subject_38086.htm

一些关于vc的问答

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序号：38086 发表者：maginn 发表日期：2003-04-30 16:25:57
<br>主题：我的结构定义那里错了？？
<br>内容：struct tegStudent<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;int nCode;<BR>&nbsp;&nbsp;&nbsp;&nbsp;char sName[10];<BR>&nbsp;&nbsp;&nbsp;&nbsp;int nAge;<BR>}STUDENT;<BR>bool mydialog::Copy2(CString strSource, CString strTarget)<BR>{<BR>CFile fSource;<BR>CFile fTarget;<BR>STUDENT s;&nbsp;&nbsp;<BR><BR>/*错现错误如下D:\my program\c\opendialg\mydialog.cpp(129) : error&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C2146: syntax error : missing ';' before identifier 's'<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D:\my program\c\opendialg\mydialog.cpp(129) : errorC2065: 's' :&nbsp;&nbsp; undeclared identifier<BR>*/<BR> int nCount;<BR> if (!fSource.Open(strSource,CFile::modeRead))<BR> {<BR>&nbsp;&nbsp;&nbsp;&nbsp; MessageBox("con't open file");<BR>&nbsp;&nbsp;&nbsp;&nbsp; return false;<BR> }<BR> if (!fTarget.Open(strTarget,CFile::modeCreate|CFile::modeWrite))<BR> {<BR>&nbsp;&nbsp;&nbsp;&nbsp; MessageBox("create target file fail");<BR>&nbsp;&nbsp;&nbsp;&nbsp; fSource.Close();<BR>&nbsp;&nbsp;&nbsp;&nbsp; return false;<BR> }<BR> nCount=fSource.Read(s,sizeof(STUDENT));&nbsp;&nbsp;//读文件<BR> while (nCount)<BR> {<BR>&nbsp;&nbsp;&nbsp;&nbsp; fTarget.Write(s,sizeof(STUDENT));//写文件<BR>&nbsp;&nbsp;&nbsp;&nbsp; nCount=fSource.Read(s,sizeof(STUDENT)); //？请问这句话有什么用阿？？<BR> }<BR> fSource.Close();<BR> fTarget.Close();<BR><BR><BR>} 
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<font color=red>答案被接受</font><br>回复者：张志民 回复日期：2003-04-30 17:52:48
<br>内容：struct tegStudent<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;int nCode;<BR>&nbsp;&nbsp;&nbsp;&nbsp;char sName[10];<BR>&nbsp;&nbsp;&nbsp;&nbsp;int nAge;<BR>}STUDENT;<BR>在这里 STUDENT只是struct tegStudent结构定义的一个变量，相当于<BR>struct tegStudent STUDENT；就像是int i, i是int类型的一个变量；<BR>STUDENT并不是结构体名称。<BR><BR>你要想使用STUDENT s;&nbsp;&nbsp;可以这样：<BR>typedef struct tegStudent STUDENT;<BR>STUDENT s;
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回复者：maginn 回复日期：2003-04-30 19:32:37
<br>内容：请问结构中<BR>class kkk{<BR>public<BR>int a;<BR>int b;<BR>}<BR>这样的结构和struct有什么区别阿？<BR><BR>还有<BR>typedef struct tegStudent STUDENT;<BR>STUDENT s;<BR>这句话直接写道函数中间就可以吗？<BR>
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回复者：DVC 回复日期：2003-04-30 20:22:52
<br>内容：定义一个CSTRING 然后在其字符的末端加"\r\n"就好了！ 
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回复者：moli 回复日期：2003-04-30 20:47:28
<br>内容：建议你找一本c++看看。typedef struct mystructtag<BR>{<BR>&nbsp;&nbsp; int&nbsp;&nbsp; i;<BR>&nbsp;&nbsp; float f;<BR>&nbsp;&nbsp; char&nbsp;&nbsp;c;<BR>} mystruct;<BR><BR>mystruct ms;&nbsp;&nbsp; // Equivalent to "struct mystructtag ms;"<BR><BR>typedef int (*funcptr)();&nbsp;&nbsp;// funcptr is synonym for "pointer<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //&nbsp;&nbsp;&nbsp;&nbsp;to function returning int"<BR><BR>funcptr table[10];&nbsp;&nbsp; // Equivalent to "int (*table[10])();"<BR>
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