awtk/docs/manual/data_writer_wbuffer_t.md
2021-01-11 08:23:05 +08:00

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## data\_writer\_wbuffer\_t
### 概述
![image](images/data_writer_wbuffer_t_0.png)
基于内存实现的 data_writer。通过 data_writer_factory 创建 writer 时URL的格式如下(请用函数data_writer_wbuffer_build_url生成)
```
wbuffer://addr
```
----------------------------------
### 函数
<p id="data_writer_wbuffer_t_methods">
| 函数名称 | 说明 |
| -------- | ------------ |
| <a href="#data_writer_wbuffer_t_data_writer_wbuffer_build_url">data\_writer\_wbuffer\_build\_url</a> | 构造wbuffer的URL。 |
| <a href="#data_writer_wbuffer_t_data_writer_wbuffer_create">data\_writer\_wbuffer\_create</a> | 创建基于wbuffer的data writer。 |
#### data\_writer\_wbuffer\_build\_url 函数
-----------------------
* 函数功能:
> <p id="data_writer_wbuffer_t_data_writer_wbuffer_build_url">构造wbuffer的URL。
* 函数原型:
```
const char* data_writer_wbuffer_build_url (wbuffer_t* wbuffer, char* url);
```
* 参数说明:
| 参数 | 类型 | 说明 |
| -------- | ----- | --------- |
| 返回值 | const char* | 返回URL。 |
| wbuffer | wbuffer\_t* | wbuffer对象。 |
| url | char* | 生成的URL。 |
#### data\_writer\_wbuffer\_create 函数
-----------------------
* 函数功能:
> <p id="data_writer_wbuffer_t_data_writer_wbuffer_create">创建基于wbuffer的data writer。
> 不要直接调用,而是注册到 data\_writer\_factory后通过data\_writer\_factory调用
* 函数原型:
```
data_writer_t* data_writer_wbuffer_create (const char* wbuffer_name);
```
* 参数说明:
| 参数 | 类型 | 说明 |
| -------- | ----- | --------- |
| 返回值 | data\_writer\_t* | 返回data writer对象。 |
| wbuffer\_name | const char* | wbuffer地址的字符串格式表示 。 |