does not exist for this device, an error is
returned. When opening a pipe, the interface number and alternate setting
number are specified. In the example, bulk IN and OUT pipes are part of the
default interface. Opening an
interrupt IN and OUT pipes with
USBDev_IntIn_Open() or USBDev_IntOut_Open() is similar to bulk IN and
OUT pipes.
L12-4(4)
Transferring data on the open pipes can take place now. The pipe
communication is describes in section 12-3-2 “Device Communication” on
page 218.
L12-4(5)
Close a pipe by passing the associated handle. The closing operation aborts
any transfer in progress for the pipe and frees any allocated resources.
L12-4(6)
Close the device by passing the associated handle. The operation frees any
allocated resources for this device. If a pipe has not been closed by the
application, this function will close any forgotten open pipes.
217
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