📄 c-c+语言struct深层探索 - k的专栏 - csdnblog.htm
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style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
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style="mso-tab-count: 1"></SPAN><FONT face="Times New Roman">int
iPacketType;</FONT></SPAN><SPAN
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style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">//</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-shading: white; mso-pattern: gray-15 auto">报文类型标志</SPAN><SPAN
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</SPAN></P>
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face="Times New Roman">union</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-shading: white; mso-pattern: gray-15 auto"> </SPAN><SPAN
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style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">//</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-shading: white; mso-pattern: gray-15 auto">每次传送的是三种报文中的一种，使用</SPAN><SPAN
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style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">union </FONT></SPAN></P>
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style="mso-tab-count: 1"></SPAN><FONT face="Times New Roman">{
</FONT></SPAN></P>
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</SPAN>struct structA packetA; </FONT></SPAN></P>
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</SPAN>struct structB packetB; </FONT></SPAN></P>
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</SPAN>struct structC packetC; </FONT></SPAN></P>
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style="mso-tab-count: 1"></SPAN><FONT face="Times New Roman">}
</FONT></SPAN></P>
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<P class=MsoNormal
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style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">}; </FONT></SPAN></P>
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<P class=MsoNormal
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style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在进行报文传送时，直接传送</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT face="Times New Roman">struct
CommuPacket</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'">一个整体。</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"> </SPAN></P>
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<P class=MsoNormal
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style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">假设发送函数的原形如下：</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"> </SPAN></P>
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<P class=MsoNormal
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lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">// pSendData</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-shading: white; mso-pattern: gray-15 auto">：发送字节流的首地址，</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">iLen</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-shading: white; mso-pattern: gray-15 auto">：要发送的长度</SPAN><SPAN
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</SPAN></P>
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style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">Send(char * pSendData, unsigned int<SPAN
style="mso-spacerun: yes"> </SPAN>iLen); </FONT></SPAN></P>
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<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'">发送方可以直接进行如下调用发送</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT face="Times New Roman">struct
CommuPacket</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'">的一个实例</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT
face="Times New Roman">sendCommuPacket</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>
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lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">Send( (char *)&sendCommuPacket ,
sizeof(CommuPacket) ); </FONT></SPAN></P>
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<P class=MsoNormal
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style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">假设接收函数的原形如下：</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"> </SPAN></P>
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<P class=MsoNormal
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style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">// pRecvData</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-shading: white; mso-pattern: gray-15 auto">：发送字节流的首地址，</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">iLen</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-shading: white; mso-pattern: gray-15 auto">：要接收的长度</SPAN><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
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lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">//</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-shading: white; mso-pattern: gray-15 auto">返回值：实际接收到的字节数</SPAN><SPAN
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</SPAN></P>
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<P class=MsoNormal
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style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">unsigned int Recv(char * pRecvData, unsigned
int<SPAN style="mso-spacerun: yes"> </SPAN>iLen)</FONT></SPAN><SPAN
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-shading: white; mso-pattern: gray-15 auto">；</SPAN><SPAN
lang=EN-US
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</SPAN></P>
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<P class=MsoNormal
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style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">接收方可以直接进行如下调用将接收到的数据保存在</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT face="Times New Roman">struct
CommuPacket</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'">的一个实例</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"><FONT
face="Times New Roman">recvCommuPacket</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'">中：</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"> </SPAN></P>
<P> </P>
<P class=MsoNormal
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lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">Recv( (char *)&recvCommuPacket ,
sizeof(CommuPacket) ); </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'">接着判断报文类型进行相应处理：</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 12pt"> </SPAN></P>
<P> </P>
<P class=MsoNormal
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lang=EN-US
style="FONT-SIZE: 12pt; BACKGROUND: #d9d9d9; mso-shading: white; mso-pattern: gray-15 auto"><FONT
face="Times New Roman">switch(recvCommuPacket. iPacketType)
</FONT></SPAN></P>
<P> </P>
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lang=EN-US
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face="Times New Roman">{ </FONT></SPAN></P>
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