📄 c-c+语言struct深层探索 - k的专栏 - csdnblog.htm
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<DIV class=postTitle><A
href="http://blog.csdn.net/fengyuruhui/archive/2007/07/08/1682509.aspx"><IMG
height=13 src="C-C+语言struct深层探索 - k的专栏 - CSDNBlog.files/zhuan.gif"
width=15 border=0> C/C+语言struct"深层"探索</A> </DIV>
<DIV class=postText>
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style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><FONT
face="Times New Roman"><STRONG style="mso-bidi-font-weight: normal"><SPAN
lang=EN-US
style="FONT-SIZE: 14pt; mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore">1.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN></STRONG><STRONG
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-SIZE: 14pt">struct</SPAN></STRONG></FONT><STRONG
style="mso-bidi-font-weight: normal"><SPAN
style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的巨大作用</SPAN></STRONG><STRONG
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-SIZE: 14pt"> </SPAN></STRONG></P>
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<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 24pt; mso-char-indent-count: 2.0"><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">面对一个人的大型</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT
face="Times New Roman">C/C++</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">程序时，只看其对</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT
face="Times New Roman">struct</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的使用情况我们就可以对其编写者的编程经验进行评估。因为一个大型的</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT
face="Times New Roman">C/C++</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">程序，势必要涉及一些</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT
face="Times New Roman">(</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">甚至大量</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT
face="Times New Roman">)</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">进行数据组合的结构体，这些结构体可以将原本意义属于一个整体的数据组合在一起。从某种程度上来说，会不会用</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT
face="Times New Roman">struct</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，怎样用</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT
face="Times New Roman">struct</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是区别一个开发人员是否具备丰富开发经历的标志。</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"> </SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在网络协议、通信控制、嵌入式系统的</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT
face="Times New Roman">C/C++</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">编程中，我们经常要传送的不是简单的字节流（</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT
face="Times New Roman">char</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">型数组），而是多种数据组合起来的一个整体，其表现形式是一个结构体。</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"> </SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">经验不足的开发人员往往将所有需要传送的内容依顺序保存在</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT
face="Times New Roman">char</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">型数组中，通过指针偏移的方法传送网络报文等信息。这样做编程复杂，易出错，而且一旦控制方式及通信协议有所变化，程序就要进行非常细致的修改。</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"> </SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一个有经验的开发者则灵活运用结构体，举一个例子，假设网络或控制协议中需要传送三种报文，其格式分别为</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT
face="Times New Roman">packetA</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT
face="Times New Roman">packetB</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT
face="Times New Roman">packetC</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">：</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"> </SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">struct structA </FONT></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">{ </FONT></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><SPAN
style="mso-tab-count: 1"></SPAN><FONT face="Times New Roman">int a;
</FONT></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><SPAN
style="mso-tab-count: 1"></SPAN><FONT face="Times New Roman">char b;
</FONT></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">}; </FONT></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">struct structB </FONT></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">{ </FONT></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><SPAN
style="mso-tab-count: 1"></SPAN><FONT face="Times New Roman">char a;
</FONT></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><SPAN
style="mso-tab-count: 1"></SPAN><FONT face="Times New Roman">short b;
</FONT></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">}; </FONT></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">struct structC </FONT></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">{ </FONT></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><SPAN
style="mso-tab-count: 1"></SPAN><FONT face="Times New Roman">int a;
</FONT></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><SPAN
style="mso-tab-count: 1"></SPAN><FONT face="Times New Roman">char b;
</FONT></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><SPAN
style="mso-tab-count: 1"></SPAN><FONT face="Times New Roman">float c;
</FONT></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">} </FONT></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">优秀的程序设计者这样设计传送的报文：</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"> </SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">struct CommuPacket </FONT></SPAN></P>
<P> </P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 18pt; mso-char-indent-count: 1.5"><SPAN
lang=EN-US
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