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55 lines
1.4 KiB
Markdown
55 lines
1.4 KiB
Markdown
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## data\_writer\_t
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### 概述
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数据写入接口。
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>用于抽象flash等外部设备。
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----------------------------------
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### 函数
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<p id="data_writer_t_methods">
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| 函数名称 | 说明 |
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| -------- | ------------ |
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| <a href="#data_writer_t_data_writer_destroy">data\_writer\_destroy</a> | 销毁writer对象。 |
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| <a href="#data_writer_t_data_writer_write">data\_writer\_write</a> | 在指定位置写入数据。 |
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#### data\_writer\_destroy 函数
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-----------------------
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* 函数功能：
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> <p id="data_writer_t_data_writer_destroy">销毁writer对象。
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* 函数原型：
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```
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ret_t data_writer_destroy (data_writer_t* writer);
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```
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* 参数说明：
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| 参数 | 类型 | 说明 |
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| -------- | ----- | --------- |
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| 返回值 | ret\_t | 返回RET\_OK表示成功，否则表示失败。 |
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| writer | data\_writer\_t* | writer对象。 |
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#### data\_writer\_write 函数
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-----------------------
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* 函数功能：
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> <p id="data_writer_t_data_writer_write">在指定位置写入数据。
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* 函数原型：
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```
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int32_t data_writer_write (data_writer_t* writer, uint64_t offset, const void* data, uint32_t size);
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```
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* 参数说明：
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| 参数 | 类型 | 说明 |
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| -------- | ----- | --------- |
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| 返回值 | int32\_t | 返回实际读取数据的长度。 |
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| writer | data\_writer\_t* | writer对象。 |
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| offset | uint64\_t | 偏移量。 |
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| data | const void* | 数据缓冲区。 |
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| size | uint32\_t | 数据长度。 |
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