加入收藏 | 设为首页 | 会员中心 | 我要投稿 李大同 (https://www.lidatong.com.cn/)- 科技、建站、经验、云计算、5G、大数据,站长网!
当前位置: 首页 > 编程开发 > asp.Net > 正文

AMF学习1数据类型

发布时间:2020-12-15 21:14:31 所属栏目:asp.Net 来源:网络整理
导读:AMF是Action Message Format协议的简称,AMF协议是Adobe公司自己的协议,主要用于数据交互和远程过程调用,在功能上相当于WebService,但是AMF与WebService中的XML不同的是AMF是二进制数据,而XML是文本数据,AMF的传输效率比XML高。AMF使用HTTP方式传输,目
Number 0×00 Boolean 0×01 String 0×02 Object 0×03 MovieClip 0×04 Not available in Remoting Null 0×05 Undefined 0×06 Reference 0×07 MixedArray 0×08 EndOfObject 0×09 See Object Array 0x0a Date 0x0b LongString 0x0c Unsupported 0x0dRecordset 0x0eRemoting,server-to-client only 0x0fTypedObject (Class instance) 0×10AMF3 data 0×11Sent by Flash player 9+
以上表列出了每种数据类型的表示方法,这样看并不容易理解,下面我就主要讲解一下常用的一些格式:
40 10 00 00 00 00 00 00就表示的是一个double数4.0,在C#中可以使用如下代码读取该数据:
1.Boolean对应的是.net中的bool类型,数据使用1字节表示,和C语言差不多,使用00表示false,使用01表示true。比如十六进制 01就表示true。
2.String相当于.net中的string类型,String所占用的空间有1个类型标识字节和2个表示字符串UTF8长度的字节加上字符串UTF8格式的内容组成。比如十六进制 73 68 61 6E 67 67 75 61表示的就是字符串,该字符串长8字节,字符串内容为73 68 61 6E 67 67 75 61,对应的就是“shanggua”。在C#中要读取字符串则使用:

3.Object在.net中对应的就是Hashtable,内容由UTF8字符串作为Key,其他AMF类型作为Value,该对象由3个字节:00 00 09来表示结束。C#中读取该对象使用如下方法:


<div class="level1">
<div style="border-right: #cccccc 1px solid; padding-right: 5px; padding-left: 4px; font-size: 13px; border-top: #cccccc 1px solid; padding-bottom: 4px; border-left: #cccccc 1px solid; width: 98%; word-break: break-all; padding-top: 4px; border-bottom: #cccccc 1px solid; background-color: #eeeeee">
<img align="top" src="/Images/OutliningIndicators/None.gif" alt=""><span style="color: #0000ff">private<span style="color: #000000">?Hashtable?ReadUntypedObject()<img id="Codehighlighter1_44_329_Open_Image" onclick="code_collapse_toggle(this);" align="top" src="/Images/OutliningIndicators/ExpandedBlockStart.gif" alt=""><img style="display: none" id="Codehighlighter1_44_329_Closed_Image" onclick="code_collapse_toggle(this);" align="top" src="/Images/OutliningIndicators/ContractedBlock.gif" alt="">??????<span style="border-right: #808080 1px solid; border-top: #808080 1px solid; border-left: #808080 1px solid; border-bottom: #808080 1px solid; display: none; background-color: #ffffff" id="Codehighlighter1_44_329_Closed_Text"><img src="https://www.52php.cn/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif" alt=""><span id="Codehighlighter1_44_329_Open_Text"><span style="color: #000000">{<img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">?????????Hashtable?hash?<span style="color: #000000">=<span style="color: #000000">?<span style="color: #0000ff">new<span style="color: #000000">?Hashtable();<img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">?????????<span style="color: #0000ff">string<span style="color: #000000">?key?<span style="color: #000000">=<span style="color: #000000">?ReadShortString();<img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">?????????<span style="color: #0000ff">for<span style="color: #000000">?(<span style="color: #0000ff">byte<span style="color: #000000">?type?<span style="color: #000000">=<span style="color: #000000">?ReadByte();?type?<span style="color: #000000">!=<span style="color: #000000">?<span style="color: #800080">9<span style="color: #000000">;?type?<span style="color: #000000">=<span style="color: #000000">?ReadByte())<img id="Codehighlighter1_207_299_Open_Image" onclick="code_collapse_toggle(this);" align="top" src="/Images/OutliningIndicators/ExpandedSubBlockStart.gif" alt=""><img style="display: none" id="Codehighlighter1_207_299_Closed_Image" onclick="code_collapse_toggle(this);" align="top" src="/Images/OutliningIndicators/ContractedSubBlock.gif" alt="">?????????<span style="border-right: #808080 1px solid; border-top: #808080 1px solid; border-left: #808080 1px solid; border-bottom: #808080 1px solid; display: none; background-color: #ffffff" id="Codehighlighter1_207_299_Closed_Text"><img src="https://www.52php.cn/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif" alt=""><span id="Codehighlighter1_207_299_Open_Text"><span style="color: #000000">{<img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">????????????hash.Add(key,?ReadData(type));<img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">????????????key?<span style="color: #000000">=<span style="color: #000000">?ReadShortString();<img align="top" src="/Images/OutliningIndicators/ExpandedSubBlockEnd.gif" alt="">?????????}<span style="color: #000000"><img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">?????????<span style="color: #0000ff">return<span style="color: #000000">?hash;<img align="top" src="/Images/OutliningIndicators/ExpandedBlockEnd.gif" alt="">??????}<span style="color: #000000">?<img align="top" src="/Images/OutliningIndicators/None.gif" alt=""><img align="top" src="/Images/OutliningIndicators/None.gif" alt="">

5.Null就是空对象,该对象只占用一个字节,那就是Null对象标识0x05。

<div style="border-right: #cccccc 1px solid; padding-right: 5px; padding-left: 4px; font-size: 13px; border-top: #cccccc 1px solid; padding-bottom: 4px; border-left: #cccccc 1px solid; width: 98%; word-break: break-all; padding-top: 4px; border-bottom: #cccccc 1px solid; background-color: #eeeeee">
<img align="top" src="/Images/OutliningIndicators/None.gif" alt=""><span style="color: #0000ff">private<span style="color: #000000">?Hashtable?ReadDictionary()<img id="Codehighlighter1_41_397_Open_Image" onclick="code_collapse_toggle(this);" align="top" src="/Images/OutliningIndicators/ExpandedBlockStart.gif" alt=""><img style="display: none" id="Codehighlighter1_41_397_Closed_Image" onclick="code_collapse_toggle(this);" align="top" src="/Images/OutliningIndicators/ContractedBlock.gif" alt="">??????<span style="border-right: #808080 1px solid; border-top: #808080 1px solid; border-left: #808080 1px solid; border-bottom: #808080 1px solid; display: none; background-color: #ffffff" id="Codehighlighter1_41_397_Closed_Text"><img src="https://www.52php.cn/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif" alt=""><span id="Codehighlighter1_41_397_Open_Text"><span style="color: #000000">{<img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">?????????<span style="color: #0000ff">int<span style="color: #000000">?size?<span style="color: #000000">=<span style="color: #000000">?ReadInt32();<img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">?????????Hashtable?hash?<span style="color: #000000">=<span style="color: #000000">?<span style="color: #0000ff">new<span style="color: #000000">?Hashtable(size);<img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">?????????<span style="color: #0000ff">string<span style="color: #000000">?key?<span style="color: #000000">=<span style="color: #000000">?ReadShortString();<img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">?????????<span style="color: #0000ff">for<span style="color: #000000">?(<span style="color: #0000ff">byte<span style="color: #000000">?type?<span style="color: #000000">=<span style="color: #000000">?ReadByte();?type?<span style="color: #000000">!=<span style="color: #000000">?<span style="color: #800080">9<span style="color: #000000">;?type?<span style="color: #000000">=<span style="color: #000000">?ReadByte())<img id="Codehighlighter1_241_367_Open_Image" onclick="code_collapse_toggle(this);" align="top" src="/Images/OutliningIndicators/ExpandedSubBlockStart.gif" alt=""><img style="display: none" id="Codehighlighter1_241_367_Closed_Image" onclick="code_collapse_toggle(this);" align="top" src="/Images/OutliningIndicators/ContractedSubBlock.gif" alt="">?????????<span style="border-right: #808080 1px solid; border-top: #808080 1px solid; border-left: #808080 1px solid; border-bottom: #808080 1px solid; display: none; background-color: #ffffff" id="Codehighlighter1_241_367_Closed_Text"><img src="https://www.52php.cn/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif" alt=""><span id="Codehighlighter1_241_367_Open_Text"><span style="color: #000000">{<img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">????????????<span style="color: #0000ff">object<span style="color: #000000">?value?<span style="color: #000000">=<span style="color: #000000">?ReadData(type);<img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">????????????hash.Add(key,?value);<img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">????????????key?<span style="color: #000000">=<span style="color: #000000">?ReadShortString();<img align="top" src="/Images/OutliningIndicators/ExpandedSubBlockEnd.gif" alt="">?????????}<span style="color: #000000"><img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">?????????<span style="color: #0000ff">return<span style="color: #000000">?hash;<img align="top" src="/Images/OutliningIndicators/ExpandedBlockEnd.gif" alt="">??????}<span style="color: #000000">?

10.Array对应的就是.net中的ArrayList对象,该对象首先使用32位整数定义了ArralyList的长度,然后是密集的跟着ArrayList中的对象,读取该对象使用如下函数:

11.Date对应.net中的DateTime数据类型,Date在类型标识符0x0B后使用double来表示从1970/1/1到表示的时间所经过的毫秒数,然后再跟一个ushort的16位无符号整数表示时区。读取Date类型的C#代码为:

<div style="border-right: #cccccc 1px solid; padding-right: 5px; padding-left: 4px; font-size: 13px; border-top: #cccccc 1px solid; padding-bottom: 4px; border-left: #cccccc 1px solid; width: 98%; word-break: break-all; padding-top: 4px; border-bottom: #cccccc 1px solid; background-color: #eeeeee">
<img align="top" src="/Images/OutliningIndicators/None.gif" alt=""><span style="color: #0000ff">private<span style="color: #000000">?DateTime?ReadDate()<img id="Codehighlighter1_33_265_Open_Image" onclick="code_collapse_toggle(this);" align="top" src="/Images/OutliningIndicators/ExpandedBlockStart.gif" alt=""><img style="display: none" id="Codehighlighter1_33_265_Closed_Image" onclick="code_collapse_toggle(this);" align="top" src="/Images/OutliningIndicators/ContractedBlock.gif" alt="">?????<span style="border-right: #808080 1px solid; border-top: #808080 1px solid; border-left: #808080 1px solid; border-bottom: #808080 1px solid; display: none; background-color: #ffffff" id="Codehighlighter1_33_265_Closed_Text"><img src="https://www.52php.cn/res/2019/02-14/22/a76e9bb6ed00cf1c9c9f4ee2f04b558b.gif" alt=""><span id="Codehighlighter1_33_265_Open_Text"><span style="color: #000000">{<img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">????????<span style="color: #0000ff">double<span style="color: #000000">?ms?<span style="color: #000000">=<span style="color: #000000">?ReadDouble();<img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">????????DateTime?BaseDate?<span style="color: #000000">=<span style="color: #000000">?<span style="color: #0000ff">new<span style="color: #000000">?DateTime(<span style="color: #800080">1970<span style="color: #000000">,?<span style="color: #800080">1<span style="color: #000000">,?<span style="color: #800080">1<span style="color: #000000">);<img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">????????DateTime?date?<span style="color: #000000">=<span style="color: #000000">?BaseDate.AddMilliseconds(ms);?????????<img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt="">????????ReadUInt16();?<span style="color: #008000">//<span style="color: #008000">get's?the?timezone?????????<span style="color: #008000"><img align="top" src="/Images/OutliningIndicators/InBlock.gif" alt=""><span style="color: #000000">????????<span style="color: #0000ff">return<span style="color: #000000">?date;<img align="top" src="/Images/OutliningIndicators/ExpandedBlockEnd.gif" alt="">?????}<span style="color: #000000">?

12.LongString对应的也是string类型,不过和2对应的String不同的是这里使用32位整数来表示字符串的UTF8长度,而String使用的是16位。

15.XML是使用类型标识符0x0F后直接跟LongString类型的字符串表示。

这里大部分代码我都是摘自AMF.net 一个开源的.net AMF序列化和反序列化的库,大家若有兴趣可以到 去下载。另外 这个英文网站也对AMF数据类型作了比较详细的介绍。

(编辑:李大同)

【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容!

AMF是Action Message Format协议的简称,AMF协议是Adobe公司自己的协议,主要用于数据交互和远程过程调用,在功能上相当于WebService,但是AMF与WebService中的XML不同的是AMF是二进制数据,而XML是文本数据,AMF的传输效率比XML高。AMF使用HTTP方式传输,目前主要是用于ActionScript中,即实现Flex和Server之间的通信。

我是做.Net开发的,按理说和AMF没有什么关系,主要是最近在耍一款网页游戏:纵横天下,该游戏就是采用Flex做的客户端,为了能够做出该游戏的挂机程序,所以才开始学习研究AMF的。闲话休说,言归正传,下面继续说AMF协议,在例子中我使用的AMF数据就是从纵横天下中抓取的AMF数据。

AMF目前有两种版本,AMF0和AMF3,他们在数据类型的定义上有细微不同。关于AMF的官方文档参见。

Type
Byte code Notes