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Provider.md 3.87 KB

# Provider<a name="ZH-CN_TOPIC_0000001054476501"></a>

## **Overview**<a name="section663067880191900"></a>

**Related Modules:**

[Broadcast](Broadcast.md)

**Description:**

Defines the provider of events and data of a topic.

## **Summary**<a name="section1487115097191900"></a>

## Data Fields<a name="pub-attribs"></a>

<a name="table1289206452191900"></a>
<table><thead align="left"><tr id="row984823785191900"><th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.1"><p id="p1804219399191900"><a name="p1804219399191900"></a><a name="p1804219399191900"></a>Variable Name</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.2"><p id="p2057048956191900"><a name="p2057048956191900"></a><a name="p2057048956191900"></a>Description</p>
</th>
</tr>
</thead>
<tbody><tr id="row408495216191900"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p590873746191900"><a name="p590873746191900"></a><a name="p590873746191900"></a><a href="Provider.md#afbce5ffb04137a55e45161a7ba8577b7">Publish</a> )(<a href="IUnknown.md">IUnknown</a> *iUnknown, const <a href="Broadcast.md#gaf03f5bc94cad32ab628a6cdee09b0542">Topic</a> *topic, uint8 *data, int16 len)</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p1186582569191900"><a name="p1186582569191900"></a><a name="p1186582569191900"></a>BOOL(*&nbsp;</p>
<p id="p1651551524191900"><a name="p1651551524191900"></a><a name="p1651551524191900"></a>Publishes events and data of a specified topic. </p>
</td>
</tr>
</tbody>
</table>

## **Details**<a name="section1379136952191900"></a>

## **Field Documentation**<a name="section1071721486191900"></a>

## Publish<a name="afbce5ffb04137a55e45161a7ba8577b7"></a>

```
BOOL(* Provider::Publish) ([IUnknown](IUnknown.md) *iUnknown, const [Topic](Broadcast.md#gaf03f5bc94cad32ab628a6cdee09b0542) *topic, uint8 *data, int16 len)
```

**Description:**

Publishes events and data of a specified topic.

The events or data is published by the publisher, sent to all consumers who have subscribed to the topic, and processed by the consumers.

**Parameters:**

<a name="table319141948191900"></a>
<table><thead align="left"><tr id="row999890591191900"><th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.1"><p id="p840475230191900"><a name="p840475230191900"></a><a name="p840475230191900"></a>Name</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.2"><p id="p439353547191900"><a name="p439353547191900"></a><a name="p439353547191900"></a>Description</p>
</th>
</tr>
</thead>
<tbody><tr id="row1788395504191900"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 ">iUnknown</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 ">Indicates external interface of the pub/sub feature. </td>
</tr>
<tr id="row1450382891191900"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 ">topic</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 ">Indicates the pointer to the topic to publish. </td>
</tr>
<tr id="row253019304191900"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 ">data</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 ">Indicates the pointer to the data to publish. </td>
</tr>
<tr id="row755808410191900"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 ">len</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 ">Indicates the length of the data to be published. The length must be the same as the <strong id="b1136706137191900"><a name="b1136706137191900"></a><a name="b1136706137191900"></a>data</strong> length. The caller must ensure the validity of this parameter. </td>
</tr>
</tbody>
</table>

**Returns:**

Returns  **TRUE**  if the topic is successfully published; returns  **FALSE**  otherwise.

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提交于 2020-09-08 10:08 . add OpenHarmony 1.0 baseline

Provider

Overview

Related Modules:

Description:

Defines the provider of events and data of a topic.

Summary

Data Fields

Variable Name

Description

Publish )(IUnknown *iUnknown, const Topic *topic, uint8 *data, int16 len)

BOOL(*

Publishes events and data of a specified topic.

Details

Field Documentation

Publish

BOOL(* Provider::Publish) ([IUnknown](IUnknown.md) *iUnknown, const [Topic](Broadcast.md#gaf03f5bc94cad32ab628a6cdee09b0542) *topic, uint8 *data, int16 len)

Description:

Publishes events and data of a specified topic.

The events or data is published by the publisher, sent to all consumers who have subscribed to the topic, and processed by the consumers.

Parameters:

Name	Description
iUnknown	Indicates external interface of the pub/sub feature.
topic	Indicates the pointer to the topic to publish.
data	Indicates the pointer to the data to publish.
len	Indicates the length of the data to be published. The length must be the same as the data length. The caller must ensure the validity of this parameter.

Returns:

Returns TRUE if the topic is successfully published; returns FALSE otherwise.

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