subject_36659.htm

一些关于vc的问答

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序号：36659 发表者：苦闷 发表日期：2003-04-17 15:21:25
<br>主题：不好意思，又来了。
<br>内容：void CTest1Dlg::OnChangeEdit1() <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;UpdateData();<BR>&nbsp;&nbsp;&nbsp;&nbsp;if(m_Edit1.GetLength()==4)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;CFile file;<BR>&nbsp;&nbsp;&nbsp;&nbsp;char *aa;<BR>&nbsp;&nbsp;&nbsp;&nbsp;int nIndex;<BR>&nbsp;&nbsp;&nbsp;&nbsp;file.Open("ccc.txt",CFile::modeWrite|CFile::modeRead);<BR>&nbsp;&nbsp;&nbsp;&nbsp;aa=new char[file.GetLength()];<BR>&nbsp;&nbsp;&nbsp;&nbsp;file.Read(aa,file.GetLength());<BR>&nbsp;&nbsp;&nbsp;&nbsp;aa[file.GetLength()] = '\0';<BR>&nbsp;&nbsp;&nbsp;&nbsp;CString strContext(aa);<BR>&nbsp;&nbsp;&nbsp;&nbsp;nIndex = strContext.Find(' ',0);//找到空格的位置<BR>&nbsp;&nbsp;&nbsp;&nbsp;strContext.Left(nIndex)=m_Edit1;//截取空格左边的字符串<BR>&nbsp;&nbsp;&nbsp;&nbsp;file.Write(aa,strlen(aa));<BR>&nbsp;&nbsp;&nbsp;&nbsp;file.Close();<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>}运行后，当输入4位数，就弹出了如下的提示框。<BR>2003-4-17 15:23:48