1

编辑：为了清楚起见，这个问题是由我的代码中的拼写错误引起的，在

pointer = new BYTE(datasize);

本来应该

pointer = new BYTE[datasize];

一切都很好！

结尾

你好！

我在 C++ 项目中的 Visual Studio 2005 中遇到了一个奇怪的堆栈溢出问题。

在我的代码中，我有一个

BYTE* pointer;

该指针设置为NULL，然后分配一些内存，然后清除为0x00。像这样：

pointer = NULL;
pointer = new BYTE(dataSize);
memset(pointer,0x00,dataSize);

现在，我已经运行了几次，得到了两个不同的结果。有时（在程序的后面部分，当我用 delete[] 删除指针时）它说堆已损坏，然后检查调用堆栈似乎 _CrtIsValidHeapPointer 断言它不是一个有效的指针。但是我检查了这个指针，它对我来说似乎是有效的（它有一个内存地址）。我错过了什么吗？

在另一种情况下，应用程序冻结了很短的时间，并且我收到了堆栈溢出消息。当我检查调用堆栈时，它看起来像这样

 something.dll!_heap_alloc_base(unsigned int size=568)  Line 105 + 0x28 bytes   C
something.dll!_heap_alloc_dbg(unsigned int nSize=532, int nBlockUse=2, const char * szFileName=0x0627fec8, int nLine=608)  Line 411 + 0x9 bytes C++
something.dll!_nh_malloc_dbg(unsigned int nSize=532, int nhFlag=0, int nBlockUse=2, const char * szFileName=0x0627fec8, int nLine=608)  Line 268 + 0x15 bytes   C++
something.dll!_malloc_dbg(unsigned int nSize=532, int nBlockUse=2, const char * szFileName=0x0627fec8, int nLine=608)  Line 191 + 0x1b bytes    C++
something.dll!_calloc_dbg(unsigned int nNum=1, unsigned int nSize=532, int nBlockUse=2, const char * szFileName=0x0627fec8, int nLine=608)  Line 563 + 0x15 bytes   C++
something.dll!_getptd_noexit()  Line 608 + 0x18 bytes   C
something.dll!_errno()  Line 281 + 0x5 bytes    C
something.dll!_heap_alloc_dbg(unsigned int nSize=532, int nBlockUse=2, const char * szFileName=0x0627fec8, int nLine=608)  Line 415 + 0x5 bytes C++
something.dll!_nh_malloc_dbg(unsigned int nSize=532, int nhFlag=0, int nBlockUse=2, const char * szFileName=0x0627fec8, int nLine=608)  Line 268 + 0x15 bytes   C++
something.dll!_malloc_dbg(unsigned int nSize=532, int nBlockUse=2, const char * szFileName=0x0627fec8, int nLine=608)  Line 191 + 0x1b bytes    C++
something.dll!_calloc_dbg(unsigned int nNum=1, unsigned int nSize=532, int nBlockUse=2, const char * szFileName=0x0627fec8, int nLine=608)  Line 563 + 0x15 bytes   C++
something.dll!_getptd_noexit()  Line 608 + 0x18 bytes   C
something.dll!_errno()  Line 281 + 0x5 bytes    C
something.dll!_heap_alloc_dbg(unsigned int nSize=532, int nBlockUse=2, const char * szFileName=0x0627fec8, int nLine=608)  Line 415 + 0x5 bytes C++
something.dll!_nh_malloc_dbg(unsigned int nSize=532, int nhFlag=0, int nBlockUse=2, const char * szFileName=0x0627fec8, int nLine=608)  Line 268 + 0x15 bytes   C++
something.dll!_malloc_dbg(unsigned int nSize=532, int nBlockUse=2, const char * szFileName=0x0627fec8, int nLine=608)  Line 191 + 0x1b bytes    C++
something.dll!_calloc_dbg(unsigned int nNum=1, unsigned int nSize=532, int nBlockUse=2, const char * szFileName=0x0627fec8, int nLine=608)  Line 563 + 0x15 bytes   C++
something.dll!_getptd_noexit()  Line 608 + 0x18 bytes   C
something.dll!_errno()  Line 281 + 0x5 bytes    C
something.dll!_heap_alloc_dbg(unsigned int nSize=532, int nBlockUse=2, const char * szFileName=0x0627fec8, int nLine=608)  Line 415 + 0x5 bytes C++
something.dll!_nh_malloc_dbg(unsigned int nSize=532, int nhFlag=0, int nBlockUse=2, const char * szFileName=0x0627fec8, int nLine=608)  Line 268 + 0x15 bytes   C++
something.dll!_malloc_dbg(unsigned int nSize=532, int nBlockUse=2, const char * szFileName=0x0627fec8, int nLine=608)  Line 191 + 0x1b bytes    C++
something.dll!_calloc_dbg(unsigned int nNum=1, unsigned int nSize=532, int nBlockUse=2, const char * szFileName=0x0627fec8, int nLine=608)  Line 563 + 0x15 bytes   C++
something.dll!_getptd_noexit()  Line 608 + 0x18 bytes   C
something.dll!_errno()  Line 281 + 0x5 bytes    C

有很多这样的调用，我很确定这会导致堆栈溢出。知道这个问题可能是什么吗？我试图查看我是否分配/释放错误，但我没有写入除 memset 之外分配的内存块。

我分配/释放内存的方式有问题吗？

我正在使用此代码解除分配：

if (pointer != NULL){
    delete[] pointer;
    pointer = NULL;
}

这应该确保我没有释放已经释放的内存，对吗？

谢谢..

编辑：在输出窗口中，我也得到了这些：

First-chance exception at 0x76df0839 in app.exe: 0xC0000005: Access violation reading location 0xfffffff8.
First-chance exception at 0x76e2871f in app.exe: 0xC0000005: Access violation reading location 0x00000004.
First-chance exception at 0x76e00a65 in app.exe: 0xC0000005: Access violation reading location 0xfffffff8.
First-chance exception at 0x76e00a65 in app.exe: 0xC0000005: Access violation reading location 0xfffffff8.
First-chance exception at 0x76e00a65 in app.exe: 0xC0000005: Access violation reading location 0xfffffff8.
First-chance exception at 0x76e00a65 in app.exe: 0xC0000005: Access violation reading location 0xfffffff8.
First-chance exception at 0x76e00a65 in app.exe: 0xC0000005: Access violation reading location 0xfffffff8.
First-chance exception at 0x76e00a65 in app.exe: 0xC0000005: Access violation reading location 0xfffffff8.
First-chance exception at 0x76e00a65 in app.exe: 0xC0000005: Access violation reading location 0xfffffff8.
First-chance exception at 0x76e00a65 in app.exe: 0xC0000005: Access violation reading location 0xfffffff8.
First-chance exception at 0x76e00a65 in app.exe: 0xC0000005: Access violation reading location 0xfffffff8.
First-chance exception at 0x76e00a65 in app.exe: 0xC0000005: Access violation reading location 0xfffffff8.
First-chance exception at 0x76e00a65 in app.exe: 0xC0000005: Access violation reading location 0xfffffff8.
First-chance exception at 0x76e00a65 in app.exe: 0xC0000005: Access violation reading location 0xfffffff8.
4

2 回答 2

6

我想你的意思是：

pointer = new BYTE[size];
于 2009-09-14T01:59:22.397 回答
0

您的取消分配代码应为：

if (pointer != NULL){
    delete[] pointer;
    pointer = NULL;
}
于 2009-09-14T02:03:32.517 回答