# wx.startLocalServiceDiscovery(Object object)

Start from base library version 2.4.0. Please remaining backward compatible.

with Promise style call: Supported

Mini Program plugin: Support, need to Mini Program base library version no less than 2.15.0

Start searching the LAN. mDNS Service. The results of the search are passed through wx.onLocalService* Event returns.

# parameter

# Object object

attribute	type	Required	Introductions
serviceType	string	yes	Type of service to search for
success	function	no	Interface calls the successful callback function
fail	function	no	Interface calls failed callback functions
complete	function	no	Callback function at the end of an interface call (both successful and unsuccessful calls are executed)

# object.fail callback

# parameter

# Object res

attribute	type	Introductions
errMsg	string	Error message

res.errMsg Legal value

value	Introductions	Minimum version
invalid param	serviceType Empty
scan task already exist	In the present startLocalServiceDiscovery Is called again without stopping the search initiated startLocalServiceDiscovery

# sample code


    wx.startLocalServiceDiscovery({
      // The LAN that the phone is currently connected to has a _http._tcp. Type of service
      serviceType: '_http._tcp.',
      success: console.log,
      fail: console.log
    })

# Be careful

Due to changes in operating system-related capabilities, iOS WeChat Client 7.0.18 The version above is not available mDNS Related interfaces, Android version not affected
wx.startLocalServiceDiscovery Is a performance-consuming behavior. Here we go. 30 After seconds, it will automatically stop And execute wx.onLocalServiceDiscoveryStop Registered callback function.
In calling wx.startLocalServiceDiscovery In this search behavior to stop before launching the next wx.startLocalServiceDiscovery。 Stopping this search behavior involves calling the wx.stopLocalServiceDiscovery and 30 Seconds after automatic system stop This search.