subject_26849.htm

一些关于vc的问答

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序号：26849 发表者：tianjin_chen 发表日期：2003-01-06 09:22:12
<br>主题：关于字符数组的!?高手帮我看看----在线等待!!
<br>内容：我下面这段程序,为什么运行结果m_DownMessage多于8个字符呢!是"84 62199 \zz"?<BR>void CDlgConsumer::OnConBtnSet() <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;CString m_DownMessage;<BR>&nbsp;&nbsp;&nbsp;&nbsp;char m_Dchar[7];<BR>&nbsp;&nbsp;&nbsp;&nbsp;DownMessage_char(1,m_Dchar);<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_DownMessage=m_Dchar;<BR>}<BR>DownMessage_char(int CodeID, char m_char[])<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;if(CodeID=1)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_char[0]='8';<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_char[1]='4';<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_char[2]=' ';<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_char[3]='6';<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_char[4]='2';<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_char[5]='1';<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_char[6]='9';<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_char[7]='9';<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR><BR>}<BR>
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<font color=red>答案被接受</font><br>回复者：mm2003 回复日期：2003-01-06 09:26:27
<br>内容：加上m_char[8]='\0'就可以了，字符串需要以‘\0’结尾<BR>
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回复者：tianjin_chen 回复日期：2003-01-06 09:35:09
<br>内容：谢谢mm2003!!!
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回复者：mm2003 回复日期：2003-01-06 10:30:33
<br>内容：怎么不给分呀！
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回复者：沐秋 回复日期：2003-01-06 21:48:13
<br>内容：void CDlgConsumer::OnConBtnSet() <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;CString m_DownMessage;<BR>&nbsp;&nbsp;&nbsp;&nbsp;char m_Dchar[7];//我想说这里数组大小为7，应该是从m_Dchar[0]到m_Dchar[6]7个元素<BR>&nbsp;&nbsp;&nbsp;&nbsp;DownMessage_char(1,m_Dchar);<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_DownMessage=m_Dchar;<BR>}<BR>DownMessage_char(int CodeID, char m_char[])<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;if(CodeID=1)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_char[0]='8';<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_char[1]='4';<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_char[2]=' ';<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_char[3]='6';<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_char[4]='2';<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_char[5]='1';<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_char[6]='9';<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_char[7]='9';//调用函数中函数大小是8个越界了，虽然c++对于数组的大小不检查是否out of&nbsp;&nbsp;rang ，但是程序大的时候可能会覆盖其他程序<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR><BR>}<BR><BR>实际上你的DownMessage_char(int CodeID, char m_char[])可作如下改变实现同样的功能<BR>void DownMessage_char(int CodeID, char *m_char)<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;if(CodeID=1)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;strcpy(m_char,"84 62199");//在头文件中加上#include "string.h";<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>}<BR>你试试看
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