删除指针导致内存泄漏

delete pointer causes memory leak?

本文关键字：内存 泄漏 指针 删除      更新时间：2023-10-16

我正在使用运行时库CRT来检测内存泄漏。这是我在析构函数中发现的：

                    _CrtMemCheckpoint(&crtMemStateFinish);
nDifference = _CrtMemDifference(&crtMemStateDifference, &crtMemStateStart, &crtMemStateFinish);
sizeChange = crtMemStateFinish.lSizes - crtMemStateStart.lSizes;
if(nDifference > 0)
_CrtDumpMemoryLeaks();
nDifference = 0;
sizeChange = 0;
_CrtMemCheckpoint(&crtMemStateStart);

                delete[] ptr;
                ptr = NULL;
                    _CrtMemCheckpoint(&crtMemStateFinish);
nDifference = _CrtMemDifference(&crtMemStateDifference, &crtMemStateStart, &crtMemStateFinish);
sizeChange = crtMemStateFinish.lSizes - crtMemStateStart.lSizes;
if(nDifference > 0)
_CrtDumpMemoryLeaks();
nDifference = 0;
sizeChange = 0;
_CrtMemCheckpoint(&crtMemStateStart);

nDifference>0，所以存在内存泄漏，但它没有说明在哪里。

以下是ptr的声明和定义方式：

char ** ptr;
ptr = new char*[4];

有什么建议吗？

您正在分配一个指针数组。您不仅必须删除数组，还必须删除数组中的每个指针。显然，在删除数组之前，您需要执行操作。

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