?? [c++對象模型][4]指針與字符串 - itech's blog - 博客園.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">總結：</SPAN></P>
<P><SPAN
style="COLOR: #ff0000">1）以mem開始的函數用來bytes的操作，所以需要指定長度，但是以str用來操作以\0結尾的字符串，不需要指定長度。</SPAN></P>
<P><SPAN
style="COLOR: #ff0000">2）對于unicode，相應的字符串操作函數前綴為wcs，例如wcscpy,wcscat,wcscmp，wcschr，wcsstr，wcstok等。</SPAN></P>
<P><SPAN
style="COLOR: #ff0000">3）在vc中還提供了有安全檢測的字符串函數后綴_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*如果指向常量區，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使用相當簡單哦！</P>
<P>四 完！</P>
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<P>感謝，Thanks！<BR><BR>作者：<A href="http://itech.cnblogs.com/">iTech</A><BR>出處：<A
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<BR>轉載：本文版權歸作者iTech所有，轉載請注明出處，不得用于商業用途！</P></DIV>
<DIV id=EntryTag>Tag標簽: <A
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<DIV class=postDesc>posted @ 2009-02-22 16:56 <A
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