subject_32014.htm

一些关于vc的问答

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序号：32014 发表者：bgcq 发表日期：2003-03-09 12:31:06
<br>主题：内存分配的问题
<br>内容：&nbsp;&nbsp;&nbsp;&nbsp;int i=0;<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;short* buffer1[MAX_COMPONENTS];<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;short*buffer = (short*)malloc(MAX_COMPONENTS * 2*64);<BR>&nbsp;&nbsp;&nbsp;&nbsp;for (i = 0; i &lt; 10; i++) <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;buffer1[i] =(short*)(buffer + i*64);<BR>&nbsp;&nbsp;&nbsp;&nbsp;for (i = 0; i &lt; 10; i++) <BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if(buffer1[i]!=NULL)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;delete buffer1[i];<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR><BR>我运行到i=1时delete buffer1[i];出现非法操作?什么原因?
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<font color=red>答案被接受</font><br>回复者：tjhe 回复日期：2003-03-09 13:25:36
<br>内容：//不能用下面的循环:<BR>for (i = 0; i &lt; 10; i++) <BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if(buffer1[i]!=NULL)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;delete buffer1[i];<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>因为buffer1[0]的值和buffer相同，delete buffer1[0]; 与delete buffer;效果相同，<BR>所以后面的delete buffer1[i];就非法操作（所指的内存已经被）delete buffer1[0]; 删掉了。<BR>
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