内存泄露输出

最新推荐文章于 2022-08-28 00:12:37 发布

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最新推荐文章于 2022-08-28 00:12:37 发布

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文章标签： windows vc 内存泄露调试

本文链接：https://blog.youkuaiyun.com/dhqcl/article/details/19840785

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vc程序在调试模式下,new分配的内存通过一个结构体CrtMemBlockHeader来形成双链表

typedef struct  CrtMemBlockHeader{	
	struct CrtMemBlockHeader *pBlockHeaderNext;		// Pointer to the block allocated just before this one:
	struct CrtMemBlockHeader *pBlockHeaderPrev;		// Pointer to the block allocated just after this one:
	char *szFileName;				// File name
	int nLine;						// Line number
	size_t nDataSize;				// Size of user block
	int nBlockUse;					// Type of block
	long lRequest;					// Allocation number
	unsigned char gap[4];			// nNoMansLandSize	// Buffer just before (lower than) the user's memory:
} CrtMemBlockHeader;

因而可以写一个在程序退出的时候输出没有释放的内存,即遍历该双链表,将代码行和文件名称打印出来

int* p = new  int;
CrtMemBlockHeader* phead = (CrtMemBlockHeader*)p;
phead--;
if(phead && phead->pBlockHeaderNext){
	phead = phead->pBlockHeaderNext;
	while (phead)
	{
		void* ptr = (void*)(phead+1);
		if(phead->nLine!=0)
		{
			DBGVIEW("dataSize:%6d line:%4d File:%s",
			phead->nDataSize,phead->nLine,phead->szFileName);
		}
		phead = phead->pBlockHeaderNext;
	}
	break;
}else{
	DBGVIEW("invalid header_ %x",phead);
}
delete p;