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88 lines
1.8 KiB
Markdown
88 lines
1.8 KiB
Markdown
## 文件流扩展函数
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### 1.istream\_file\_create
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> 创建文件输入流对象。
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----------------------------
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#### 原型
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```js
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istream_file_create(filename, mode) => object
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```
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### 2.ostream\_file\_create
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> 创建文件输出流对象。
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----------------------------
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#### 原型
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```js
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ostream_file_create(filename, mode) => object
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```
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### 完整示例
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```js
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a = ostream_file_create("test.bin", "wb+")
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assert(ostream_write_uint8(a, 1) == 1)
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assert(ostream_write_int8(a, -1) == 1)
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assert(ostream_tell(a), 2)
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assert(ostream_write_uint16(a, 2) == 2)
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assert(ostream_write_int16(a, -2) == 2)
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assert(ostream_tell(a), 6)
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assert(ostream_write_uint32(a, 3) == 4)
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assert(ostream_write_int32(a, -3) == 4)
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assert(ostream_tell(a), 14)
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assert(ostream_write_uint64(a, 4) == 8)
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assert(ostream_write_int64(a, -4) == 8)
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assert(ostream_tell(a), 30)
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assert(ostream_write_float(a, 5) == 4)
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assert(ostream_write_double(a, -5) == 8)
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assert(ostream_tell(a), 42)
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assert(ostream_write_string(a, "hello") == 5)
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assert(ostream_write_binary(a, "world", 5) == 5)
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assert(ostream_tell(a), 52)
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assert(ostream_flush(a))
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a = istream_file_create("test.bin", "rb")
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assert(istream_read_uint8(a)==1)
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assert(istream_read_int8(a)==-1)
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assert(istream_tell(a), 2)
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assert(istream_read_uint16(a)==2)
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assert(istream_read_int16(a)==-2)
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assert(istream_tell(a), 6)
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assert(istream_read_uint32(a)==3)
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assert(istream_read_int32(a)==-3)
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assert(istream_tell(a), 14)
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assert(istream_read_uint64(a)==4)
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assert(istream_read_int64(a)==-4)
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assert(istream_tell(a), 30)
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assert(istream_read_float(a)==5)
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assert(istream_read_double(a)==-5)
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assert(istream_tell(a), 42)
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assert(istream_read_string(a, 5)=="hello")
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assert(istream_tell(a), 47)
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istream_read_binary(a, 5)
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assert(istream_tell(a), 52)
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assert(istream_seek(a, 0))
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assert(istream_read_uint8(a)==1)
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assert(istream_read_int8(a)==-1)
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assert(istream_tell(a) == 2)
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unset(a)
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```
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