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          <TD width="90%"><FONT face="Verdana, Arial, Helvetica" size=4><B>C 和 
            C++ 函數實現的比較</B></FONT></TD>
          <TD align=right width=200><FONT face="Verdana, Arial, Helvetica" 
            size=1><NOBR>第 12 頁（共16 
      頁）</NOBR></FONT></TD></TR></TBODY></TABLE><BR><BR></P><FONT 
      face="Verdana, Arial, Helvetica" size=2>
      <P>C 和 C++ 代碼幾乎相同；唯一的差異在于用來訪問 JNI 函數的方法。在 C 中，JNI 
      函數調用由“<CODE>(*env)-&gt;</CODE>”作前綴，目的是為了取出函數指針所引用的值。在 C++ 
      中，<CODE>JNIEnv</CODE> 
      類擁有處理函數指針查找的內聯成員函數。下面將說明這個細微的差異，其中，這兩行代碼訪問同一函數，但每種語言都有各自的語法。</P>
      <P>
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          <TD align=right width=100><B>C 語法：</B></TD>
          <TD width=375><CODE>jsize len = 
            (*env)-&gt;GetArrayLength(env,array);</CODE></TD></TR>
        <TR>
          <TD align=right width=100><B>C++ 語法：</B></TD>
          <TD width=375><CODE>jsize len 
          =env-&gt;GetArrayLength(array);</CODE></TD></TR></TBODY></TABLE></P><BR></FONT></TD></TR></TBODY></TABLE>
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