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20. High-level API Reference
YAPI
YAPI.PreregisterHub()
yPreregisterHub()
Fault-tolerant alternative to RegisterHub().
js
function yPreregisterHub(
url
,
errmsg
)
nodejs
function PreregisterHub(
url
,
errmsg
)
cpp
YRETCODE yPreregisterHub( const string&
url
, string&
errmsg
)
m
+(YRETCODE) PreregisterHub :(NSString *)
url
:(NSError**)
errmsg
pas
function yPreregisterHub(
url
: string, var
errmsg
: string): integer
vb
function yPreregisterHub( ByVal
url
As String,
ByRef
errmsg
As String) As Integer
cs
int PreregisterHub( string
url
, ref string
errmsg
)
java
int PreregisterHub( String
url
)
uwp
async Task<int> PreregisterHub( string
url
)
py
def PreregisterHub(
url
,
errmsg
=None)
php
function yPreregisterHub(
$url
,
&$errmsg
)
es
function PreregisterHub(
url
,
errmsg
)
This function has the same purpose and same arguments as
RegisterHub()
, but does not trigger
an error when the selected hub is not available at the time of the function call. This makes it possible to
register a network hub independently of the current connectivity, and to try to contact it only when a
device is actively needed.
Parameters :
url
a string containing either "usb","callback" or the root URL of the hub to monitor
errmsg
a string passed by reference to receive any error message.
Returns :
YAPI_SUCCESS
when the call succeeds.
On failure, throws an exception or returns a negative error code.
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149
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