线程1：EXC_BAD_ACCESS（代码= 2，地址= 0x8）错误c ++ [英] Thread 1: EXC_BAD_ACCESS ( code=2,address=0x8) Error c++

问题描述

我正在开发c ++应用程序。我已经分配内存，但在superfile.cpp中得到错误线程1：EXC_BAD_ACCESS（代码= 2，地址= 0x8）。这是我的代码：

I'm developing c++ application . I have allocated memory but im getting the Error Thread 1: EXC_BAD_ACCESS ( code=2,address=0x8) in superfile.cpp. Here is my code :

superfile.h

superfile.h

struct Node{
        Voxel   *data;
        Node    *next;
    };

superfile.cpp

int* cnt =(int*)calloc(_width*_height,sizeof(int));
    Voxel *temp =(Voxel *)calloc(_width*_height,sizeof(Voxel)); 
    Node *list=(Node *)calloc(_width*_height*2,sizeof(Node));

list[(_width*_height)+l].next = list[_width*yy + xx].next->next; // Thread 1: EXC_BAD_ACCESS ( code=2,address=0x8) Error c++

的变量是：

_width=60
_height=45
l=3
yy=4096
xx=-3345

有什么想法吗？谢谢

>

推荐答案

您分配的内存不够。这里， list 的大小是60 * 45 * 2 = 5400个元素。您正在尝试访问60 * 4096-3345 = 242415的元素。

You're allocating not enough memory. Here, the size of list is 60*45*2=5400 elements. You're trying to access the 60*4096-3345=242415th element.

这是访问不属于与 list 相关联的内存的内存。第242415个元素不存在。这是SegmentationFault。

That's access to memory that doesn't belong to the memory associated with list. The 242415th element doesn't exist. That's SegmentationFault.

您需要使用 calloc（_width * _height * 100，sizeof（...））; 来处理这个。然而，你会浪费大量的内存。

You'll need to use something like calloc(_width*_height*100,sizeof(...)); to handle this. However, you'll waste lots of memory then.

此外，不要为 next 和 next-> code>。尝试此

Also, you never allocate memory for next and next->next. Try this

list[_width*yy + xx].next=calloc(50, sizeof(...));
list[_width*yy + xx].next->next=calloc(50, sizeof(...));
list[(_width*_height)+l].next = list[_width*yy + xx].next->next;

这里 50 只是随机数不知道你的 struct 消耗了多少空间。

Here 50 is just random number, I'm not sure how much space does your struct consume.

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