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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=gb2312"><title>famer: framer.cpp文件参考</title><link href="doxygen.css" rel="stylesheet" type="text/css"></head><body><!-- 制作者 Doxygen 1.3.9.1 --><div class="qindex"><a class="qindex" href="index.html">首页</a> | <a class="qindex" href="namespaces.html">名字空间列表</a> | <a class="qindex" href="files.html">文件列表</a> | <a class="qindex" href="globals.html">文件成员</a></div><h1>framer.cpp文件参考</h1>定义控制台应用程序的入口点。 <a href="#_details">更多...</a><p><code>#include "<a class="el" href="stdafx_8h-source.html">stdafx.h</a>"</code><br><code>#include "<a class="el" href="framer_8h-source.html">framer.h</a>"</code><br><table border="0" cellpadding="0" cellspacing="0"><tr><td></td></tr><tr><td colspan="2"><br><h2>Namespaces</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">namespace </td><td class="memItemRight" valign="bottom"><a class="el" href="namespacestd.html">std</a></td></tr><tr><td colspan="2"><br><h2>函数</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="framer_8cpp.html#a0">frameheader</a> (char *outfile, char *tempfile)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">形成帧的前导码、帧定界符、目的地址和源地址,输出到输出文件。. <a href="#a0"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="framer_8cpp.html#a1">length</a> (char *infile, char *tempfile)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">将输入文件的字节长度文件数据输出到临时文件，不足46字节的以0补齐。 <a href="#a1"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="framer_8cpp.html#a2">crc</a> (char *tempfile, char *outfile)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">根据临时文件计算crc校验码，并把计算结果和临时文件的数据输出到输出文件。 <a href="#a2"></a><br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="framer_8cpp.html#a3">_tmain</a> (int argc, _TCHAR *argv[])</td></tr></table><hr><a name="_details"></a><h2>详细描述</h2>定义控制台应用程序的入口点。 <p>: <hr><h2>函数文档</h2><a class="anchor" name="a3" doxytag="framer.cpp::_tmain"></a><p><table class="mdTable" width="100%" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">int _tmain </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">int </td> <td class="mdname" nowrap> <em>argc</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>_TCHAR * </td> <td class="mdname" nowrap> <em>argv</em>[]</td> </tr> <tr> <td class="md"></td> <td class="md">) </td> <td class="md" colspan="2"></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p><div class="fragment"><pre class="fragment">00178 {00179 <span class="keywordflow">if</span>(argc!=3) <span class="comment">//输入命令行参数不合要求，返回失败</span>00180 {00181 cout<<<span class="stringliteral">"USAGE:framer inputfile outputfile"</span><<endl;00182 cout<<<span class="stringliteral">"inputfile name:input1 || input2"</span><<endl;00183 <span class="keywordflow">return</span> 1;00184 }00185 00186 00187 00188 _TCHAR tname[20]; <span class="comment">//生成临时文件的名字 t+输出文件名 </span>00189 tname[0]=<span class="charliteral">'t'</span>;00190 <span class="keywordflow">for</span>(<span class="keywordtype">int</span> j=0;argv[2][j]!=<span class="charliteral">'\0'</span>;j++)00191 tname[j+1]=argv[2][j];00192 tname[j+1]=<span class="charliteral">'\0'</span>;00193 00194 00195 <span class="keywordflow">if</span>(<a class="code" href="framer_8h.html#a0">frameheader</a>(argv[2],tname)) <span class="comment">//生成帧头部的前导码、帧定界符、目的地址和源地址,输出到输出文件</span>00196 cout<<<span class="stringliteral">"frame header formed"</span><<endl;00197 <span class="keywordflow">else</span> <span class="comment">//失败则返回</span>00198 {00199 cout<<<span class="stringliteral">"frame header form failed"</span><<endl;00200 <span class="keywordflow">return</span> 1;00201 }00202 <span class="keywordflow">if</span>(<a class="code" href="framer_8h.html#a1">length</a>(argv[1],tname)) <span class="comment">//将输入文件的字节长度、文件数据输出到临时文件，不足46字节的以0补齐。</span>00203 cout<<<span class="stringliteral">"data length count finished"</span><<endl;00204 <span class="keywordflow">else</span>00205 {00206 cout<<<span class="stringliteral">"data length count failed"</span><<endl;00207 <span class="keywordflow">return</span> 1;00208 }00209 <span class="keywordflow">if</span>(<a class="code" href="framer_8h.html#a2">crc</a>(tname,argv[2])) <span class="comment">//根据临时文件计算crc校验码，并把计算结果和临时文件的数据输出到输出文件。</span>00210 cout<<<span class="stringliteral">"crc finished"</span><<endl;00211 <span class="keywordflow">else</span>00212 {00213 cout<<<span class="stringliteral">"crc failed"</span><<endl;00214 <span class="keywordflow">return</span> 1;00215 }00216 00217 <span class="keywordflow">return</span> 0;00218 }</pre></div><p> </td> </tr></table><a class="anchor" name="a2" doxytag="framer.cpp::crc"></a><p><table class="mdTable" width="100%" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">bool crc </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">char * </td> <td class="mdname" nowrap> <em>tempfile</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>char * </td> <td class="mdname" nowrap> <em>outfile</em></td> </tr> <tr> <td class="md"></td> <td class="md">) </td> <td class="md" colspan="2"></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>根据临时文件计算crc校验码，并把计算结果和临时文件的数据输出到输出文件。 <p><dl compact><dt><b>参数:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>char*</em> </td><td>tempfile 临时文件名 </td></tr> <tr><td valign="top"></td><td valign="top"><em>char*</em> </td><td>outfile 输出文件名 </td></tr> </table></dl><dl compact><dt><b>返回:</b></dt><dd>输出成功，则返回真。</dd></dl><div class="fragment"><pre class="fragment">00107 {00108 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> <a class="code" href="framer_8cpp.html#a2">crc</a> = 0x00; <span class="comment">//crc校验码值（寄存器），初始化为0。</span>00109 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> gx = 0x07; <span class="comment">//对应于G(x)=x8+x2+x1+x0</span>00110 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> oput = 0; <span class="comment">//每次左移时，移出的一位</span>00111 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> temp;00112 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> otemp;00113 00114 ifstream tfile(tempfile,ios::binary);00115 <span class="keywordflow">if</span>(!tfile) <span class="comment">//临时文件无法打开，返回失败</span>00116 {00117 cout<<<span class="stringliteral">"cannot open file"</span>;00118 <span class="keywordflow">return</span> <span class="keyword">false</span>;00119 }00120 00121 tfile.seekg(0,ios_base::end); <span class="comment">//寻找临时文件尾</span>00122 <span class="keywordtype">int</span> cnt=tfile.tellg(); <span class="comment">//获得临时文件长</span>00123 cnt=cnt-7; <span class="comment">//7字节前导码、1字节帧定界符不用于计算crc但还要加上crc位本身</span>00124 <span class="keywordtype">int</span> cnt2=cnt;00125 tfile.seekg(8); <span class="comment">//从第9位开始读取</span>00126 00127 ofstream ofile( outfile,ios::app|ios_base::binary );00128 00129 tfile.read((<span class="keywordtype">char</span>*)&otemp,<span class="keyword">sizeof</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>));00130 <span class="keywordflow">while</span>(cnt>0) <span class="comment">//每次从临时文件中读取一字节，计算，然后写到输出文件</span>00131 { 00132 00133 cnt=cnt-1;00134 <span class="keywordflow">if</span>(cnt!=0) <span class="comment">//非crc位</span>00135 00136 {00137 temp=otemp;00138 ofile.put(otemp);00139 }00140 <span class="keywordflow">else</span>00141 temp=0; <span class="comment">//cnt=0即为crc位，crc位为0</span>00142 00143 00144 <span class="keywordtype">int</span> i=0;00145 <span class="keywordflow">while</span>(i<8) <span class="comment">//对每一位入寄存器计算</span>00146 {00147 oput = <a class="code" href="framer_8cpp.html#a2">crc</a> & 0x80; <span class="comment">//取上次计算crc的最高位，此次左移即为输出位；</span>00148 <a class="code" href="framer_8cpp.html#a2">crc</a> <<= 1; <span class="comment">//寄存器左移一位</span>00149 <span class="keywordflow">if</span> (temp & 0x80) <span class="comment">//每次取字节的最高位，作为输入，判断是否为0</span>00150 { 00151 <a class="code" href="framer_8cpp.html#a2">crc</a> |= 0x01; <span class="comment">//非0，则将crc最低位与1取或，即最低为取一，其它位不变，即将1移入</span>⌨️ 快捷键说明
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