[英]Memory Leak in Matlab MEX call despite freeing all dynamic memory?
[英]Memory leak despite freeing allocated memory
我有一个const char *,我需要用逗号分隔。 因为strtok会修改输入字符串,所以我会复制它,并在函数末尾释放已分配的内存。
void ApBuilder::addNetworkType(ApDbData::RowIterator &iter)
{
const char * type = iter.getColumnText(ApDbData::AP_IDX_TYPE_80211);
const size_t len = strlen(type);
char * temp = new char[len +1];
strncpy(temp, type, len);
temp[len] = '\0';
temp = strtok(temp, ",");
while(temp != NULL)
{
tmpObject.add(temp, true);
temp = strtok(NULL, ",");
}
jsonObject.add("type80211", tmpObject);
delete[] temp;
}
尽管我释放了分配的内存,但Valgrind抱怨说我有内存泄漏。 我该如何解决这个漏洞
==17667== 8 bytes in 2 blocks are definitely lost in loss record 1 of 4
==17667== at 0x402ADFC: operator new[](unsigned int) (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==17667== by 0x8049C5D: ApBuilder::addNetworkType(AbstractDbData::RowIterator&) (in /home/***/workspace/projects/jsonBuilder/main)
==17667== by 0x8049A38: ApBuilder::buildApArray() (in /home/***/workspace/projects/jsonBuilder/main)
==17667== by 0x8049679: main (in /home/***/workspace/projects/jsonBuilder/main)
strtok修改临时指针。 您需要删除原始指针值。 (为此目的将其保存在变量中。)
您需要将temp_ptr分配给strtok值。 每次重新分配temp时,都会丢弃临时字符串的开头。
tok_ptr = strtok(temp, ",");
while(tok_ptr != NULL)
{
//你可能想在最后一个tok_ptr和下一个tok_prt tmpObject.add(temp,true)之间添加子串;
tok_prt = strtok(NULL, ",");
}
ScottMcP-MVP表示,导致内存泄漏的问题非常严重。
避免这种泄漏的c ++方法是使用许多std帮助程序之一:auto_ptr / unique_ptr,vector。 为什么不是字符串?
std::string copy(iter.getColumnText(ApDbData::AP_IDX_TYPE_80211);
copy.append('\0');
char *temp = ©[0];
temp = strtok(temp, ",");
....
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