ProximityDevice.PublishMessage 方法

参考

定义

命名空间:: Windows.Networking.Proximity

重要

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重载

PublishMessage(String, String)	将消息发布到指定消息类型的订阅者。
PublishMessage(String, String, MessageTransmittedHandler)	将消息发布到指定消息类型的订阅者。传输消息后，将调用指定的处理程序。

PublishMessage(String, String)

编辑

将消息发布到指定消息类型的订阅者。

public:
 virtual long long PublishMessage(Platform::String ^ messageType, Platform::String ^ message) = PublishMessage;

/// [Windows.Foundation.Metadata.Overload("PublishMessage")]
long PublishMessage(winrt::hstring const& messageType, winrt::hstring const& message);

[Windows.Foundation.Metadata.Overload("PublishMessage")]
public long PublishMessage(string messageType, string message);

function publishMessage(messageType, message)

Public Function PublishMessage (messageType As String, message As String) As Long

参数

messageType: String
Platform::String

winrt::hstring

要传递给订阅者的消息类型。

message: String
Platform::String

winrt::hstring

要传递给订阅者的消息。

Int64

long long

long

已发布消息的唯一发布 ID。将此值传递给 StopPublishingMessage 方法以停止发布消息。

属性: OverloadAttribute

Windows 要求

应用功能	ID_CAP_PROXIMITY [Windows Phone] proximity ID_CAP_PROXIMITY [Windows Phone]

示例

Windows.Networking.Proximity.ProximityDevice proximityDevice;
long publishedMessageId = -1;
long subscribedMessageId = -1;

private void initializeProximityDevice()
{
    proximityDevice = Windows.Networking.Proximity.ProximityDevice.GetDefault();

    if (proximityDevice != null)
    {
        PublishMessageButton.Click += PublishMessage;
        SubscribeForMessageButton.Click += SubscribeForMessage;
        StopSubscribingForMessageButton.Click += StopSubscribingForMessage;
        StopPublishingMessageButton.Click += StopPublishingMessage;
    }
    else
    {
        WriteMessageText("Failed to initialized proximity device.\n");
    }
}

private void PublishMessage(object sender, RoutedEventArgs e)
{
    // Stop publishing the current message.
    if (publishedMessageId != -1)
    {
        proximityDevice.StopPublishingMessage(publishedMessageId);
    }

    publishedMessageId = 
        proximityDevice.PublishMessage("Windows.SampleMessage", MessageTextBlock.Text);
}

private void SubscribeForMessage(object sender, RoutedEventArgs e)
{
    // Only subscribe for the message one time.
    if (subscribedMessageId == -1)
    {
        subscribedMessageId = 
        proximityDevice.SubscribeForMessage("Windows.SampleMessage", messageReceived);
    }
}

private void messageReceived(
    Windows.Networking.Proximity.ProximityDevice device, 
    Windows.Networking.Proximity.ProximityMessage message)
{
    MessageBlock.Text += "Message received: " + message.DataAsString + "\n";
}

private void StopSubscribingForMessage(object sender, RoutedEventArgs e)
{
    proximityDevice.StopSubscribingForMessage(subscribedMessageId);
    subscribedMessageId = -1;
}

private void StopPublishingMessage(object sender, RoutedEventArgs e)
{
    proximityDevice.StopPublishingMessage(publishedMessageId);
    publishedMessageId = -1;
}

// Write a message to MessageBlock on the UI thread.
private Windows.UI.Core.CoreDispatcher messageDispatcher = Window.Current.CoreWindow.Dispatcher;

async private void WriteMessageText(string message, bool overwrite = false)
{
    await messageDispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal,
        () =>
        {
            if (overwrite)
                MessageBlock.Text = message;
            else
                MessageBlock.Text += message;
        });
}

Private proximityDevice As Windows.Networking.Proximity.ProximityDevice
Private publishedMessageId As Long = -1
Private subscribedMessageId As Long = -1

Private Sub initializeProximityDevice()
    proximityDevice = Windows.Networking.Proximity.ProximityDevice.GetDefault()

    If proximityDevice IsNot Nothing Then
        AddHandler PublishMessageButton.Click, AddressOf PublishMessage
        AddHandler SubscribeForMessageButton.Click, AddressOf SubscribeForMessage
        AddHandler StopSubscribingForMessageButton.Click, AddressOf StopSubscribingForMessage
        AddHandler StopPublishingMessageButton.Click, AddressOf StopPublishingMessage
    Else
        WriteMessageText("Failed to initialized proximity device." & vbTab)
    End If
End Sub

Private Sub PublishMessage(sender As Object, e As RoutedEventArgs)
    ' Stop publishing the current message.
    If publishedMessageId <> -1 Then
        proximityDevice.StopPublishingMessage(publishedMessageId)
    End If

    publishedMessageId =
        proximityDevice.PublishMessage("Windows.SampleMessage", MessageTextBlock.Text)
End Sub

Private Sub SubscribeForMessage(sender As Object, e As RoutedEventArgs)
    ' Only subscribe for the message one time.
    If subscribedMessageId = -1 Then
        subscribedMessageId =
        proximityDevice.SubscribeForMessage("Windows.SampleMessage", AddressOf messageReceived)
    End If
End Sub

Private Sub messageReceived(
    device As Windows.Networking.Proximity.ProximityDevice,
    message As Windows.Networking.Proximity.ProximityMessage)

    MessageBlock.Text &= "Message received: " & message.DataAsString & vbTab
End Sub

Private Sub StopSubscribingForMessage(sender As Object, e As RoutedEventArgs)
    proximityDevice.StopSubscribingForMessage(subscribedMessageId)
    subscribedMessageId = -1
End Sub

Private Sub StopPublishingMessage(sender As Object, e As RoutedEventArgs)
    proximityDevice.StopPublishingMessage(publishedMessageId)
    publishedMessageId = -1
End Sub

' Write a message to MessageBlock on the UI thread.
Private Async Sub WriteMessageText(message As String, Optional overwrite As Boolean = False)
    Await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal,
        Sub()
            If overwrite Then
                MessageBlock.Text = message
            Else
                MessageBlock.Text &= message
            End If
        End Sub)
End Sub

注解

可以使用 SubscribeForMessage 方法订阅已发布的消息。

消息将继续发布，直到调用 StopPublishingMessage 方法或释放 ProximityDevice 对象为止。

消息将传递到订阅消息类型 (的所有应用程序，如 messageType 参数) 所示。消息类型值是区分大小写的字符串，由两部分组成：协议和子类型。 协议先是，后跟一个点 (.) ，然后是子类型。对于 PublishMessage 方法，协议必须始终为“Windows”。 子类型是字母数字字符和以下附加字符的字符串： . ( ) + ， - ： = @ ; $ _ ！ * '。 子类型长度不能超过 250 个字符。

若要使用其他消息类型（如“WindowsMime.”或“NDEF：WriteTag”）发布消息，必须使用 PublishBinaryMessage 方法。

可以使用 PublishUriMessage 方法将统一资源标识符 (URI) 发布到近似计算机。

消息在传输之前会转换为 UTF-8 字符。

对于 UWP 应用，仅当调用应用位于前台时，发布和订阅才处于活动状态。

重要

邻近感应 API 不提供身份验证、加密或消息完整性。不要使用邻近感应来交换用户敏感信息，如密码、财务数据、短信、电子邮件、照片或政府 ID 号。

另请参阅

适用于

PublishMessage(String, String, MessageTransmittedHandler)

编辑

将消息发布到指定消息类型的订阅者。传输消息后，将调用指定的处理程序。

public:
 virtual long long PublishMessage(Platform::String ^ messageType, Platform::String ^ message, MessageTransmittedHandler ^ messageTransmittedHandler) = PublishMessage;

/// [Windows.Foundation.Metadata.Overload("PublishMessageWithCallback")]
long PublishMessage(winrt::hstring const& messageType, winrt::hstring const& message, MessageTransmittedHandler const& messageTransmittedHandler);

[Windows.Foundation.Metadata.Overload("PublishMessageWithCallback")]
public long PublishMessage(string messageType, string message, MessageTransmittedHandler messageTransmittedHandler);

function publishMessage(messageType, message, messageTransmittedHandler)

Public Function PublishMessage (messageType As String, message As String, messageTransmittedHandler As MessageTransmittedHandler) As Long

参数

messageType: String
Platform::String

winrt::hstring

要传递给订阅者的消息类型。

message: String
Platform::String

winrt::hstring

要传递给订阅者的消息。

messageTransmittedHandler: MessageTransmittedHandler

传输消息时要调用的处理程序。

Int64

long long

long

已发布消息的唯一发布 ID。

属性: OverloadAttribute

Windows 要求

应用功能	ID_CAP_PROXIMITY [Windows Phone] proximity ID_CAP_PROXIMITY [Windows Phone]

示例

    Windows.Networking.Proximity.ProximityDevice proximityDevice;
    long publishedMessageId = -1;
    long subscribedMessageId = -1;

    private void initializeProximityDevice()
    {
        proximityDevice = Windows.Networking.Proximity.ProximityDevice.GetDefault();

        if (proximityDevice != null)
        {
            PublishMessageButton.Click += PublishMessage;
            SubscribeForMessageButton.Click += SubscribeForMessage;
            StopSubscribingForMessageButton.Click += StopSubscribingForMessage;
            StopPublishingMessageButton.Click += StopPublishingMessage;
        }
        else
        {
            WriteMessageText("Failed to initialized proximity device.\n");
        }
    }

    private void PublishMessage(object sender, RoutedEventArgs e)
    {
        // Stop publishing the current message.
        if (publishedMessageId != -1)
        {
            proximityDevice.StopPublishingMessage(publishedMessageId);
        }

        publishedMessageId = 
            proximityDevice.PublishMessage("Windows.SampleMessage", MessageTextBlock.Text,
                                                   MessagePublished);
    }

private void MessagePublished(
    Windows.Networking.Proximity.ProximityDevice sender,
        long messageId)
    {
    // The message has been successfully published.
    }

    private void SubscribeForMessage(object sender, RoutedEventArgs e)
    {
        // Only subscribe for the message one time.
        if (subscribedMessageId == -1)
        {
            subscribedMessageId = 
            proximityDevice.SubscribeForMessage("Windows.SampleMessage", messageReceived);
        }
    }

    private void messageReceived(
        Windows.Networking.Proximity.ProximityDevice device, 
        Windows.Networking.Proximity.ProximityMessage message)
    {
        MessageBlock.Text += "Message received: " + message.DataAsString + "\n";
    }

    private void StopSubscribingForMessage(object sender, RoutedEventArgs e)
    {
        proximityDevice.StopSubscribingForMessage(subscribedMessageId);
        subscribedMessageId = -1;
    }

    private void StopPublishingMessage(object sender, RoutedEventArgs e)
    {
        proximityDevice.StopPublishingMessage(publishedMessageId);
        publishedMessageId = -1;
    }

    // Write a message to MessageBlock on the UI thread.
    private Windows.UI.Core.CoreDispatcher messageDispatcher = Window.Current.CoreWindow.Dispatcher;

    async private void WriteMessageText(string message, bool overwrite = false)
    {
        await messageDispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal,
            () =>
            {
                if (overwrite)
                    MessageBlock.Text = message;
                else
                    MessageBlock.Text += message;
            });
    }

Private proximityDevice As Windows.Networking.Proximity.ProximityDevice
Private publishedMessageId As Long = -1
Private subscribedMessageId As Long = -1

Private Sub initializeProximityDevice()
    proximityDevice = Windows.Networking.Proximity.ProximityDevice.GetDefault()

    If proximityDevice IsNot Nothing Then
        AddHandler PublishMessageButton.Click, AddressOf PublishMessage
        AddHandler SubscribeForMessageButton.Click, AddressOf SubscribeForMessage
        AddHandler StopSubscribingForMessageButton.Click, AddressOf StopSubscribingForMessage
        AddHandler StopPublishingMessageButton.Click, AddressOf StopPublishingMessage
    Else
        WriteMessageText("Failed to initialized proximity device." & vbTab)
    End If
End Sub

Private Sub PublishMessage(sender As Object, e As RoutedEventArgs)
    ' Stop publishing the current message.
    If publishedMessageId <> -1 Then
        proximityDevice.StopPublishingMessage(publishedMessageId)
    End If

    publishedMessageId =
        proximityDevice.PublishMessage("Windows.SampleMessage", MessageTextBlock.Text,
                                       AddressOf MessagePublished)
End Sub

Private Sub MessagePublished(
sender As Windows.Networking.Proximity.ProximityDevice,
    messageId As Long)

' The message has been successfully published.
End Sub

Private Sub SubscribeForMessage(sender As Object, e As RoutedEventArgs)
    ' Only subscribe for the message one time.
    If subscribedMessageId = -1 Then
        subscribedMessageId =
        proximityDevice.SubscribeForMessage("Windows.SampleMessage", AddressOf messageReceived)
    End If
End Sub

Private Sub messageReceived(
    device As Windows.Networking.Proximity.ProximityDevice,
    message As Windows.Networking.Proximity.ProximityMessage)

    MessageBlock.Text &= "Message received: " & message.DataAsString & vbTab
End Sub

Private Sub StopSubscribingForMessage(sender As Object, e As RoutedEventArgs)
    proximityDevice.StopSubscribingForMessage(subscribedMessageId)
    subscribedMessageId = -1
End Sub

Private Sub StopPublishingMessage(sender As Object, e As RoutedEventArgs)
    proximityDevice.StopPublishingMessage(publishedMessageId)
    publishedMessageId = -1
End Sub

' Write a message to MessageBlock on the UI thread.
Private Async Sub WriteMessageText(message As String, Optional overwrite As Boolean = False)
    Await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal,
        Sub()
            If overwrite Then
                MessageBlock.Text = message
            Else
                MessageBlock.Text &= message
            End If
        End Sub)
End Sub

注解

可以使用 SubscribeForMessage 方法订阅已发布的消息。

消息将继续发布，直到调用 StopPublishingMessage 方法或释放 ProximityDevice 对象为止。

若要使用其他消息类型（如“WindowsMime.”或“NDEF：WriteTag”）发布消息，必须使用 PublishBinaryMessage 方法。

可以使用 PublishUriMessage 方法将统一资源标识符 (URI) 发布到近似计算机。

消息在传输之前会转换为 UTF-8 字符。

对于 UWP 应用，仅当调用应用位于前台时，发布和订阅才处于活动状态。

重要

邻近感应 API 不提供身份验证、加密或消息完整性。不要使用邻近感应来交换用户敏感信息，如密码、财务数据、短信、电子邮件、照片或政府 ID 号。

另请参阅

适用于

通过

ProximityDevice.PublishMessage 方法

定义

重载

PublishMessage(String, String)

参数

返回

Windows 要求

示例

注解

另请参阅

适用于

PublishMessage(String, String, MessageTransmittedHandler)

参数

返回

Windows 要求

示例

注解

另请参阅

适用于

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