WinUSB释放设备句柄

完成对设备的全部所需调用后，需要释放设备的文件句柄和 WinUSB 接口句柄。 为此，请调用以下函数：

• CloseHandle 释放由 CreateFile 创建的句柄。
• WinUsb_Free释放设备的 WinUSB 接口句柄，该句柄由 WinUsb_Initialize。

VOID
CloseDevice(
    _Inout_ PDEVICE_DATA DeviceData
    )
/*++

Routine description:

    Perform required cleanup when the device is no longer needed.

    If OpenDevice failed, do nothing.

Arguments:

    DeviceData - Struct filled in by OpenDevice

Return value:

    None

--*/
{
    if (FALSE == DeviceData->HandlesOpen) {

        //
        // Called on an uninitialized DeviceData
        //
        return;
    }

    WinUsb_Free(DeviceData->WinusbHandle);
    CloseHandle(DeviceData->DeviceHandle);
    DeviceData->HandlesOpen = FALSE;

    return;
}