📄 [c++对象模型][4]指针与字符串 - itech's blog - 博客园.htm
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style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #000000">; </SPAN><SPAN
style="COLOR: #008000">//</SPAN><SPAN
style="COLOR: #008000"> 123456789\0</SPAN><SPAN
style="COLOR: #008000"><BR></SPAN><SPAN
style="COLOR: #000000"> strcpy(</SPAN><SPAN
style="COLOR: #0000ff">string</SPAN><SPAN
style="COLOR: #000000">, str1);<BR><BR> strcat(</SPAN><SPAN
style="COLOR: #0000ff">string</SPAN><SPAN style="COLOR: #000000">,</SPAN><SPAN
style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #800000">A</SPAN><SPAN
style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #000000">); </SPAN><SPAN
style="COLOR: #008000">//</SPAN><SPAN
style="COLOR: #008000">123456789A\0</SPAN><SPAN
style="COLOR: #008000"><BR></SPAN><SPAN
style="COLOR: #000000"><BR> </SPAN><SPAN
style="COLOR: #0000ff">int</SPAN><SPAN
style="COLOR: #000000"> r </SPAN><SPAN
style="COLOR: #000000">=</SPAN><SPAN
style="COLOR: #000000"> strcmp(</SPAN><SPAN
style="COLOR: #0000ff">string</SPAN><SPAN style="COLOR: #000000">,</SPAN><SPAN
style="COLOR: #800000">"</SPAN><SPAN
style="COLOR: #800000">123456789B</SPAN><SPAN
style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #000000">); </SPAN><SPAN
style="COLOR: #008000">//</SPAN><SPAN
style="COLOR: #008000"> 123456789A\0 < 123456789B\0</SPAN><SPAN
style="COLOR: #008000"><BR></SPAN><SPAN
style="COLOR: #000000">}<BR><BR></SPAN><SPAN
style="COLOR: #0000ff">void</SPAN><SPAN
style="COLOR: #000000"> TestStrFunction2()<BR>{<BR> </SPAN><SPAN
style="COLOR: #0000ff">int</SPAN><SPAN
style="COLOR: #000000"> ch </SPAN><SPAN
style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN
style="COLOR: #800000">'</SPAN><SPAN style="COLOR: #800000">r</SPAN><SPAN
style="COLOR: #800000">'</SPAN><SPAN
style="COLOR: #000000">;<BR> </SPAN><SPAN
style="COLOR: #0000ff">char</SPAN><SPAN
style="COLOR: #000000"> </SPAN><SPAN
style="COLOR: #0000ff">string</SPAN><SPAN
style="COLOR: #000000">[] </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN
style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN
style="COLOR: #800000">The quick # brown dog # jumps over # the lazy fox</SPAN><SPAN
style="COLOR: #800000">"</SPAN><SPAN
style="COLOR: #000000">;<BR> </SPAN><SPAN
style="COLOR: #0000ff">char</SPAN><SPAN
style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #000000">*</SPAN><SPAN
style="COLOR: #000000">pdest </SPAN><SPAN
style="COLOR: #000000">=</SPAN><SPAN
style="COLOR: #000000"> NULL;<BR> pdest </SPAN><SPAN
style="COLOR: #000000">=</SPAN><SPAN
style="COLOR: #000000"> strchr( </SPAN><SPAN
style="COLOR: #0000ff">string</SPAN><SPAN
style="COLOR: #000000">, ch );<BR><BR> pdest </SPAN><SPAN
style="COLOR: #000000">=</SPAN><SPAN
style="COLOR: #000000"> NULL;<BR> </SPAN><SPAN
style="COLOR: #0000ff">char</SPAN><SPAN
style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #000000">*</SPAN><SPAN
style="COLOR: #000000"> str </SPAN><SPAN
style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN
style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #800000">dog</SPAN><SPAN
style="COLOR: #800000">"</SPAN><SPAN
style="COLOR: #000000">;<BR> pdest </SPAN><SPAN
style="COLOR: #000000">=</SPAN><SPAN
style="COLOR: #000000"> strstr(</SPAN><SPAN
style="COLOR: #0000ff">string</SPAN><SPAN
style="COLOR: #000000">,str);<BR><BR> pdest </SPAN><SPAN
style="COLOR: #000000">=</SPAN><SPAN
style="COLOR: #000000"> NULL;<BR> </SPAN><SPAN
style="COLOR: #0000ff">char</SPAN><SPAN
style="COLOR: #000000"> delims[] </SPAN><SPAN
style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN
style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #800000">#</SPAN><SPAN
style="COLOR: #800000">"</SPAN><SPAN
style="COLOR: #000000">;<BR> pdest </SPAN><SPAN
style="COLOR: #000000">=</SPAN><SPAN
style="COLOR: #000000"> strtok( </SPAN><SPAN
style="COLOR: #0000ff">string</SPAN><SPAN
style="COLOR: #000000">, delims );<BR> </SPAN><SPAN
style="COLOR: #0000ff">while</SPAN><SPAN
style="COLOR: #000000">( pdest </SPAN><SPAN
style="COLOR: #000000">!=</SPAN><SPAN
style="COLOR: #000000"> NULL ) <BR> {<BR> pdest </SPAN><SPAN
style="COLOR: #000000">=</SPAN><SPAN
style="COLOR: #000000"> strtok( NULL, delims );<BR> }<BR>}</SPAN></SPAN></DIV>
<P> </P>
<P><SPAN style="COLOR: #ff0000">总结：</SPAN></P>
<P><SPAN
style="COLOR: #ff0000">1）以mem开始的函数用来bytes的操作，所以需要指定长度，但是以str用来操作以\0结尾的字符串，不需要指定长度。</SPAN></P>
<P><SPAN
style="COLOR: #ff0000">2）对于unicode，相应的字符串操作函数前缀为wcs，例如wcscpy,wcscat,wcscmp，wcschr，wcsstr，wcstok等。</SPAN></P>
<P><SPAN
style="COLOR: #ff0000">3）在vc中还提供了有安全检测的字符串函数后缀_s,例如strcpy_s,strcat_s,strcmp_s,wcscpy_s,wcscat_s,wcscmp_s等。</SPAN></P>
<P><SPAN style="COLOR: #ff0000">4）char*如果指向常量区，不能被修改，且此char*不需要delete。例如 char*
pStr = "ABC";。</SPAN></P>
<P>三 std::string和std::wstring使用相当简单哦！</P>
<P>四 完！</P>
<DIV id=MySignature>
<P>感谢，Thanks！<BR><BR>作者：<A href="http://itech.cnblogs.com/">iTech</A><BR>出处：<A
href="http://itech.cnblogs.com/">http://itech.cnblogs.com/</A>
<BR>转载：本文版权归作者iTech所有，转载请注明出处，不得用于商业用途！</P></DIV>
<DIV id=EntryTag>Tag标签: <A
href="http://www.cnblogs.com/itech/tag/[Cpp对象模å]/">[Cpp对象模型]</A></DIV></DIV>
<DIV class=postDesc>posted @ 2009-02-22 16:56 <A
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