ADO Read 方法(ADO Read 方法)W3POP.COM

ADO Read 方法

作者:w3pop.com 翻译/整理:w3pop.com 发布:2007-04-28 浏览:1246 ::

The Read method is used to read the entire stream or a specified number of bytes from a binary Stream object and returns the resulting data as a variant.
Read的作用是：从一个二进制记录流对象中读出指定字节数的内容或整段记录流，并返回结果数据。

Note: This method is only used with binary Stream objects, for text Stream objects, use the ReadText method.
注意：这个方法仅用在二进制记录流对象中[binary Stream objects]；如果需要对文本记录流对象进行操作[text Stream objects]，那么需要使用ReadText方法。

Syntax
语法

var=objStream.Read numbytes

Parameter参数	Description描述
numbytes	Optional. The number of bytes to read from the file, or a StreamReadEnum value. Default is adReadAll 可选参数。指定从文件中或从一个StreamReadEnum值中读取的字节数。默认值为adReadAll If you have specified more than the number of bytes left in the Stream, only the bytes remaining are returned. 如果你所指定的数量大于整个记录流的数量，那么紧返回保留字节数

Parameter参数

Description描述

numbytes

Optional. The number of bytes to read from the file, or a StreamReadEnum value. Default is adReadAll
可选参数。指定从文件中或从一个StreamReadEnum值中读取的字节数。默认值为adReadAll

If you have specified more than the number of bytes left in the Stream, only the bytes remaining are returned.
如果你所指定的数量大于整个记录流的数量，那么紧返回保留字节数

StreamReadEnum Values

Constant常量	Value值	Description描述
adReadAll	-1	Default. Reads all bytes from the stream, from the current position to EOS. 默认值。读取记录流中从起始位置到末尾位置的所有字节 Note: This is the only valid value with binary Stream objects 注意：该常量仅在二进制记录流对象中有效

ADO Read 方法

Syntax 语法

StreamReadEnum Values

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Syntax
语法