subject_35040.htm

一些关于vc的问答

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序号：35040 发表者：很冷 发表日期：2003-04-03 17:39:45
<br>主题：怎样比较char[]数组的内容？以下语句错在哪里？
<br>内容：char cdtest[40];<BR>&nbsp;&nbsp;&nbsp;&nbsp;mciSendString("info cdaudio product",cdtest,40,NULL);<BR>&nbsp;&nbsp;&nbsp;&nbsp;sysinfo.cdrom[0]=0;<BR>&nbsp;&nbsp;&nbsp;&nbsp;if (cdtest=="CD 音频")<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; strcat(sysinfo.cdrom,"有");<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;else<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; strcat(sysinfo.cdrom,"无");<BR>&nbsp;&nbsp;&nbsp;&nbsp;}
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回复者：victor 回复日期：2003-04-03 17:50:31
<br>内容：用strcmp
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回复者：ohye212 回复日期：2003-04-03 17:52:34
<br>内容：if (cdtest=="CD 音频")&nbsp;&nbsp;&nbsp;&nbsp;//////////改为<BR><BR>if(strcmp(cdtest,"CD 音频")==0 )<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; strcat(sysinfo.cdrom,"有");<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;else<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; strcat(sysinfo.cdrom,"无");<BR>&nbsp;&nbsp;&nbsp;&nbsp;} <BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;
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回复者：TheCold 回复日期：2003-04-03 17:54:52
<br>内容：if (cdtest=="CD 音频") //不要用逻辑符比较，用一个标准库函数 strmp(....)<BR>////////////////////////////////////////////////<BR>int result = strcmp( cdtest,"CD 音频")<BR>if (result == 0)<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;strcat(sysinfo.cdrom,"有");<BR>}<BR>else<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;strcat(sysinfo.cdrom,"无");<BR>}<BR><BR>///////////////////////////////////////////////<BR>
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回复者：很冷 回复日期：2003-04-03 23:09:07
<br>内容：感谢大家的帮助<BR>三楼的老兄，为什么不能进行逻辑比较？<BR>用debug观察，cdtest 的值就是“CD 音频”
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回复者：ohye212 回复日期：2003-04-04 09:04:36
<br>内容：你真的想比较的话<BR>cstring was=cdtest;<BR><BR>if (was=="CD 音频")<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; strcat(sysinfo.cdrom,"有");<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;else<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; strcat(sysinfo.cdrom,"无");<BR>&nbsp;&nbsp;&nbsp;&nbsp;} <BR>
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<font color=red>答案被接受</font><br>回复者：wowow 回复日期：2003-04-04 10:51:33
<br>内容："=="比较的是地址，"strcmp"比较的是内容
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