2021-01-12 14:29:47 +08:00
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## iostream 扩展函数
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### 1.iostream\_get\_istream
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2021-09-09 15:10:12 +08:00
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> 获取输入流对象。
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----------------------------
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#### 原型
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```
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iostream_get_istream(iostream) => object
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```
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2021-01-12 14:29:47 +08:00
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### 2.iostream\_get\_ostream
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2021-09-09 15:10:12 +08:00
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> 获取输出流对象。
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----------------------------
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#### 原型
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```
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iostream _get_ostream(iostream) => object
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```
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2021-01-12 14:29:47 +08:00
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### 更多示例
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```js
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//
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// start serial echo server first
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// ./bin/serial_recv 4000
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//
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a = iostream_serial_create("/dev/ttys001", 0)
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b = iostream_get_ostream(a)
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c = iostream_get_istream(a)
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assert(ostream_write_uint32(b, 6) == 4)
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assert(ostream_write_string(b, "hello\n") == 6)
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assert(istream_read_uint32(c, 3000) == 6)
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assert(istream_read_string(c, 6, 3000) == "hello\n")
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unset(c)
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unset(b)
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unset(a)
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```
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