subject_28001.htm

一些关于vc的问答

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序号：28001 发表者：liujc 发表日期：2003-01-17 09:10:16
<br>主题：菜问题
<br>内容：请教各位，比如我想将整个文件从串口送出，并且希望人为的判断遇到某些字符送某些字符不送，我想要用到指针的，但不知道如何将指针指向文档中的字符，能不能指教一下？多谢！
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回复者：bird 回复日期：2003-01-17 09:14:44
<br>内容：SetFilePointer()控制文件的读写指针的位置<BR>ReadFile()读文件到buffer!<BR>
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回复者：liujc 回复日期：2003-01-17 10:20:32
<br>内容：不好意思本人比较菜，还要再请教<BR>比如说我想将c:\re\re.txt中的文件发送出去，里面遇到字符c,o,m都不发送，其余的都发出去，能不能粗略的给我几行代码，让我的思路再清晰一些，感谢！
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<font color=red>答案被接受</font><br>回复者：天才 回复日期：2003-01-18 12:33:07
<br>内容：我觉得不考虑效率的话，假如文件较小，可以先用一个类将内容读出来，然后再用另外一个类将内容中的不需要的字母去掉，最后再用发送的类发送出去。<BR><BR>//读文件的类<BR>class ReadFileText<BR>{<BR>public:<BR>&nbsp;&nbsp;&nbsp;&nbsp;ReadFileText() {m_pcContent=0;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;virtual ~ReadFileText() {delete m_pcContent;m_pcContent=0;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;bool read(const char* pcFileName)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/*m_pcContent=content of file pcFileName*/<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;const char* getContent() const {return m_pcContent;}<BR>private:<BR>&nbsp;&nbsp;&nbsp;&nbsp;char* m_pcContent;//具体内容<BR>};<BR>//去字符的类<BR>#include &lt;set&gt;<BR>class DelChar<BR>{<BR>public:<BR>&nbsp;&nbsp;&nbsp;&nbsp;DelChar() {m_pcContent=0;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;virtual ~DelChar() {delete m_pcContent;m_pcContent=0;}<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;//剔除补需要的字符<BR>&nbsp;&nbsp;&nbsp;&nbsp;const char* generateDelResult(const char* pcContent)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/*m_pcContent=pcContent except char in m_setChar*/<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;//add need delete char to set<BR>&nbsp;&nbsp;&nbsp;&nbsp;void addDelChar(char c) {m_setChar.insert(c);}<BR>private:<BR>&nbsp;&nbsp;&nbsp;&nbsp;char* m_pcContent;<BR>&nbsp;&nbsp;&nbsp;&nbsp;std::set&lt;char&gt; m_setChar;//需去掉的字符集合<BR>};<BR>//发送的类了<BR>class SendString<BR>{<BR>public:<BR>&nbsp;&nbsp;&nbsp;&nbsp;virtual send(const char* pcContent);<BR>};<BR><BR>void main(void)<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;ReadFileText l_RFT;<BR>&nbsp;&nbsp;&nbsp;&nbsp;DelChar l_DC;<BR>&nbsp;&nbsp;&nbsp;&nbsp;SendString l_SS;<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;if(!l_RFT.read("c:\\re\\re.txt"))<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//failed<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;l_DC.addDelChar('c');<BR>&nbsp;&nbsp;&nbsp;&nbsp;l_DC.addDelChar('o');<BR>&nbsp;&nbsp;&nbsp;&nbsp;l_DC.addDelChar('m');<BR>&nbsp;&nbsp;&nbsp;&nbsp;l_SS.send(l_DC.generateDelResult(l_RFT.getContent()));<BR>}<BR>2003-1-18 12:43:56