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PeerFinder.Start() | start() Method

启动查找对等类应用程序的过程并使远程对等类能够发现应用程序。

语法


Windows.Networking.Proximity.PeerFinder.start();

参数

此 方法 没有参数。

备注

可以调用 Start 方法来开始查找对等类应用程序处理并使您可检测到的应用程序为调用 FindAllPeersAsync 方法的远程对等类。 对等类是使用匹配 AppId 在前台运行应用程序的计算机。对等类也可以具有一个指定为替代标识的匹配浏览 ID。有关更多信息,请参见 AlternateIdentities

您一次只能连接到一台同级。

当经轻拍周围的设备激活应用程序时,启动参数指示 PeerFinder 是否应开始,或者 如果应用程序生成了启动参数。有关更多信息,请参见支持接近程度和轻击中的“使用接近程度激活应用程序”部分。

重要事项  

始终将 DisplayName 属性设置为应用程序的唯一值,然后再调用 Start 方法。

Windows Phone 8

Wi-Fi Direct 在 Windows Phone 8 上不支持。有关更多信息,请参见邻近感应

示例


var started = false;

// Click event for "Advertise" button.
function advertiseForPeers(launchedFromTap) {
    Windows.Networking.Proximity.PeerFinder.displayName = displayNameTextBox.Text;

    if (Windows.Networking.Proximity.PeerFinder.supportedDiscoveryTypes &
        Windows.Networking.Proximity.PeerDiscoveryTypes.triggered) {

        Windows.Networking.Proximity.PeerFinder.addEventListener(
            "triggeredconnectionstatechanged", triggeredConnectionStateChanged);

        id("messageDiv").innerHTML +=
            "You can tap to connect a peer device that is " +
            "also advertising for a connection.<br />";
    } else {
        id("messageDiv").innerHTML +=
            "Tap to connect is not supported.<br />";
    }

    if (!launchedFromTap) {
        if (!(Windows.Networking.Proximity.PeerFinder.SupportedDiscoveryTypes &
              Windows.Networking.Proximity.PeerDiscoveryTypes.Browse)) {
            id("messageDiv").innerHTML +=
                "Peer discovery using Wi-Fi Direct is not supported.<br />";
        }
    }

    if (!started) {
        Windows.Networking.Proximity.PeerFinder.start();
        started = true;
    }
}

function triggeredConnectionStateChanged(e) {
    if (e.state === Windows.Networking.Proximity.TriggeredConnectState.peerFound) {
        id("messageDiv").innerHTML +=
            "Peer found. You may now pull your devices out of proximity.<br />";
    }
    if (e.state === Windows.Networking.Proximity.TriggeredConnectState.completed) {
        id("messageDiv").innerHTML += "Connected. You may now send a message.<br />";
        sendMessage(e.socket);
    }
}


// Click event for "Browse" button.
function findPeers() {
    if (Windows.Networking.Proximity.PeerFinder.supportedDiscoveryTypes &
        Windows.Networking.Proximity.PeerDiscoveryTypes.browse) {

        Windows.Networking.Proximity.PeerFinder.findAllPeersAsync().done(
    function (peerInfoCollection) {
        if (peerInfoCollection.length > 0) {
            // Connect to first peer found - example only.
            // In your app, provide the user with a list of available peers.
            connectToPeer(peerInfoCollection[0]);
        }
    },
    function (err) {
        id("messageDiv").innerHTML += "Error finding peers: " + err + "<br />";
    });
    } else {
        id("messageDiv").innerHTML +=
        "Peer discovery using Wi-Fi Direct is not supported.<br />";
    }
}

function connectToPeer(peerInfo) {
    id("messageDiv").innerHTML += ("Peer found. Connecting to " + peerInfo.displayName + "<br />");
    Windows.Networking.Proximity.PeerFinder.connectAsync(peerInfo).done(
        function (socket) {
            id("messageDiv").innerHTML += "Connection successful. You may now send messages.<br />";
            sendMessage(socket);
        },
        function (err) {
            id("messageDiv").innerHTML += "Connection failed: " + err + "<br />";
        });

    requestingPeer = null;
}

function stopFindingPeers() {
    Windows.Networking.Proximity.PeerFinder.stop();
    started = false;
    if (proximitySocket != null) { closeSocket(); }
}

// Handle external connection requests.
var requestingPeer;

function connectionRequested(e) {
    id("messageDiv").innerHTML +=
        "Connection requested by " + e.peerInformation.DisplayName + ". " +
        "Click 'Accept Connection' to connect.";
    requestingPeer = e.PeerInformation;
}

function acceptConnection() {
    if (requestingPeer == null) {
        id("messageDiv").innerHTML += "No peer connection has been requested.";
        return;
    }

    connectToPeer(requestingPeer);
}


要求

最低支持客户端

Windows 8

最低支持服务器

Windows Server 2012

最低支持电话

Windows Phone 8

命名空间

Windows.Networking.Proximity
Windows::Networking::Proximity [C++]

元数据

Windows.winmd

Capabilities

proximity
ID_CAP_PROXIMITY [Windows Phone]
ID_CAP_NETWORKING [Windows Phone]

另请参见

AlternateIdentities
PeerFinder
Start(String)
接近程度和轻击 (JavaScript)
接近程度和轻击 (C#/VB/C++)
示例
接近程度示例

 

 

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